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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 3.3.8 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 >
