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<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 3.0.2 edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef LISTVIEWS_H
#define LISTVIEWS_H
#include <<a href="qsplitter-h.html">qsplitter.h</a>>
#include <<a href="qstring-h.html">qstring.h</a>>
#include <<a href="qobject-h.html">qobject.h</a>>
#include <<a href="qdatetime-h.html">qdatetime.h</a>>
#include <<a href="qptrlist-h.html">qptrlist.h</a>>
#include <<a href="qlistview-h.html">qlistview.h</a>>
class QListView;
class QLabel;
class QPainter;
class QColorGroup;
class QObjectList;
class QPopupMenu;
// -----------------------------------------------------------------
class MessageHeader
{
public:
MessageHeader( const <a href="qstring.html">QString</a> &_sender, const <a href="qstring.html">QString</a> &_subject, const <a href="qdatetime.html">QDateTime</a> &_datetime )
: msender( _sender ), msubject( _subject ), mdatetime( _datetime )
{}
MessageHeader( const MessageHeader &mh );
MessageHeader &operator=( const MessageHeader &mh );
<a href="qstring.html">QString</a> sender() { return msender; }
<a href="qstring.html">QString</a> subject() { return msubject; }
<a href="qdatetime.html">QDateTime</a> datetime() { return mdatetime; }
protected:
<a href="qstring.html">QString</a> msender, msubject;
<a href="qdatetime.html">QDateTime</a> mdatetime;
};
// -----------------------------------------------------------------
class Message
{
public:
enum State { Read = 0,
Unread};
Message( const MessageHeader &mh, const <a href="qstring.html">QString</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="qstring.html">QString</a> body() { return mbody; }
void setState( const State &s ) { mstate = s; }
State state() { return mstate; }
protected:
MessageHeader mheader;
<a href="qstring.html">QString</a> mbody;
State mstate;
};
// -----------------------------------------------------------------
class Folder : public <a href="qobject.html">QObject</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
Folder( Folder *parent, const <a href="qstring.html">QString</a> &name );
~Folder()
{}
void addMessage( Message *m )
<a name="x1200"></a> { lstMessages.<a href="qptrlist.html#append">append</a>( m ); }
<a href="qstring.html">QString</a> folderName() { return fName; }
<a name="x1201"></a> Message *firstMessage() { return lstMessages.<a href="qptrlist.html#first">first</a>(); }
<a name="x1202"></a> Message *nextMessage() { return lstMessages.<a href="qptrlist.html#next">next</a>(); }
protected:
<a href="qstring.html">QString</a> fName;
<a href="qptrlist.html">QPtrList</a><Message> lstMessages;
};
// -----------------------------------------------------------------
class FolderListItem : public <a href="qlistviewitem.html">QListViewItem</a>
{
public:
FolderListItem( <a href="qlistview.html">QListView</a> *parent, Folder *f );
FolderListItem( FolderListItem *parent, Folder *f );
void insertSubFolders( const QObjectList *lst );
Folder *folder() { return myFolder; }
protected:
Folder *myFolder;
};
// -----------------------------------------------------------------
class MessageListItem : public <a href="qlistviewitem.html">QListViewItem</a>
{
public:
MessageListItem( <a href="qlistview.html">QListView</a> *parent, Message *m );
virtual void paintCell( <a href="qpainter.html">QPainter</a> *p, const <a href="qcolorgroup.html">QColorGroup</a> &cg,
int column, int width, int alignment );
Message *message() { return myMessage; }
protected:
Message *myMessage;
};
// -----------------------------------------------------------------
class ListViews : public <a href="qsplitter.html">QSplitter</a>
{
Q_OBJECT
public:
ListViews( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
~ListViews()
{}
protected:
void initFolders();
void initFolder( Folder *folder, unsigned int &count );
void setupFolders();
<a href="qlistview.html">QListView</a> *messages, *folders;
<a href="qlabel.html">QLabel</a> *message;
<a href="qpopupmenu.html">QPopupMenu</a>* menu;
<a href="qptrlist.html">QPtrList</a><Folder> lstFolders;
protected slots:
void slotFolderChanged( <a href="qlistviewitem.html">QListViewItem</a>* );
void slotMessageChanged();
void slotRMB( <a href="qlistviewitem.html">QListViewItem</a>*, const <a href="qpoint.html">QPoint</a> &, int );
};
#endif
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/listviews.cpp 3.0.2 edited Feb 11 15:31 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "listviews.h"
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qpalette-h.html">qpalette.h</a>>
#include <qobjectlist.h>
#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
#include <<a href="qheader-h.html">qheader.h</a>>
#include <<a href="qregexp-h.html">qregexp.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="f370"></a>Folder::Folder( Folder *parent, const <a href="qstring.html">QString</a> &name )
: <a href="qobject.html">QObject</a>( parent, name ), fName( name )
{
lstMessages.setAutoDelete( TRUE );
}
// -----------------------------------------------------------------
<a name="f371"></a>FolderListItem::FolderListItem( <a href="qlistview.html">QListView</a> *parent, Folder *f )
: <a href="qlistviewitem.html">QListViewItem</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">QListViewItem</a>( parent )
{
myFolder = f;
<a href="qlistviewitem.html#setText">setText</a>( 0, f->folderName() );
if ( myFolder->children() )
insertSubFolders( myFolder->children() );
}
void <a name="f372"></a>FolderListItem::insertSubFolders( const QObjectList *lst )
{
Folder *f;
for ( f = ( Folder* )( ( QObjectList* )lst )->first(); f; f = ( Folder* )( ( QObjectList* )lst )->next() )
(void)new FolderListItem( this, f );
}
// -----------------------------------------------------------------
<a name="f380"></a>MessageListItem::MessageListItem( <a href="qlistview.html">QListView</a> *parent, Message *m )
: <a href="qlistviewitem.html">QListViewItem</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="x1226"></a>void MessageListItem::<a href="qlistviewitem.html#paintCell">paintCell</a>( <a href="qpainter.html">QPainter</a> *p, const <a href="qcolorgroup.html">QColorGroup</a> &cg,
int column, int width, int alignment )
{
<a href="qcolorgroup.html">QColorGroup</a> _cg( cg );
<a name="x1204"></a> <a href="qcolor.html">QColor</a> c = _cg.<a href="qcolorgroup.html#text">text</a>();
if ( myMessage->state() == Message::Unread )
<a name="x1203"></a> _cg.<a href="qcolorgroup.html#setColor">setColor</a>( QColorGroup::Text, Qt::red );
QListViewItem::<a href="qlistviewitem.html#paintCell">paintCell</a>( p, _cg, column, width, alignment );
_cg.<a href="qcolorgroup.html#setColor">setColor</a>( QColorGroup::Text, c );
}
// -----------------------------------------------------------------
<a name="f373"></a>ListViews::ListViews( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qsplitter.html">QSplitter</a>( Qt::Horizontal, parent, name )
{
lstFolders.setAutoDelete( TRUE );
folders = new <a href="qlistview.html">QListView</a>( this );
<a name="x1216"></a> folders-><a href="qlistview.html#header">header</a>()->setClickEnabled( FALSE );
<a name="x1210"></a> folders-><a href="qlistview.html#addColumn">addColumn</a>( "Folder" );
initFolders();
setupFolders();
<a name="x1221"></a> folders-><a href="qlistview.html#setRootIsDecorated">setRootIsDecorated</a>( TRUE );
<a href="qsplitter.html#setResizeMode">setResizeMode</a>( folders, QSplitter::KeepSize );
<a href="qsplitter.html">QSplitter</a> *vsplitter = new <a href="qsplitter.html">QSplitter</a>( Qt::Vertical, this );
messages = new <a href="qlistview.html">QListView</a>( vsplitter );
messages-><a href="qlistview.html#addColumn">addColumn</a>( "Sender" );
messages-><a href="qlistview.html#addColumn">addColumn</a>( "Subject" );
messages-><a href="qlistview.html#addColumn">addColumn</a>( "Date" );
<a name="x1219"></a> messages-><a href="qlistview.html#setColumnAlignment">setColumnAlignment</a>( 1, Qt::AlignRight );
<a name="x1218"></a> messages-><a href="qlistview.html#setAllColumnsShowFocus">setAllColumnsShowFocus</a>( TRUE );
<a name="x1224"></a> messages-><a href="qlistview.html#setShowSortIndicator">setShowSortIndicator</a>( TRUE );
menu = new <a href="qpopupmenu.html">QPopupMenu</a>( messages );
for( int i = 1; i <= 10; i++ )
menu-><a href="qmenudata.html#insertItem">insertItem</a>( QString( "Context Item %1" ).arg( i ) );
<a name="x1212"></a> <a href="qobject.html#connect">connect</a>(messages, SIGNAL( <a href="qlistview.html#contextMenuRequested">contextMenuRequested</a>( <a href="qlistviewitem.html">QListViewItem</a> *, const <a href="qpoint.html">QPoint</a>& , int ) ),
this, SLOT( slotRMB( <a href="qlistviewitem.html">QListViewItem</a> *, const <a href="qpoint.html">QPoint</a> &, int ) ) );
<a name="x1230"></a> vsplitter-><a href="qsplitter.html#setResizeMode">setResizeMode</a>( messages, QSplitter::KeepSize );
message = new <a href="qlabel.html">QLabel</a>( vsplitter );
<a name="x1208"></a> message-><a href="qlabel.html#setAlignment">setAlignment</a>( Qt::AlignTop );
<a name="x1232"></a> message-><a href="qwidget.html#setBackgroundMode">setBackgroundMode</a>( PaletteBase );
<a name="x1217"></a> <a href="qobject.html#connect">connect</a>( folders, SIGNAL( <a href="qlistview.html#selectionChanged">selectionChanged</a>( <a href="qlistviewitem.html">QListViewItem</a>* ) ),
this, SLOT( slotFolderChanged( <a href="qlistviewitem.html">QListViewItem</a>* ) ) );
<a href="qobject.html#connect">connect</a>( messages, SIGNAL( <a href="qlistview.html#selectionChanged">selectionChanged</a>() ),
this, SLOT( slotMessageChanged() ) );
<a name="x1213"></a> <a href="qobject.html#connect">connect</a>( messages, SIGNAL( <a href="qlistview.html#currentChanged">currentChanged</a>( <a href="qlistviewitem.html">QListViewItem</a> * ) ),
this, SLOT( slotMessageChanged() ) );
<a name="x1223"></a> messages-><a href="qlistview.html#setSelectionMode">setSelectionMode</a>( QListView::Extended );
// some preperationes
<a name="x1215"></a> folders-><a href="qlistview.html#firstChild">firstChild</a>()->setOpen( TRUE );
folders-><a href="qlistview.html#firstChild">firstChild</a>()->firstChild()->setOpen( TRUE );
<a name="x1220"></a> folders-><a href="qlistview.html#setCurrentItem">setCurrentItem</a>( folders-><a href="qlistview.html#firstChild">firstChild</a>()->firstChild()->firstChild() );
<a name="x1222"></a> folders-><a href="qlistview.html#setSelected">setSelected</a>( folders-><a href="qlistview.html#firstChild">firstChild</a>()->firstChild()->firstChild(), TRUE );
messages-><a href="qlistview.html#setSelected">setSelected</a>( messages-><a href="qlistview.html#firstChild">firstChild</a>(), TRUE );
messages-><a href="qlistview.html#setCurrentItem">setCurrentItem</a>( messages-><a href="qlistview.html#firstChild">firstChild</a>() );
<a name="x1207"></a> message-><a href="qframe.html#setMargin">setMargin</a>( 5 );
<a href="qvaluelist.html">QValueList</a><int> lst;
<a name="x1229"></a> lst.<a href="qvaluelist.html#append">append</a>( 170 );
<a href="qsplitter.html#setSizes">setSizes</a>( lst );
}
void <a name="f374"></a>ListViews::initFolders()
{
unsigned int mcount = 1;
for ( unsigned int i = 1; i < 20; i++ ) {
<a href="qstring.html">QString</a> str;
str = QString( "Folder %1" ).arg( i );
Folder *f = new Folder( 0, str );
for ( unsigned int j = 1; j < 5; j++ ) {
<a href="qstring.html">QString</a> str2;
str2 = QString( "Sub Folder %1" ).arg( j );
Folder *f2 = new Folder( f, str2 );
for ( unsigned int k = 1; k < 3; k++ ) {
<a href="qstring.html">QString</a> str3;
str3 = QString( "Sub Sub Folder %1" ).arg( k );
Folder *f3 = new Folder( f2, str3 );
initFolder( f3, mcount );
}
}
lstFolders.append( f );
}
}
void <a name="f375"></a>ListViews::initFolder( Folder *folder, unsigned int &count )
{
for ( unsigned int i = 0; i < 15; i++, count++ ) {
<a href="qstring.html">QString</a> str;
str = QString( "Message %1 " ).arg( count );
<a name="x1206"></a> <a href="qdatetime.html">QDateTime</a> dt = QDateTime::<a href="qdatetime.html#currentDateTime">currentDateTime</a>();
<a name="x1205"></a> dt = dt.<a href="qdatetime.html#addSecs">addSecs</a>( 60 * count );
MessageHeader mh( "Trolltech <info@trolltech.com> ", str, dt );
<a href="qstring.html">QString</a> body;
body = QString( "This is the message number %1 of this application, \n"
"which shows how to use QListViews, QListViewItems, \n"
"QSplitters and so on. The code should show how easy\n"
"this can be done in Qt." ).arg( count );
Message *msg = new Message( mh, body );
folder->addMessage( msg );
}
}
void <a name="f376"></a>ListViews::setupFolders()
{
<a name="x1211"></a> folders-><a href="qlistview.html#clear">clear</a>();
for ( Folder* f = lstFolders.first(); f; f = lstFolders.next() )
(void)new FolderListItem( folders, f );
}
void <a name="f377"></a>ListViews::slotRMB( <a href="qlistviewitem.html">QListViewItem</a>* Item, const <a href="qpoint.html">QPoint</a> & point, int )
{
if( Item )
<a name="x1228"></a> menu-><a href="qpopupmenu.html#popup">popup</a>( point );
}
void <a name="f378"></a>ListViews::slotFolderChanged( <a href="qlistviewitem.html">QListViewItem</a> *i )
{
if ( !i )
return;
messages-><a href="qlistview.html#clear">clear</a>();
<a name="x1209"></a> message-><a href="qlabel.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="f379"></a>ListViews::slotMessageChanged()
{
<a name="x1214"></a> <a href="qlistviewitem.html">QListViewItem</a> *i = messages-><a href="qlistview.html#currentItem">currentItem</a>();
if ( !i )
return;
<a name="x1225"></a> if ( !i-><a href="qlistviewitem.html#isSelected">isSelected</a>() ) {
message-><a href="qlabel.html#setText">setText</a>( "" );
return;
}
MessageListItem *item = ( MessageListItem* )i;
Message *msg = item->message();
<a href="qstring.html">QString</a> text;
<a href="qstring.html">QString</a> tmp = msg->header().sender();
<a name="x1231"></a> tmp = tmp.<a href="qstring.html#replace">replace</a>( QRegExp( "<" ), "&lt;" );
tmp = tmp.<a href="qstring.html#replace">replace</a>( QRegExp( ">" ), "&gt;" );
text = QString( "<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="qlabel.html#setText">setText</a>( text );
msg->setState( Message::Read );
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.0.2 edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "listviews.h"
#include <<a href="qapplication-h.html">qapplication.h</a>>
int main( int argc, char **argv )
{
<a href="qapplication.html">QApplication</a> a( argc, argv );
ListViews listViews;
listViews.<a href="qwidget.html#resize">resize</a>( 640, 480 );
<a name="x1236"></a> listViews.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Listview" );
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &listViews );
listViews.<a href="qwidget.html#show">show</a>();
return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
<!-- eof -->
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<table width=100% cellspacing=0 border=0><tr>
<td>Copyright © 2001
<a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt version 3.0.2</div>
</table></div></address></body>
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