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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>
Qt Toolkit - listviews/main.cpp example file
</title><style type="text/css"><!--
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</head><body bgcolor="#ffffff">
<table width="100%">
<tr><td><a href="index.html">
<img width="100" height="100" src="qtlogo.png"
alt="Home" border="0"><img width="100"
height="100" src="face.png" alt="Home" border="0">
</a><td valign=top><div align=right><img src="dochead.png" width="472" height="27"><br>
<a href="classes.html"><b>Classes</b></a>
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</table>
<h1 align=center>Listviews</h1><br clear="all">
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 mainwindow of a mail client.
<hr>
Header file: <pre>/****************************************************************************
** $Id: qt/examples/listviews/listviews.h 2.3.2 edited 2001-01-26 $
**
** 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="qlist-h.html">qlist.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 QString &_sender, const QString &_subject, const QDateTime &_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 QString &_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 QObject
{
Q_OBJECT
public:
Folder( Folder *parent, const QString &name );
~Folder()
{}
void addMessage( Message *m )
{ lstMessages.<a href="qlist.html#c5746a">append</a>( m ); }
<a href="qstring.html">QString</a> folderName() { return fName; }
Message *firstMessage() { return lstMessages.<a href="qlist.html#e625f9">first</a>(); }
Message *nextMessage() { return lstMessages.<a href="qlist.html#f95ddd">next</a>(); }
protected:
<a href="qstring.html">QString</a> fName;
<a href="qlist.html">QList</a><Message> lstMessages;
};
// -----------------------------------------------------------------
class FolderListItem : public QListViewItem
{
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 QListViewItem
{
public:
MessageListItem( <a href="qlistview.html">QListView</a> *parent, Message *m );
virtual void paintCell( <a href="qpainter.html">QPainter</a> *p, const QColorGroup &cg,
int column, int width, int alignment );
Message *message() { return myMessage; }
protected:
Message *myMessage;
};
// -----------------------------------------------------------------
class ListViews : public QSplitter
{
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="qlist.html">QList</a><Folder> lstFolders;
protected slots:
void slotFolderChanged( <a href="qlistviewitem.html">QListViewItem</a>* );
void slotMessageChanged();
void slotRMB( <a href="qlistviewitem.html">QListViewItem</a>*, const QPoint &, int );
};
#endif
</pre>
<hr>
Implementation: <pre>/****************************************************************************
** $Id: qt/examples/listviews/listviews.cpp 2.3.2 edited 2001-05-25 $
**
** 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;
}
// -----------------------------------------------------------------
Folder::Folder( Folder *parent, const QString &name )
: <a href="qobject.html">QObject</a>( parent, name ), fName( name )
{
lstMessages.setAutoDelete( TRUE );
}
// -----------------------------------------------------------------
FolderListItem::FolderListItem( <a href="qlistview.html">QListView</a> *parent, Folder *f )
: <a href="qlistviewitem.html">QListViewItem</a>( parent )
{
myFolder = f;
<a href="qlistviewitem.html#808e84">setText</a>( 0, f->folderName() );
if ( myFolder->children() )
<a href=#92>insertSubFolders</a>( myFolder->children() );
}
FolderListItem::FolderListItem( FolderListItem *parent, Folder *f )
: <a href="qlistviewitem.html">QListViewItem</a>( parent )
{
myFolder = f;
<a href="qlistviewitem.html#808e84">setText</a>( 0, f->folderName() );
if ( myFolder->children() )
<a href=#92>insertSubFolders</a>( myFolder->children() );
}
void <a name="92"></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 );
}
// -----------------------------------------------------------------
MessageListItem::MessageListItem( <a href="qlistview.html">QListView</a> *parent, Message *m )
: <a href="qlistviewitem.html">QListViewItem</a>( parent )
{
myMessage = m;
<a href="qlistviewitem.html#808e84">setText</a>( 0, myMessage->header().sender() );
<a href="qlistviewitem.html#808e84">setText</a>( 1, myMessage->header().subject() );
<a href="qlistviewitem.html#808e84">setText</a>( 2, myMessage->header().datetime().toString() );
}
void <a name="85"></a>MessageListItem::paintCell( <a href="qpainter.html">QPainter</a> *p, const QColorGroup &cg,
int column, int width, int alignment )
{
<a href="qcolorgroup.html">QColorGroup</a> _cg( cg );
<a href="qcolor.html">QColor</a> c = _cg.<a href="qcolorgroup.html#ddea87">text</a>();
if ( myMessage->state() == Message::Unread )
_cg.<a href="qcolorgroup.html#73080d">setColor</a>( QColorGroup::Text, Qt::red );
<a href="qlistviewitem.html#0ab6b5">QListViewItem::paintCell</a>( p, _cg, column, width, alignment );
_cg.<a href="qcolorgroup.html#73080d">setColor</a>( QColorGroup::Text, c );
}
// -----------------------------------------------------------------
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 );
folders->header()->setClickEnabled( FALSE );
folders->addColumn( "Folder" );
<a href=#86>initFolders</a>();
<a href=#88>setupFolders</a>();
folders->setRootIsDecorated( TRUE );
<a href="qsplitter.html#33bf83">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->addColumn( "Sender" );
messages->addColumn( "Subject" );
messages->addColumn( "Date" );
messages->setColumnAlignment( 1, Qt::AlignRight );
messages->setAllColumnsShowFocus( TRUE );
messages->setShowSortIndicator( TRUE );
menu = new <a href="qpopupmenu.html">QPopupMenu</a>( messages );
for( int i = 1; i <= 10; i++ )
menu->insertItem( <a href="qstring.html">QString</a>( "Context Item %1" ).arg( i ) );
<a href="qobject.html#7f8e37">connect</a>(messages, SIGNAL( rightButtonPressed( <a href="qlistviewitem.html">QListViewItem</a> *, const QPoint& , int ) ),
this, SLOT( <a href=#89>slotRMB</a>( <a href="qlistviewitem.html">QListViewItem</a> *, const QPoint &, int ) ) );
vsplitter-><a href="qsplitter.html#33bf83">setResizeMode</a>( messages, QSplitter::KeepSize );
message = new <a href="qlabel.html">QLabel</a>( vsplitter );
message->setAlignment( Qt::AlignTop );
message->setBackgroundMode( PaletteBase );
<a href="qobject.html#7f8e37">connect</a>( folders, SIGNAL( selectionChanged( <a href="qlistviewitem.html">QListViewItem</a>* ) ),
this, SLOT( <a href=#90>slotFolderChanged</a>( <a href="qlistviewitem.html">QListViewItem</a>* ) ) );
<a href="qobject.html#7f8e37">connect</a>( messages, SIGNAL( selectionChanged() ),
this, SLOT( <a href=#91>slotMessageChanged</a>() ) );
<a href="qobject.html#7f8e37">connect</a>( messages, SIGNAL( currentChanged( <a href="qlistviewitem.html">QListViewItem</a> * ) ),
this, SLOT( <a href=#91>slotMessageChanged</a>() ) );
messages->setSelectionMode( QListView::Extended );
// some preparations
folders->firstChild()->setOpen( TRUE );
folders->firstChild()->firstChild()->setOpen( TRUE );
folders->setCurrentItem( folders->firstChild()->firstChild()->firstChild() );
folders->setSelected( folders->firstChild()->firstChild()->firstChild(), TRUE );
messages->setSelected( messages->firstChild(), TRUE );
messages->setCurrentItem( messages->firstChild() );
message->setMargin( 5 );
<a href="qvaluelist.html">QValueList</a><int> lst;
lst.<a href="qvaluelist.html#d68b11">append</a>( 170 );
<a href="qsplitter.html#8fd8cf">setSizes</a>( lst );
}
void <a name="86"></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 );
<a href=#87>initFolder</a>( f3, mcount );
}
}
lstFolders.append( f );
}
}
void <a name="87"></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 href="qdatetime.html">QDateTime</a> dt = QDateTime::currentDateTime();
dt = dt.<a href="qdatetime.html#a8711a">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="88"></a>ListViews::setupFolders()
{
folders->clear();
for ( Folder* f = lstFolders.first(); f; f = lstFolders.next() )
(void)new FolderListItem( folders, f );
}
void <a name="89"></a>ListViews::slotRMB( <a href="qlistviewitem.html">QListViewItem</a>* Item, const QPoint & point, int )
{
if( Item )
menu->popup( point );
}
void <a name="90"></a>ListViews::slotFolderChanged( <a href="qlistviewitem.html">QListViewItem</a> *i )
{
if ( !i )
return;
messages->clear();
message->setText( "" );
FolderListItem *item = ( FolderListItem* )i;
for ( Message* msg = item->folder()->firstMessage(); msg;
msg = item->folder()->nextMessage() )
(void)new MessageListItem( messages, msg );
}
void <a name="91"></a>ListViews::slotMessageChanged()
{
<a href="qlistviewitem.html">QListViewItem</a> *i = messages->currentItem();
if ( !i )
return;
if ( !i-><a href="qlistviewitem.html#35710b">isSelected</a>() ) {
message->setText( "" );
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();
tmp = tmp.<a href="qstring.html#034e6e">replace</a>( <a href="qregexp.html">QRegExp</a>( "[<]" ), "&lt;" );
tmp = tmp.<a href="qstring.html#034e6e">replace</a>( <a href="qregexp.html">QRegExp</a>( "[>]" ), "&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->setText( text );
msg->setState( Message::Read );
}
</pre>
<hr>
Main:
<pre>/****************************************************************************
** $Id: qt/examples/listviews/main.cpp 2.3.2 edited 2001-06-12 $
**
** 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 name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>
int main( int argc, char **argv )
{
<a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv );
ListViews listViews;
listViews.<a name="resize"></a><a href="qwidget.html#ff9d07">resize</a>( 640, 480 );
listViews.<a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>( "Qt Example - Listview" );
a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( &listViews );
listViews.<a name="show"></a><a href="qwidget.html#200ee5">show</a>();
return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
}
</pre>
<p><address><hr><div align="center">
<table width="100%" cellspacing="0" border="0"><tr>
<td>Copyright 2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.2</div>
</table></div></address></body></html>
|
