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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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Qt Toolkit - listboxcombo/main.cpp example file
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<h1 align=center>Listboxes and Comboboxes</h1><br clear="all">
This example program demonstrates how to use Listboxes (with single selection
and multi selection) and Comboboxes (editable and non-editable).
<hr>
Header file: <pre>/****************************************************************************
** $Id: qt/examples/listboxcombo/listboxcombo.h 2.3.1 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 LISTBOX_COMBO_H
#define LISTBOX_COMBO_H
#include <<a href="qvbox-h.html">qvbox.h</a>>
class QListBox;
class QLabel;
class ListBoxCombo : public QVBox
{
Q_OBJECT
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 QString &s );
void slotCombo2Activated( const QString &s );
};
#endif
</pre>
<hr>
Implementation: <pre>/****************************************************************************
** $Id: qt/examples/listboxcombo/listboxcombo.cpp 2.3.1 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.
**
*****************************************************************************/
#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>>
class MyListBoxItem : public QListBoxItem
{
public:
MyListBoxItem()
: <a href="qlistboxitem.html">QListBoxItem</a>()
{
setCustomHighlighting( TRUE );
}
protected:
virtual void paint( <a href="qpainter.html">QPainter</a> * );
virtual int width( const QListBox* ) const { return 100; }
virtual int height( const QListBox* ) const { return 16; }
};
void <a name="376"></a>MyListBoxItem::paint( <a href="qpainter.html">QPainter</a> *painter )
{
// evil trick: find out whether we are painted onto our listbox
bool in_list_box = listBox() && listBox()->viewport() == painter-><a href="qpainter.html#84abcf">device</a>();
<a href="qrect.html">QRect</a> r ( 0, 0, <a href="qlistboxitem.html#8ff2cf">width</a>( listBox() ), <a href="qlistboxitem.html#bf15d8">height</a>( listBox() ) );
if ( in_list_box && selected() )
painter-><a href="qpainter.html#aa2595">eraseRect</a>( r );
painter-><a href="qpainter.html#0f4c23">fillRect</a>( 5, 5, <a href="qlistboxitem.html#8ff2cf">width</a>( listBox() ) - 10, <a href="qlistboxitem.html#bf15d8">height</a>( listBox() ) - 10, Qt::red );
if ( in_list_box && current() )
<a href="qlistboxitem.html#476e10">listBox</a>()->style().drawFocusRect( painter, r, <a href="qlistboxitem.html#476e10">listBox</a>()->colorGroup(), &painter-><a href="qpainter.html#09f5ca">backgroundColor</a>(), TRUE );
}
/*
* Constructor
*
* Creates child widgets of the ListBoxCombo widget
*/
ListBoxCombo::ListBoxCombo( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qvbox.html">QVBox</a>( parent, name )
{
<a href="qframe.html#ab991e">setMargin</a>( 5 );
<a href="qhbox.html#d8c6a6">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 );
row1-><a href="qhbox.html#d8c6a6">setSpacing</a>( 5 );
// Create a multi-selection ListBox...
lb1 = new <a href="qlistbox.html">QListBox</a>( row1 );
lb1->setSelectionMode( QListBox::Multi );
// ...insert a pixmap item...
lb1->insertItem( <a href="qpixmap.html">QPixmap</a>( "qtlogo.png" ) );
// ...and 100 text items
for ( i = 0; i < 100; i++ ) {
str = QString( "Listbox Item %1" ).arg( i );
if ( !( i % 4 ) )
lb1->insertItem( <a href="qpixmap.html">QPixmap</a>( "fileopen.xpm" ), str );
else
lb1->insertItem( 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#c2d209">connect</a>( arrow1, SIGNAL( clicked() ), this, SLOT( <a href=#377>slotLeft2Right</a>() ) );
// 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#d8c6a6">setSpacing</a>( 5 );
<a href="qvbox.html">QVBox</a> *box1 = new <a href="qvbox.html">QVBox</a>( row2 );
box1-><a href="qhbox.html#d8c6a6">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 );
label1->setMaximumHeight( label1->sizeHint().height() * 2 );
label1->setFrameStyle( 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 )
cb1-><a href="qcombobox.html#bd8981">insertItem</a>( str );
else
cb1-><a href="qcombobox.html#0c879c">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#d8c6a6">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->setMaximumHeight( label2->sizeHint().height() * 2 );
label2->setFrameStyle( 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#bd8981">insertItem</a>( <a href="qpixmap.html">QPixmap</a>( "fileopen.xpm" ), str );
else
cb2-><a href="qcombobox.html#bd8981">insertItem</a>( str );
}
// Connect the activated SIGNALs of the Comboboxes with SLOTs
<a href="qobject.html#c2d209">connect</a>( cb1, SIGNAL( activated( const QString & ) ), this, SLOT( <a href=#378>slotCombo1Activated</a>( const QString & ) ) );
<a href="qobject.html#c2d209">connect</a>( cb2, SIGNAL( activated( const QString & ) ), this, SLOT( <a href=#379>slotCombo2Activated</a>( const QString & ) ) );
}
/*
* SLOT slotLeft2Right
*
* Copies all selected items of the first ListBox into the
* second ListBox
*/
void <a name="377"></a>ListBoxCombo::slotLeft2Right()
{
// Go through all items of the first ListBox
for ( unsigned int i = 0; i < lb1->count(); i++ ) {
<a href="qlistboxitem.html">QListBoxItem</a> *item = lb1->item( i );
// if the item is selected...
if ( item-><a href="qlistboxitem.html#648c07">selected</a>() ) {
// ...and it is a text item...
if ( item-><a href="qlistboxitem.html#ece6c3">pixmap</a>() && !item-><a href="qlistboxitem.html#56f62d">text</a>().isEmpty() )
lb2->insertItem( *item-><a href="qlistboxitem.html#ece6c3">pixmap</a>(), item-><a href="qlistboxitem.html#56f62d">text</a>() );
else if ( !item-><a href="qlistboxitem.html#ece6c3">pixmap</a>() )
lb2->insertItem( item-><a href="qlistboxitem.html#56f62d">text</a>() );
else if ( item-><a href="qlistboxitem.html#56f62d">text</a>().isEmpty() )
lb2->insertItem( *item-><a href="qlistboxitem.html#ece6c3">pixmap</a>() );
}
}
}
/*
* SLOT slotCombo1Activated( const QString &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="378"></a>ListBoxCombo::slotCombo1Activated( const QString &s )
{
label1->setText( <a href="qstring.html">QString</a>( "Current Item: %1" ).arg( s ) );
}
/*
* SLOT slotCombo2Activated( const QString &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="379"></a>ListBoxCombo::slotCombo2Activated( const QString &s )
{
label2->setText( <a href="qstring.html">QString</a>( "Current Item: %1" ).arg( s ) );
}
</pre>
<hr>
Main:
<pre>/****************************************************************************
** $Id: qt/examples/listboxcombo/main.cpp 2.3.1 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.
**
*****************************************************************************/
#include "listboxcombo.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 );
ListBoxCombo listboxcombo;
listboxcombo.<a name="resize"></a><a href="qwidget.html#9ff9d8">resize</a>( 400, 270 );
listboxcombo.<a name="setCaption"></a><a href="qwidget.html#d4f007">setCaption</a>( "Examples for Listboxes and Comboboxes" );
a.<a name="setMainWidget"></a><a href="qapplication.html#11c921">setMainWidget</a>( &listboxcombo );
listboxcombo.<a name="show"></a><a href="qwidget.html#ccc8f7">show</a>();
return a.<a name="exec"></a><a href="qapplication.html#7076af">exec</a>();
}
</pre>
<p><address><hr><div align="center">
<table width="100%" cellspacing="0" border="0"><tr>
<td>Copyright 2000 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.1</div>
</table></div></address></body></html>
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