<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/listviews/listviews.doc:4 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Listviews</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Listviews</h1> <p> This examples shows how to work with listviews (hierarchical and multi-column). It also shows how to subclass listview items for special reasons. It looks and works like the main window of a mail client. <p> <hr> <p> Header file: <p> <pre>/**************************************************************************** ** $Id: qt/listviews.h 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #ifndef LISTVIEWS_H #define LISTVIEWS_H #include <<a href="qsplitter-h.html">ntqsplitter.h</a>> #include <<a href="qstring-h.html">ntqstring.h</a>> #include <<a href="qobject-h.html">ntqobject.h</a>> #include <<a href="qdatetime-h.html">ntqdatetime.h</a>> #include <<a href="qptrlist-h.html">ntqptrlist.h</a>> #include <<a href="qlistview-h.html">ntqlistview.h</a>> class TQListView; class TQLabel; class TQPainter; class TQColorGroup; class TQObjectList; class TQPopupMenu; // ----------------------------------------------------------------- class MessageHeader { public: MessageHeader( const <a href="ntqstring.html">TQString</a> &_sender, const <a href="ntqstring.html">TQString</a> &_subject, const <a href="ntqdatetime.html">TQDateTime</a> &_datetime ) : msender( _sender ), msubject( _subject ), mdatetime( _datetime ) {} MessageHeader( const MessageHeader &mh ); MessageHeader &operator=( const MessageHeader &mh ); <a href="ntqstring.html">TQString</a> sender() { return msender; } <a href="ntqstring.html">TQString</a> subject() { return msubject; } <a href="ntqdatetime.html">TQDateTime</a> datetime() { return mdatetime; } protected: <a href="ntqstring.html">TQString</a> msender, msubject; <a href="ntqdatetime.html">TQDateTime</a> mdatetime; }; // ----------------------------------------------------------------- class Message { public: enum State { Read = 0, Unread}; Message( const MessageHeader &mh, const <a href="ntqstring.html">TQString</a> &_body ) : mheader( mh ), mbody( _body ), mstate( Unread ) {} Message( const Message &m ) : mheader( m.mheader ), mbody( m.mbody ), mstate( m.mstate ) {} MessageHeader header() { return mheader; } <a href="ntqstring.html">TQString</a> body() { return mbody; } void setState( const State &s ) { mstate = s; } State state() { return mstate; } protected: MessageHeader mheader; <a href="ntqstring.html">TQString</a> mbody; State mstate; }; // ----------------------------------------------------------------- class Folder : public <a href="ntqobject.html">TQObject</a> { <a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a> public: Folder( Folder *parent, const <a href="ntqstring.html">TQString</a> &name ); ~Folder() {} void addMessage( Message *m ) <a name="x131"></a> { lstMessages.<a href="ntqptrlist.html#append">append</a>( m ); } <a href="ntqstring.html">TQString</a> folderName() { return fName; } <a name="x132"></a> Message *firstMessage() { return lstMessages.<a href="ntqptrlist.html#first">first</a>(); } <a name="x133"></a> Message *nextMessage() { return lstMessages.<a href="ntqptrlist.html#next">next</a>(); } protected: <a href="ntqstring.html">TQString</a> fName; <a href="ntqptrlist.html">TQPtrList</a><Message> lstMessages; }; // ----------------------------------------------------------------- class FolderListItem : public <a href="qlistviewitem.html">TQListViewItem</a> { public: FolderListItem( <a href="ntqlistview.html">TQListView</a> *parent, Folder *f ); FolderListItem( FolderListItem *parent, Folder *f ); void insertSubFolders( const <a href="ntqobjectlist.html">TQObjectList</a> *lst ); Folder *folder() { return myFolder; } protected: Folder *myFolder; }; // ----------------------------------------------------------------- class MessageListItem : public <a href="qlistviewitem.html">TQListViewItem</a> { public: MessageListItem( <a href="ntqlistview.html">TQListView</a> *parent, Message *m ); virtual void paintCell( <a href="ntqpainter.html">TQPainter</a> *p, const <a href="qcolorgroup.html">TQColorGroup</a> &cg, int column, int width, int alignment ); Message *message() { return myMessage; } protected: Message *myMessage; }; // ----------------------------------------------------------------- class ListViews : public <a href="ntqsplitter.html">TQSplitter</a> { TQ_OBJECT public: ListViews( <a href="ntqwidget.html">TQWidget</a> *parent = 0, const char *name = 0 ); ~ListViews() {} protected: void initFolders(); void initFolder( Folder *folder, unsigned int &count ); void setupFolders(); <a href="ntqlistview.html">TQListView</a> *messages, *folders; <a href="ntqlabel.html">TQLabel</a> *message; <a href="ntqpopupmenu.html">TQPopupMenu</a>* menu; <a href="ntqptrlist.html">TQPtrList</a><Folder> lstFolders; protected slots: void slotFolderChanged( <a href="qlistviewitem.html">TQListViewItem</a>* ); void slotMessageChanged(); void slotRMB( <a href="qlistviewitem.html">TQListViewItem</a>*, const <a href="ntqpoint.html">TQPoint</a> &, int ); }; #endif </pre> <p> <hr> <p> Implementation: <p> <pre>/**************************************************************************** ** $Id: qt/listviews.cpp 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include "listviews.h" #include <<a href="qlabel-h.html">ntqlabel.h</a>> #include <<a href="qpainter-h.html">ntqpainter.h</a>> #include <<a href="qpalette-h.html">ntqpalette.h</a>> #include <<a href="qobjectlist-h.html">ntqobjectlist.h</a>> #include <<a href="qpopupmenu-h.html">ntqpopupmenu.h</a>> #include <<a href="qheader-h.html">ntqheader.h</a>> #include <<a href="qregexp-h.html">ntqregexp.h</a>> // ----------------------------------------------------------------- MessageHeader::MessageHeader( const MessageHeader &mh ) { msender = mh.msender; msubject = mh.msubject; mdatetime = mh.mdatetime; } MessageHeader &MessageHeader::operator=( const MessageHeader &mh ) { msender = mh.msender; msubject = mh.msubject; mdatetime = mh.mdatetime; return *this; } // ----------------------------------------------------------------- <a name="f208"></a>Folder::Folder( Folder *parent, const <a href="ntqstring.html">TQString</a> &name ) : <a href="ntqobject.html">TQObject</a>( parent, name ), fName( name ) { lstMessages.setAutoDelete( TRUE ); } // ----------------------------------------------------------------- <a name="f209"></a>FolderListItem::FolderListItem( <a href="ntqlistview.html">TQListView</a> *parent, Folder *f ) : <a href="qlistviewitem.html">TQListViewItem</a>( parent ) { myFolder = f; <a href="qlistviewitem.html#setText">setText</a>( 0, f->folderName() ); if ( myFolder->children() ) insertSubFolders( myFolder->children() ); } FolderListItem::FolderListItem( FolderListItem *parent, Folder *f ) : <a href="qlistviewitem.html">TQListViewItem</a>( parent ) { myFolder = f; <a href="qlistviewitem.html#setText">setText</a>( 0, f->folderName() ); if ( myFolder->children() ) insertSubFolders( myFolder->children() ); } void <a name="f210"></a>FolderListItem::insertSubFolders( const <a href="ntqobjectlist.html">TQObjectList</a> *lst ) { Folder *f; for ( f = ( Folder* )( ( <a href="ntqobjectlist.html">TQObjectList</a>* )lst )->first(); f; f = ( Folder* )( ( <a href="ntqobjectlist.html">TQObjectList</a>* )lst )->next() ) (void)new FolderListItem( this, f ); } // ----------------------------------------------------------------- <a name="f218"></a>MessageListItem::MessageListItem( <a href="ntqlistview.html">TQListView</a> *parent, Message *m ) : <a href="qlistviewitem.html">TQListViewItem</a>( parent ) { myMessage = m; <a href="qlistviewitem.html#setText">setText</a>( 0, myMessage->header().sender() ); <a href="qlistviewitem.html#setText">setText</a>( 1, myMessage->header().subject() ); <a href="qlistviewitem.html#setText">setText</a>( 2, myMessage->header().datetime().toString() ); } <a name="x157"></a>void MessageListItem::<a href="qlistviewitem.html#paintCell">paintCell</a>( <a href="ntqpainter.html">TQPainter</a> *p, const <a href="qcolorgroup.html">TQColorGroup</a> &cg, int column, int width, int alignment ) { <a href="qcolorgroup.html">TQColorGroup</a> _cg( cg ); <a name="x135"></a> <a href="ntqcolor.html">TQColor</a> c = _cg.<a href="qcolorgroup.html#text">text</a>(); if ( myMessage->state() == Message::Unread ) <a name="x134"></a> _cg.<a href="qcolorgroup.html#setColor">setColor</a>( TQColorGroup::Text, TQt::red ); TQListViewItem::<a href="qlistviewitem.html#paintCell">paintCell</a>( p, _cg, column, width, alignment ); _cg.<a href="qcolorgroup.html#setColor">setColor</a>( TQColorGroup::Text, c ); } // ----------------------------------------------------------------- <a name="f211"></a>ListViews::ListViews( <a href="ntqwidget.html">TQWidget</a> *parent, const char *name ) : <a href="ntqsplitter.html">TQSplitter</a>( TQt::Horizontal, parent, name ) { lstFolders.setAutoDelete( TRUE ); folders = new <a href="ntqlistview.html">TQListView</a>( this ); <a name="x147"></a> folders-><a href="ntqlistview.html#header">header</a>()->setClickEnabled( FALSE ); <a name="x141"></a> folders-><a href="ntqlistview.html#addColumn">addColumn</a>( "Folder" ); initFolders(); setupFolders(); <a name="x152"></a> folders-><a href="ntqlistview.html#setRootIsDecorated">setRootIsDecorated</a>( TRUE ); <a href="ntqsplitter.html#setResizeMode">setResizeMode</a>( folders, TQSplitter::KeepSize ); <a href="ntqsplitter.html">TQSplitter</a> *vsplitter = new <a href="ntqsplitter.html">TQSplitter</a>( TQt::Vertical, this ); messages = new <a href="ntqlistview.html">TQListView</a>( vsplitter ); messages-><a href="ntqlistview.html#addColumn">addColumn</a>( "Sender" ); messages-><a href="ntqlistview.html#addColumn">addColumn</a>( "Subject" ); messages-><a href="ntqlistview.html#addColumn">addColumn</a>( "Date" ); <a name="x150"></a> messages-><a href="ntqlistview.html#setColumnAlignment">setColumnAlignment</a>( 1, TQt::AlignRight ); <a name="x149"></a> messages-><a href="ntqlistview.html#setAllColumnsShowFocus">setAllColumnsShowFocus</a>( TRUE ); <a name="x155"></a> messages-><a href="ntqlistview.html#setShowSortIndicator">setShowSortIndicator</a>( TRUE ); menu = new <a href="ntqpopupmenu.html">TQPopupMenu</a>( messages ); for( int i = 1; i <= 10; i++ ) menu-><a href="ntqmenudata.html#insertItem">insertItem</a>( TQString( "Context Item %1" ).arg( i ) ); <a name="x143"></a> <a href="ntqobject.html#connect">connect</a>(messages, SIGNAL( <a href="ntqlistview.html#contextMenuRequested">contextMenuRequested</a>( <a href="qlistviewitem.html">TQListViewItem</a> *, const <a href="ntqpoint.html">TQPoint</a>& , int ) ), this, SLOT( slotRMB( <a href="qlistviewitem.html">TQListViewItem</a> *, const <a href="ntqpoint.html">TQPoint</a> &, int ) ) ); <a name="x161"></a> vsplitter-><a href="ntqsplitter.html#setResizeMode">setResizeMode</a>( messages, TQSplitter::KeepSize ); message = new <a href="ntqlabel.html">TQLabel</a>( vsplitter ); message-><a href="ntqlabel.html#setAlignment">setAlignment</a>( TQt::AlignTop ); <a name="x163"></a> message-><a href="ntqwidget.html#setBackgroundMode">setBackgroundMode</a>( PaletteBase ); <a name="x148"></a> <a href="ntqobject.html#connect">connect</a>( folders, SIGNAL( <a href="ntqlistview.html#selectionChanged">selectionChanged</a>( <a href="qlistviewitem.html">TQListViewItem</a>* ) ), this, SLOT( slotFolderChanged( <a href="qlistviewitem.html">TQListViewItem</a>* ) ) ); <a href="ntqobject.html#connect">connect</a>( messages, SIGNAL( <a href="ntqlistview.html#selectionChanged">selectionChanged</a>() ), this, SLOT( slotMessageChanged() ) ); <a name="x144"></a> <a href="ntqobject.html#connect">connect</a>( messages, SIGNAL( <a href="ntqlistview.html#currentChanged">currentChanged</a>( <a href="qlistviewitem.html">TQListViewItem</a> * ) ), this, SLOT( slotMessageChanged() ) ); <a name="x154"></a> messages-><a href="ntqlistview.html#setSelectionMode">setSelectionMode</a>( TQListView::Extended ); // some preparations <a name="x146"></a> folders-><a href="ntqlistview.html#firstChild">firstChild</a>()->setOpen( TRUE ); folders-><a href="ntqlistview.html#firstChild">firstChild</a>()->firstChild()->setOpen( TRUE ); <a name="x151"></a> folders-><a href="ntqlistview.html#setCurrentItem">setCurrentItem</a>( folders-><a href="ntqlistview.html#firstChild">firstChild</a>()->firstChild()->firstChild() ); <a name="x153"></a> folders-><a href="ntqlistview.html#setSelected">setSelected</a>( folders-><a href="ntqlistview.html#firstChild">firstChild</a>()->firstChild()->firstChild(), TRUE ); messages-><a href="ntqlistview.html#setSelected">setSelected</a>( messages-><a href="ntqlistview.html#firstChild">firstChild</a>(), TRUE ); messages-><a href="ntqlistview.html#setCurrentItem">setCurrentItem</a>( messages-><a href="ntqlistview.html#firstChild">firstChild</a>() ); message-><a href="ntqframe.html#setMargin">setMargin</a>( 5 ); <a href="ntqvaluelist.html">TQValueList</a><int> lst; <a name="x160"></a> lst.<a href="ntqptrlist.html#append">append</a>( 170 ); <a href="ntqsplitter.html#setSizes">setSizes</a>( lst ); } void <a name="f212"></a>ListViews::initFolders() { unsigned int mcount = 1; for ( unsigned int i = 1; i < 20; i++ ) { <a href="ntqstring.html">TQString</a> str; str = TQString( "Folder %1" ).arg( i ); Folder *f = new Folder( 0, str ); for ( unsigned int j = 1; j < 5; j++ ) { <a href="ntqstring.html">TQString</a> str2; str2 = TQString( "Sub Folder %1" ).arg( j ); Folder *f2 = new Folder( f, str2 ); for ( unsigned int k = 1; k < 3; k++ ) { <a href="ntqstring.html">TQString</a> str3; str3 = TQString( "Sub Sub Folder %1" ).arg( k ); Folder *f3 = new Folder( f2, str3 ); initFolder( f3, mcount ); } } lstFolders.append( f ); } } void <a name="f213"></a>ListViews::initFolder( Folder *folder, unsigned int &count ) { for ( unsigned int i = 0; i < 15; i++, count++ ) { <a href="ntqstring.html">TQString</a> str; str = TQString( "Message %1 " ).arg( count ); <a name="x137"></a> <a href="ntqdatetime.html">TQDateTime</a> dt = TQDateTime::<a href="ntqdatetime.html#currentDateTime">currentDateTime</a>(); <a name="x136"></a> dt = dt.<a href="ntqdatetime.html#addSecs">addSecs</a>( 60 * count ); MessageHeader mh( "Trolltech <info@trolltech.com> ", str, dt ); <a href="ntqstring.html">TQString</a> body; body = TQString( "This is the message number %1 of this application, \n" "which shows how to use TQListViews, TQListViewItems, \n" "TQSplitters and so on. The code should show how easy\n" "this can be done in TQt." ).arg( count ); Message *msg = new Message( mh, body ); folder->addMessage( msg ); } } void <a name="f214"></a>ListViews::setupFolders() { <a name="x142"></a> folders-><a href="ntqlistview.html#clear">clear</a>(); for ( Folder* f = lstFolders.first(); f; f = lstFolders.next() ) (void)new FolderListItem( folders, f ); } void <a name="f215"></a>ListViews::slotRMB( <a href="qlistviewitem.html">TQListViewItem</a>* Item, const <a href="ntqpoint.html">TQPoint</a> & point, int ) { if( Item ) <a name="x159"></a> menu-><a href="ntqpopupmenu.html#popup">popup</a>( point ); } void <a name="f216"></a>ListViews::slotFolderChanged( <a href="qlistviewitem.html">TQListViewItem</a> *i ) { if ( !i ) return; messages-><a href="ntqlistview.html#clear">clear</a>(); <a name="x140"></a> message-><a href="ntqlabel.html#setText">setText</a>( "" ); FolderListItem *item = ( FolderListItem* )i; for ( Message* msg = item->folder()->firstMessage(); msg; msg = item->folder()->nextMessage() ) (void)new MessageListItem( messages, msg ); } void <a name="f217"></a>ListViews::slotMessageChanged() { <a name="x145"></a> <a href="qlistviewitem.html">TQListViewItem</a> *i = messages-><a href="ntqlistview.html#currentItem">currentItem</a>(); if ( !i ) return; <a name="x156"></a> if ( !i-><a href="qlistviewitem.html#isSelected">isSelected</a>() ) { message-><a href="ntqlabel.html#setText">setText</a>( "" ); return; } MessageListItem *item = ( MessageListItem* )i; Message *msg = item->message(); <a href="ntqstring.html">TQString</a> text; <a href="ntqstring.html">TQString</a> tmp = msg->header().sender(); <a name="x162"></a> tmp = tmp.<a href="ntqstring.html#replace">replace</a>( "<", "&lt;" ); tmp = tmp.<a href="ntqstring.html#replace">replace</a>( ">", "&gt;" ); text = TQString( "<b><i>From:</i></b> <a href=\"mailto:info@trolltech.com\">%1</a><br>" "<b><i>Subject:</i></b> <big><big><b>%2</b></big></big><br>" "<b><i>Date:</i></b> %3<br><br>" "%4" ). arg( tmp ).arg( msg->header().subject() ). arg( msg->header().datetime().toString() ).arg( msg->body() ); message-><a href="ntqlabel.html#setText">setText</a>( text ); msg->setState( Message::Read ); } </pre> <p> <hr> <p> Main: <p> <pre>/**************************************************************************** ** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for TQt. This example ** program may be used, distributed and modified without limitation. ** *****************************************************************************/ #include "listviews.h" #include <<a href="qapplication-h.html">ntqapplication.h</a>> int main( int argc, char **argv ) { <a href="ntqapplication.html">TQApplication</a> a( argc, argv ); ListViews listViews; <a name="x166"></a> listViews.<a href="ntqwidget.html#resize">resize</a>( 640, 480 ); <a name="x167"></a> listViews.<a href="ntqwidget.html#setCaption">setCaption</a>( "TQt Example - Listview" ); a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &listViews ); listViews.<a href="ntqwidget.html#show">show</a>(); return a.<a href="ntqapplication.html#exec">exec</a>(); } </pre> <p>See also <a href="examples.html">Examples</a>. <!-- eof --> <p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>TQt 3.3.8</div> </table></div></address></body> </html>