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<title>Listviews with Checkable Items</title>
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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 with Checkable Items</h1>
<p>
This example program shows how to use listviews with different types of
checkable items.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/checklists.h 3.1.1 edited Nov 8 10:35 $
**
** 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 CHECKLISTS_H
#define CHECKLISTS_H
#include <<a href="qwidget-h.html">qwidget.h</a>>
class QListView;
class QLabel;
class CheckLists : public <a href="qwidget.html">QWidget</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
CheckLists( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
protected:
<a href="qlistview.html">QListView</a> *lv1, *lv2;
<a href="qlabel.html">QLabel</a> *label;
protected slots:
void copy1to2();
void copy2to3();
};
#endif
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/checklists.cpp 3.1.1 edited Nov 8 10:35 $
**
** 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 "checklists.h"
#include <<a href="qlistview-h.html">qlistview.h</a>>
#include <<a href="qvbox-h.html">qvbox.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qvaluelist-h.html">qvaluelist.h</a>>
#include <<a href="qstring-h.html">qstring.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
#include <<a href="qlayout-h.html">qlayout.h</a>>
/*
* Constructor
*
* Create all child widgets of the CheckList Widget
*/
<a name="f234"></a>CheckLists::CheckLists( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qwidget.html">QWidget</a>( parent, name )
{
<a href="qhboxlayout.html">QHBoxLayout</a> *lay = new <a href="qhboxlayout.html">QHBoxLayout</a>( this );
<a name="x359"></a> lay-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
// create a widget which layouts its childs in a column
<a href="qvboxlayout.html">QVBoxLayout</a> *vbox1 = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
vbox1-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
// First child: a Label
<a name="x356"></a> vbox1-><a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Check some items!", this ) );
// Second child: the ListView
lv1 = new <a href="qlistview.html">QListView</a>( this );
vbox1-><a href="qboxlayout.html#addWidget">addWidget</a>( lv1 );
<a name="x360"></a> lv1-><a href="qlistview.html#addColumn">addColumn</a>( "Items" );
<a name="x362"></a> lv1-><a href="qlistview.html#setRootIsDecorated">setRootIsDecorated</a>( TRUE );
// create a list with 4 ListViewItems which will be parent items of other ListViewItems
<a href="qvaluelist.html">QValueList</a><QListViewItem *> parentList;
<a name="x367"></a> parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qlistviewitem.html">QListViewItem</a>( lv1, "Parent Item 1" ) );
parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qlistviewitem.html">QListViewItem</a>( lv1, "Parent Item 2" ) );
parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qlistviewitem.html">QListViewItem</a>( lv1, "Parent Item 3" ) );
parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qlistviewitem.html">QListViewItem</a>( lv1, "Parent Item 4" ) );
<a href="qlistviewitem.html">QListViewItem</a> *item = 0;
unsigned int num = 1;
// go through the list of parent items...
<a name="x369"></a><a name="x368"></a> for ( QValueList<QListViewItem*>::Iterator it = parentList.<a href="qvaluelist.html#begin">begin</a>(); it != parentList.<a href="qvaluelist.html#end">end</a>();
( *it )->setOpen( TRUE ), ++it, num++ ) {
item = *it;
// ...and create 5 checkable child ListViewItems for each parent item
for ( unsigned int i = 1; i <= 5; i++ )
(void)new <a href="qchecklistitem.html">QCheckListItem</a>( item, QString( "%1. Child of Parent %2" ).arg( i ).arg( num ), QCheckListItem::CheckBox );
}
// Create another widget for layouting
<a href="qvboxlayout.html">QVBoxLayout</a> *tmp = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
tmp-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
// create a pushbutton
<a href="qpushbutton.html">QPushButton</a> *copy1 = new <a href="qpushbutton.html">QPushButton</a>( " -> ", this );
tmp-><a href="qboxlayout.html#addWidget">addWidget</a>( copy1 );
<a name="x370"></a><a name="x366"></a> copy1-><a href="qwidget.html#setMaximumWidth">setMaximumWidth</a>( copy1-><a href="qwidget.html#sizeHint">sizeHint</a>().width() );
// connect the SIGNAL clicked() of the pushbutton with the SLOT copy1to2()
<a href="qobject.html#connect">connect</a>( copy1, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( copy1to2() ) );
// another widget for layouting
<a href="qvboxlayout.html">QVBoxLayout</a> *vbox2 = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
vbox2-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
// and another label
vbox2-><a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Check one item!", this ) );
// create the second listview
lv2 = new <a href="qlistview.html">QListView</a>( this );
vbox2-><a href="qboxlayout.html#addWidget">addWidget</a>( lv2 );
lv2-><a href="qlistview.html#addColumn">addColumn</a>( "Items" );
lv2-><a href="qlistview.html#setRootIsDecorated">setRootIsDecorated</a>( TRUE );
// another widget needed for layouting only
tmp = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
tmp-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
// create another pushbutton...
<a href="qpushbutton.html">QPushButton</a> *copy2 = new <a href="qpushbutton.html">QPushButton</a>( " -> ", this );
lay-><a href="qboxlayout.html#addWidget">addWidget</a>( copy2 );
copy2-><a href="qwidget.html#setMaximumWidth">setMaximumWidth</a>( copy2-><a href="qwidget.html#sizeHint">sizeHint</a>().width() );
// ...and connect its clicked() SIGNAL to the copy2to3() SLOT
<a href="qobject.html#connect">connect</a>( copy2, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( copy2to3() ) );
tmp = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
tmp-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
// and create a label which will be at the right of the window
label = new <a href="qlabel.html">QLabel</a>( "No Item yet...", this );
tmp-><a href="qboxlayout.html#addWidget">addWidget</a>( label );
}
/*
* SLOT copy1to2()
*
* Copies all checked ListViewItems from the first ListView to
* the second one, and inserts them as Radio-ListViewItem.
*/
void <a name="f235"></a>CheckLists::copy1to2()
{
// create an iterator which operates on the first ListView
<a href="qlistviewitemiterator.html">QListViewItemIterator</a> it( lv1 );
<a name="x361"></a> lv2-><a href="qlistview.html#clear">clear</a>();
// Insert first a controller Item into the second ListView. Always if Radio-ListViewItems
// are inserted into a Listview, the parent item of these MUST be a controller Item!
<a href="qchecklistitem.html">QCheckListItem</a> *item = new <a href="qchecklistitem.html">QCheckListItem</a>( lv2, "Controller", QCheckListItem::Controller );
<a name="x364"></a> item-><a href="qlistviewitem.html#setOpen">setOpen</a>( TRUE );
// iterate through the first ListView...
<a name="x365"></a> for ( ; it.<a href="qlistviewitemiterator.html#current">current</a>(); ++it )
// ...check state of childs, and...
if ( it.<a href="qlistviewitemiterator.html#current">current</a>()->parent() )
// ...if the item is checked...
if ( ( (QCheckListItem*)it.<a href="qlistviewitemiterator.html#current">current</a>() )->isOn() )
// ...insert a Radio-ListViewItem with the same text into the second ListView
(void)new <a href="qchecklistitem.html">QCheckListItem</a>( item, it.<a href="qlistviewitemiterator.html#current">current</a>()->text( 0 ), QCheckListItem::RadioButton );
<a name="x363"></a> if ( item-><a href="qlistviewitem.html#firstChild">firstChild</a>() )
( ( <a href="qchecklistitem.html">QCheckListItem</a>* )item-><a href="qlistviewitem.html#firstChild">firstChild</a>() )->setOn( TRUE );
}
/*
* SLOT copy2to3()
*
* Copies the checked item of the second ListView into the
* Label at the right.
*/
void <a name="f236"></a>CheckLists::copy2to3()
{
// create an iterator which operates on the second ListView
<a href="qlistviewitemiterator.html">QListViewItemIterator</a> it( lv2 );
label-><a href="qlabel.html#setText">setText</a>( "No Item checked" );
// iterate through the second ListView...
for ( ; it.<a href="qlistviewitemiterator.html#current">current</a>(); ++it )
// ...check state of childs, and...
if ( it.<a href="qlistviewitemiterator.html#current">current</a>()->parent() )
// ...if the item is checked...
if ( ( (QCheckListItem*)it.<a href="qlistviewitemiterator.html#current">current</a>() )->isOn() )
// ...set the text of the item to the label
label-><a href="qlabel.html#setText">setText</a>( it.<a href="qlistviewitemiterator.html#current">current</a>()->text( 0 ) );
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.1.1 edited Nov 8 10:35 $
**
** 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 "checklists.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 );
CheckLists checklists;
checklists.<a href="qwidget.html#resize">resize</a>( 650, 350 );
<a name="x374"></a> checklists.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - CheckLists" );
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &checklists );
checklists.<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>.
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