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<title>Listbox Example</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>Listbox Example</h1>
<p>
This example shows how to use the different modes (single columns, multiple columns,
fixed number of rows, etc.) of <a href="qlistbox.html">QListBox</a>.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/listbox.h 3.0.2 edited Oct 12 12:18 $
**
** 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_H
#define LISTBOX_H
class QSpinBox;
class QListBox;
class QButtonGroup;
#include <<a href="qwidget-h.html">qwidget.h</a>>
class ListBoxDemo: public <a href="qwidget.html">QWidget</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
ListBoxDemo();
~ListBoxDemo();
private slots:
void setNumRows();
void setNumCols();
void setRowsByHeight();
void setColsByWidth();
void setVariableWidth( bool );
void setVariableHeight( bool );
void setMultiSelection( bool );
void sortAscending();
void sortDescending();
private:
<a href="qlistbox.html">QListBox</a> * l;
<a href="qspinbox.html">QSpinBox</a> * columns;
<a href="qspinbox.html">QSpinBox</a> * rows;
<a href="qbuttongroup.html">QButtonGroup</a> * bg;
};
#endif
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/listbox.cpp 3.0.2 edited Oct 12 12:18 $
**
** 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 "listbox.h"
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qradiobutton-h.html">qradiobutton.h</a>>
#include <<a href="qcheckbox-h.html">qcheckbox.h</a>>
#include <<a href="qspinbox-h.html">qspinbox.h</a>>
#include <<a href="qlistbox-h.html">qlistbox.h</a>>
#include <<a href="qbuttongroup-h.html">qbuttongroup.h</a>>
#include <<a href="qlayout-h.html">qlayout.h</a>>
#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
<a name="f385"></a>ListBoxDemo::ListBoxDemo()
: <a href="qwidget.html">QWidget</a>( 0, 0 )
{
<a href="qgridlayout.html">QGridLayout</a> * g = new <a href="qgridlayout.html">QGridLayout</a>( this, 2, 2, 6 );
g-><a href="qgridlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "<b>Configuration:</b>", this ), 0, 0 );
g-><a href="qgridlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "<b>Result:</b>", this ), 0, 1 );
l = new <a href="qlistbox.html">QListBox</a>( this );
g-><a href="qgridlayout.html#addWidget">addWidget</a>( l, 1, 1 );
<a name="x1288"></a> l-><a href="qwidget.html#setFocusPolicy">setFocusPolicy</a>( QWidget::StrongFocus );
<a href="qvboxlayout.html">QVBoxLayout</a> * v = new <a href="qvboxlayout.html">QVBoxLayout</a>;
<a name="x1271"></a> g-><a href="qgridlayout.html#addLayout">addLayout</a>( v, 1, 0 );
<a href="qradiobutton.html">QRadioButton</a> * b;
bg = new <a href="qbuttongroup.html">QButtonGroup</a>( 0 );
b = new <a href="qradiobutton.html">QRadioButton</a>( "Fixed number of columns,\n"
"as many rows as needed.",
this );
<a name="x1269"></a> bg-><a href="qbuttongroup.html#insert">insert</a>( b );
<a name="x1266"></a> v-><a href="qboxlayout.html#addWidget">addWidget</a>( b );
<a name="x1281"></a> b-><a href="qradiobutton.html#setChecked">setChecked</a>( TRUE );
<a name="x1267"></a> <a href="qobject.html#connect">connect</a>( b, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(setNumCols()) );
<a href="qhboxlayout.html">QHBoxLayout</a> * h = new <a href="qhboxlayout.html">QHBoxLayout</a>;
<a name="x1263"></a> v-><a href="qboxlayout.html#addLayout">addLayout</a>( h );
<a name="x1264"></a> h-><a href="qboxlayout.html#addSpacing">addSpacing</a>( 30 );
h-><a href="qboxlayout.html#addSpacing">addSpacing</a>( 100 );
h-><a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Columns:", this ) );
columns = new <a href="qspinbox.html">QSpinBox</a>( this );
h-><a href="qboxlayout.html#addWidget">addWidget</a>( columns );
v-><a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );
b = new <a href="qradiobutton.html">QRadioButton</a>( "As many columns as fit on-screen,\n"
"as many rows as needed.",
this );
bg-><a href="qbuttongroup.html#insert">insert</a>( b );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( b );
<a href="qobject.html#connect">connect</a>( b, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(setColsByWidth()) );
v-><a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );
b = new <a href="qradiobutton.html">QRadioButton</a>( "Fixed number of rows,\n"
"as many columns as needed.",
this );
bg-><a href="qbuttongroup.html#insert">insert</a>( b );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( b );
<a href="qobject.html#connect">connect</a>( b, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(setNumRows()) );
h = new <a href="qhboxlayout.html">QHBoxLayout</a>;
v-><a href="qboxlayout.html#addLayout">addLayout</a>( h );
h-><a href="qboxlayout.html#addSpacing">addSpacing</a>( 30 );
h-><a href="qboxlayout.html#addSpacing">addSpacing</a>( 100 );
h-><a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Rows:", this ) );
rows = new <a href="qspinbox.html">QSpinBox</a>( this );
<a name="x1287"></a> rows-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
h-><a href="qboxlayout.html#addWidget">addWidget</a>( rows );
v-><a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );
b = new <a href="qradiobutton.html">QRadioButton</a>( "As many rows as fit on-screen,\n"
"as many columns as needed.",
this );
bg-><a href="qbuttongroup.html#insert">insert</a>( b );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( b );
<a href="qobject.html#connect">connect</a>( b, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(setRowsByHeight()) );
v-><a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );
<a href="qcheckbox.html">QCheckBox</a> * cb = new <a href="qcheckbox.html">QCheckBox</a>( "Variable-height rows", this );
<a name="x1270"></a> cb-><a href="qcheckbox.html#setChecked">setChecked</a>( TRUE );
<a name="x1268"></a> <a href="qobject.html#connect">connect</a>( cb, SIGNAL(<a href="qbutton.html#toggled">toggled</a>(bool)), this, SLOT(setVariableHeight(bool)) );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( cb );
v-><a href="qboxlayout.html#addSpacing">addSpacing</a>( 6 );
cb = new <a href="qcheckbox.html">QCheckBox</a>( "Variable-width columns", this );
<a href="qobject.html#connect">connect</a>( cb, SIGNAL(<a href="qbutton.html#toggled">toggled</a>(bool)), this, SLOT(setVariableWidth(bool)) );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( cb );
cb = new <a href="qcheckbox.html">QCheckBox</a>( "Extended-Selection", this );
<a href="qobject.html#connect">connect</a>( cb, SIGNAL(<a href="qbutton.html#toggled">toggled</a>(bool)), this, SLOT(setMultiSelection(bool)) );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( cb );
<a href="qpushbutton.html">QPushButton</a> *pb = new <a href="qpushbutton.html">QPushButton</a>( "Sort ascending", this );
<a href="qobject.html#connect">connect</a>( pb, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( sortAscending() ) );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( pb );
pb = new <a href="qpushbutton.html">QPushButton</a>( "Sort descending", this );
<a href="qobject.html#connect">connect</a>( pb, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( sortDescending() ) );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( pb );
<a name="x1265"></a> v-><a href="qboxlayout.html#addStretch">addStretch</a>( 100 );
int i = 0;
while( ++i <= 2560 )
<a name="x1286"></a><a name="x1274"></a> l-><a href="qlistbox.html#insertItem">insertItem</a>( QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "Item " ) + QString::number( i ),
i );
<a name="x1282"></a> columns-><a href="qrangecontrol.html#setRange">setRange</a>( 1, 256 );
<a name="x1283"></a> columns-><a href="qspinbox.html#setValue">setValue</a>( 1 );
rows-><a href="qrangecontrol.html#setRange">setRange</a>( 1, 256 );
rows-><a href="qspinbox.html#setValue">setValue</a>( 256 );
<a name="x1285"></a> <a href="qobject.html#connect">connect</a>( columns, SIGNAL(<a href="qspinbox.html#valueChanged">valueChanged</a>(int)), this, SLOT(setNumCols()) );
<a href="qobject.html#connect">connect</a>( rows, SIGNAL(<a href="qspinbox.html#valueChanged">valueChanged</a>(int)), this, SLOT(setNumRows()) );
}
ListBoxDemo::~ListBoxDemo()
{
delete bg;
}
void <a name="f386"></a>ListBoxDemo::setNumRows()
{
columns-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
rows-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE );
<a name="x1284"></a><a name="x1276"></a> l-><a href="qlistbox.html#setRowMode">setRowMode</a>( rows-><a href="qspinbox.html#value">value</a>() );
}
void <a name="f387"></a>ListBoxDemo::setNumCols()
{
columns-><a href="qwidget.html#setEnabled">setEnabled</a>( TRUE );
rows-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
<a name="x1275"></a> l-><a href="qlistbox.html#setColumnMode">setColumnMode</a>( columns-><a href="qspinbox.html#value">value</a>() );
}
void <a name="f388"></a>ListBoxDemo::setRowsByHeight()
{
columns-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
rows-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
l-><a href="qlistbox.html#setRowMode">setRowMode</a>( QListBox::FitToHeight );
}
void <a name="f389"></a>ListBoxDemo::setColsByWidth()
{
columns-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
rows-><a href="qwidget.html#setEnabled">setEnabled</a>( FALSE );
l-><a href="qlistbox.html#setColumnMode">setColumnMode</a>( QListBox::FitToWidth );
}
void <a name="f390"></a>ListBoxDemo::setVariableWidth( bool b )
{
<a name="x1279"></a> l-><a href="qlistbox.html#setVariableWidth">setVariableWidth</a>( b );
}
void <a name="f391"></a>ListBoxDemo::setVariableHeight( bool b )
{
<a name="x1278"></a> l-><a href="qlistbox.html#setVariableHeight">setVariableHeight</a>( b );
}
void <a name="f392"></a>ListBoxDemo::setMultiSelection( bool b )
{
<a name="x1273"></a> l-><a href="qlistbox.html#clearSelection">clearSelection</a>();
<a name="x1277"></a> l-><a href="qlistbox.html#setSelectionMode">setSelectionMode</a>( b ? QListBox::Extended : <a href="qlistbox.html">QListBox</a>::Single );
}
void <a name="f393"></a>ListBoxDemo::sortAscending()
{
<a name="x1280"></a> l-><a href="qlistbox.html#sort">sort</a>( TRUE );
}
void <a name="f394"></a>ListBoxDemo::sortDescending()
{
l-><a href="qlistbox.html#sort">sort</a>( FALSE );
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.0.2 edited Oct 12 12:18 $
**
** 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 "listbox.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 );
ListBoxDemo t;
t.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Listbox" );
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &t );
t.<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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