/**************************************************************************** ** ** Implementation of QButtonGroup class ** ** Created : 950130 ** ** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the widgets 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 "qbuttongroup.h" #ifndef QT_NO_BUTTONGROUP #include "qbutton.h" #include "qptrlist.h" #include "qapplication.h" #include "qradiobutton.h" /*! \class QButtonGroup qbuttongroup.h \brief The QButtonGroup widget organizes QButton widgets in a group. \ingroup organizers \ingroup geomanagement \ingroup appearance \mainclass A button group widget makes it easier to deal with groups of buttons. Each button in a button group has a unique identifier. The button group emits a clicked() signal with this identifier when a button in the group is clicked. This makes a button group particularly useful when you have several similar buttons and want to connect all their clicked() signals to a single slot. An \link setExclusive() exclusive\endlink button group switches off all toggle buttons except the one that was clicked. A button group is, by default, non-exclusive. Note that all radio buttons that are inserted into a button group are mutually exclusive even if the button group is non-exclusive. (See setRadioButtonExclusive().) There are two ways of using a button group: \list \i The button group is the parent widget of a number of buttons, i.e. the button group is the parent argument in the button constructor. The buttons are assigned identifiers 0, 1, 2, etc., in the order they are created. A QButtonGroup can display a frame and a title because it inherits QGroupBox. \i The button group is an invisible widget and the contained buttons have some other parent widget. In this usage, each button must be manually inserted, using insert(), into the button group and given an identifier. \endlist A button can be removed from the group with remove(). A pointer to a button with a given id can be obtained using find(). The id of a button is available using id(). A button can be set \e on with setButton(). The number of buttons in the group is returned by count(). <img src=qbttngrp-m.png> <img src=qbttngrp-w.png> \sa QPushButton, QCheckBox, QRadioButton */ /*! \property QButtonGroup::exclusive \brief whether the button group is exclusive If this property is TRUE, then the buttons in the group are toggled, and to untoggle a button you must click on another button in the group. The default value is FALSE. */ /*! \property QButtonGroup::radioButtonExclusive \brief whether the radio buttons in the group are exclusive If this property is TRUE (the default), the \link QRadioButton radiobuttons\endlink in the group are treated exclusively. */ struct QButtonItem { QButton *button; int id; }; class QButtonList: public QPtrList<QButtonItem> { public: QButtonList() {} ~QButtonList() {} }; typedef QPtrListIterator<QButtonItem> QButtonListIt; /*! Constructs a button group with no title. The \a parent and \a name arguments are passed to the QWidget constructor. */ QButtonGroup::QButtonGroup( QWidget *parent, const char *name ) : QGroupBox( parent, name ) { init(); } /*! Constructs a button group with the title \a title. The \a parent and \a name arguments are passed to the QWidget constructor. */ QButtonGroup::QButtonGroup( const QString &title, QWidget *parent, const char *name ) : QGroupBox( title, parent, name ) { init(); } /*! Constructs a button group with no title. Child widgets will be arranged in \a strips rows or columns (depending on \a orientation). The \a parent and \a name arguments are passed to the QWidget constructor. */ QButtonGroup::QButtonGroup( int strips, Orientation orientation, QWidget *parent, const char *name ) : QGroupBox( strips, orientation, parent, name ) { init(); } /*! Constructs a button group with title \a title. Child widgets will be arranged in \a strips rows or columns (depending on \a orientation). The \a parent and \a name arguments are passed to the QWidget constructor. */ QButtonGroup::QButtonGroup( int strips, Orientation orientation, const QString &title, QWidget *parent, const char *name ) : QGroupBox( strips, orientation, title, parent, name ) { init(); } /*! Initializes the button group. */ void QButtonGroup::init() { buttons = new QButtonList; Q_CHECK_PTR( buttons ); buttons->setAutoDelete( TRUE ); excl_grp = FALSE; radio_excl = TRUE; } /*! \reimp */ QButtonGroup::~QButtonGroup() { QButtonList * tmp = buttons; QButtonItem *bi = tmp->first(); buttons = 0; while( bi ) { bi->button->setGroup(0); bi = tmp->next(); } delete tmp; } bool QButtonGroup::isExclusive() const { return excl_grp; } void QButtonGroup::setExclusive( bool enable ) { excl_grp = enable; } /*! Inserts the \a button with the identifier \a id into the button group. Returns the button identifier. Buttons are normally inserted into a button group automatically by passing the button group as the parent when the button is constructed. So it is not necessary to manually insert buttons that have this button group as their parent widget. An exception is when you want custom identifiers instead of the default 0, 1, 2, etc., or if you want the buttons to have some other parent. The button is assigned the identifier \a id or an automatically generated identifier. It works as follows: If \a id >= 0, this identifier is assigned. If \a id == -1 (default), the identifier is equal to the number of buttons in the group. If \a id is any other negative integer, for instance -2, a unique identifier (negative integer \<= -2) is generated. No button has an id of -1. \sa find(), remove(), setExclusive() */ int QButtonGroup::insert( QButton *button, int id ) { if ( button->group() ) button->group()->remove( button ); static int seq_no = -2; QButtonItem *bi = new QButtonItem; Q_CHECK_PTR( bi ); if ( id < -1 ) bi->id = seq_no--; else if ( id == -1 ) bi->id = buttons->count(); else bi->id = id; bi->button = button; button->setGroup(this); buttons->append( bi ); connect( button, SIGNAL(pressed()) , SLOT(buttonPressed()) ); connect( button, SIGNAL(released()), SLOT(buttonReleased()) ); connect( button, SIGNAL(clicked()) , SLOT(buttonClicked()) ); connect( button, SIGNAL(toggled(bool)) , SLOT(buttonToggled(bool)) ); if ( button->isToggleButton() && !button->isOn() && selected() && (selected()->focusPolicy() & TabFocus) != 0 ) button->setFocusPolicy( (FocusPolicy)(button->focusPolicy() & ~TabFocus) ); return bi->id; } /*! Returns the number of buttons in the group. */ int QButtonGroup::count() const { return buttons->count(); } /*! Removes the \a button from the button group. \sa insert() */ void QButtonGroup::remove( QButton *button ) { if ( !buttons ) return; QButtonListIt it( *buttons ); QButtonItem *i; while ( (i=it.current()) != 0 ) { ++it; if ( i->button == button ) { buttons->remove( i ); button->setGroup(0); button->disconnect( this ); return; } } } /*! Returns the button with the specified identifier \a id, or 0 if the button was not found. */ QButton *QButtonGroup::find( int id ) const { // introduce a QButtonListIt if calling anything for ( QButtonItem *i=buttons->first(); i; i=buttons->next() ) if ( i->id == id ) return i->button; return 0; } /*! \fn void QButtonGroup::pressed( int id ) This signal is emitted when a button in the group is \link QButton::pressed() pressed\endlink. The \a id argument is the button's identifier. \sa insert() */ /*! \fn void QButtonGroup::released( int id ) This signal is emitted when a button in the group is \link QButton::released() released\endlink. The \a id argument is the button's identifier. \sa insert() */ /*! \fn void QButtonGroup::clicked( int id ) This signal is emitted when a button in the group is \link QButton::clicked() clicked\endlink. The \a id argument is the button's identifier. \sa insert() */ /*! \internal This slot is activated when one of the buttons in the group emits the QButton::pressed() signal. */ void QButtonGroup::buttonPressed() { // introduce a QButtonListIt if calling anything int id = -1; QButton *bt = (QButton *)sender(); // object that sent the signal for ( register QButtonItem *i=buttons->first(); i; i=buttons->next() ) if ( bt == i->button ) { // button was clicked id = i->id; break; } if ( id != -1 ) emit pressed( id ); } /*! \internal This slot is activated when one of the buttons in the group emits the QButton::released() signal. */ void QButtonGroup::buttonReleased() { // introduce a QButtonListIt if calling anything int id = -1; QButton *bt = (QButton *)sender(); // object that sent the signal for ( register QButtonItem *i=buttons->first(); i; i=buttons->next() ) if ( bt == i->button ) { // button was clicked id = i->id; break; } if ( id != -1 ) emit released( id ); } /*! \internal This slot is activated when one of the buttons in the group emits the QButton::clicked() signal. */ void QButtonGroup::buttonClicked() { // introduce a QButtonListIt if calling anything int id = -1; QButton *bt = ::qt_cast<QButton*>(sender()); // object that sent the signal #if defined(QT_CHECK_NULL) Q_ASSERT( bt ); #endif for ( register QButtonItem *i=buttons->first(); i; i=buttons->next() ) { if ( bt == i->button ) { // button was clicked id = i->id; break; } } if ( id != -1 ) emit clicked( id ); } /*! \internal This slot is activated when one of the buttons in the group emits the QButton::toggled() signal. */ void QButtonGroup::buttonToggled( bool on ) { // introduce a QButtonListIt if calling anything if ( !on || !excl_grp && !radio_excl ) return; QButton *bt = ::qt_cast<QButton*>(sender()); // object that sent the signal #if defined(QT_CHECK_NULL) Q_ASSERT( bt ); Q_ASSERT( bt->isToggleButton() ); #endif if ( !excl_grp && !::qt_cast<QRadioButton*>(bt) ) return; QButtonItem * i = buttons->first(); bool hasTabFocus = FALSE; while( i != 0 && hasTabFocus == FALSE ) { if ( ( excl_grp || ::qt_cast<QRadioButton*>(i->button) ) && (i->button->focusPolicy() & TabFocus) ) hasTabFocus = TRUE; i = buttons->next(); } i = buttons->first(); while( i ) { if ( bt != i->button && i->button->isToggleButton() && i->button->isOn() && ( excl_grp || ::qt_cast<QRadioButton*>(i->button) ) ) i->button->setOn( FALSE ); if ( ( excl_grp || ::qt_cast<QRadioButton*>(i->button) ) && i->button->isToggleButton() && hasTabFocus ) i->button->setFocusPolicy( (FocusPolicy)(i->button->focusPolicy() & ~TabFocus) ); i = buttons->next(); } if ( hasTabFocus ) bt->setFocusPolicy( (FocusPolicy)(bt->focusPolicy() | TabFocus) ); } void QButtonGroup::setButton( int id ) { QButton * b = find( id ); if ( b ) b->setOn( TRUE ); } void QButtonGroup::setRadioButtonExclusive( bool on) { radio_excl = on; } /*! Moves the keyboard focus according to \a key, and if appropriate checks the new focus item. This function does nothing unless the keyboard focus points to one of the button group members and \a key is one of \c Key_Up, \c Key_Down, \c Key_Left and \c Key_Right. */ void QButtonGroup::moveFocus( int key ) { QWidget * f = qApp->focusWidget(); QButtonItem * i; i = buttons->first(); while( i && i->button != f ) i = buttons->next(); if ( !i || !i->button ) return; QWidget * candidate = 0; int bestScore = -1; QPoint goal( f->mapToGlobal( f->geometry().center() ) ); i = buttons->first(); while( i && i->button ) { if ( i->button != f && i->button->isEnabled() ) { QPoint p(i->button->mapToGlobal(i->button->geometry().center())); int score = (p.y() - goal.y())*(p.y() - goal.y()) + (p.x() - goal.x())*(p.x() - goal.x()); bool betterScore = score < bestScore || !candidate; switch( key ) { case Key_Up: if ( p.y() < goal.y() && betterScore ) { if ( QABS( p.x() - goal.x() ) < QABS( p.y() - goal.y() ) ) { candidate = i->button; bestScore = score; } else if ( i->button->x() == f->x() ) { candidate = i->button; bestScore = score/2; } } break; case Key_Down: if ( p.y() > goal.y() && betterScore ) { if ( QABS( p.x() - goal.x() ) < QABS( p.y() - goal.y() ) ) { candidate = i->button; bestScore = score; } else if ( i->button->x() == f->x() ) { candidate = i->button; bestScore = score/2; } } break; case Key_Left: if ( p.x() < goal.x() && betterScore ) { if ( QABS( p.y() - goal.y() ) < QABS( p.x() - goal.x() ) ) { candidate = i->button; bestScore = score; } else if ( i->button->y() == f->y() ) { candidate = i->button; bestScore = score/2; } } break; case Key_Right: if ( p.x() > goal.x() && betterScore ) { if ( QABS( p.y() - goal.y() ) < QABS( p.x() - goal.x() ) ) { candidate = i->button; bestScore = score; } else if ( i->button->y() == f->y() ) { candidate = i->button; bestScore = score/2; } } break; } } i = buttons->next(); } QButton *buttoncand = ::qt_cast<QButton*>(candidate); if ( buttoncand && ::qt_cast<QButton*>(f) && ((QButton*)f)->isOn() && buttoncand->isToggleButton() && ( isExclusive() || ( ::qt_cast<QRadioButton*>(f) && ::qt_cast<QRadioButton*>(candidate)))) { if ( f->focusPolicy() & TabFocus ) { f->setFocusPolicy( (FocusPolicy)(f->focusPolicy() & ~TabFocus) ); candidate->setFocusPolicy( (FocusPolicy)(candidate->focusPolicy()| TabFocus) ); } buttoncand->setOn( TRUE ); buttoncand->animateClick(); buttoncand->animateTimeout(); // ### crude l&f hack } if ( candidate ) { if (key == Key_Up || key == Key_Left) QFocusEvent::setReason(QFocusEvent::Backtab); else QFocusEvent::setReason(QFocusEvent::Tab); candidate->setFocus(); QFocusEvent::resetReason(); } } /*! Returns the selected toggle button if exactly one is selected; otherwise returns 0. \sa selectedId() */ QButton * QButtonGroup::selected() const { if ( !buttons ) return 0; QButtonListIt it( *buttons ); QButtonItem *i; QButton *candidate = 0; while ( (i = it.current()) != 0 ) { ++it; if ( i->button && i->button->isToggleButton() && i->button->isOn() ) { if ( candidate != 0 ) return 0; candidate = i->button; } } return candidate; } /*! \property QButtonGroup::selectedId \brief the selected toggle button The toggle button is specified as an ID. If no toggle button is selected, this property holds -1. If setButton() is called on an exclusive group, the button with the given id will be set to on and all the others will be set to off. \sa selected() */ int QButtonGroup::selectedId() const { return id( selected() ); } /*! Returns the id of \a button, or -1 if \a button is not a member of this group. \sa selectedId(); */ int QButtonGroup::id( QButton * button ) const { QButtonItem *i = buttons->first(); while ( i && i->button != button ) i = buttons->next(); return i ? i->id : -1; } /*! \reimp */ bool QButtonGroup::event( QEvent * e ) { if ( e->type() == QEvent::ChildInserted ) { QChildEvent * ce = (QChildEvent *) e; if ( radio_excl && ::qt_cast<QRadioButton*>(ce->child()) ) { QButton * button = (QButton *) ce->child(); if ( button->isToggleButton() && !button->isOn() && selected() && (selected()->focusPolicy() & TabFocus) != 0 ) button->setFocusPolicy( (FocusPolicy)(button->focusPolicy() & ~TabFocus) ); } } return QGroupBox::event( e ); } #endif