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<title>Listboxes and Comboboxes</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>Listboxes and Comboboxes</h1>
<p>
This example program demonstrates how to use listboxes (with single selection
and multi selection) and comboboxes (editable and non-editable).
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/listboxcombo.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 Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef LISTBOX_COMBO_H
#define LISTBOX_COMBO_H
#include <<a href="qvbox-h.html">qvbox.h</a>>
class QListBox;
class QLabel;
class ListBoxCombo : public <a href="qvbox.html">QVBox</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
ListBoxCombo( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
protected:
<a href="qlistbox.html">QListBox</a> *lb1, *lb2;
<a href="qlabel.html">QLabel</a> *label1, *label2;
protected slots:
void slotLeft2Right();
void slotCombo1Activated( const <a href="qstring.html">QString</a> &s );
void slotCombo2Activated( const <a href="qstring.html">QString</a> &s );
};
#endif
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/listboxcombo.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 Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "listboxcombo.h"
#include <<a href="qcombobox-h.html">qcombobox.h</a>>
#include <<a href="qlistbox-h.html">qlistbox.h</a>>
#include <<a href="qhbox-h.html">qhbox.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
#include <<a href="qstring-h.html">qstring.h</a>>
#include <<a href="qpixmap-h.html">qpixmap.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qimage-h.html">qimage.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qstyle-h.html">qstyle.h</a>>
class MyListBoxItem : public <a href="qlistboxitem.html">QListBoxItem</a>
{
public:
MyListBoxItem()
: <a href="qlistboxitem.html">QListBoxItem</a>()
{
setCustomHighlighting( TRUE );
}
protected:
virtual void paint( <a href="qpainter.html">QPainter</a> * );
virtual int width( const <a href="qlistbox.html">QListBox</a>* ) const { return 100; }
virtual int height( const <a href="qlistbox.html">QListBox</a>* ) const { return 16; }
};
<a name="x1410"></a>void MyListBoxItem::<a href="qlistboxitem.html#paint">paint</a>( <a href="qpainter.html">QPainter</a> *painter )
{
// evil trick: find out whether we are painted onto our listbox
<a name="x1413"></a> bool in_list_box = <a href="qlistboxitem.html#listBox">listBox</a>() && listBox()->viewport() == painter-><a href="qpainter.html#device">device</a>();
<a href="qrect.html">QRect</a> r ( 0, 0, width( <a href="qlistboxitem.html#listBox">listBox</a>() ), height( <a href="qlistboxitem.html#listBox">listBox</a>() ) );
if ( in_list_box && isSelected() )
<a name="x1414"></a> painter-><a href="qpainter.html#eraseRect">eraseRect</a>( r );
<a name="x1415"></a> painter-><a href="qpainter.html#fillRect">fillRect</a>( 5, 5, width( listBox() ) - 10, height( listBox() ) - 10, Qt::red );
if ( in_list_box && isCurrent() )
listBox()->style().drawPrimitive( QStyle::PE_FocusRect, painter, r, listBox()->colorGroup() );
}
/*
* Constructor
*
* Creates child widgets of the ListBoxCombo widget
*/
<a name="f437"></a>ListBoxCombo::ListBoxCombo( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qvbox.html">QVBox</a>( parent, name )
{
<a href="qframe.html#setMargin">setMargin</a>( 5 );
<a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
unsigned int i;
<a href="qstring.html">QString</a> str;
<a href="qhbox.html">QHBox</a> *row1 = new <a href="qhbox.html">QHBox</a>( this );
<a name="x1402"></a> row1-><a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
// Create a multi-selection ListBox...
lb1 = new <a href="qlistbox.html">QListBox</a>( row1 );
<a name="x1408"></a> lb1-><a href="qlistbox.html#setSelectionMode">setSelectionMode</a>( QListBox::Multi );
// ...insert a pixmap item...
<a name="x1406"></a> lb1-><a href="qlistbox.html#insertItem">insertItem</a>( QPixmap( "qtlogo.png" ) );
// ...and 100 text items
for ( i = 0; i < 100; i++ ) {
str = QString( "Listbox Item %1" ).arg( i );
if ( !( i % 4 ) )
lb1-><a href="qlistbox.html#insertItem">insertItem</a>( QPixmap( "fileopen.xpm" ), str );
else
lb1-><a href="qlistbox.html#insertItem">insertItem</a>( str );
}
// Create a pushbutton...
<a href="qpushbutton.html">QPushButton</a> *arrow1 = new <a href="qpushbutton.html">QPushButton</a>( " -> ", row1 );
// ...and connect the clicked SIGNAL with the SLOT slotLeft2Right
<a href="qobject.html#connect">connect</a>( arrow1, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( slotLeft2Right() ) );
// create an empty single-selection ListBox
lb2 = new <a href="qlistbox.html">QListBox</a>( row1 );
<a href="qhbox.html">QHBox</a> *row2 = new <a href="qhbox.html">QHBox</a>( this );
row2-><a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
<a href="qvbox.html">QVBox</a> *box1 = new <a href="qvbox.html">QVBox</a>( row2 );
box1-><a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
// Create a non-editable Combobox and a label below...
<a href="qcombobox.html">QComboBox</a> *cb1 = new <a href="qcombobox.html">QComboBox</a>( FALSE, box1 );
label1 = new <a href="qlabel.html">QLabel</a>( "Current Item: Combobox Item 0", box1 );
<a name="x1416"></a><a name="x1404"></a> label1-><a href="qwidget.html#setMaximumHeight">setMaximumHeight</a>( label1-><a href="qwidget.html#sizeHint">sizeHint</a>().height() * 2 );
<a name="x1401"></a> label1-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Sunken );
//...and insert 50 items into the Combobox
for ( i = 0; i < 50; i++ ) {
str = QString( "Combobox Item %1" ).arg( i );
if ( i % 9 )
<a name="x1399"></a> cb1-><a href="qcombobox.html#insertItem">insertItem</a>( str );
else
<a name="x1400"></a> cb1-><a href="qcombobox.html#listBox">listBox</a>()->insertItem( new MyListBoxItem );
}
<a href="qvbox.html">QVBox</a> *box2 = new <a href="qvbox.html">QVBox</a>( row2 );
box2-><a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
// Create an editable Combobox and a label below...
<a href="qcombobox.html">QComboBox</a> *cb2 = new <a href="qcombobox.html">QComboBox</a>( TRUE, box2 );
label2 = new <a href="qlabel.html">QLabel</a>( "Current Item: Combobox Item 0", box2 );
label2-><a href="qwidget.html#setMaximumHeight">setMaximumHeight</a>( label2-><a href="qwidget.html#sizeHint">sizeHint</a>().height() * 2 );
label2-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Sunken );
// ... and insert 50 items into the Combobox
for ( i = 0; i < 50; i++ ) {
str = QString( "Combobox Item %1" ).arg( i );
if ( !( i % 4 ) )
cb2-><a href="qcombobox.html#insertItem">insertItem</a>( QPixmap( "fileopen.xpm" ), str );
else
cb2-><a href="qcombobox.html#insertItem">insertItem</a>( str );
}
// Connect the activated SIGNALs of the Comboboxes with SLOTs
<a name="x1398"></a> <a href="qobject.html#connect">connect</a>( cb1, SIGNAL( <a href="qcombobox.html#activated">activated</a>( const <a href="qstring.html">QString</a> & ) ), this, SLOT( slotCombo1Activated( const <a href="qstring.html">QString</a> & ) ) );
<a href="qobject.html#connect">connect</a>( cb2, SIGNAL( <a href="qcombobox.html#activated">activated</a>( const <a href="qstring.html">QString</a> & ) ), this, SLOT( slotCombo2Activated( const <a href="qstring.html">QString</a> & ) ) );
}
/*
* SLOT slotLeft2Right
*
* Copies all selected items of the first ListBox into the
* second ListBox
*/
void <a name="f438"></a>ListBoxCombo::slotLeft2Right()
{
// Go through all items of the first ListBox
<a name="x1405"></a> for ( unsigned int i = 0; i < lb1-><a href="qlistbox.html#count">count</a>(); i++ ) {
<a name="x1407"></a> <a href="qlistboxitem.html">QListBoxItem</a> *item = lb1-><a href="qlistbox.html#item">item</a>( i );
// if the item is selected...
<a name="x1409"></a> if ( item-><a href="qlistboxitem.html#isSelected">isSelected</a>() ) {
// ...and it is a text item...
<a name="x1412"></a><a name="x1411"></a> if ( item-><a href="qlistboxitem.html#pixmap">pixmap</a>() && !item-><a href="qlistboxitem.html#text">text</a>().isEmpty() )
lb2-><a href="qlistbox.html#insertItem">insertItem</a>( *item-><a href="qlistboxitem.html#pixmap">pixmap</a>(), item-><a href="qlistboxitem.html#text">text</a>() );
else if ( !item-><a href="qlistboxitem.html#pixmap">pixmap</a>() )
lb2-><a href="qlistbox.html#insertItem">insertItem</a>( item-><a href="qlistboxitem.html#text">text</a>() );
else if ( item-><a href="qlistboxitem.html#text">text</a>().isEmpty() )
lb2-><a href="qlistbox.html#insertItem">insertItem</a>( *item-><a href="qlistboxitem.html#pixmap">pixmap</a>() );
}
}
}
/*
* SLOT slotCombo1Activated( const <a href="qstring.html">QString</a> &s )
*
* Sets the text of the item which the user just selected
* in the first Combobox (and is now the value of s) to
* the first Label.
*/
void <a name="f439"></a>ListBoxCombo::slotCombo1Activated( const <a href="qstring.html">QString</a> &s )
{
<a name="x1403"></a> label1-><a href="qlabel.html#setText">setText</a>( QString( "Current Item: %1" ).arg( s ) );
}
/*
* SLOT slotCombo2Activated( const <a href="qstring.html">QString</a> &s )
*
* Sets the text of the item which the user just selected
* in the second Combobox (and is now the value of s) to
* the second Label.
*/
void <a name="f440"></a>ListBoxCombo::slotCombo2Activated( const <a href="qstring.html">QString</a> &s )
{
label2-><a href="qlabel.html#setText">setText</a>( QString( "Current Item: %1" ).arg( s ) );
}
</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 Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "listboxcombo.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 );
ListBoxCombo listboxcombo;
listboxcombo.<a href="qwidget.html#resize">resize</a>( 400, 270 );
listboxcombo.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Listboxes and Comboboxes" );
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &listboxcombo );
listboxcombo.<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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