/**************************************************************************** ** ** Implementation of QWidget class ** ** Created : 931031 ** ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the kernel module of the Qt GUI Toolkit. ** ** This file may be used under the terms of the GNU General ** Public License versions 2.0 or 3.0 as published by the Free ** Software Foundation and appearing in the files LICENSE.GPL2 ** and LICENSE.GPL3 included in the packaging of this file. ** Alternatively you may (at your option) use any later version ** of the GNU General Public License if such license has been ** publicly approved by Trolltech ASA (or its successors, if any) ** and the KDE Free Qt Foundation. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** This file may be used under the terms of the Q Public License as ** defined by Trolltech ASA and appearing in the file LICENSE.QPL ** included in the packaging of this file. Licensees holding valid Qt ** Commercial licenses may use this file in accordance with the Qt ** Commercial License Agreement provided with the Software. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted ** herein. ** **********************************************************************/ #include "qobjectlist.h" #include "qwidget.h" #include "qwidgetlist.h" #include "qwidgetintdict.h" #include "qptrdict.h" #include "qfocusdata.h" #include "qcursor.h" #include "qpixmap.h" #include "qapplication.h" #include "qapplication_p.h" #include "qbrush.h" #include "qlayout.h" #include "qstylefactory.h" #include "qcleanuphandler.h" #include "qstyle.h" #include "qmetaobject.h" #include "qguardedptr.h" #if defined(QT_ACCESSIBILITY_SUPPORT) #include "qaccessible.h" #endif #if defined(Q_WS_WIN) #include "qt_windows.h" #include "qinputcontext_p.h" #endif #if defined(Q_WS_QWS) #include "qwsmanager_qws.h" #endif #include "qfontdata_p.h" /*! \class QWidget qwidget.h \brief The QWidget class is the base class of all user interface objects. \ingroup abstractwidgets \mainclass The widget is the atom of the user interface: it receives mouse, keyboard and other events from the window system, and paints a representation of itself on the screen. Every widget is rectangular, and they are sorted in a Z-order. A widget is clipped by its parent and by the widgets in front of it. A widget that isn't embedded in a parent widget is called a top-level widget. Usually, top-level widgets are windows with a frame and a title bar (although it is also possible to create top-level widgets without such decoration if suitable widget flags are used). In Qt, QMainWindow and the various subclasses of QDialog are the most common top-level windows. A widget without a parent widget is always a top-level widget. Non-top-level widgets are child widgets. These are child windows in their parent widgets. You cannot usually distinguish a child widget from its parent visually. Most other widgets in Qt are useful only as child widgets. (It is possible to make, say, a button into a top-level widget, but most people prefer to put their buttons inside other widgets, e.g. QDialog.) If you want to use a QWidget to hold child widgets you will probably want to add a layout to the parent QWidget. (See \link layout.html Layouts\endlink.) QWidget has many member functions, but some of them have little direct functionality: for example, QWidget has a font property, but never uses this itself. There are many subclasses which provide real functionality, such as QPushButton, QListBox and QTabDialog, etc. \section1 Groups of functions: \table \header \i Context \i Functions \row \i Window functions \i show(), hide(), raise(), lower(), close(). \row \i Top level windows \i caption(), setCaption(), icon(), setIcon(), iconText(), setIconText(), isActiveWindow(), setActiveWindow(), showMinimized(). showMaximized(), showFullScreen(), showNormal(). \row \i Window contents \i update(), repaint(), erase(), scroll(), updateMask(). \row \i Geometry \i pos(), size(), rect(), x(), y(), width(), height(), sizePolicy(), setSizePolicy(), sizeHint(), updateGeometry(), layout(), move(), resize(), setGeometry(), frameGeometry(), geometry(), childrenRect(), adjustSize(), mapFromGlobal(), mapFromParent() mapToGlobal(), mapToParent(), maximumSize(), minimumSize(), sizeIncrement(), setMaximumSize(), setMinimumSize(), setSizeIncrement(), setBaseSize(), setFixedSize() \row \i Mode \i isVisible(), isVisibleTo(), isMinimized(), isDesktop(), isEnabled(), isEnabledTo(), isModal(), isPopup(), isTopLevel(), setEnabled(), hasMouseTracking(), setMouseTracking(), isUpdatesEnabled(), setUpdatesEnabled(), clipRegion(). \row \i Look and feel \i style(), setStyle(), cursor(), setCursor() font(), setFont(), palette(), setPalette(), backgroundMode(), setBackgroundMode(), colorGroup(), fontMetrics(), fontInfo(). \row \i Keyboard focus<br>functions \i isFocusEnabled(), setFocusPolicy(), focusPolicy(), hasFocus(), setFocus(), clearFocus(), setTabOrder(), setFocusProxy(). \row \i Mouse and<br>keyboard grabbing \i grabMouse(), releaseMouse(), grabKeyboard(), releaseKeyboard(), mouseGrabber(), keyboardGrabber(). \row \i Event handlers \i event(), mousePressEvent(), mouseReleaseEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), keyPressEvent(), keyReleaseEvent(), focusInEvent(), focusOutEvent(), wheelEvent(), enterEvent(), leaveEvent(), paintEvent(), moveEvent(), resizeEvent(), closeEvent(), dragEnterEvent(), dragMoveEvent(), dragLeaveEvent(), dropEvent(), childEvent(), showEvent(), hideEvent(), customEvent(). \row \i Change handlers \i enabledChange(), fontChange(), paletteChange(), styleChange(), windowActivationChange(). \row \i System functions \i parentWidget(), topLevelWidget(), reparent(), polish(), winId(), find(), metric(). \row \i What's this help \i customWhatsThis() \row \i Internal kernel<br>functions \i focusNextPrevChild(), wmapper(), clearWFlags(), getWFlags(), setWFlags(), testWFlags(). \endtable Every widget's constructor accepts two or three standard arguments: \list 1 \i \c{QWidget *parent = 0} is the parent of the new widget. If it is 0 (the default), the new widget will be a top-level window. If not, it will be a child of \e parent, and be constrained by \e parent's geometry (unless you specify \c WType_TopLevel as widget flag). \i \c{const char *name = 0} is the widget name of the new widget. You can access it using name(). The widget name is little used by programmers but is quite useful with GUI builders such as \e{Qt Designer} (you can name a widget in \e{Qt Designer}, and connect() to it using the name in your code). The dumpObjectTree() debugging function also uses it. \i \c{WFlags f = 0} (where available) sets the widget flags; the default is suitable for almost all widgets, but to get, for example, a top-level widget without a window system frame, you must use special flags. \endlist The tictac/tictac.cpp example program is good example of a simple widget. It contains a few event handlers (as all widgets must), a few custom routines that are specific to it (as all useful widgets do), and has a few children and connections. Everything it does is done in response to an event: this is by far the most common way to design GUI applications. You will need to supply the content for your widgets yourself, but here is a brief run-down of the events, starting with the most common ones: \list \i paintEvent() - called whenever the widget needs to be repainted. Every widget which displays output must implement it, and it is wise \e not to paint on the screen outside paintEvent(). \i resizeEvent() - called when the widget has been resized. \i mousePressEvent() - called when a mouse button is pressed. There are six mouse-related events, but the mouse press and mouse release events are by far the most important. A widget receives mouse press events when the mouse is inside it, or when it has grabbed the mouse using grabMouse(). \i mouseReleaseEvent() - called when a mouse button is released. A widget receives mouse release events when it has received the corresponding mouse press event. This means that if the user presses the mouse inside \e your widget, then drags the mouse to somewhere else, then releases, \e your widget receives the release event. There is one exception: if a popup menu appears while the mouse button is held down, this popup immediately steals the mouse events. \i mouseDoubleClickEvent() - not quite as obvious as it might seem. If the user double-clicks, the widget receives a mouse press event (perhaps a mouse move event or two if they don't hold the mouse quite steady), a mouse release event and finally this event. It is \e{not possible} to distinguish a click from a double click until you've seen whether the second click arrives. (This is one reason why most GUI books recommend that double clicks be an extension of single clicks, rather than trigger a different action.) \endlist If your widget only contains child widgets, you probably do not need to implement any event handlers. If you want to detect a mouse click in a child widget call the child's hasMouse() function inside the parent widget's mousePressEvent(). Widgets that accept keyboard input need to reimplement a few more event handlers: \list \i keyPressEvent() - called whenever a key is pressed, and again when a key has been held down long enough for it to auto-repeat. Note that the Tab and Shift+Tab keys are only passed to the widget if they are not used by the focus-change mechanisms. To force those keys to be processed by your widget, you must reimplement QWidget::event(). \i focusInEvent() - called when the widget gains keyboard focus (assuming you have called setFocusPolicy()). Well written widgets indicate that they own the keyboard focus in a clear but discreet way. \i focusOutEvent() - called when the widget loses keyboard focus. \endlist Some widgets will also need to reimplement some of the less common event handlers: \list \i mouseMoveEvent() - called whenever the mouse moves while a button is held down. This is useful for, for example, dragging. If you call setMouseTracking(TRUE), you get mouse move events even when no buttons are held down. (Note that applications which make use of mouse tracking are often not very useful on low-bandwidth X connections.) (See also the \link dnd.html drag and drop\endlink information.) \i keyReleaseEvent() - called whenever a key is released, and also while it is held down if the key is auto-repeating. In that case the widget receives a key release event and immediately a key press event for every repeat. Note that the Tab and Shift+Tab keys are only passed to the widget if they are not used by the focus-change mechanisms. To force those keys to be processed by your widget, you must reimplement QWidget::event(). \i wheelEvent() -- called whenever the user turns the mouse wheel while the widget has the focus. \i enterEvent() - called when the mouse enters the widget's screen space. (This excludes screen space owned by any children of the widget.) \i leaveEvent() - called when the mouse leaves the widget's screen space. \i moveEvent() - called when the widget has been moved relative to its parent. \i closeEvent() - called when the user closes the widget (or when close() is called). \endlist There are also some rather obscure events. They are listed in \c qevent.h and you need to reimplement event() to handle them. The default implementation of event() handles Tab and Shift+Tab (to move the keyboard focus), and passes on most other events to one of the more specialized handlers above. When implementing a widget, there are a few more things to consider. \list \i In the constructor, be sure to set up your member variables early on, before there's any chance that you might receive an event. \i It is almost always useful to reimplement sizeHint() and to set the correct size policy with setSizePolicy(), so users of your class can set up layout management more easily. A size policy lets you supply good defaults for the layout management handling, so that other widgets can contain and manage yours easily. sizeHint() indicates a "good" size for the widget. \i If your widget is a top-level window, setCaption() and setIcon() set the title bar and icon respectively. \endlist \sa QEvent, QPainter, QGridLayout, QBoxLayout */ /***************************************************************************** Internal QWidgetMapper class The purpose of this class is to map widget identifiers to QWidget objects. All QWidget objects register themselves in the QWidgetMapper when they get an identifier. Widgets unregister themselves when they change ident- ifier or when they are destroyed. A widget identifier is really a window handle. The widget mapper is created and destroyed by the main application routines in the file qapp_xxx.cpp. *****************************************************************************/ #if defined(Q_WS_QWS) || defined(Q_OS_TEMP) static const int WDictSize = 163; // plenty for small devices #else static const int WDictSize = 1123; // plenty for 5 big complex windows #endif class QWidgetMapper : public QWidgetIntDict { // maps ids -> widgets public: QWidgetMapper(); ~QWidgetMapper(); QWidget *find( WId id ); // find widget void insert( const QWidget * ); // insert widget bool remove( WId id ); // remove widget private: WId cur_id; QWidget *cur_widget; }; QWidgetMapper *QWidget::mapper = 0; // app global widget mapper QWidgetMapper::QWidgetMapper() : QWidgetIntDict(WDictSize) { cur_id = 0; cur_widget = 0; } QWidgetMapper::~QWidgetMapper() { clear(); } inline QWidget *QWidgetMapper::find( WId id ) { if ( id != cur_id ) { // need to lookup cur_widget = QWidgetIntDict::find((long)id); if ( cur_widget ) cur_id = id; else cur_id = 0; } return cur_widget; } inline void QWidgetMapper::insert( const QWidget *widget ) { QWidgetIntDict::insert((long)widget->winId(),widget); } inline bool QWidgetMapper::remove( WId id ) { if ( cur_id == id ) { // reset current widget cur_id = 0; cur_widget = 0; } return QWidgetIntDict::remove((long)id); } /***************************************************************************** QWidget utility functions *****************************************************************************/ static QFont qt_naturalWidgetFont( QWidget* w ) { QFont naturalfont = QApplication::font( w ); if ( ! w->isTopLevel() ) { if ( ! naturalfont.isCopyOf( QApplication::font() ) ) naturalfont = naturalfont.resolve( w->parentWidget()->font() ); else naturalfont = w->parentWidget()->font(); } return naturalfont; } #ifndef QT_NO_PALETTE static QPalette qt_naturalWidgetPalette( QWidget* w ) { QPalette naturalpalette = QApplication::palette( w ); if ( !w->isTopLevel() && naturalpalette.isCopyOf( QApplication::palette() ) ) naturalpalette = w->parentWidget()->palette(); return naturalpalette; } #endif QSize qt_naturalWidgetSize( QWidget *w ) { QSize s = w->sizeHint(); QSizePolicy::ExpandData exp; #ifndef QT_NO_LAYOUT if ( w->layout() ) { if ( w->layout()->hasHeightForWidth() ) s.setHeight( w->layout()->totalHeightForWidth( s.width() ) ); exp = w->layout()->expanding(); } else #endif { if ( w->sizePolicy().hasHeightForWidth() ) s.setHeight( w->heightForWidth( s.width() ) ); exp = w->sizePolicy().expanding(); } if ( exp & QSizePolicy::Horizontally ) s.setWidth( QMAX( s.width(), 200 ) ); if ( exp & QSizePolicy::Vertically ) s.setHeight( QMAX( s.height(), 150 ) ); #if defined(Q_WS_X11) QRect screen = QApplication::desktop()->screenGeometry( w->x11Screen() ); #else // all others QRect screen = QApplication::desktop()->screenGeometry( w->pos() ); #endif s.setWidth( QMIN( s.width(), screen.width()*2/3 ) ); s.setHeight( QMIN( s.height(), screen.height()*2/3 ) ); return s; } /***************************************************************************** QWidget member functions *****************************************************************************/ /* Widget state flags: \list \i WState_Created The widget has a valid winId(). \i WState_Disabled The widget does not receive any mouse or keyboard events. \i WState_ForceDisabled The widget is explicitly disabled, i.e. it will remain disabled even when all its ancestors are set to the enabled state. This implies WState_Disabled. \i WState_Visible The widget is currently visible. \i WState_ForceHide The widget is explicitly hidden, i.e. it won't become visible unless you call show() on it. WState_ForceHide implies !WState_Visible. \i WState_OwnCursor A cursor has been set for this widget. \i WState_MouseTracking Mouse tracking is enabled. \i WState_CompressKeys Compress keyboard events. \i WState_BlockUpdates Repaints and updates are disabled. \i WState_InPaintEvent Currently processing a paint event. \i WState_Reparented The widget has been reparented. \i WState_ConfigPending A configuration (resize/move) event is pending. \i WState_Resized The widget has been resized. \i WState_AutoMask The widget has an automatic mask, see setAutoMask(). \i WState_Polished The widget has been "polished" (i.e. late initialization) by a QStyle. \i WState_DND The widget supports drag and drop, see setAcceptDrops(). \i WState_Exposed the widget was finally exposed (X11 only, helps avoid paint event doubling). \i WState_HasMouse The widget is under the mouse cursor. \endlist */ /*! \enum Qt::WFlags \internal */ /*! \enum Qt::WState \internal */ /*! \enum Qt::WidgetFlags \keyword widget flag This enum type is used to specify various window-system properties for the widget. They are fairly unusual but necessary in a few cases. Some of these flags depend on whether the underlying window manager supports them. (See the \link toplevel-example.html toplevel example\endlink for an explanation and example of their use.) The main types are \value WType_TopLevel indicates that this widget is a top-level widget, usually with a window-system frame and so on. \value WType_Dialog indicates that this widget is a top-level window that should be decorated as a dialog (i.e. typically no maximize or minimize buttons in the title bar). If you want to use it as a modal dialog it should be launched from another window, or have a parent and this flag should be combined with \c WShowModal. If you make it modal, the dialog will prevent other top-level windows in the application from getting any input. \c WType_Dialog implies \c WType_TopLevel. We refer to a top-level window that has a parent as a \e secondary window. (See also \c WGroupLeader.) \value WType_Popup indicates that this widget is a popup top-level window, i.e. that it is modal, but has a window system frame appropriate for popup menus. \c WType_Popup implies WType_TopLevel. \value WType_Desktop indicates that this widget is the desktop. See also \c WPaintDesktop below. \c WType_Desktop implies \c WType_TopLevel. There are also a number of flags which you can use to customize the appearance of top-level windows. These have no effect on other windows: \value WStyle_Customize indicates that the \c WStyle_* flags should be used to build the window instead of the default flags. \value WStyle_NormalBorder gives the window a normal border. This cannot be combined with \c WStyle_DialogBorder or \c WStyle_NoBorder. \value WStyle_DialogBorder gives the window a thin dialog border. This cannot be combined with \c WStyle_NormalBorder or \c WStyle_NoBorder. \value WStyle_NoBorder produces a borderless window. Note that the user cannot move or resize a borderless window via the window system. This cannot be combined with \c WStyle_NormalBorder or \c WStyle_DialogBorder. On Windows, the flag works fine. On X11, the result of the flag is dependent on the window manager and its ability to understand MOTIF and/or NETWM hints: most existing modern window managers can handle this. With \c WX11BypassWM, you can bypass the window manager completely. This results in a borderless window that is not managed at all (i.e. no keyboard input unless you call setActiveWindow() manually). \value WStyle_NoBorderEx this value is obsolete. It has the same effect as using \c WStyle_NoBorder. \value WStyle_Title gives the window a title bar. \value WStyle_SysMenu adds a window system menu. \value WStyle_Minimize adds a minimize button. Note that on Windows this has to be combined with \c WStyle_SysMenu for it to work. \value WStyle_Maximize adds a maximize button. Note that on Windows this has to be combined with \c WStyle_SysMenu for it to work. \value WStyle_MinMax is equal to \c WStyle_Minimize|WStyle_Maximize. Note that on Windows this has to be combined with \c WStyle_SysMenu to work. \value WStyle_ContextHelp adds a context help button to dialogs. \value WStyle_Tool makes the window a tool window. A tool window is often a small window with a smaller than usual title bar and decoration, typically used for collections of tool buttons. It there is a parent, the tool window will always be kept on top of it. If there isn't a parent, you may consider passing \c WStyle_StaysOnTop as well. If the window system supports it, a tool window can be decorated with a somewhat lighter frame. It can also be combined with \c WStyle_NoBorder. \value WStyle_StaysOnTop informs the window system that the window should stay on top of all other windows. Note that on some window managers on X11 you also have to pass \c WX11BypassWM for this flag to work correctly. \value WStyle_Dialog indicates that the window is a logical subwindow of its parent (i.e. a dialog). The window will not get its own taskbar entry and will be kept on top of its parent by the window system. Usually it will also be minimized when the parent is minimized. If not customized, the window is decorated with a slightly simpler title bar. This is the flag QDialog uses. \value WStyle_Splash indicates that the window is a splash screen. On X11, we try to follow NETWM standard for a splash screen window if the window manager supports is otherwise it is equivalent to \c WX11BypassWM. On other platforms, it is equivalent to \c WStyle_NoBorder \c | \c WMacNoSheet \c | \c WStyle_Tool \c | \c WWinOwnDC Modifier flags: \value WDestructiveClose makes Qt delete this widget when the widget has accepted closeEvent(), or when the widget tried to ignore closeEvent() but could not. \value WPaintDesktop gives this widget paint events for the desktop. \value WPaintUnclipped makes all painters operating on this widget unclipped. Children of this widget or other widgets in front of it do not clip the area the painter can paint on. \value WPaintClever indicates that Qt should \e not try to optimize repainting for the widget, but instead pass on window system repaint events directly. (This tends to produce more events and smaller repaint regions.) \value WMouseNoMask indicates that even if the widget has a mask, it wants mouse events for its entire rectangle. \value WStaticContents indicates that the widget contents are north-west aligned and static. On resize, such a widget will receive paint events only for the newly visible part of itself. \value WNoAutoErase indicates that the widget paints all its pixels. Updating, resizing, scrolling and focus changes should therefore not erase the widget. This allows smart-repainting to avoid flicker. \value WResizeNoErase this value is obsolete; use WNoAutoErase instead. \value WRepaintNoErase this value is obsolete; use WNoAutoErase instead. \value WGroupLeader makes this window a group leader. A group leader should \e not have a parent (i.e. it should be a top-level window). Any decendant windows (direct or indirect) of a group leader are in its group; other windows are not. If you show a secondary window from the group (i.e. show a window whose top-most parent is a group leader), that window will be modal with respect to the other windows in the group, but modeless with respect to windows in other groups. Miscellaneous flags \value WShowModal see WType_Dialog Internal flags. \value WNoMousePropagation \value WStaticContents \value WStyle_Reserved \value WSubWindow \value WType_Modal \value WWinOwnDC \value WX11BypassWM \value WMacNoSheet \value WMacDrawer \value WStyle_Mask \value WType_Mask */ /*! \enum Qt::NETWMFlags \keyword NETWM flag This enum type is used to specify various NETWM properties under X11 and similar systems. The main types are \value WX11DisableMove \value WX11DisableClose \value WX11DisableResize \value WX11DisableMinimize \value WX11DisableMaximize \value WX11DisableShade */ /*! \enum Qt::WidgetState Internal flags. \value WState_Created \value WState_Disabled \value WState_Visible \value WState_ForceHide \value WState_OwnCursor \value WState_MouseTracking \value WState_CompressKeys \value WState_BlockUpdates \value WState_InPaintEvent \value WState_Reparented \value WState_ConfigPending \value WState_Resized \value WState_AutoMask \value WState_Polished \value WState_DND \value WState_Reserved0 \e internal \value WState_CreatedHidden \value WState_Maximized \value WState_Minimized \value WState_ForceDisabled \value WState_Exposed \value WState_HasMouse \value WState_CreatedHidden \value WState_OwnSizePolicy \value WState_FullScreen */ /*! \enum Qt::WindowState \keyword window state This enum type is used to specify the current state of a top-level window. The states are \value WindowNoState The window has no state set (in normal state). \value WindowMinimized The window is minimized (i.e. iconified). \value WindowMaximized The window is maximized with a frame around it. \value WindowFullScreen The window fills the entire screen without any frame around it. \value WindowActive The window is the active window, i.e. it has keyboard focus. */ /*! Constructs a widget which is a child of \a parent, with the name \a name, widget flags set to \a f, and NETWM flags set to \a n. If \a parent is 0, the new widget becomes a top-level window. If \a parent is another widget, this widget becomes a child window inside \a parent. The new widget is deleted when its \a parent is deleted. The \a name is sent to the QObject constructor. The widget flags argument, \a f, is normally 0, but it can be set to customize the window frame of a top-level widget (i.e. \a parent must be 0). To customize the frame, set the \c WStyle_Customize flag OR'ed with any of the \l Qt::WidgetFlags. If you add a child widget to an already visible widget you must explicitly show the child to make it visible. Note that the X11 version of Qt may not be able to deliver all combinations of style flags on all systems. This is because on X11, Qt can only ask the window manager, and the window manager can override the application's settings. On Windows, Qt can set whatever flags you want. Example: \code QLabel *splashScreen = new QLabel( 0, "mySplashScreen", WStyle_Customize | WStyle_Splash ); \endcode */ QWidget::QWidget( QWidget *parent, const char *name, WFlags f, NFlags n ) : QObject( parent, name ), QPaintDevice( QInternal::Widget ) { #if defined(QT_CHECK_STATE) && !defined(Q_WS_WIN) if ( qApp->type() == QApplication::Tty ) { qWarning( "QWidget: Cannot create a QWidget when no GUI " "is being used" ); } #endif fstrut_dirty = 1; isWidget = TRUE; // is a widget winid = 0; // default attributes widget_state = 0; widget_flags = f; netwm_flags = n; focus_policy = 0; own_font = 0; own_palette = 0; sizehint_forced = 0; is_closing = 0; in_show = 0; in_show_maximized = 0; im_enabled = FALSE; #ifndef QT_NO_LAYOUT lay_out = 0; #endif extra = 0; // no extra widget info #ifndef QT_NO_PALETTE bg_col = pal.active().background(); // default background color #endif create(); // platform-dependent init #ifndef QT_NO_PALETTE pal = isTopLevel() ? QApplication::palette() : parentWidget()->palette(); #endif if ( ! isTopLevel() ) fnt = parentWidget()->font(); #if defined(Q_WS_X11) fnt.x11SetScreen( x11Screen() ); #endif // Q_WS_X11 if ( !isDesktop() ) setBackgroundFromMode(); //### parts of this are done in create but not all (see reparent(...) ) // make sure move/resize events are sent to all widgets QApplication::postEvent( this, new QMoveEvent( crect.topLeft(), crect.topLeft() ) ); QApplication::postEvent( this, new QResizeEvent(crect.size(), crect.size()) ); if ( isTopLevel() ) { setWState( WState_ForceHide | WState_CreatedHidden ); QFocusData *fd = focusData( TRUE ); if ( fd->focusWidgets.findRef(this) < 0 ) fd->focusWidgets.append( this ); } else { // propagate enabled state if ( !parentWidget()->isEnabled() ) setWState( WState_Disabled ); // new widgets do not show up in already visible parents if ( parentWidget()->isVisible() ) setWState( WState_ForceHide | WState_CreatedHidden ); } if ( ++instanceCounter > maxInstances ) maxInstances = instanceCounter; } /*! Destroys the widget. All this widget's children are deleted first. The application exits if this widget is the main widget. */ QWidget::~QWidget() { #if defined (QT_CHECK_STATE) if ( paintingActive() ) qWarning( "%s (%s): deleted while being painted", className(), name() ); #endif // Remove myself and all children from the can-take-focus list QFocusData *f = focusData( FALSE ); if ( f ) { QPtrListIterator<QWidget> it(f->focusWidgets); QWidget *w; while ( (w = it.current()) ) { ++it; QWidget * p = w; while( p && p != this ) p = p->parentWidget(); if ( p ) // my descendant f->focusWidgets.removeRef( w ); } } --instanceCounter; if ( QApplication::main_widget == this ) { // reset main widget QApplication::main_widget = 0; if (qApp) qApp->quit(); } if ( hasFocus() ) clearFocus(); if ( isTopLevel() && isShown() && winId() ) hide(); // A parent widget must destroy all its children before destroying itself if ( childObjects ) { // delete children objects QObjectListIt it(*childObjects); QObject *obj; while ( (obj=it.current()) ) { ++it; obj->parentObj = 0; childObjects->removeRef( obj ); delete obj; } delete childObjects; childObjects = 0; } QApplication::removePostedEvents( this ); destroy(); // platform-dependent cleanup if ( extra ) deleteExtra(); } int QWidget::instanceCounter = 0; // Current number of widget instances int QWidget::maxInstances = 0; // Maximum number of widget instances /*! \internal Creates the global widget mapper. The widget mapper converts window handles to widget pointers. \sa destroyMapper() */ void QWidget::createMapper() { mapper = new QWidgetMapper; Q_CHECK_PTR( mapper ); } /*! \internal Destroys the global widget mapper. \sa createMapper() */ void QWidget::destroyMapper() { if ( !mapper ) // already gone return; QWidgetIntDictIt it( *((QWidgetIntDict*)mapper) ); QWidgetMapper * myMapper = mapper; mapper = 0; register QWidget *w; while ( (w=it.current()) ) { // remove parents widgets ++it; if ( !w->parentObj ) // widget is a parent w->destroy( TRUE, TRUE ); } delete myMapper; } static QWidgetList *wListInternal( QWidgetMapper *mapper, bool onlyTopLevel ) { QWidgetList *list = new QWidgetList; Q_CHECK_PTR( list ); if ( mapper ) { QWidget *w; QWidgetIntDictIt it( *((QWidgetIntDict*)mapper) ); while ( (w=it.current()) ) { ++it; if ( !onlyTopLevel || w->isTopLevel() ) list->append( w ); } } return list; } /*! \internal Returns a list of all widgets. \sa tlwList(), QApplication::allWidgets() */ QWidgetList *QWidget::wList() { return wListInternal( mapper, FALSE ); } /*! \internal Returns a list of all top level widgets. \sa wList(), QApplication::topLevelWidgets() */ QWidgetList *QWidget::tlwList() { return wListInternal( mapper, TRUE ); } void QWidget::setWinId( WId id ) // set widget identifier { if ( !mapper ) // mapper destroyed return; if ( winid ) mapper->remove( winid ); winid = id; #if defined(Q_WS_X11) hd = id; // X11: hd == ident #endif if ( id ) mapper->insert( this ); } /*! \internal Returns a pointer to the block of extra widget data. */ QWExtra *QWidget::extraData() { return extra; } /*! \internal Returns a pointer to the block of extra top level widget data. This data is guaranteed to exist for top level widgets. */ QTLWExtra *QWidget::topData() { createTLExtra(); return extra->topextra; } void QWidget::createTLExtra() { if ( !extra ) createExtra(); if ( !extra->topextra ) { QTLWExtra* x = extra->topextra = new QTLWExtra; #if defined( Q_WS_WIN ) || defined( Q_WS_MAC ) x->opacity = 255; #endif #ifndef QT_NO_WIDGET_TOPEXTRA x->icon = 0; #endif x->focusData = 0; x->fleft = x->fright = x->ftop = x->fbottom = 0; x->incw = x->inch = 0; x->basew = x->baseh = 0; x->normalGeometry = QRect(0,0,-1,-1); #if defined(Q_WS_X11) x->embedded = 0; x->parentWinId = 0; x->spont_unmapped = 0; x->dnd = 0; x->uspos = 0; x->ussize = 0; #endif x->savedFlags = 0; #if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER) x->decor_allocated_region = QRegion(); x->qwsManager = 0; #endif createTLSysExtra(); } } /*! \internal Creates the widget extra data. */ void QWidget::createExtra() { if ( !extra ) { // if not exists extra = new QWExtra; Q_CHECK_PTR( extra ); extra->minw = extra->minh = 0; extra->maxw = extra->maxh = QWIDGETSIZE_MAX; extra->bg_pix = 0; extra->focus_proxy = 0; #ifndef QT_NO_CURSOR extra->curs = 0; #endif extra->topextra = 0; extra->bg_mode = PaletteBackground; extra->bg_mode_visual = PaletteBackground; extra->bg_origin = WidgetOrigin; #ifndef QT_NO_STYLE extra->style = 0; #endif extra->size_policy = QSizePolicy( QSizePolicy::Preferred, QSizePolicy::Preferred ); createSysExtra(); } } /*! \internal Deletes the widget extra data. */ void QWidget::deleteExtra() { if ( extra ) { // if exists delete extra->bg_pix; #ifndef QT_NO_CURSOR delete extra->curs; #endif deleteSysExtra(); if ( extra->topextra ) { deleteTLSysExtra(); #ifndef QT_NO_WIDGET_TOPEXTRA delete extra->topextra->icon; #endif delete extra->topextra->focusData; #if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER) delete extra->topextra->qwsManager; #endif delete extra->topextra; } delete extra; // extra->xic destroyed in QWidget::destroy() extra = 0; } } /*! \internal This function is called when a widget is hidden or destroyed. It resets some application global pointers that should only refer active, visible widgets. */ void QWidget::deactivateWidgetCleanup() { // If this was the active application window, reset it if ( this == QApplication::active_window ) qApp->setActiveWindow( 0 ); // If the is the active mouse press widget, reset it #ifdef Q_WS_MAC extern QGuardedPtr<QWidget> qt_button_down; #else extern QWidget *qt_button_down; #endif if ( this == (QWidget *)qt_button_down ) qt_button_down = 0; } /*! Returns a pointer to the widget with window identifer/handle \a id. The window identifier type depends on the underlying window system, see \c qwindowdefs.h for the actual definition. If there is no widget with this identifier, 0 is returned. */ QWidget *QWidget::find( WId id ) { return mapper ? mapper->find( id ) : 0; } /*! \fn QWidgetMapper *QWidget::wmapper() \internal Returns a pointer to the widget mapper. The widget mapper is an internal dictionary that is used to map from window identifiers/handles to widget pointers. \sa find(), id() */ /*! \fn WFlags QWidget::getWFlags() const Returns the widget flags for this this widget. Widget flags are a combination of \l{Qt::WidgetFlags}. \sa testWFlags(), setWFlags(), clearWFlags() */ /*! \fn void QWidget::setWFlags( WFlags f ) Sets the widget flags \a f. Widget flags are a combination of \l{Qt::WidgetFlags}. \sa testWFlags(), getWFlags(), clearWFlags() */ /*! \fn void QWidget::clearWFlags( WFlags f ) Clears the widget flags \a f. Widget flags are a combination of \l{Qt::WidgetFlags}. \sa testWFlags(), getWFlags(), setWFlags() */ /*! \fn WId QWidget::winId() const Returns the window system identifier of the widget. Portable in principle, but if you use it you are probably about to do something non-portable. Be careful. \sa find() */ #ifndef QT_NO_STYLE /*! Returns the GUI style for this widget \sa QWidget::setStyle(), QApplication::setStyle(), QApplication::style() */ QStyle& QWidget::style() const { if ( extra && extra->style ) return *extra->style; QStyle &ret = qApp->style(); return ret; } /*! Sets the widget's GUI style to \a style. Ownership of the style object is not transferred. If no style is set, the widget uses the application's style, QApplication::style() instead. Setting a widget's style has no effect on existing or future child widgets. \warning This function is particularly useful for demonstration purposes, where you want to show Qt's styling capabilities. Real applications should avoid it and use one consistent GUI style instead. \sa style(), QStyle, QApplication::style(), QApplication::setStyle() */ void QWidget::setStyle( QStyle *style ) { QStyle& old = QWidget::style(); createExtra(); extra->style = style; if ( !testWFlags(WType_Desktop) // (except desktop) && testWState(WState_Polished)) { // (and have been polished) old.unPolish( this ); QWidget::style().polish( this ); } styleChange( old ); } /*! \overload Sets the widget's GUI style to \a style using the QStyleFactory. */ QStyle* QWidget::setStyle( const QString &style ) { QStyle *s = QStyleFactory::create( style ); setStyle( s ); return s; } /*! This virtual function is called when the style of the widgets changes. \a oldStyle is the previous GUI style; you can get the new style from style(). Reimplement this function if your widget needs to know when its GUI style changes. You will almost certainly need to update the widget using update(). The default implementation updates the widget including its geometry. \sa QApplication::setStyle(), style(), update(), updateGeometry() */ void QWidget::styleChange( QStyle& /* oldStyle */ ) { update(); updateGeometry(); } #endif /*! \property QWidget::isTopLevel \brief whether the widget is a top-level widget A top-level widget is a widget which usually has a frame and a \link QWidget::caption caption (title)\endlink. \link QWidget::isPopup() Popup\endlink and \link QWidget::isDesktop() desktop\endlink widgets are also top-level widgets. A top-level widget can have a \link QWidget::parentWidget() parent widget\endlink. It will then be grouped with its parent and deleted when the parent is deleted, minimized when the parent is minimized etc. If supported by the window manager, it will also have a common taskbar entry with its parent. QDialog and QMainWindow widgets are by default top-level, even if a parent widget is specified in the constructor. This behavior is specified by the \c WType_TopLevel widget flag. \sa topLevelWidget(), isDialog(), isModal(), isPopup(), isDesktop(), parentWidget() */ /*! \property QWidget::isDialog \brief whether the widget is a dialog widget A dialog widget is a secondary top-level widget, i.e. a top-level widget with a parent. \sa isTopLevel(), QDialog */ /*! \property QWidget::isPopup \brief whether the widget is a popup widget A popup widget is created by specifying the widget flag \c WType_Popup to the widget constructor. A popup widget is also a top-level widget. \sa isTopLevel() */ /*! \property QWidget::isDesktop \brief whether the widget is a desktop widget, i.e. represents the desktop A desktop widget is also a top-level widget. \sa isTopLevel(), QApplication::desktop() */ /*! \property QWidget::isModal \brief whether the widget is a modal widget This property only makes sense for top-level widgets. A modal widget prevents widgets in all other top-level widgets from getting any input. \sa isTopLevel(), isDialog(), QDialog */ /*! \property QWidget::underMouse \brief whether the widget is under the mouse cursor This value is not updated properly during drag and drop operations. \sa QEvent::Enter, QEvent::Leave */ /*! \property QWidget::minimized \brief whether this widget is minimized (iconified) This property is only relevant for top-level widgets. \sa showMinimized(), visible, show(), hide(), showNormal(), maximized */ bool QWidget::isMinimized() const { return testWState(WState_Minimized); } /*! Shows the widget minimized, as an icon. Calling this function only affects \link isTopLevel() top-level widgets\endlink. \sa showNormal(), showMaximized(), show(), hide(), isVisible(), isMinimized() */ void QWidget::showMinimized() { bool isMin = isMinimized(); if (isMin && isVisible()) return; if (!isMin) setWindowState((windowState() & ~WindowActive) | WindowMinimized); show(); if (!isTopLevel()) QApplication::sendPostedEvents(this, QEvent::ShowMinimized); } /*! \property QWidget::maximized \brief whether this widget is maximized This property is only relevant for top-level widgets. Note that due to limitations in some window-systems, this does not always report the expected results (e.g. if the user on X11 maximizes the window via the window manager, Qt has no way of distinguishing this from any other resize). This is expected to improve as window manager protocols evolve. \sa windowState(), showMaximized(), visible, show(), hide(), showNormal(), minimized */ bool QWidget::isMaximized() const { return testWState(WState_Maximized); } /*! Returns the current window state. The window state is a OR'ed combination of Qt::WindowState: \c WindowMinimized, \c WindowMaximized, \c WindowFullScreen and \c WindowActive. \sa Qt::WindowState setWindowState() */ uint QWidget::windowState() const { uint state = 0; if (testWState(WState_Minimized)) state |= WindowMinimized; if (testWState(WState_Maximized)) state |= WindowMaximized; if (testWState(WState_FullScreen)) state |= WindowFullScreen; if (isActiveWindow()) state |= WindowActive; return state; } /*! \fn void QWidget::setWindowState(uint windowState) Sets the window state to \a windowState. The window state is a OR'ed combination of Qt::WindowState: \c WindowMinimized, \c WindowMaximized, \c WindowFullScreen and \c WindowActive. If the window is not visible (i.e. isVisible() returns FALSE), the window state will take effect when show() is called. For visible windows, the change is immediate. For example, to toggle between full-screen and mormal mode, use the following code: \code w->setWindowState(w->windowState() ^ WindowFullScreen); \endcode In order to restore and activate a minimized window (while preserving its maximized and/or full-screen state), use the following: \code w->setWindowState(w->windowState() & ~WindowMinimized | WindowActive); \endcode Note: On some window systems \c WindowActive is not immediate, and may be ignored in certain cases. \sa Qt::WindowState windowState() */ /*! \property QWidget::fullScreen \brief whether the widget is full screen \sa windowState(), minimized, maximized */ bool QWidget::isFullScreen() const { return testWState(WState_FullScreen); } /*! Shows the widget in full-screen mode. Calling this function only affects top-level widgets. To return from full-screen mode, call showNormal(). Full-screen mode works fine under Windows, but has certain problems under X. These problems are due to limitations of the ICCCM protocol that specifies the communication between X11 clients and the window manager. ICCCM simply does not understand the concept of non-decorated full-screen windows. Therefore, the best we can do is to request a borderless window and place and resize it to fill the entire screen. Depending on the window manager, this may or may not work. The borderless window is requested using MOTIF hints, which are at least partially supported by virtually all modern window managers. An alternative would be to bypass the window manager entirely and create a window with the WX11BypassWM flag. This has other severe problems though, like totally broken keyboard focus and very strange effects on desktop changes or when the user raises other windows. X11 window managers that follow modern post-ICCCM specifications support full-screen mode properly. \sa showNormal(), showMaximized(), show(), hide(), isVisible() */ void QWidget::showFullScreen() { bool isFull = isFullScreen(); if (isFull && isVisible()) return; if (!isFull) setWindowState(windowState() | WindowFullScreen); show(); if (!isTopLevel()) QApplication::sendPostedEvents(this, QEvent::ShowFullScreen); setActiveWindow(); } /*! Shows the widget maximized. Calling this function only affects \link isTopLevel() top-level widgets\endlink. On X11, this function may not work properly with certain window managers. See the \link geometry.html Window Geometry documentation\endlink for an explanation. \sa setWindowState(), showNormal(), showMinimized(), show(), hide(), isVisible() */ void QWidget::showMaximized() { if (isMaximized() && isVisible() && !isMinimized()) return; setWindowState((windowState() & ~WindowMinimized) | WindowMaximized); show(); if (!isTopLevel()) QApplication::sendPostedEvents(this, QEvent::ShowMaximized); } /*! Restores the widget after it has been maximized or minimized. Calling this function only affects \link isTopLevel() top-level widgets\endlink. \sa setWindowState(), showMinimized(), showMaximized(), show(), hide(), isVisible() */ void QWidget::showNormal() { setWindowState(WindowNoState); show(); if (!isTopLevel()) QApplication::sendPostedEvents(this, QEvent::ShowNormal); } /*! Returns TRUE if this widget would become enabled if \a ancestor is enabled; otherwise returns FALSE. This is the case if neither the widget itself nor every parent up to but excluding \a ancestor has been explicitly disabled. isEnabledTo(0) is equivalent to isEnabled(). \sa setEnabled() enabled */ bool QWidget::isEnabledTo( QWidget* ancestor ) const { const QWidget * w = this; while ( w && !w->testWState(WState_ForceDisabled) && !w->isTopLevel() && w->parentWidget() && w->parentWidget() != ancestor ) w = w->parentWidget(); return !w->testWState( WState_ForceDisabled ); } /*! \fn bool QWidget::isEnabledToTLW() const \obsolete This function is deprecated. It is equivalent to isEnabled() */ /*! \property QWidget::enabled \brief whether the widget is enabled An enabled widget receives keyboard and mouse events; a disabled widget does not. In fact, an enabled widget only receives keyboard events when it is in focus. Some widgets display themselves differently when they are disabled. For example a button might draw its label grayed out. If your widget needs to know when it becomes enabled or disabled, you can reimplement the enabledChange() function. Disabling a widget implicitly disables all its children. Enabling respectively enables all child widgets unless they have been explicitly disabled. \sa isEnabled(), isEnabledTo(), QKeyEvent, QMouseEvent, enabledChange() */ void QWidget::setEnabled( bool enable ) { if ( enable ) clearWState( WState_ForceDisabled ); else setWState( WState_ForceDisabled ); if ( !isTopLevel() && parentWidget() && !parentWidget()->isEnabled() && enable ) return; // nothing we can do if ( enable ) { if ( testWState(WState_Disabled) ) { clearWState( WState_Disabled ); setBackgroundFromMode(); enabledChange( !enable ); if ( children() ) { QObjectListIt it( *children() ); QWidget *w; while( (w = (QWidget *)it.current()) != 0 ) { ++it; if ( w->isWidgetType() && !w->testWState( WState_ForceDisabled ) ) w->setEnabled( TRUE ); } } } } else { if ( !testWState(WState_Disabled) ) { if (focusWidget() == this) { bool parentIsEnabled = (!parentWidget() || parentWidget()->isEnabled()); if (!parentIsEnabled || !focusNextPrevChild(TRUE)) clearFocus(); } setWState( WState_Disabled ); setBackgroundFromMode(); enabledChange( !enable ); if ( children() ) { QObjectListIt it( *children() ); QWidget *w; while( (w = (QWidget *)it.current()) != 0 ) { ++it; if ( w->isWidgetType() && w->isEnabled() ) { w->setEnabled( FALSE ); w->clearWState( WState_ForceDisabled ); } } } } } #if defined(Q_WS_X11) if ( testWState( WState_OwnCursor ) ) { // enforce the windows behavior of clearing the cursor on // disabled widgets extern void qt_x11_enforce_cursor( QWidget * w ); // defined in qwidget_x11.cpp qt_x11_enforce_cursor( this ); } #endif #ifdef Q_WS_WIN QInputContext::enable( this, im_enabled & !((bool)testWState(WState_Disabled)) ); #endif } /*! Disables widget input events if \a disable is TRUE; otherwise enables input events. See the \l enabled documentation for more information. \sa isEnabledTo(), QKeyEvent, QMouseEvent, enabledChange() */ void QWidget::setDisabled( bool disable ) { setEnabled( !disable ); } /*! \fn void QWidget::enabledChange( bool oldEnabled ) This virtual function is called from setEnabled(). \a oldEnabled is the previous setting; you can get the new setting from isEnabled(). Reimplement this function if your widget needs to know when it becomes enabled or disabled. You will almost certainly need to update the widget using update(). The default implementation repaints the visible part of the widget. \sa setEnabled(), isEnabled(), repaint(), update(), clipRegion() */ void QWidget::enabledChange( bool ) { update(); #if defined(QT_ACCESSIBILITY_SUPPORT) QAccessible::updateAccessibility( this, 0, QAccessible::StateChanged ); #endif } /*! \fn void QWidget::windowActivationChange( bool oldActive ) This virtual function is called for a widget when its window is activated or deactivated by the window system. \a oldActive is the previous state; you can get the new setting from isActiveWindow(). Reimplement this function if your widget needs to know when its window becomes activated or deactivated. The default implementation updates the visible part of the widget if the inactive and the active colorgroup are different for colors other than the highlight and link colors. \sa setActiveWindow(), isActiveWindow(), update(), palette() */ void QWidget::windowActivationChange( bool ) { #ifndef QT_NO_PALETTE if ( !isVisible() ) return; const QColorGroup &acg = palette().active(); const QColorGroup &icg = palette().inactive(); if ( acg != icg ) { BackgroundMode bm = backgroundMode(); QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode(bm); if ( bm > NoBackground && acg.brush(role) != icg.brush(role) ) setBackgroundFromMode(); else if ( acg.background() == icg.background() && acg.base() == icg.base() && acg.text() == icg.text() && acg.foreground() == icg.foreground() && acg.button() == icg.button() && acg.buttonText() == icg.buttonText() && acg.brightText() == icg.brightText() && acg.dark() == icg.dark() && acg.light() == icg.light() && acg.mid() == icg.mid() && acg.midlight() == icg.midlight() && acg.shadow() == icg.shadow() ) return; update(); } #endif } /*! \property QWidget::frameGeometry \brief geometry of the widget relative to its parent including any window frame See the \link geometry.html Window Geometry documentation\endlink for an overview of geometry issues with top-level widgets. \sa geometry() x() y() pos() */ QRect QWidget::frameGeometry() const { if (isTopLevel() && ! isPopup()) { if (fstrut_dirty) updateFrameStrut(); QWidget *that = (QWidget *) this; QTLWExtra *top = that->topData(); return QRect(crect.x() - top->fleft, crect.y() - top->ftop, crect.width() + top->fleft + top->fright, crect.height() + top->ftop + top->fbottom); } return crect; } /*! \property QWidget::x \brief the x coordinate of the widget relative to its parent including any window frame See the \link geometry.html Window Geometry documentation\endlink for an overview of top-level widget geometry. \sa frameGeometry, y, pos */ int QWidget::x() const { if (isTopLevel() && ! isPopup()) { if (fstrut_dirty) updateFrameStrut(); QWidget *that = (QWidget *) this; return crect.x() - that->topData()->fleft; } return crect.x(); } /*! \property QWidget::y \brief the y coordinate of the widget relative to its parent and including any window frame See the \link geometry.html Window Geometry documentation\endlink for an overview of top-level widget geometry. \sa frameGeometry, x, pos */ int QWidget::y() const { if (isTopLevel() && ! isPopup()) { if (fstrut_dirty) updateFrameStrut(); QWidget *that = (QWidget *) this; return crect.y() - that->topData()->ftop; } return crect.y(); } /*! \property QWidget::pos \brief the position of the widget within its parent widget If the widget is a top-level widget, the position is that of the widget on the desktop, including its frame. When changing the position, the widget, if visible, receives a move event (moveEvent()) immediately. If the widget is not currently visible, it is guaranteed to receive an event before it is shown. move() is virtual, and all other overloaded move() implementations in Qt call it. \warning Calling move() or setGeometry() inside moveEvent() can lead to infinite recursion. See the \link geometry.html Window Geometry documentation\endlink for an overview of top-level widget geometry. \sa frameGeometry, size x(), y() */ QPoint QWidget::pos() const { if (isTopLevel() && ! isPopup()) { if (fstrut_dirty) updateFrameStrut(); QWidget *that = (QWidget *) this; QTLWExtra *top = that->topData(); return QPoint(crect.x() - top->fleft, crect.y() - top->ftop); } return crect.topLeft(); } /*! \property QWidget::geometry \brief the geometry of the widget relative to its parent and excluding the window frame When changing the geometry, the widget, if visible, receives a move event (moveEvent()) and/or a resize event (resizeEvent()) immediately. If the widget is not currently visible, it is guaranteed to receive appropriate events before it is shown. The size component is adjusted if it lies outside the range defined by minimumSize() and maximumSize(). setGeometry() is virtual, and all other overloaded setGeometry() implementations in Qt call it. \warning Calling setGeometry() inside resizeEvent() or moveEvent() can lead to infinite recursion. See the \link geometry.html Window Geometry documentation\endlink for an overview of top-level widget geometry. \sa frameGeometry(), rect(), move(), resize(), moveEvent(), resizeEvent(), minimumSize(), maximumSize() */ /*! \property QWidget::size \brief the size of the widget excluding any window frame When resizing, the widget, if visible, receives a resize event (resizeEvent()) immediately. If the widget is not currently visible, it is guaranteed to receive an event before it is shown. The size is adjusted if it lies outside the range defined by minimumSize() and maximumSize(). Furthermore, the size is always at least QSize(1, 1). For toplevel widgets, the minimum size might be larger, depending on the window manager. If you want a top-level window to have a fixed size, call setResizeMode( QLayout::FreeResize ) on its layout. resize() is virtual, and all other overloaded resize() implementations in Qt call it. \warning Calling resize() or setGeometry() inside resizeEvent() can lead to infinite recursion. \sa pos, geometry, minimumSize, maximumSize, resizeEvent() */ /*! \property QWidget::width \brief the width of the widget excluding any window frame See the \link geometry.html Window Geometry documentation\endlink for an overview of top-level widget geometry. \sa geometry, height, size */ /*! \property QWidget::height \brief the height of the widget excluding any window frame See the \link geometry.html Window Geometry documentation\endlink for an overview of top-level widget geometry. \sa geometry, width, size */ /*! \property QWidget::rect \brief the internal geometry of the widget excluding any window frame The rect property equals QRect(0, 0, width(), height()). See the \link geometry.html Window Geometry documentation\endlink for an overview of top-level widget geometry. \sa size */ /*! \property QWidget::childrenRect \brief the bounding rectangle of the widget's children Hidden children are excluded. \sa childrenRegion() geometry() */ QRect QWidget::childrenRect() const { QRect r( 0, 0, 0, 0 ); if ( !children() ) return r; QObjectListIt it( *children() ); QObject *obj; while ( (obj = it.current()) ) { ++it; if ( obj->isWidgetType() && !((QWidget*)obj)->isHidden() && !((QWidget*)obj)->isTopLevel()) r = r.unite( ((QWidget*)obj)->geometry() ); } return r; } /*! \property QWidget::childrenRegion \brief the combined region occupied by the widget's children Hidden children are excluded. \sa childrenRect() geometry() */ QRegion QWidget::childrenRegion() const { QRegion r; if ( !children() ) return r; QObjectListIt it( *children() ); // iterate over all children QObject *obj; while ( (obj=it.current()) ) { ++it; if ( obj->isWidgetType() && !((QWidget*)obj)->isHidden() && !((QWidget*)obj)->isTopLevel()) r = r.unite( ((QWidget*)obj)->geometry() ); } return r; } /*! \property QWidget::minimumSize \brief the widget's minimum size The widget cannot be resized to a smaller size than the minimum widget size. The widget's size is forced to the minimum size if the current size is smaller. If you use a layout inside the widget, the minimum size will be set by the layout and not by setMinimumSize(), unless you set the layout's resize mode to QLayout::FreeResize. \sa minimumWidth, minimumHeight, maximumSize, sizeIncrement QLayout::setResizeMode() */ QSize QWidget::minimumSize() const { return extra ? QSize( extra->minw, extra->minh ) : QSize( 0, 0 ); } /*! \property QWidget::maximumSize \brief the widget's maximum size The widget cannot be resized to a larger size than the maximum widget size. \sa maximumWidth(), maximumHeight(), setMaximumSize(), minimumSize(), sizeIncrement() */ QSize QWidget::maximumSize() const { return extra ? QSize( extra->maxw, extra->maxh ) : QSize( QWIDGETSIZE_MAX, QWIDGETSIZE_MAX ); } /*! \property QWidget::minimumWidth \brief the widget's minimum width This property corresponds to minimumSize().width(). \sa minimumSize, minimumHeight */ /*! \property QWidget::minimumHeight \brief the widget's minimum height This property corresponds to minimumSize().height(). \sa minimumSize, minimumWidth */ /*! \property QWidget::maximumWidth \brief the widget's maximum width This property corresponds to maximumSize().width(). \sa maximumSize, maximumHeight */ /*! \property QWidget::maximumHeight \brief the widget's maximum height This property corresponds to maximumSize().height(). \sa maximumSize, maximumWidth */ /*! \property QWidget::sizeIncrement \brief the size increment of the widget When the user resizes the window, the size will move in steps of sizeIncrement().width() pixels horizontally and sizeIncrement.height() pixels vertically, with baseSize() as the basis. Preferred widget sizes are for non-negative integers \e i and \e j: \code width = baseSize().width() + i * sizeIncrement().width(); height = baseSize().height() + j * sizeIncrement().height(); \endcode Note that while you can set the size increment for all widgets, it only affects top-level widgets. \warning The size increment has no effect under Windows, and may be disregarded by the window manager on X. \sa size, minimumSize, maximumSize */ QSize QWidget::sizeIncrement() const { return ( extra && extra->topextra ) ? QSize( extra->topextra->incw, extra->topextra->inch ) : QSize( 0, 0 ); } /*! \property QWidget::baseSize \brief the base size of the widget The base size is used to calculate a proper widget size if the widget defines sizeIncrement(). \sa setSizeIncrement() */ QSize QWidget::baseSize() const { return ( extra != 0 && extra->topextra != 0 ) ? QSize( extra->topextra->basew, extra->topextra->baseh ) : QSize( 0, 0 ); } /*! Sets both the minimum and maximum sizes of the widget to \a s, thereby preventing it from ever growing or shrinking. \sa setMaximumSize() setMinimumSize() */ void QWidget::setFixedSize( const QSize & s) { setMinimumSize( s ); setMaximumSize( s ); resize( s ); } /*! \overload void QWidget::setFixedSize( int w, int h ) Sets the width of the widget to \a w and the height to \a h. */ void QWidget::setFixedSize( int w, int h ) { setMinimumSize( w, h ); setMaximumSize( w, h ); resize( w, h ); } void QWidget::setMinimumWidth( int w ) { setMinimumSize( w, minimumSize().height() ); } void QWidget::setMinimumHeight( int h ) { setMinimumSize( minimumSize().width(), h ); } void QWidget::setMaximumWidth( int w ) { setMaximumSize( w, maximumSize().height() ); } void QWidget::setMaximumHeight( int h ) { setMaximumSize( maximumSize().width(), h ); } /*! Sets both the minimum and maximum width of the widget to \a w without changing the heights. Provided for convenience. \sa sizeHint() minimumSize() maximumSize() setFixedSize() */ void QWidget::setFixedWidth( int w ) { setMinimumSize( w, minimumSize().height() ); setMaximumSize( w, maximumSize().height() ); } /*! Sets both the minimum and maximum heights of the widget to \a h without changing the widths. Provided for convenience. \sa sizeHint() minimumSize() maximumSize() setFixedSize() */ void QWidget::setFixedHeight( int h ) { setMinimumSize( minimumSize().width(), h ); setMaximumSize( maximumSize().width(), h ); } /*! Translates the widget coordinate \a pos to the coordinate system of \a parent. The \a parent must not be 0 and must be a parent of the calling widget. \sa mapFrom() mapToParent() mapToGlobal() hasMouse() */ QPoint QWidget::mapTo( QWidget * parent, const QPoint & pos ) const { QPoint p = pos; if ( parent ) { const QWidget * w = this; while ( w != parent ) { p = w->mapToParent( p ); w = w->parentWidget(); } } return p; } /*! Translates the widget coordinate \a pos from the coordinate system of \a parent to this widget's coordinate system. The \a parent must not be 0 and must be a parent of the calling widget. \sa mapTo() mapFromParent() mapFromGlobal() hasMouse() */ QPoint QWidget::mapFrom( QWidget * parent, const QPoint & pos ) const { QPoint p( pos ); if ( parent ) { const QWidget * w = this; while ( w != parent ) { p = w->mapFromParent( p ); w = w->parentWidget(); } } return p; } /*! Translates the widget coordinate \a pos to a coordinate in the parent widget. Same as mapToGlobal() if the widget has no parent. \sa mapFromParent() mapTo() mapToGlobal() hasMouse() */ QPoint QWidget::mapToParent( const QPoint &pos ) const { return pos + crect.topLeft(); } /*! Translates the parent widget coordinate \a pos to widget coordinates. Same as mapFromGlobal() if the widget has no parent. \sa mapToParent() mapFrom() mapFromGlobal() hasMouse() */ QPoint QWidget::mapFromParent( const QPoint &pos ) const { return pos - crect.topLeft(); } /*! Returns the top-level widget for this widget, i.e. the next ancestor widget that has (or could have) a window-system frame. If the widget is a top-level, the widget itself is returned. Typical usage is changing the window caption: \code aWidget->topLevelWidget()->setCaption( "New Caption" ); \endcode \sa isTopLevel() */ QWidget *QWidget::topLevelWidget() const { QWidget *w = (QWidget *)this; QWidget *p = w->parentWidget(); while ( !w->testWFlags(WType_TopLevel) && p ) { w = p; p = p->parentWidget(); } return w; } /*! \property QWidget::paletteForegroundColor \brief the foreground color of the widget setPaletteForegroundColor() is a convenience function that creates and sets a modified QPalette with setPalette(). The palette is modified according to the widget's \e {background mode}. For example, if the background mode is \c PaletteButton the palette entry \c QColorGroup::ButtonText is set to color. \sa setPalette() QApplication::setPalette() backgroundMode() foregroundColor() setBackgroundMode() setEraseColor() */ const QColor &QWidget::paletteForegroundColor() const { #ifndef QT_NO_PALETTE BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; return colorGroup().color( QPalette::foregroundRoleFromMode(mode) ); #else return Qt::black; #endif } void QWidget::setPaletteForegroundColor( const QColor & color ) { #ifndef QT_NO_PALETTE BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; QPalette pal = palette(); QColorGroup::ColorRole role = QPalette::foregroundRoleFromMode( mode ); pal.setColor( QPalette::Active, role, color ); pal.setColor( QPalette::Inactive, role, color ); pal.setColor( QPalette::Disabled, role, color ); setPalette( pal ); #endif } /*! Same as paletteForegroundColor() */ const QColor &QWidget::foregroundColor() const { return paletteForegroundColor(); } /*! \fn const QColor& QWidget::eraseColor() const Returns the erase color of the widget. \sa setEraseColor() setErasePixmap() backgroundColor() */ /*! Sets the erase color of the widget to \a color. The erase color is the color the widget is to be cleared to before paintEvent() is called. If there is an erase pixmap (set using setErasePixmap()), then this property has an indeterminate value. \sa erasePixmap(), backgroundColor(), backgroundMode(), palette() */ void QWidget::setEraseColor( const QColor & color ) { setBackgroundModeDirect( FixedColor ); setBackgroundColorDirect( color ); update(); } /*! Returns the widget's erase pixmap. \sa setErasePixmap() eraseColor() */ const QPixmap *QWidget::erasePixmap() const { return ( extra && extra->bg_pix ) ? extra->bg_pix : 0; } /*! Sets the widget's erase pixmap to \a pixmap. This pixmap is used to clear the widget before paintEvent() is called. */ void QWidget::setErasePixmap( const QPixmap &pixmap ) { // This function is called with a null pixmap by setBackgroundEmpty(). setBackgroundPixmapDirect( pixmap ); setBackgroundModeDirect( FixedPixmap ); update(); } void QWidget::setBackgroundFromMode() { #ifndef QT_NO_PALETTE QColorGroup::ColorRole r = QColorGroup::Background; if ( extra ) { int i = (BackgroundMode)extra->bg_mode; if ( i == FixedColor || i == FixedPixmap || i == NoBackground ) { // Mode is for fixed color, not one based on palette, // so nothing to do. return; } switch( i ) { case PaletteForeground: r = QColorGroup::Foreground; break; case PaletteButton: r = QColorGroup::Button; break; case PaletteLight: r = QColorGroup::Light; break; case PaletteMidlight: r = QColorGroup::Midlight; break; case PaletteDark: r = QColorGroup::Dark; break; case PaletteMid: r = QColorGroup::Mid; break; case PaletteText: r = QColorGroup::Text; break; case PaletteBrightText: r = QColorGroup::BrightText; break; case PaletteBase: r = QColorGroup::Base; break; case PaletteBackground: r = QColorGroup::Background; break; case PaletteShadow: r = QColorGroup::Shadow; break; case PaletteHighlight: r = QColorGroup::Highlight; break; case PaletteHighlightedText: r = QColorGroup::HighlightedText; break; case PaletteButtonText: r = QColorGroup::ButtonText; break; case X11ParentRelative: #if defined(Q_WS_X11) setBackgroundX11Relative(); #endif return; } } const QColorGroup &cg = colorGroup(); QPixmap * p = cg.brush( r ).pixmap(); if ( p ) setBackgroundPixmapDirect( *p ); else setBackgroundColorDirect( cg.color( r ) ); #endif } /*! \enum Qt::BackgroundMode This enum describes how the background of a widget changes, as the widget's palette changes. The background is what the widget contains when \link QWidget::paintEvent() paintEvent()\endlink is called. To minimize flicker, this should be the most common color or pixmap in the widget. For \c PaletteBackground, use colorGroup().brush( \c QColorGroup::Background ), and so on. \value PaletteForeground \value PaletteBackground \value PaletteButton \value PaletteLight \value PaletteMidlight \value PaletteDark \value PaletteMid \value PaletteText \value PaletteBrightText \value PaletteButtonText \value PaletteBase \value PaletteShadow \value PaletteHighlight \value PaletteHighlightedText \value PaletteLink \value PaletteLinkVisited \value X11ParentRelative (internal use only) The final three values have special meaning: \value NoBackground the widget is not cleared before paintEvent(). If the widget's paint event always draws on all the pixels, using this mode can be both fast and flicker-free. \value FixedColor the widget is cleared to a fixed color, normally different from all the ones in the palette(). Set using \link QWidget::setPaletteBackgroundColor() setPaletteBackgroundColor()\endlink. \value FixedPixmap the widget is cleared to a fixed pixmap, normally different from all the ones in the palette(). Set using \link QWidget::setPaletteBackgroundPixmap() setPaletteBackgroundPixmap()\endlink. Although \c FixedColor and \c FixedPixmap are sometimes just right, if you use them, make sure that you test your application when the desktop color scheme has been changed. (On X11, a quick way to test this is e.g. "./myapp -bg paleblue". On Windows, you must use the control panel.) \sa QWidget::setBackgroundMode() QWidget::backgroundMode() QWidget::setBackgroundPixmap() QWidget::setPaletteBackgroundColor() */ /*! \property QWidget::backgroundMode \brief the color role used for painting the background of the widget setPaletteBackgroundColor() reads this property to determine which entry of the \link QWidget::palette palette\endlink to set. For most widgets the default suffices (\c PaletteBackground, typically gray), but some need to use \c PaletteBase (the background color for text output, typically white) or another role. QListBox, which is "sunken" and uses the base color to contrast with its environment, does this in its constructor: \code setBackgroundMode( PaletteBase ); \endcode You will never need to set the background mode of a built-in widget in Qt, but you might consider setting it in your custom widgets, so that setPaletteBackgroundColor() works as expected. Note that two of the BackgroundMode values make no sense for setBackgroundMode(), namely \c FixedPixmap and \c FixedColor. You must call setBackgroundPixmap() and setPaletteBackgroundColor() instead. */ Qt::BackgroundMode QWidget::backgroundMode() const { return extra ? (BackgroundMode) extra->bg_mode : PaletteBackground; } void QWidget::setBackgroundMode( BackgroundMode m ) { setBackgroundMode( m, m ); if ( (widget_state & (WState_Visible|WState_BlockUpdates)) == WState_Visible ) update(); } /*! \overload Sets the widget's own background mode to \a m and the visual background mode to \a visual. The visual background mode is used with the designable properties \c backgroundColor, \c foregroundColor and \c backgroundPixmap. For complex controls, the logical background mode sometimes differs from a widget's own background mode. A spinbox for example has \c PaletteBackground as background mode (typically dark gray), while it's embedded lineedit control uses \c PaletteBase (typically white). Since the lineedit covers most of the visual area of a spinbox, it defines \c PaletteBase to be its \a visual background mode. Changing the \c backgroundColor property thus changes the lineedit control's background, which is exactly what the user expects in \e{Qt Designer}. */ void QWidget::setBackgroundMode( BackgroundMode m, BackgroundMode visual ) { if ( m == NoBackground ) { setBackgroundEmpty(); } else if ( m == FixedColor || m == FixedPixmap ) { #if defined(QT_DEBUG) qWarning( "QWidget::setBackgroundMode: FixedColor or FixedPixmap makes" " no sense" ); #endif return; } setBackgroundModeDirect(m); if ( m != visual && !extra ) createExtra(); if ( extra ) extra->bg_mode_visual = visual; } /*! \internal */ void QWidget::setBackgroundModeDirect( BackgroundMode m ) { if ( m == PaletteBackground && !extra ) return; createExtra(); if ( (BackgroundMode)extra->bg_mode != m ) { extra->bg_mode = m; extra->bg_mode_visual = m; setBackgroundFromMode(); } } /*! \property QWidget::paletteBackgroundColor \brief the background color of the widget The palette background color is usually set implicitly by setBackgroundMode(), although it can also be set explicitly by setPaletteBackgroundColor(). setPaletteBackgroundColor() is a convenience function that creates and sets a modified QPalette with setPalette(). The palette is modified according to the widget's background mode. For example, if the background mode is \c PaletteButton the color used for the palette's \c QColorGroup::Button color entry is set. If there is a background pixmap (set using setPaletteBackgroundPixmap()), then the return value of this function is indeterminate. \sa paletteBackgroundPixmap, paletteForegroundColor, palette, colorGroup() */ const QColor & QWidget::paletteBackgroundColor() const { #ifndef QT_NO_PALETTE BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; switch( mode ) { case FixedColor: case FixedPixmap : case NoBackground: case X11ParentRelative: return eraseColor(); default: QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); return colorGroup().color( role ); } #else return eraseColor(); #endif } void QWidget::setPaletteBackgroundColor( const QColor &color ) { #ifndef QT_NO_PALETTE BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; switch( mode ) { case FixedColor: case FixedPixmap : case NoBackground: case X11ParentRelative: setEraseColor( color ); break; default: QPalette pal = palette(); QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); pal.setColor( QPalette::Active, role, color ); pal.setColor( QPalette::Inactive, role, color ); pal.setColor( QPalette::Disabled, role, color ); setPalette( pal ); break; } #else setEraseColor( color ); #endif } /*! \property QWidget::paletteBackgroundPixmap \brief the background pixmap of the widget The palette background pixmap is usually set implicitly by setBackgroundMode(), although it can also be set explicitly by setPaletteBackgroundPixmap(). setPaletteBackgroundPixmap() is a convenience function that creates and sets a modified QPalette with setPalette(). The palette is modified according to the widget's background mode. For example, if the background mode is \c PaletteButton the pixmap used for the palette's \c QColorGroup::Button color entry is set. If there is a plain background color (set using setPaletteBackgroundColor()), then this function returns 0. \sa paletteBackgroundColor, paletteForegroundColor, palette, colorGroup() */ const QPixmap *QWidget::paletteBackgroundPixmap() const { #ifndef QT_NO_PALETTE BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; switch( mode ) { case FixedColor: case FixedPixmap : case NoBackground: case X11ParentRelative: return erasePixmap(); default: QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); return palette().brush( QPalette::Active, role ).pixmap(); } #else return erasePixmap(); #endif } void QWidget::setPaletteBackgroundPixmap( const QPixmap &pixmap ) { #ifndef QT_NO_PALETTE BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; switch( mode ) { case FixedColor: case FixedPixmap : case NoBackground: case X11ParentRelative: setErasePixmap( pixmap ); break; default: QPalette pal = palette(); QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); pal.setBrush( QPalette::Active, role, QBrush( pal.color( QPalette::Active, role ), pixmap ) ); pal.setBrush( QPalette::Inactive, role, QBrush( pal.color( QPalette::Inactive, role ), pixmap ) ); pal.setBrush( QPalette::Disabled, role, QBrush( pal.color( QPalette::Disabled, role ), pixmap ) ); setPalette( pal ); break; } #else setErasePixmap( pixmap ); #endif } /*! \property QWidget::backgroundBrush \brief the widget's background brush The background brush depends on a widget's palette and its background mode. \sa backgroundColor(), backgroundPixmap(), eraseColor(), palette, QApplication::setPalette() */ const QBrush& QWidget::backgroundBrush() const { static QBrush noBrush; #ifndef QT_NO_PALETTE BackgroundMode mode = extra ? (BackgroundMode) extra->bg_mode_visual : PaletteBackground; switch( mode ) { case FixedColor: case FixedPixmap : case NoBackground: case X11ParentRelative: return noBrush; default: QColorGroup::ColorRole role = QPalette::backgroundRoleFromMode( mode ); return colorGroup().brush( role ); } #else return noBrush; #endif } /*! \property QWidget::colorGroup \brief the current color group of the widget palette The color group is determined by the state of the widget. A disabled widget has the QPalette::disabled() color group, a widget with keyboard focus has the QPalette::active() color group, and an inactive widget has the QPalette::inactive() color group. \sa palette */ #ifndef QT_NO_PALETTE const QColorGroup &QWidget::colorGroup() const { if ( !isEnabled() ) return palette().disabled(); else if ( !isVisible() || isActiveWindow() ) return palette().active(); else return palette().inactive(); } #endif /*! \property QWidget::palette \brief the widget's palette As long as no special palette has been set, or after unsetPalette() has been called, this is either a special palette for the widget class, the parent's palette or (if this widget is a top level widget), the default application palette. Instead of defining an entirely new palette, you can also use the \link QWidget::paletteBackgroundColor paletteBackgroundColor\endlink, \link QWidget::paletteBackgroundPixmap paletteBackgroundPixmap\endlink and \link QWidget::paletteForegroundColor paletteForegroundColor\endlink convenience properties to change a widget's background and foreground appearance only. \sa ownPalette, colorGroup(), QApplication::palette() */ #ifndef QT_NO_PALETTE void QWidget::setPalette( const QPalette &palette ) { own_palette = TRUE; if ( pal == palette ) return; QPalette old = pal; pal = palette; setBackgroundFromMode(); QEvent ev( QEvent::PaletteChange ); QApplication::sendEvent( this, &ev ); if ( children() ) { QEvent e( QEvent::ParentPaletteChange ); QObjectListIt it( *children() ); QWidget *w; while( (w=(QWidget *)it.current()) != 0 ) { ++it; if ( w->isWidgetType() ) QApplication::sendEvent( w, &e ); } } paletteChange( old ); update(); } void QWidget::unsetPalette() { // reset the palette setPalette( qt_naturalWidgetPalette( this ) ); own_palette = FALSE; } /*! \fn void QWidget::setPalette( const QPalette&, bool ) \obsolete Use setPalette( const QPalette& p ) instead. */ /*! \fn void QWidget::paletteChange( const QPalette &oldPalette ) This virtual function is called from setPalette(). \a oldPalette is the previous palette; you can get the new palette from palette(). Reimplement this function if your widget needs to know when its palette changes. \sa setPalette(), palette() */ void QWidget::paletteChange( const QPalette & ) { } #endif // QT_NO_PALETTE /*! \property QWidget::font \brief the font currently set for the widget The fontInfo() function reports the actual font that is being used by the widget. As long as no special font has been set, or after unsetFont() is called, this is either a special font for the widget class, the parent's font or (if this widget is a top level widget), the default application font. This code fragment sets a 12 point helvetica bold font: \code QFont f( "Helvetica", 12, QFont::Bold ); setFont( f ); \endcode In addition to setting the font, setFont() informs all children about the change. \sa fontChange() fontInfo() fontMetrics() ownFont() */ void QWidget::setFont( const QFont &font ) { own_font = TRUE; if ( fnt == font && fnt.d->mask == font.d->mask ) return; QFont old = fnt; fnt = font.resolve( qt_naturalWidgetFont( this ) ); #if defined(Q_WS_X11) // make sure the font set on this widget is associated with the correct screen fnt.x11SetScreen( x11Screen() ); #endif if ( children() ) { QEvent e( QEvent::ParentFontChange ); QObjectListIt it( *children() ); QWidget *w; while( (w=(QWidget *)it.current()) != 0 ) { ++it; if ( w->isWidgetType() ) QApplication::sendEvent( w, &e ); } } if ( hasFocus() ) setFontSys(); fontChange( old ); } void QWidget::unsetFont() { // reset the font setFont( qt_naturalWidgetFont( this ) ); own_font = FALSE; } /*! \fn void QWidget::setFont( const QFont&, bool ) \obsolete Use setFont(const QFont& font) instead. */ /*! \fn void QWidget::fontChange( const QFont &oldFont ) This virtual function is called from setFont(). \a oldFont is the previous font; you can get the new font from font(). Reimplement this function if your widget needs to know when its font changes. You will almost certainly need to update the widget using update(). The default implementation updates the widget including its geometry. \sa setFont(), font(), update(), updateGeometry() */ void QWidget::fontChange( const QFont & ) { update(); updateGeometry(); } /*! \fn QFontMetrics QWidget::fontMetrics() const Returns the font metrics for the widget's current font. Equivalent to QFontMetrics(widget->font()). \sa font(), fontInfo(), setFont() */ /*! \fn QFontInfo QWidget::fontInfo() const Returns the font info for the widget's current font. Equivalent to QFontInto(widget->font()). \sa font(), fontMetrics(), setFont() */ /*! \property QWidget::cursor \brief the cursor shape for this widget The mouse cursor will assume this shape when it's over this widget. See the \link Qt::CursorShape list of predefined cursor objects\endlink for a range of useful shapes. An editor widget might use an I-beam cursor: \code setCursor( IbeamCursor ); \endcode If no cursor has been set, or after a call to unsetCursor(), the parent's cursor is used. The function unsetCursor() has no effect on top-level widgets. \sa QApplication::setOverrideCursor() */ #ifndef QT_NO_CURSOR const QCursor &QWidget::cursor() const { if ( testWState(WState_OwnCursor) ) return (extra && extra->curs) ? *extra->curs : arrowCursor; else return (isTopLevel() || !parentWidget()) ? arrowCursor : parentWidget()->cursor(); } #endif #ifndef QT_NO_WIDGET_TOPEXTRA /*! \property QWidget::caption \brief the window caption (title) This property only makes sense for top-level widgets. If no caption has been set, the caption is QString::null. \sa icon() iconText() */ QString QWidget::caption() const { return extra && extra->topextra ? extra->topextra->caption : QString::null; } /*! \property QWidget::icon \brief the widget's icon This property only makes sense for top-level widgets. If no icon has been set, icon() returns 0. \sa iconText, caption, \link appicon.html Setting the Application Icon\endlink */ const QPixmap *QWidget::icon() const { return ( extra && extra->topextra ) ? extra->topextra->icon : 0; } /*! \property QWidget::iconText \brief the widget's icon text This property only makes sense for top-level widgets. If no icon text has been set, this functions returns QString::null. \sa icon, caption */ QString QWidget::iconText() const { return ( extra && extra->topextra ) ? extra->topextra->iconText : QString::null; } #endif //QT_NO_WIDGET_TOPEXTRA /*! \property QWidget::mouseTracking \brief whether mouse tracking is enabled for the widget If mouse tracking is disabled (the default), the widget only receives mouse move events when at least one mouse button is pressed while the mouse is being moved. If mouse tracking is enabled, the widget receives mouse move events even if no buttons are pressed. \sa mouseMoveEvent(), QApplication::setGlobalMouseTracking() */ /*! Sets the widget's focus proxy to widget \a w. If \a w is 0, the function resets this widget to have no focus proxy. Some widgets, such as QComboBox, can "have focus", but create a child widget to actually handle the focus. QComboBox, for example, creates a QLineEdit which handles the focus. setFocusProxy() sets the widget which will actually get focus when "this widget" gets it. If there is a focus proxy, focusPolicy(), setFocusPolicy(), setFocus() and hasFocus() all operate on the focus proxy. \sa focusProxy() */ void QWidget::setFocusProxy( QWidget * w ) { if ( !w && !extra ) return; for ( QWidget* fp = w; fp; fp = fp->focusProxy() ) { if ( fp == this ) { #if defined (QT_CHECK_STATE) qWarning( "%s (%s): already in focus proxy chain", className(), name() ); #endif return; } } createExtra(); if ( extra->focus_proxy ) { disconnect( extra->focus_proxy, SIGNAL(destroyed()), this, SLOT(focusProxyDestroyed()) ); extra->focus_proxy = 0; } if ( w ) { setFocusPolicy( w->focusPolicy() ); connect( w, SIGNAL(destroyed()), this, SLOT(focusProxyDestroyed()) ); } extra->focus_proxy = w; } /*! Returns the focus proxy, or 0 if there is no focus proxy. \sa setFocusProxy() */ QWidget * QWidget::focusProxy() const { return extra ? extra->focus_proxy : 0; } /*! \internal Internal slot used to clean up if the focus proxy is destroyed. \sa setFocusProxy() */ void QWidget::focusProxyDestroyed() { if ( extra ) extra->focus_proxy = 0; setFocusPolicy( NoFocus ); } /*! \property QWidget::focus \brief whether this widget (or its focus proxy) has the keyboard input focus Effectively equivalent to \c {qApp->focusWidget() == this}. \sa setFocus(), clearFocus(), setFocusPolicy(), QApplication::focusWidget() */ bool QWidget::hasFocus() const { const QWidget* w = this; while ( w->focusProxy() ) w = w->focusProxy(); return qApp->focusWidget() == w; } /*! Gives the keyboard input focus to this widget (or its focus proxy) if this widget or one of its parents is the \link isActiveWindow() active window\endlink. First, a focus out event is sent to the focus widget (if any) to tell it that it is about to lose the focus. Then a focus in event is sent to this widget to tell it that it just received the focus. (Nothing happens if the focus in and focus out widgets are the same.) setFocus() gives focus to a widget regardless of its focus policy, but does not clear any keyboard grab (see grabKeyboard()). Be aware that if the widget is hidden, it will not accept focus. \warning If you call setFocus() in a function which may itself be called from focusOutEvent() or focusInEvent(), you may get an infinite recursion. \sa hasFocus() clearFocus() focusInEvent() focusOutEvent() setFocusPolicy() QApplication::focusWidget() grabKeyboard() grabMouse() */ void QWidget::setFocus() { if ( !isEnabled() ) return; if ( focusProxy() ) { focusProxy()->setFocus(); return; } QFocusData * f = focusData( TRUE ); if ( f->it.current() == this && qApp->focusWidget() == this #if defined(Q_WS_WIN) && GetFocus() == winId() #endif ) return; f->it.toFirst(); while ( f->it.current() != this && !f->it.atLast() ) ++f->it; // at this point, the iterator should point to 'this'. if it // does not, 'this' must not be in the list - an error, but // perhaps possible. fix it. if ( f->it.current() != this ) { f->focusWidgets.append( this ); f->it.toLast(); } if ( isActiveWindow() ) { QWidget * prev = qApp->focus_widget; if ( prev ) { // This part is never executed when Q_WS_X11? Preceding XFocusOut // had already reset focus_widget when received XFocusIn // Don't reset input context explicitly here. Whether reset or not // when focusing out is a responsibility of input methods. For // example, Japanese input context should not be reset here. The // context sometimes contains a whole paragraph and has minutes of // lifetime different to ephemeral one in other languages. The // input context should be survived until focused again. So we // delegate the responsibility to input context via // unfocusInputContext(). if ( prev != this && prev->isInputMethodEnabled() ) { #if 0 prev->resetInputContext(); #else prev->unfocusInputContext(); #endif } } #if defined(Q_WS_WIN) else { QInputContext::endComposition(); } #endif qApp->focus_widget = this; if( isInputMethodEnabled() ) focusInputContext(); #if defined(Q_WS_WIN) if ( !topLevelWidget()->isPopup() ) SetFocus( winId() ); else { #endif #if defined(QT_ACCESSIBILITY_SUPPORT) QAccessible::updateAccessibility( this, 0, QAccessible::Focus ); #endif #if defined(Q_WS_WIN) } #endif if ( prev != this ) { if ( prev ) { QFocusEvent out( QEvent::FocusOut ); QApplication::sendEvent( prev, &out ); } if ( qApp->focus_widget == this ) { QFocusEvent in( QEvent::FocusIn ); QApplication::sendEvent( this, &in ); } } } } /*! Takes keyboard input focus from the widget. If the widget has active focus, a \link focusOutEvent() focus out event\endlink is sent to this widget to tell it that it is about to lose the focus. This widget must enable focus setting in order to get the keyboard input focus, i.e. it must call setFocusPolicy(). \sa hasFocus(), setFocus(), focusInEvent(), focusOutEvent(), setFocusPolicy(), QApplication::focusWidget() */ void QWidget::clearFocus() { if ( focusProxy() ) { focusProxy()->clearFocus(); return; } else if ( hasFocus() ) { #if !defined(Q_WS_X11) resetInputContext(); #else unfocusInputContext(); #endif QWidget* w = qApp->focusWidget(); // clear active focus qApp->focus_widget = 0; QFocusEvent out( QEvent::FocusOut ); QApplication::sendEvent( w, &out ); #if defined(Q_WS_WIN) if ( !isPopup() && GetFocus() == winId() ) SetFocus( 0 ); else { #endif #if defined(QT_ACCESSIBILITY_SUPPORT) QAccessible::updateAccessibility( this, 0, QAccessible::Focus ); #endif #if defined(Q_WS_WIN) } #endif } } /*! Finds a new widget to give the keyboard focus to, as appropriate for Tab and Shift+Tab, and returns TRUE if is can find a new widget and FALSE if it can't, If \a next is TRUE, this function searches "forwards", if \a next is FALSE, it searches "backwards". Sometimes, you will want to reimplement this function. For example, a web browser might reimplement it to move its "current active link" forwards or backwards, and call QWidget::focusNextPrevChild() only when it reaches the last or first link on the "page". Child widgets call focusNextPrevChild() on their parent widgets, but only the top-level widget decides where to redirect focus. By overriding this method for an object, you thus gain control of focus traversal for all child widgets. \warning QScrollView uses it own logic for this function, which does the right thing in most cases. But if you are using a QScrollView and want complete control of the focus chain you'll need to override QScrollView::focusNextPrevChild() and your top-level widgets' focusNextPrevChild() functions. \sa focusData() */ bool QWidget::focusNextPrevChild( bool next ) { QWidget* p = parentWidget(); if ( !isTopLevel() && p ) return p->focusNextPrevChild(next); QFocusData *f = focusData( TRUE ); QWidget *startingPoint = f->it.current(); QWidget *candidate = 0; QWidget *w = next ? f->focusWidgets.last() : f->focusWidgets.first(); extern bool qt_tab_all_widgets; uint focus_flag = qt_tab_all_widgets ? TabFocus : StrongFocus; do { if ( w && w != startingPoint && ( ( w->focusPolicy() & focus_flag ) == focus_flag ) && !w->focusProxy() && w->isVisibleTo(this) && w->isEnabled()) candidate = w; w = next ? f->focusWidgets.prev() : f->focusWidgets.next(); } while( w && !(candidate && w==startingPoint) ); if ( !candidate ) return FALSE; candidate->setFocus(); return TRUE; } /*! Returns the focus widget in this widget's window. This is not the same as QApplication::focusWidget(), which returns the focus widget in the currently active window. */ QWidget *QWidget::focusWidget() const { QWidget *that = (QWidget *)this; // mutable QFocusData *f = that->focusData( FALSE ); if ( f && f->focusWidgets.count() && f->it.current() == 0 ) f->it.toFirst(); return ( f && f->it.current() ) ? f->it.current() : 0; } /*! Returns the focus data for this widget's top-level widget. Focus data always belongs to the top-level widget. The focus data list contains all the widgets in this top-level widget that can accept focus, in tab order. An iterator points to the current focus widget (focusWidget() returns a pointer to this widget). This information is useful for implementing advanced versions of focusNextPrevChild(). */ QFocusData * QWidget::focusData() { return focusData( TRUE ); } /*! \internal Internal function which lets us ask for the focus data, creating it if it doesn't exist and \a create is TRUE. */ QFocusData * QWidget::focusData( bool create ) { QWidget * tlw = topLevelWidget(); QWExtra * ed = tlw->extraData(); if ( !ed || !ed->topextra ) { if ( !create ) return 0; tlw->createTLExtra(); ed = tlw->extraData(); } if ( create && !ed->topextra->focusData ) ed->topextra->focusData = new QFocusData; return ed->topextra->focusData; } /*! \property QWidget::inputMethodEnabled \brief enables or disables the use of input methods for this widget. Most Widgets (as eg. buttons) that do not handle text input should have the input method disabled if they have focus. This is the default. If a widget handles text input it should set this property to TRUE. */ void QWidget::setInputMethodEnabled( bool b ) { im_enabled = b; #ifdef Q_WS_WIN QInputContext::enable( this, im_enabled & !((bool)testWState(WState_Disabled)) ); #endif } /*! Enables key event compression, if \a compress is TRUE, and disables it if \a compress is FALSE. Key compression is off by default (except for QLineEdit and QTextEdit), so widgets receive one key press event for each key press (or more, since autorepeat is usually on). If you turn it on and your program doesn't keep up with key input, Qt may try to compress key events so that more than one character can be processed in each event. For example, a word processor widget might receive 2, 3 or more characters in each QKeyEvent::text(), if the layout recalculation takes too long for the CPU. If a widget supports multiple character unicode input, it is always safe to turn the compression on. Qt performs key event compression only for printable characters. Modifier keys, cursor movement keys, function keys and miscellaneous action keys (e.g. Escape, Enter, Backspace, PrintScreen) will stop key event compression, even if there are more compressible key events available. Not all platforms support this compression, in which case turning it on will have no effect. \sa QKeyEvent::text(); */ void QWidget::setKeyCompression(bool compress) { if ( compress ) setWState( WState_CompressKeys ); else clearWState( WState_CompressKeys ); } /*! \property QWidget::isActiveWindow \brief whether this widget is the active window The active window is the window that contains the widget that has keyboard focus. When popup windows are visible, this property is TRUE for both the active window \e and for the popup. \sa setActiveWindow(), QApplication::activeWindow() */ bool QWidget::isActiveWindow() const { QWidget *tlw = topLevelWidget(); if(testWFlags(WSubWindow) && parentWidget()) tlw = parentWidget()->topLevelWidget(); if(tlw == qApp->activeWindow() || ( isVisible() && tlw->isPopup() )) return TRUE; #ifndef QT_NO_STYLE if(style().styleHint(QStyle::SH_Widget_ShareActivation, this )) { if((tlw->isDialog() || (tlw->testWFlags(Qt::WStyle_Tool) && !tlw->isPopup())) && !tlw->testWFlags(Qt::WShowModal) && (!tlw->parentWidget() || tlw->parentWidget()->isActiveWindow())) return TRUE; QWidget *w = qApp->activeWindow(); if( !testWFlags(WSubWindow) && w && w->testWFlags(WSubWindow) && w->parentWidget()->topLevelWidget() == tlw) return TRUE; while(w && (tlw->isDialog() || tlw->testWFlags(Qt::WStyle_Tool)) && !w->testWFlags(Qt::WShowModal) && w->parentWidget()) { w = w->parentWidget()->topLevelWidget(); if( w == tlw ) return TRUE; } } #endif #if defined(Q_WS_WIN32) HWND parent = tlw->winId(); HWND topparent = GetActiveWindow(); while ( parent ) { parent = ::GetParent( parent ); if ( parent && parent == topparent ) return TRUE; } #endif return FALSE; } /*! Moves the \a second widget around the ring of focus widgets so that keyboard focus moves from the \a first widget to the \a second widget when the Tab key is pressed. Note that since the tab order of the \a second widget is changed, you should order a chain like this: \code setTabOrder( a, b ); // a to b setTabOrder( b, c ); // a to b to c setTabOrder( c, d ); // a to b to c to d \endcode \e not like this: \code setTabOrder( c, d ); // c to d WRONG setTabOrder( a, b ); // a to b AND c to d setTabOrder( b, c ); // a to b to c, but not c to d \endcode If \a first or \a second has a focus proxy, setTabOrder() correctly substitutes the proxy. \sa setFocusPolicy(), setFocusProxy() */ void QWidget::setTabOrder( QWidget* first, QWidget *second ) { if ( !first || !second || first->focusPolicy() == NoFocus || second->focusPolicy() == NoFocus ) return; // If first is redirected, set first to the last child of first // that can take keyboard focus so that second is inserted after // that last child, and the focus order within first is (more // likely to be) preserved. if ( first->focusProxy() ) { QObjectList *l = first->queryList( "QWidget" ); if ( l && l->count() ) { QObjectListIt it(*l); it.toLast(); while (it.current()) { if (((QWidget*)it.current())->topLevelWidget() == first->topLevelWidget()) { first = (QWidget*)it.current(); if (first->focusPolicy() != NoFocus) break; } --it; } } delete l; } while ( first->focusProxy() ) first = first->focusProxy(); while ( second->focusProxy() ) second = second->focusProxy(); QFocusData *f = first->focusData( TRUE ); bool focusThere = (f->it.current() == second ); f->focusWidgets.removeRef( second ); if ( f->focusWidgets.findRef( first ) >= 0 ) f->focusWidgets.insert( f->focusWidgets.at() + 1, second ); else f->focusWidgets.append( second ); if ( focusThere ) { // reset iterator so tab will work appropriately f->it.toFirst(); while( f->it.current() && f->it.current() != second ) ++f->it; } } /*!\internal Moves the relevant subwidgets of this widget from the \a oldtlw's tab chain to that of the new parent, if there's anything to move and we're really moving This function is called from QWidget::reparent() *after* the widget has been reparented. \sa reparent() */ void QWidget::reparentFocusWidgets( QWidget * oldtlw ) { if ( oldtlw == topLevelWidget() ) return; // nothing to do QFocusData * from = oldtlw ? oldtlw->topData()->focusData : 0; QFocusData * to; to = focusData(); if ( from ) { from->focusWidgets.first(); do { QWidget * pw = from->focusWidgets.current(); while( pw && pw != this ) pw = pw->parentWidget(); if ( pw == this ) { QWidget * w = from->focusWidgets.take(); if ( w == from->it.current() ) // probably best to clear keyboard focus, or // the user might become rather confused w->clearFocus(); if ( !isTopLevel() ) to->focusWidgets.append( w ); } else { from->focusWidgets.next(); } } while( from->focusWidgets.current() ); } if ( to->focusWidgets.findRef(this) < 0 ) to->focusWidgets.append( this ); if ( !isTopLevel() && extra && extra->topextra && extra->topextra->focusData ) { // this widget is no longer a top-level widget, so get rid // of old focus data delete extra->topextra->focusData; extra->topextra->focusData = 0; } } /*! \fn void QWidget::recreate( QWidget *parent, WFlags f, const QPoint & p, bool showIt ) \obsolete This method is provided to aid porting from Qt 1.0 to 2.0. It has been renamed reparent() in Qt 2.0. */ /*! \property QWidget::frameSize \brief the size of the widget including any window frame */ QSize QWidget::frameSize() const { if ( isTopLevel() && !isPopup() ) { if ( fstrut_dirty ) updateFrameStrut(); QWidget *that = (QWidget *) this; QTLWExtra *top = that->topData(); return QSize( crect.width() + top->fleft + top->fright, crect.height() + top->ftop + top->fbottom ); } return crect.size(); } /*! \internal Recursive function that updates \a widget and all its children, if they have some parent background origin. */ static void qt_update_bg_recursive( QWidget *widget ) { if ( !widget || widget->isHidden() || widget->backgroundOrigin() == QWidget::WidgetOrigin || !widget->backgroundPixmap() ) return; const QObjectList *lst = widget->children(); if ( lst ) { QObjectListIterator it( *lst ); QWidget *widget; while ( (widget = (QWidget*)it.current()) ) { ++it; if ( widget->isWidgetType() && !widget->isHidden() && !widget->isTopLevel() && !widget->testWFlags(Qt::WSubWindow) ) qt_update_bg_recursive( widget ); } } QApplication::postEvent( widget, new QPaintEvent( widget->clipRegion(), !widget->testWFlags(Qt::WRepaintNoErase) ) ); } /*! \overload This corresponds to move( QPoint(\a x, \a y) ). */ void QWidget::move( int x, int y ) { QPoint oldp(pos()); internalSetGeometry( x + geometry().x() - QWidget::x(), y + geometry().y() - QWidget::y(), width(), height(), TRUE ); if ( isVisible() && oldp != pos() ) qt_update_bg_recursive( this ); } /*! \overload This corresponds to resize( QSize(\a w, \a h) ). */ void QWidget::resize( int w, int h ) { internalSetGeometry( geometry().x(), geometry().y(), w, h, FALSE ); setWState( WState_Resized ); } /*! \overload This corresponds to setGeometry( QRect(\a x, \a y, \a w, \a h) ). */ void QWidget::setGeometry( int x, int y, int w, int h ) { QPoint oldp( pos( )); internalSetGeometry( x, y, w, h, TRUE ); setWState( WState_Resized ); if ( isVisible() && oldp != pos() ) qt_update_bg_recursive( this ); } /*! \property QWidget::focusEnabled \brief whether the widget accepts keyboard focus Keyboard focus is initially disabled (i.e. focusPolicy() == \c QWidget::NoFocus). You must enable keyboard focus for a widget if it processes keyboard events. This is normally done from the widget's constructor. For instance, the QLineEdit constructor calls setFocusPolicy(QWidget::StrongFocus). \sa setFocusPolicy(), focusInEvent(), focusOutEvent(), keyPressEvent(), keyReleaseEvent(), isEnabled() */ /*! \enum QWidget::FocusPolicy This enum type defines the various policies a widget can have with respect to acquiring keyboard focus. \value TabFocus the widget accepts focus by tabbing. \value ClickFocus the widget accepts focus by clicking. \value StrongFocus the widget accepts focus by both tabbing and clicking. On Mac OS X this will also be indicate that the widget accepts tab focus when in 'Text/List focus mode'. \value WheelFocus like StrongFocus plus the widget accepts focus by using the mouse wheel. \value NoFocus the widget does not accept focus. */ /*! \property QWidget::focusPolicy \brief the way the widget accepts keyboard focus The policy is \c QWidget::TabFocus if the widget accepts keyboard focus by tabbing, \c QWidget::ClickFocus if the widget accepts focus by clicking, \c QWidget::StrongFocus if it accepts both, and \c QWidget::NoFocus (the default) if it does not accept focus at all. You must enable keyboard focus for a widget if it processes keyboard events. This is normally done from the widget's constructor. For instance, the QLineEdit constructor calls setFocusPolicy(QWidget::StrongFocus). \sa focusEnabled, focusInEvent(), focusOutEvent(), keyPressEvent(), keyReleaseEvent(), enabled */ void QWidget::setFocusPolicy( FocusPolicy policy ) { if ( focusProxy() ) focusProxy()->setFocusPolicy( policy ); if ( policy != NoFocus ) { QFocusData * f = focusData( TRUE ); if ( f->focusWidgets.findRef( this ) < 0 ) f->focusWidgets.append( this ); } focus_policy = (uint) policy; } /*! \property QWidget::updatesEnabled \brief whether updates are enabled Calling update() and repaint() has no effect if updates are disabled. Paint events from the window system are processed normally even if updates are disabled. setUpdatesEnabled() is normally used to disable updates for a short period of time, for instance to avoid screen flicker during large changes. Example: \code setUpdatesEnabled( FALSE ); bigVisualChanges(); setUpdatesEnabled( TRUE ); repaint(); \endcode \sa update(), repaint(), paintEvent() */ void QWidget::setUpdatesEnabled( bool enable ) { if ( enable ) clearWState( WState_BlockUpdates ); else setWState( WState_BlockUpdates ); } /*! Shows the widget and its child widgets. If its size or position has changed, Qt guarantees that a widget gets move and resize events just before it is shown. You almost never have to reimplement this function. If you need to change some settings before a widget is shown, use showEvent() instead. If you need to do some delayed initialization use polish(). \sa showEvent(), hide(), showMinimized(), showMaximized(), showNormal(), isVisible(), polish() */ void QWidget::show() { if ( testWState(WState_Visible) ) return; bool wasHidden = isHidden(); bool postLayoutHint = !isTopLevel() && wasHidden; clearWState( WState_ForceHide | WState_CreatedHidden ); if ( !isTopLevel() && !parentWidget()->isVisible() ) { // we should become visible, but one of our ancestors is // explicitly hidden. Since we cleared the ForceHide flag, our // immediate parent will call show() on us again during its // own processing of show(). if ( wasHidden ) { QEvent showToParentEvent( QEvent::ShowToParent ); QApplication::sendEvent( this, &showToParentEvent ); } if ( postLayoutHint ) QApplication::postEvent( parentWidget(), new QEvent(QEvent::LayoutHint) ); return; } in_show = TRUE; // set qws recursion watch QApplication::sendPostedEvents( this, QEvent::ChildInserted ); uint state = isTopLevel() ? windowState() : 0; #ifndef Q_OS_TEMP if ( isTopLevel() && !testWState( WState_Resized ) ) { // do this before sending the posted resize events. Otherwise // the layout would catch the resize event and may expand the // minimum size. QSize s = qt_naturalWidgetSize( this ); if ( !s.isEmpty() ) resize( s ); } #endif // Q_OS_TEMP QApplication::sendPostedEvents( this, QEvent::Move ); QApplication::sendPostedEvents( this, QEvent::Resize ); // the resizing and layouting might have changed the window state if (isTopLevel() && windowState() != state) setWindowState(state); setWState( WState_Visible ); if ( parentWidget() ) QApplication::sendPostedEvents( parentWidget(), QEvent::ChildInserted ); if ( extra ) { int w = crect.width(); int h = crect.height(); if ( w < extra->minw || h < extra->minh || w > extra->maxw || h > extra->maxh ) { w = QMAX( extra->minw, QMIN( w, extra->maxw )); h = QMAX( extra->minh, QMIN( h, extra->maxh )); resize( w, h ); // deferred resize } } if ( testWFlags(WStyle_Tool) || isPopup() ) { raise(); } else if ( testWFlags(WType_TopLevel) ) { while ( QApplication::activePopupWidget() ) { if ( !QApplication::activePopupWidget()->close() ) break; } } if ( !testWState(WState_Polished) ) polish(); showChildren( FALSE ); if ( postLayoutHint ) QApplication::postEvent( parentWidget(), new QEvent(QEvent::LayoutHint) ); // Required for Mac, not sure whether we should always do that if( isTopLevel() ) QApplication::sendPostedEvents(0, QEvent::LayoutHint); // On Windows, show the popup now so that our own focus handling // stores the correct old focus widget even if it's stolen in the showevent #if defined(Q_WS_WIN) if ( testWFlags(WType_Popup) ) qApp->openPopup( this ); #endif QShowEvent showEvent; QApplication::sendEvent( this, &showEvent ); if ( testWFlags(WShowModal) ) { // qt_enter_modal *before* show, otherwise the initial // stacking might be wrong qt_enter_modal( this ); } // do not show the window directly, but post a show-window request // to reduce flicker with widgets in layouts if ( postLayoutHint ) QApplication::postEvent( this, new QEvent( QEvent::ShowWindowRequest ) ); else showWindow(); #if !defined(Q_WS_WIN) if ( testWFlags(WType_Popup) ) qApp->openPopup( this ); #endif #if defined(QT_ACCESSIBILITY_SUPPORT) QAccessible::updateAccessibility( this, 0, QAccessible::ObjectShow ); #endif in_show = FALSE; // reset qws recursion watch } /*! \fn void QWidget::iconify() \obsolete */ /*! Hides the widget. You almost never have to reimplement this function. If you need to do something after a widget is hidden, use hideEvent() instead. \sa hideEvent(), isHidden(), show(), showMinimized(), isVisible(), close() */ void QWidget::hide() { clearWState( WState_CreatedHidden ); if ( testWState(WState_ForceHide) ) return; setWState( WState_ForceHide ); if ( testWFlags(WType_Popup) ) qApp->closePopup( this ); // Move test modal here. Otherwise, a modal dialog could get // destroyed and we lose all access to its parent because we haven't // left modality. (Eg. modal Progress Dialog) if ( testWFlags(WShowModal) ) qt_leave_modal( this ); #if defined(Q_WS_WIN) if ( isTopLevel() && !isPopup() && parentWidget() && isActiveWindow() ) parentWidget()->setActiveWindow(); // Activate parent #endif hideWindow(); if ( testWState(WState_Visible) ) { clearWState( WState_Visible ); // next bit tries to move the focus if the focus widget is now // hidden. if ( qApp && qApp->focusWidget() == this ) focusNextPrevChild( TRUE ); QHideEvent hideEvent; QApplication::sendEvent( this, &hideEvent ); hideChildren( FALSE ); #if defined(QT_ACCESSIBILITY_SUPPORT) QAccessible::updateAccessibility( this, 0, QAccessible::ObjectHide ); #endif } else { QEvent hideToParentEvent( QEvent::HideToParent ); QApplication::sendEvent( this, &hideToParentEvent ); } // post layout hint for non toplevels. The parent widget check is // necessary since the function is called in the destructor if ( !isTopLevel() && parentWidget() ) QApplication::postEvent( parentWidget(), new QEvent( QEvent::LayoutHint) ); } void QWidget::setShown( bool show ) { if ( show ) this->show(); else hide(); } void QWidget::setHidden( bool hide ) { if ( hide ) this->hide(); else show(); } void QWidget::showChildren( bool spontaneous ) { if ( children() ) { QObjectListIt it(*children()); register QObject *object; QWidget *widget; while ( it ) { object = it.current(); ++it; if ( object->isWidgetType() ) { widget = (QWidget*)object; if ( !widget->isTopLevel() && widget->isShown() ) { if ( spontaneous ) { widget->showChildren( spontaneous ); QShowEvent e; QApplication::sendSpontaneousEvent( widget, &e ); } else { widget->show(); } } } } } } void QWidget::hideChildren( bool spontaneous ) { if ( children() ) { QObjectListIt it(*children()); register QObject *object; QWidget *widget; while ( it ) { object = it.current(); ++it; if ( object->isWidgetType() ) { widget = (QWidget*)object; if ( !widget->isTopLevel() && widget->isShown() ) { if ( !spontaneous ) widget->clearWState( WState_Visible ); widget->hideChildren( spontaneous ); QHideEvent e; if ( spontaneous ) QApplication::sendSpontaneousEvent( widget, &e ); else QApplication::sendEvent( widget, &e ); } } } } } /*! Delayed initialization of a widget. This function will be called \e after a widget has been fully created and \e before it is shown the very first time. Polishing is useful for final initialization which depends on having an instantiated widget. This is something a constructor cannot guarantee since the initialization of the subclasses might not be finished. After this function, the widget has a proper font and palette and QApplication::polish() has been called. Remember to call QWidget's implementation first when reimplementing this function to ensure that your program does not end up in infinite recursion. \sa constPolish(), QApplication::polish() */ void QWidget::polish() { #ifndef QT_NO_WIDGET_TOPEXTRA if ( isTopLevel() ) { const QPixmap *pm = icon(); if ( !pm || pm->isNull() ) { QWidget *mw = (QWidget *)parent(); pm = mw ? mw->icon() : 0; if ( pm && !pm->isNull() ) setIcon( *pm ); else { mw = mw ? mw->topLevelWidget() : 0; pm = mw ? mw->icon() : 0; if ( pm && !pm->isNull() ) setIcon( *pm ); else { mw = qApp ? qApp->mainWidget() : 0; pm = mw ? mw->icon() : 0; if ( pm && !pm->isNull() ) setIcon( *pm ); } } } } #endif if ( !testWState(WState_Polished) ) { if ( ! own_font && ! QApplication::font( this ).isCopyOf( QApplication::font() ) ) unsetFont(); #ifndef QT_NO_PALETTE if ( ! own_palette && ! QApplication::palette( this ).isCopyOf( QApplication::palette() ) ) unsetPalette(); #endif setWState(WState_Polished); qApp->polish( this ); QApplication::sendPostedEvents( this, QEvent::ChildInserted ); } } /*! \fn void QWidget::constPolish() const Ensures that the widget is properly initialized by calling polish(). Call constPolish() from functions like sizeHint() that depends on the widget being initialized, and that may be called before show(). \warning Do not call constPolish() on a widget from inside that widget's constructor. \sa polish() */ /*! \overload Closes this widget. Returns TRUE if the widget was closed; otherwise returns FALSE. If \a alsoDelete is TRUE or the widget has the \c WDestructiveClose widget flag, the widget is also deleted. The widget can prevent itself from being closed by rejecting the \l QCloseEvent it gets. A close events is delivered to the widget no matter if the widget is visible or not. The QApplication::lastWindowClosed() signal is emitted when the last visible top level widget is closed. Note that closing the \l QApplication::mainWidget() terminates the application. \sa closeEvent(), QCloseEvent, hide(), QApplication::quit(), QApplication::setMainWidget(), QApplication::lastWindowClosed() */ bool QWidget::close( bool alsoDelete ) { if ( is_closing ) return TRUE; is_closing = 1; WId id = winId(); bool isMain = qApp->mainWidget() == this; bool checkLastWindowClosed = isTopLevel() && !isPopup(); bool deleted = FALSE; QCloseEvent e; QApplication::sendEvent( this, &e ); deleted = !QWidget::find(id); if ( !deleted && !e.isAccepted() ) { is_closing = 0; return FALSE; } if ( !deleted && !isHidden() ) hide(); if ( checkLastWindowClosed && qApp->receivers(SIGNAL(lastWindowClosed())) ) { /* if there is no non-withdrawn top level window left (except the desktop, popups, or dialogs with parents), we emit the lastWindowClosed signal */ QWidgetList *list = qApp->topLevelWidgets(); QWidget *widget = list->first(); while ( widget ) { if ( !widget->isHidden() && !widget->isDesktop() && !widget->isPopup() && (!widget->isDialog() || !widget->parentWidget())) break; widget = list->next(); } delete list; if ( widget == 0 ) emit qApp->lastWindowClosed(); } if ( isMain ) qApp->quit(); if ( deleted ) return TRUE; is_closing = 0; if ( alsoDelete ) delete this; else if ( testWFlags(WDestructiveClose) ) { clearWFlags(WDestructiveClose); deleteLater(); } return TRUE; } /*! \fn bool QWidget::close() Closes this widget. Returns TRUE if the widget was closed; otherwise returns FALSE. First it sends the widget a QCloseEvent. The widget is \link hide() hidden\endlink if it \link QCloseEvent::accept() accepts\endlink the close event. The default implementation of QWidget::closeEvent() accepts the close event. The \l QApplication::lastWindowClosed() signal is emitted when the last visible top level widget is closed. */ /*! \property QWidget::visible \brief whether the widget is visible Calling show() sets the widget to visible status if all its parent widgets up to the top-level widget are visible. If an ancestor is not visible, the widget won't become visible until all its ancestors are shown. Calling hide() hides a widget explicitly. An explicitly hidden widget will never become visible, even if all its ancestors become visible, unless you show it. A widget receives show and hide events when its visibility status changes. Between a hide and a show event, there is no need to waste CPU cycles preparing or displaying information to the user. A video application, for example, might simply stop generating new frames. A widget that happens to be obscured by other windows on the screen is considered to be visible. The same applies to iconified top-level widgets and windows that exist on another virtual desktop (on platforms that support this concept). A widget receives spontaneous show and hide events when its mapping status is changed by the window system, e.g. a spontaneous hide event when the user minimizes the window, and a spontaneous show event when the window is restored again. \sa show(), hide(), isHidden(), isVisibleTo(), isMinimized(), showEvent(), hideEvent() */ /*! Returns TRUE if this widget would become visible if \a ancestor is shown; otherwise returns FALSE. The TRUE case occurs if neither the widget itself nor any parent up to but excluding \a ancestor has been explicitly hidden. This function will still return TRUE if the widget is obscured by other windows on the screen, but could be physically visible if it or they were to be moved. isVisibleTo(0) is identical to isVisible(). \sa show() hide() isVisible() */ bool QWidget::isVisibleTo(QWidget* ancestor) const { if ( !ancestor ) return isVisible(); const QWidget * w = this; while ( w && w->isShown() && !w->isTopLevel() && w->parentWidget() && w->parentWidget() != ancestor ) w = w->parentWidget(); return w->isShown(); } /*! \fn bool QWidget::isVisibleToTLW() const \obsolete This function is deprecated. It is equivalent to isVisible() */ /*! \property QWidget::hidden \brief whether the widget is explicitly hidden If FALSE, the widget is visible or would become visible if all its ancestors became visible. \sa hide(), show(), isVisible(), isVisibleTo(), shown */ /*! \property QWidget::shown \brief whether the widget is shown If TRUE, the widget is visible or would become visible if all its ancestors became visible. \sa hide(), show(), isVisible(), isVisibleTo(), hidden */ /*! \property QWidget::visibleRect \brief the visible rectangle \obsolete No longer necessary, you can simply call repaint(). If you do not need the rectangle for repaint(), use clipRegion() instead. */ QRect QWidget::visibleRect() const { QRect r = rect(); const QWidget * w = this; int ox = 0; int oy = 0; while ( w && w->isVisible() && !w->isTopLevel() && w->parentWidget() ) { ox -= w->x(); oy -= w->y(); w = w->parentWidget(); r = r.intersect( QRect( ox, oy, w->width(), w->height() ) ); } if ( !w->isVisible() ) return QRect(); return r; } /*! Returns the unobscured region where paint events can occur. For visible widgets, this is an approximation of the area not covered by other widgets; otherwise, this is an empty region. The repaint() function calls this function if necessary, so in general you do not need to call it. */ QRegion QWidget::clipRegion() const { return visibleRect(); } /*! Adjusts the size of the widget to fit the contents. Uses sizeHint() if valid (i.e if the size hint's width and height are \>= 0), otherwise sets the size to the children rectangle (the union of all child widget geometries). \sa sizeHint(), childrenRect() */ void QWidget::adjustSize() { QApplication::sendPostedEvents( 0, QEvent::ChildInserted ); QApplication::sendPostedEvents( 0, QEvent::LayoutHint ); if ( !testWState(WState_Polished) ) polish(); QSize s = sizeHint(); if ( isTopLevel() ) { #if defined(Q_WS_X11) QRect screen = QApplication::desktop()->screenGeometry( x11Screen() ); #else // all others QRect screen = QApplication::desktop()->screenGeometry( pos() ); #endif #ifndef QT_NO_LAYOUT if ( layout() ) { if ( layout()->hasHeightForWidth() ) { s = s.boundedTo( screen.size() ); s.setHeight( layout()->totalHeightForWidth( s.width() ) ); } } else #endif { if ( sizePolicy().hasHeightForWidth() ) { s = s.boundedTo( screen.size() ); s.setHeight( heightForWidth( s.width() ) ); } } } if ( s.isValid() ) { resize( s ); return; } QRect r = childrenRect(); // get children rectangle if ( r.isNull() ) // probably no widgets return; resize( r.width() + 2 * r.x(), r.height() + 2 * r.y() ); } /*! \property QWidget::sizeHint \brief the recommended size for the widget If the value of this property is an invalid size, no size is recommended. The default implementation of sizeHint() returns an invalid size if there is no layout for this widget, and returns the layout's preferred size otherwise. \sa QSize::isValid(), minimumSizeHint(), sizePolicy(), setMinimumSize(), updateGeometry() */ QSize QWidget::sizeHint() const { #ifndef QT_NO_LAYOUT if ( layout() ) return layout()->totalSizeHint(); #endif return QSize( -1, -1 ); } /*! \property QWidget::minimumSizeHint \brief the recommended minimum size for the widget If the value of this property is an invalid size, no minimum size is recommended. The default implementation of minimumSizeHint() returns an invalid size if there is no layout for this widget, and returns the layout's minimum size otherwise. Most built-in widgets reimplement minimumSizeHint(). \l QLayout will never resize a widget to a size smaller than minimumSizeHint. \sa QSize::isValid(), resize(), setMinimumSize(), sizePolicy() */ QSize QWidget::minimumSizeHint() const { #ifndef QT_NO_LAYOUT if ( layout() ) return layout()->totalMinimumSize(); #endif return QSize( -1, -1 ); } /*! \fn QWidget *QWidget::parentWidget( bool sameWindow ) const Returns the parent of this widget, or 0 if it does not have any parent widget. If \a sameWindow is TRUE and the widget is top level returns 0; otherwise returns the widget's parent. */ /*! \fn WFlags QWidget::testWFlags( WFlags f ) const Returns the bitwise AND of the widget flags and \a f. Widget flags are a combination of \l{Qt::WidgetFlags}. If you want to test for the presence of multiple flags (or composite flags such as \c WStyle_Splash), test the return value for equality against the argument. For example: \code int flags = WStyle_Tool | WStyle_NoBorder; if ( testWFlags(flags) ) ... // WStyle_Tool or WStyle_NoBorder or both are set if ( testWFlags(flags) == flags ) ... // both WStyle_Tool and WStyle_NoBorder are set \endcode \sa getWFlags(), setWFlags(), clearWFlags() */ /*! \fn WState QWidget::testWState( WState s ) const \internal Returns the bitwise AND of the widget states and \a s. */ /*! \fn uint QWidget::getWState() const \internal Returns the current widget state. */ /*! \fn void QWidget::clearWState( uint n ) \internal Clears the widgets states \a n. */ /*! \fn void QWidget::setWState( uint n ) \internal Sets the widgets states \a n. */ /***************************************************************************** QWidget event handling *****************************************************************************/ /*! This is the main event handler; it handles event \a e. You can reimplement this function in a subclass, but we recommend using one of the specialized event handlers instead. The main event handler first passes an event through all \link QObject::installEventFilter() event filters\endlink that have been installed. If none of the filters intercept the event, it calls one of the specialized event handlers. Key press and release events are treated differently from other events. event() checks for Tab and Shift+Tab and tries to move the focus appropriately. If there is no widget to move the focus to (or the key press is not Tab or Shift+Tab), event() calls keyPressEvent(). This function returns TRUE if it is able to pass the event over to someone (i.e. someone wanted the event); otherwise returns FALSE. \sa closeEvent(), focusInEvent(), focusOutEvent(), enterEvent(), keyPressEvent(), keyReleaseEvent(), leaveEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), mousePressEvent(), mouseReleaseEvent(), moveEvent(), paintEvent(), resizeEvent(), QObject::event(), QObject::timerEvent() */ bool QWidget::event( QEvent *e ) { if ( QObject::event( e ) ) return TRUE; switch ( e->type() ) { case QEvent::MouseMove: mouseMoveEvent( (QMouseEvent*)e ); if ( ! ((QMouseEvent*)e)->isAccepted() ) return FALSE; break; case QEvent::MouseButtonPress: // Don't reset input context here. Whether reset or not is // a responsibility of input method. reset() will be // called by mouseHandler() of input method if necessary // via mousePressEvent() of text widgets. #if 0 resetInputContext(); #endif mousePressEvent( (QMouseEvent*)e ); if ( ! ((QMouseEvent*)e)->isAccepted() ) return FALSE; break; case QEvent::MouseButtonRelease: mouseReleaseEvent( (QMouseEvent*)e ); if ( ! ((QMouseEvent*)e)->isAccepted() ) return FALSE; break; case QEvent::MouseButtonDblClick: mouseDoubleClickEvent( (QMouseEvent*)e ); if ( ! ((QMouseEvent*)e)->isAccepted() ) return FALSE; break; #ifndef QT_NO_WHEELEVENT case QEvent::Wheel: wheelEvent( (QWheelEvent*)e ); if ( ! ((QWheelEvent*)e)->isAccepted() ) return FALSE; break; #endif case QEvent::TabletMove: case QEvent::TabletPress: case QEvent::TabletRelease: tabletEvent( (QTabletEvent*)e ); if ( ! ((QTabletEvent*)e)->isAccepted() ) return FALSE; break; case QEvent::Accel: ((QKeyEvent*)e)->ignore(); return FALSE; case QEvent::KeyPress: { QKeyEvent *k = (QKeyEvent *)e; bool res = FALSE; if ( !(k->state() & ControlButton || k->state() & AltButton) ) { if ( k->key() == Key_Backtab || (k->key() == Key_Tab && (k->state() & ShiftButton)) ) { QFocusEvent::setReason( QFocusEvent::Backtab ); res = focusNextPrevChild( FALSE ); QFocusEvent::resetReason(); } else if ( k->key() == Key_Tab ) { QFocusEvent::setReason( QFocusEvent::Tab ); res = focusNextPrevChild( TRUE ); QFocusEvent::resetReason(); } if ( res ) break; } keyPressEvent( k ); if ( !k->isAccepted() ) return FALSE; } break; case QEvent::KeyRelease: keyReleaseEvent( (QKeyEvent*)e ); if ( ! ((QKeyEvent*)e)->isAccepted() ) return FALSE; break; case QEvent::IMStart: { QIMEvent *i = (QIMEvent *) e; imStartEvent(i); if (! i->isAccepted()) return FALSE; } break; case QEvent::IMCompose: { QIMEvent *i = (QIMEvent *) e; imComposeEvent(i); if (! i->isAccepted()) return FALSE; } break; case QEvent::IMEnd: { QIMEvent *i = (QIMEvent *) e; imEndEvent(i); if (! i->isAccepted()) return FALSE; } break; case QEvent::FocusIn: focusInEvent( (QFocusEvent*)e ); setFontSys(); break; case QEvent::FocusOut: focusOutEvent( (QFocusEvent*)e ); break; case QEvent::Enter: enterEvent( e ); break; case QEvent::Leave: leaveEvent( e ); break; case QEvent::Paint: // At this point the event has to be delivered, regardless // whether the widget isVisible() or not because it // already went through the filters paintEvent( (QPaintEvent*)e ); break; case QEvent::Move: moveEvent( (QMoveEvent*)e ); break; case QEvent::Resize: resizeEvent( (QResizeEvent*)e ); break; case QEvent::Close: { QCloseEvent *c = (QCloseEvent *)e; closeEvent( c ); if ( !c->isAccepted() ) return FALSE; } break; case QEvent::ContextMenu: { QContextMenuEvent *c = (QContextMenuEvent *)e; contextMenuEvent( c ); if ( !c->isAccepted() ) return FALSE; } break; #ifndef QT_NO_DRAGANDDROP case QEvent::Drop: dropEvent( (QDropEvent*) e); break; case QEvent::DragEnter: dragEnterEvent( (QDragEnterEvent*) e); break; case QEvent::DragMove: dragMoveEvent( (QDragMoveEvent*) e); break; case QEvent::DragLeave: dragLeaveEvent( (QDragLeaveEvent*) e); break; #endif case QEvent::Show: showEvent( (QShowEvent*) e); break; case QEvent::Hide: hideEvent( (QHideEvent*) e); break; case QEvent::ShowWindowRequest: if ( isShown() ) showWindow(); break; case QEvent::ParentFontChange: if ( isTopLevel() ) break; // fall through case QEvent::ApplicationFontChange: if ( own_font ) setFont( fnt.resolve( qt_naturalWidgetFont( this ) ) ); else unsetFont(); break; #ifndef QT_NO_PALETTE case QEvent::ParentPaletteChange: if ( isTopLevel() ) break; // fall through case QEvent::ApplicationPaletteChange: if ( !own_palette && !isDesktop() ) unsetPalette(); # if defined(Q_WS_QWS) && !defined (QT_NO_QWS_MANAGER) if ( isTopLevel() && topData()->qwsManager ) { QRegion r( topData()->qwsManager->region() ); QApplication::postEvent(topData()->qwsManager, new QPaintEvent(r, FALSE) ); } # endif break; #endif case QEvent::WindowActivate: case QEvent::WindowDeactivate: windowActivationChange( e->type() != QEvent::WindowActivate ); if ( children() ) { QObjectListIt it( *children() ); QObject *o; while( ( o = it.current() ) != 0 ) { ++it; if ( o->isWidgetType() && ((QWidget*)o)->isVisible() && !((QWidget*)o)->isTopLevel() ) QApplication::sendEvent( o, e ); } } break; case QEvent::LanguageChange: case QEvent::LocaleChange: if ( children() ) { QObjectListIt it( *children() ); QObject *o; while( ( o = it.current() ) != 0 ) { ++it; QApplication::sendEvent( o, e ); } } if ( e->type() == QEvent::LanguageChange ) { int index = metaObject()->findSlot( "languageChange()", TRUE ); if ( index >= 0 ) qt_invoke( index, 0 ); } update(); break; #ifndef QT_NO_LAYOUT case QEvent::LayoutDirectionChange: if ( layout() ) { layout()->activate(); } else { QObjectList* llist = queryList( "QLayout", 0, TRUE, TRUE ); QObjectListIt lit( *llist ); QLayout *lay; while ( ( lay = (QLayout*)lit.current() ) != 0 ) { ++lit; lay->activate(); } delete llist; } update(); break; #endif case QEvent::WindowStateChange: { QEvent::Type type; if (isMinimized()) type = QEvent::ShowMinimized; else if (isFullScreen()) type = QEvent::ShowFullScreen; else if (isMaximized()) type = QEvent::ShowMaximized; else type = QEvent::ShowNormal; QApplication::postEvent(this, new QEvent(type)); break; } case QEvent::WindowBlocked: case QEvent::WindowUnblocked: if ( children() ) { QObjectListIt it( *children() ); QObject *o; while( ( o = it.current() ) != 0 ) { ++it; QWidget *w = ::qt_cast<QWidget*>(o); if (w && !w->testWFlags(Qt::WShowModal)) QApplication::sendEvent( o, e ); } } break; default: return FALSE; } return TRUE; } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive mouse move events for the widget. If mouse tracking is switched off, mouse move events only occur if a mouse button is pressed while the mouse is being moved. If mouse tracking is switched on, mouse move events occur even if no mouse button is pressed. QMouseEvent::pos() reports the position of the mouse cursor, relative to this widget. For press and release events, the position is usually the same as the position of the last mouse move event, but it might be different if the user's hand shakes. This is a feature of the underlying window system, not Qt. \sa setMouseTracking(), mousePressEvent(), mouseReleaseEvent(), mouseDoubleClickEvent(), event(), QMouseEvent */ void QWidget::mouseMoveEvent( QMouseEvent * e) { e->ignore(); } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive mouse press events for the widget. If you create new widgets in the mousePressEvent() the mouseReleaseEvent() may not end up where you expect, depending on the underlying window system (or X11 window manager), the widgets' location and maybe more. The default implementation implements the closing of popup widgets when you click outside the window. For other widget types it does nothing. \sa mouseReleaseEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), event(), QMouseEvent */ void QWidget::mousePressEvent( QMouseEvent *e ) { e->ignore(); if ( isPopup() ) { e->accept(); QWidget* w; while ( (w = qApp->activePopupWidget() ) && w != this ){ w->close(); if (qApp->activePopupWidget() == w) // widget does not want to dissappear w->hide(); // hide at least } if (!rect().contains(e->pos()) ){ close(); } } } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive mouse release events for the widget. \sa mouseReleaseEvent(), mouseDoubleClickEvent(), mouseMoveEvent(), event(), QMouseEvent */ void QWidget::mouseReleaseEvent( QMouseEvent * e ) { e->ignore(); } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive mouse double click events for the widget. The default implementation generates a normal mouse press event. Note that the widgets gets a mousePressEvent() and a mouseReleaseEvent() before the mouseDoubleClickEvent(). \sa mousePressEvent(), mouseReleaseEvent() mouseMoveEvent(), event(), QMouseEvent */ void QWidget::mouseDoubleClickEvent( QMouseEvent *e ) { mousePressEvent( e ); // try mouse press event } #ifndef QT_NO_WHEELEVENT /*! This event handler, for event \a e, can be reimplemented in a subclass to receive wheel events for the widget. If you reimplement this handler, it is very important that you \link QWheelEvent ignore()\endlink the event if you do not handle it, so that the widget's parent can interpret it. The default implementation ignores the event. \sa QWheelEvent::ignore(), QWheelEvent::accept(), event(), QWheelEvent */ void QWidget::wheelEvent( QWheelEvent *e ) { e->ignore(); } #endif /*! This event handler, for event \a e, can be reimplemented in a subclass to receive tablet events for the widget. If you reimplement this handler, it is very important that you \link QTabletEvent ignore()\endlink the event if you do not handle it, so that the widget's parent can interpret it. The default implementation ignores the event. \sa QTabletEvent::ignore(), QTabletEvent::accept(), event(), QTabletEvent */ void QWidget::tabletEvent( QTabletEvent *e ) { e->ignore(); } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive key press events for the widget. A widget must call setFocusPolicy() to accept focus initially and have focus in order to receive a key press event. If you reimplement this handler, it is very important that you explicitly \link QKeyEvent::ignore() ignore\endlink the event if you do not understand it, so that the widget's parent can interpret it; otherwise, the event will be implicitly accepted. Although top-level widgets are able to choose whether to accept or ignore unknown events because they have no parent widgets that could otherwise handle them, it is good practice to explicitly ignore events to make widgets as reusable as possible. The default implementation closes popup widgets if the user presses <b>Esc</b>. Otherwise the event is ignored. \sa keyReleaseEvent(), QKeyEvent::ignore(), setFocusPolicy(), focusInEvent(), focusOutEvent(), event(), QKeyEvent */ void QWidget::keyPressEvent( QKeyEvent *e ) { if ( isPopup() && e->key() == Key_Escape ) { e->accept(); close(); } else { e->ignore(); } } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive key release events for the widget. A widget must \link setFocusPolicy() accept focus\endlink initially and \link hasFocus() have focus\endlink in order to receive a key release event. If you reimplement this handler, it is very important that you \link QKeyEvent ignore()\endlink the release if you do not understand it, so that the widget's parent can interpret it. The default implementation ignores the event. \sa keyPressEvent(), QKeyEvent::ignore(), setFocusPolicy(), focusInEvent(), focusOutEvent(), event(), QKeyEvent */ void QWidget::keyReleaseEvent( QKeyEvent *e ) { e->ignore(); } /*! This event handler can be reimplemented in a subclass to receive keyboard focus events (focus received) for the widget. A widget normally must setFocusPolicy() to something other than \c NoFocus in order to receive focus events. (Note that the application programmer can call setFocus() on any widget, even those that do not normally accept focus.) The default implementation updates the widget (except for toplevel widgets that do not specify a focusPolicy() ). It also calls setMicroFocusHint(), hinting any system-specific input tools about the focus of the user's attention. \sa focusOutEvent(), setFocusPolicy(), keyPressEvent(), keyReleaseEvent(), event(), QFocusEvent */ void QWidget::focusInEvent( QFocusEvent * ) { if ( focusPolicy() != NoFocus || !isTopLevel() ) { update(); if ( testWState(WState_AutoMask) ) updateMask(); setMicroFocusHint(width()/2, 0, 1, height(), FALSE); } } /*! This event handler can be reimplemented in a subclass to receive keyboard focus events (focus lost) for the widget. A widget normally must setFocusPolicy() to something other than \c NoFocus in order to receive focus events. (Note that the application programmer can call setFocus() on any widget, even those that do not normally accept focus.) The default implementation updates the widget (except for toplevel widgets that do not specify a focusPolicy() ). It also calls setMicroFocusHint(), hinting any system-specific input tools about the focus of the user's attention. \sa focusInEvent(), setFocusPolicy(), keyPressEvent(), keyReleaseEvent(), event(), QFocusEvent */ void QWidget::focusOutEvent( QFocusEvent * ) { if ( focusPolicy() != NoFocus || !isTopLevel() ){ update(); if ( testWState(WState_AutoMask) ) updateMask(); } } /*! \property QWidget::microFocusHint \brief the currently set micro focus hint for this widget. See the documentation of setMicroFocusHint() for more information. */ QRect QWidget::microFocusHint() const { if ( !extra || extra->micro_focus_hint.isEmpty() ) return QRect(width()/2, 0, 1, height() ); else return extra->micro_focus_hint; } /*! This event handler can be reimplemented in a subclass to receive widget enter events. An event is sent to the widget when the mouse cursor enters the widget. \sa leaveEvent(), mouseMoveEvent(), event() */ void QWidget::enterEvent( QEvent * ) { } /*! This event handler can be reimplemented in a subclass to receive widget leave events. A leave event is sent to the widget when the mouse cursor leaves the widget. \sa enterEvent(), mouseMoveEvent(), event() */ void QWidget::leaveEvent( QEvent * ) { } /*! This event handler can be reimplemented in a subclass to receive paint events. A paint event is a request to repaint all or part of the widget. It can happen as a result of repaint() or update(), or because the widget was obscured and has now been uncovered, or for many other reasons. Many widgets can simply repaint their entire surface when asked to, but some slow widgets need to optimize by painting only the requested region: QPaintEvent::region(). This speed optimization does not change the result, as painting is clipped to that region during event processing. QListView and QCanvas do this, for example. Qt also tries to speed up painting by merging multiple paint events into one. When update() is called several times or the window system sends several paint events, Qt merges these events into one event with a larger region (see QRegion::unite()). repaint() does not permit this optimization, so we suggest using update() when possible. When the paint event occurs, the update region has normally been erased, so that you're painting on the widget's background. There are a couple of exceptions and QPaintEvent::erased() tells you whether the widget has been erased or not. The background can be set using setBackgroundMode(), setPaletteBackgroundColor() or setBackgroundPixmap(). The documentation for setBackgroundMode() elaborates on the background; we recommend reading it. \sa event(), repaint(), update(), QPainter, QPixmap, QPaintEvent */ void QWidget::paintEvent( QPaintEvent * ) { } /*! This event handler can be reimplemented in a subclass to receive widget move events. When the widget receives this event, it is already at the new position. The old position is accessible through QMoveEvent::oldPos(). \sa resizeEvent(), event(), move(), QMoveEvent */ void QWidget::moveEvent( QMoveEvent * ) { } /*! This event handler can be reimplemented in a subclass to receive widget resize events. When resizeEvent() is called, the widget already has its new geometry. The old size is accessible through QResizeEvent::oldSize(). The widget will be erased and receive a paint event immediately after processing the resize event. No drawing need be (or should be) done inside this handler. Widgets that have been created with the \c WNoAutoErase flag will not be erased. Nevertheless, they will receive a paint event for their entire area afterwards. Again, no drawing needs to be done inside this handler. The default implementation calls updateMask() if the widget has \link QWidget::setAutoMask() automatic masking\endlink enabled. \sa moveEvent(), event(), resize(), QResizeEvent, paintEvent() */ void QWidget::resizeEvent( QResizeEvent * ) { if ( testWState(WState_AutoMask) ) updateMask(); } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive widget close events. The default implementation calls e->accept(), which hides this widget. See the \l QCloseEvent documentation for more details. \sa event(), hide(), close(), QCloseEvent */ void QWidget::closeEvent( QCloseEvent *e ) { e->accept(); } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive widget context menu events. The default implementation calls e->ignore(), which rejects the context event. See the \l QContextMenuEvent documentation for more details. \sa event(), QContextMenuEvent */ void QWidget::contextMenuEvent( QContextMenuEvent *e ) { e->ignore(); } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive Input Method composition events. This handler is called when the user begins entering text using an Input Method. The default implementation calls e->ignore(), which rejects the Input Method event. See the \l QIMEvent documentation for more details. \sa event(), QIMEvent */ void QWidget::imStartEvent( QIMEvent *e ) { e->ignore(); } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive Input Method composition events. This handler is called when the user has entered some text using an Input Method. The default implementation calls e->ignore(), which rejects the Input Method event. See the \l QIMEvent documentation for more details. \sa event(), QIMEvent */ void QWidget::imComposeEvent( QIMEvent *e ) { e->ignore(); } /*! This event handler, for event \a e, can be reimplemented in a subclass to receive Input Method composition events. This handler is called when the user has finished inputting text via an Input Method. The default implementation calls e->ignore(), which rejects the Input Method event. See the \l QIMEvent documentation for more details. \sa event(), QIMEvent */ void QWidget::imEndEvent( QIMEvent *e ) { e->ignore(); } #ifndef QT_NO_DRAGANDDROP /*! This event handler is called when a drag is in progress and the mouse enters this widget. See the \link dnd.html Drag-and-drop documentation\endlink for an overview of how to provide drag-and-drop in your application. \sa QTextDrag, QImageDrag, QDragEnterEvent */ void QWidget::dragEnterEvent( QDragEnterEvent * ) { } /*! This event handler is called when a drag is in progress and the mouse enters this widget, and whenever it moves within the widget. See the \link dnd.html Drag-and-drop documentation\endlink for an overview of how to provide drag-and-drop in your application. \sa QTextDrag, QImageDrag, QDragMoveEvent */ void QWidget::dragMoveEvent( QDragMoveEvent * ) { } /*! This event handler is called when a drag is in progress and the mouse leaves this widget. See the \link dnd.html Drag-and-drop documentation\endlink for an overview of how to provide drag-and-drop in your application. \sa QTextDrag, QImageDrag, QDragLeaveEvent */ void QWidget::dragLeaveEvent( QDragLeaveEvent * ) { } /*! This event handler is called when the drag is dropped on this widget. See the \link dnd.html Drag-and-drop documentation\endlink for an overview of how to provide drag-and-drop in your application. \sa QTextDrag, QImageDrag, QDropEvent */ void QWidget::dropEvent( QDropEvent * ) { } #endif // QT_NO_DRAGANDDROP /*! This event handler can be reimplemented in a subclass to receive widget show events. Non-spontaneous show events are sent to widgets immediately before they are shown. The spontaneous show events of top-level widgets are delivered afterwards. \sa event(), QShowEvent */ void QWidget::showEvent( QShowEvent * ) { } /*! This event handler can be reimplemented in a subclass to receive widget hide events. Hide events are sent to widgets immediately after they have been hidden. \sa event(), QHideEvent */ void QWidget::hideEvent( QHideEvent * ) { } /* \fn QWidget::x11Event( MSG * ) This special event handler can be reimplemented in a subclass to receive native X11 events. In your reimplementation of this function, if you want to stop the event being handled by Qt, return TRUE. If you return FALSE, this native event is passed back to Qt, which translates the event into a Qt event and sends it to the widget. \warning This function is not portable. \sa QApplication::x11EventFilter() */ #if defined(Q_WS_MAC) /*! This special event handler can be reimplemented in a subclass to receive native Macintosh events. In your reimplementation of this function, if you want to stop the event being handled by Qt, return TRUE. If you return FALSE, this native event is passed back to Qt, which translates the event into a Qt event and sends it to the widget. \warning This function is not portable. \sa QApplication::macEventFilter() */ bool QWidget::macEvent( MSG * ) { return FALSE; } #endif #if defined(Q_WS_WIN) /*! This special event handler can be reimplemented in a subclass to receive native Windows events. In your reimplementation of this function, if you want to stop the event being handled by Qt, return TRUE. If you return FALSE, this native event is passed back to Qt, which translates the event into a Qt event and sends it to the widget. \warning This function is not portable. \sa QApplication::winEventFilter() */ bool QWidget::winEvent( MSG * ) { return FALSE; } #endif #if defined(Q_WS_X11) /*! This special event handler can be reimplemented in a subclass to receive native X11 events. In your reimplementation of this function, if you want to stop the event being handled by Qt, return TRUE. If you return FALSE, this native event is passed back to Qt, which translates the event into a Qt event and sends it to the widget. \warning This function is not portable. \sa QApplication::x11EventFilter() */ bool QWidget::x11Event( XEvent * ) { return FALSE; } #endif #if defined(Q_WS_QWS) /*! This special event handler can be reimplemented in a subclass to receive native Qt/Embedded events. In your reimplementation of this function, if you want to stop the event being handled by Qt, return TRUE. If you return FALSE, this native event is passed back to Qt, which translates the event into a Qt event and sends it to the widget. \warning This function is not portable. \sa QApplication::qwsEventFilter() */ bool QWidget::qwsEvent( QWSEvent * ) { return FALSE; } #endif /*! \property QWidget::autoMask \brief whether the auto mask feature is enabled for the widget Transparent widgets use a mask to define their visible region. QWidget has some built-in support to make the task of recalculating the mask easier. When setting auto mask to TRUE, updateMask() will be called whenever the widget is resized or changes its focus state. Note that you must reimplement updateMask() (which should include a call to setMask()) or nothing will happen. Note: when you re-implement resizeEvent(), focusInEvent() or focusOutEvent() in your custom widgets and still want to ensure that the auto mask calculation works, you should add: \code if ( autoMask() ) updateMask(); \endcode at the end of your event handlers. This is true for all member functions that change the appearance of the widget in a way that requires a recalculation of the mask. While being a technically appealing concept, masks have a big drawback: when using complex masks that cannot be expressed easily with relatively simple regions, they can be very slow on some window systems. The classic example is a transparent label. The complex shape of its contents makes it necessary to represent its mask by a bitmap, which consumes both memory and time. If all you want is to blend the background of several neighboring widgets together seamlessly, you will probably want to use setBackgroundOrigin() rather than a mask. \sa autoMask() updateMask() setMask() clearMask() setBackgroundOrigin() */ bool QWidget::autoMask() const { return testWState(WState_AutoMask); } void QWidget::setAutoMask( bool enable ) { if ( enable == autoMask() ) return; if ( enable ) { setWState(WState_AutoMask); updateMask(); } else { clearWState(WState_AutoMask); clearMask(); } } /*! \enum QWidget::BackgroundOrigin This enum defines the origin used to draw a widget's background pixmap. The pixmap is drawn using the: \value WidgetOrigin widget's coordinate system. \value ParentOrigin parent's coordinate system. \value WindowOrigin top-level window's coordinate system. \value AncestorOrigin same origin as the parent uses. */ /*! \property QWidget::backgroundOrigin \brief the origin of the widget's background The origin is either WidgetOrigin (the default), ParentOrigin, WindowOrigin or AncestorOrigin. This only makes a difference if the widget has a background pixmap, in which case positioning matters. Using \c WindowOrigin for several neighboring widgets makes the background blend together seamlessly. \c AncestorOrigin allows blending backgrounds seamlessly when an ancestor of the widget has an origin other than \c WindowOrigin. \sa backgroundPixmap(), setBackgroundMode() */ QWidget::BackgroundOrigin QWidget::backgroundOrigin() const { return extra ? (BackgroundOrigin)extra->bg_origin : WidgetOrigin; } void QWidget::setBackgroundOrigin( BackgroundOrigin origin ) { if ( origin == backgroundOrigin() ) return; createExtra(); extra->bg_origin = origin; update(); } /*! This function can be reimplemented in a subclass to support transparent widgets. It should be called whenever a widget changes state in a way that means that the shape mask must be recalculated. \sa setAutoMask(), updateMask(), setMask(), clearMask() */ void QWidget::updateMask() { } /*! \internal Returns the offset of the widget from the backgroundOrigin. \sa setBackgroundMode(), backgroundMode(), */ QPoint QWidget::backgroundOffset() const { if (!isTopLevel()) { switch(backgroundOrigin()) { case WidgetOrigin: break; case ParentOrigin: return pos(); case WindowOrigin: { const QWidget *topl = this; while(topl && !topl->isTopLevel() && !topl->testWFlags(Qt::WSubWindow)) topl = topl->parentWidget(TRUE); return mapTo((QWidget *)topl, QPoint(0, 0) ); } case AncestorOrigin: { const QWidget *topl = this; bool ancestorIsWindowOrigin = FALSE; while(topl && !topl->isTopLevel() && !topl->testWFlags(Qt::WSubWindow)) { if (!ancestorIsWindowOrigin) { if (topl->backgroundOrigin() == QWidget::WidgetOrigin) break; if (topl->backgroundOrigin() == QWidget::ParentOrigin) { topl = topl->parentWidget(TRUE); break; } if (topl->backgroundOrigin() == QWidget::WindowOrigin) ancestorIsWindowOrigin = TRUE; } topl = topl->parentWidget(TRUE); } return mapTo((QWidget *) topl, QPoint(0,0) ); } } } // fall back return QPoint(0,0); } /*! \fn QLayout* QWidget::layout () const Returns the layout engine that manages the geometry of this widget's children. If the widget does not have a layout, layout() returns 0. \sa sizePolicy() */ /* Sets this widget to use layout \a l to manage the geometry of its children. If the widget already had a layout, the old layout is forgotten. (Note that it is not deleted.) \sa layout() QLayout sizePolicy() */ #ifndef QT_NO_LAYOUT void QWidget::setLayout( QLayout *l ) { lay_out = l; } #endif /*! \property QWidget::sizePolicy \brief the default layout behavior of the widget If there is a QLayout that manages this widget's children, the size policy specified by that layout is used. If there is no such QLayout, the result of this function is used. The default policy is Preferred/Preferred, which means that the widget can be freely resized, but prefers to be the size sizeHint() returns. Button-like widgets set the size policy to specify that they may stretch horizontally, but are fixed vertically. The same applies to lineedit controls (such as QLineEdit, QSpinBox or an editable QComboBox) and other horizontally orientated widgets (such as QProgressBar). QToolButton's are normally square, so they allow growth in both directions. Widgets that support different directions (such as QSlider, QScrollBar or QHeader) specify stretching in the respective direction only. Widgets that can provide scrollbars (usually subclasses of QScrollView) tend to specify that they can use additional space, and that they can make do with less than sizeHint(). \sa sizeHint() QLayout QSizePolicy updateGeometry() */ QSizePolicy QWidget::sizePolicy() const { return extra ? extra->size_policy : QSizePolicy( QSizePolicy::Preferred, QSizePolicy::Preferred ); } void QWidget::setSizePolicy( QSizePolicy policy ) { setWState( WState_OwnSizePolicy ); if ( policy == sizePolicy() ) return; createExtra(); extra->size_policy = policy; updateGeometry(); } /*! \overload void QWidget::setSizePolicy( QSizePolicy::SizeType hor, QSizePolicy::SizeType ver, bool hfw ) Sets the size policy of the widget to \a hor, \a ver and \a hfw (height for width). \sa QSizePolicy::QSizePolicy() */ /*! Returns the preferred height for this widget, given the width \a w. The default implementation returns 0, indicating that the preferred height does not depend on the width. \warning Does not look at the widget's layout. */ int QWidget::heightForWidth( int w ) const { (void)w; return 0; } /*! \property QWidget::customWhatsThis \brief whether the widget wants to handle What's This help manually The default implementation of customWhatsThis() returns FALSE, which means the widget will not receive any events in Whats This mode. The widget may leave What's This mode by calling QWhatsThis::leaveWhatsThisMode(), with or without actually displaying any help text. You can also reimplement customWhatsThis() if your widget is a "passive interactor" supposed to work under all circumstances. Simply don't call QWhatsThis::leaveWhatsThisMode() in that case. \sa QWhatsThis::inWhatsThisMode() QWhatsThis::leaveWhatsThisMode() */ bool QWidget::customWhatsThis() const { return FALSE; } /*! Returns the visible child widget at pixel position \a (x, y) in the widget's own coordinate system. If \a includeThis is TRUE, and there is no child visible at \a (x, y), the widget itself is returned. */ QWidget *QWidget::childAt( int x, int y, bool includeThis ) const { if ( !rect().contains( x, y ) ) return 0; if ( children() ) { QObjectListIt it( *children() ); it.toLast(); QWidget *w, *t; while( (w=(QWidget *)it.current()) != 0 ) { --it; if ( w->isWidgetType() && !w->isTopLevel() && !w->isHidden() ) { if ( ( t = w->childAt( x - w->x(), y - w->y(), TRUE ) ) ) return t; } } } if ( includeThis ) return (QWidget*)this; return 0; } /*! \overload Returns the visible child widget at point \a p in the widget's own coordinate system. If \a includeThis is TRUE, and there is no child visible at \a p, the widget itself is returned. */ QWidget *QWidget::childAt( const QPoint & p, bool includeThis ) const { return childAt( p.x(), p.y(), includeThis ); } /*! Notifies the layout system that this widget has changed and may need to change geometry. Call this function if the sizeHint() or sizePolicy() have changed. For explicitly hidden widgets, updateGeometry() is a no-op. The layout system will be notified as soon as the widget is shown. */ void QWidget::updateGeometry() { if ( !isTopLevel() && isShown() ) QApplication::postEvent( parentWidget(), new QEvent( QEvent::LayoutHint ) ); } /*! Reparents the widget. The widget gets a new \a parent, new widget flags (\a f, but as usual, use 0) at a new position in its new parent (\a p). If \a showIt is TRUE, show() is called once the widget has been reparented. If the new parent widget is in a different top-level widget, the reparented widget and its children are appended to the end of the \link setFocusPolicy() tab chain \endlink of the new parent widget, in the same internal order as before. If one of the moved widgets had keyboard focus, reparent() calls clearFocus() for that widget. If the new parent widget is in the same top-level widget as the old parent, reparent doesn't change the tab order or keyboard focus. \warning It is extremely unlikely that you will ever need this function. If you have a widget that changes its content dynamically, it is far easier to use \l QWidgetStack or \l QWizard. \sa getWFlags() */ void QWidget::reparent( QWidget *parent, WFlags f, const QPoint &p, bool showIt ) { reparentSys( parent, f, p, showIt ); QEvent e( QEvent::Reparent ); QApplication::sendEvent( this, &e ); if (!own_font) unsetFont(); else setFont( fnt.resolve( qt_naturalWidgetFont( this ) ) ); #ifndef QT_NO_PALETTE if (!own_palette) unsetPalette(); #endif } /*! \overload A convenience version of reparent that does not take widget flags as argument. Calls reparent(\a parent, getWFlags() \& ~\l WType_Mask, \a p, \a showIt). */ void QWidget::reparent( QWidget *parent, const QPoint & p, bool showIt ) { reparent( parent, getWFlags() & ~WType_Mask, p, showIt ); } /*! \property QWidget::ownCursor \brief whether the widget uses its own cursor If FALSE, the widget uses its parent widget's cursor. \sa cursor */ /*! \property QWidget::ownFont \brief whether the widget uses its own font If FALSE, the widget uses its parent widget's font. \sa font */ /*! \property QWidget::ownPalette \brief whether the widget uses its own palette If FALSE, the widget uses its parent widget's palette. \sa palette */ void QWidget::repaint( bool erase ) { repaint( visibleRect(), erase ); } /*!\obsolete Use paletteBackgroundColor() or eraseColor() instead. */ const QColor & QWidget::backgroundColor() const { return eraseColor(); } /*!\obsolete Use setPaletteBackgroundColor() or setEraseColor() instead. */ void QWidget::setBackgroundColor( const QColor &c ) { setEraseColor( c ); } /*!\obsolete Use paletteBackgroundPixmap() or erasePixmap() instead. */ const QPixmap *QWidget::backgroundPixmap() const { return erasePixmap(); } /*!\obsolete Use setPaletteBackgroundPixmap() or setErasePixmap() instead. */ void QWidget::setBackgroundPixmap( const QPixmap &pm ) { setErasePixmap( pm ); } // documentation in qdesktopwidget_win.cpp void QDesktopWidget::insertChild( QObject *obj ) { if ( obj->isWidgetType() ) return; QWidget::insertChild( obj ); } /*! \property QWidget::windowOpacity \brief The level of opacity for the window. The valid range of opacity is from 1.0 (completely opaque) to 0.0 (completely transparent). By default the value of this property is 1.0. This feature is only present on Mac OS X and Windows 2000 and up. \warning Changing this property from opaque to transparent might issue a paint event that needs to be processed before the window is displayed correctly. This affects mainly the use of QPixmap::grabWindow(). Also note that semi-transparent windows update and resize significantely slower than opaque windows. */