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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="ntqlistbox.html">TQListBox</a>.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/listbox.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 LISTBOX_H
#define LISTBOX_H


class TQSpinBox;
class TQListBox;
class TQButtonGroup;

#include &lt;<a href="qwidget-h.html">ntqwidget.h</a>&gt;


class ListBoxDemo: public <a href="ntqwidget.html">TQWidget</a>
{
    <a href="metaobjects.html#TQ_OBJECT">TQ_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="ntqlistbox.html">TQListBox</a> * l;
    <a href="ntqspinbox.html">TQSpinBox</a> * columns;
    <a href="ntqspinbox.html">TQSpinBox</a> * rows;
    <a href="ntqbuttongroup.html">TQButtonGroup</a> * bg;
};


#endif
</pre>

<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/listbox.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 "listbox.h"

#include &lt;<a href="qlabel-h.html">ntqlabel.h</a>&gt;
#include &lt;<a href="qradiobutton-h.html">ntqradiobutton.h</a>&gt;
#include &lt;<a href="qcheckbox-h.html">ntqcheckbox.h</a>&gt;
#include &lt;<a href="qspinbox-h.html">ntqspinbox.h</a>&gt;
#include &lt;<a href="qlistbox-h.html">ntqlistbox.h</a>&gt;
#include &lt;<a href="qbuttongroup-h.html">ntqbuttongroup.h</a>&gt;
#include &lt;<a href="qlayout-h.html">ntqlayout.h</a>&gt;
#include &lt;<a href="qpushbutton-h.html">ntqpushbutton.h</a>&gt;


<a name="f441"></a>ListBoxDemo::ListBoxDemo()
    : <a href="ntqwidget.html">TQWidget</a>( 0, 0 )
{
    <a href="qgridlayout.html">TQGridLayout</a> * g = new <a href="qgridlayout.html">TQGridLayout</a>( this, 2, 2, 6 );

    g-&gt;<a href="qgridlayout.html#addWidget">addWidget</a>( new <a href="ntqlabel.html">TQLabel</a>( "&lt;b&gt;Configuration:&lt;/b&gt;", this ), 0, 0 );
    g-&gt;<a href="qgridlayout.html#addWidget">addWidget</a>( new <a href="ntqlabel.html">TQLabel</a>( "&lt;b&gt;Result:&lt;/b&gt;", this ), 0, 1 );

    l = new <a href="ntqlistbox.html">TQListBox</a>( this );
    g-&gt;<a href="qgridlayout.html#addWidget">addWidget</a>( l, 1, 1 );
<a name="x1447"></a>    l-&gt;<a href="ntqwidget.html#setFocusPolicy">setFocusPolicy</a>( TQWidget::StrongFocus );

    <a href="qvboxlayout.html">TQVBoxLayout</a> * v = new <a href="qvboxlayout.html">TQVBoxLayout</a>;
<a name="x1430"></a>    g-&gt;<a href="qgridlayout.html#addLayout">addLayout</a>( v, 1, 0 );

    <a href="ntqradiobutton.html">TQRadioButton</a> * b;
    bg = new <a href="ntqbuttongroup.html">TQButtonGroup</a>( 0 );

    b = new <a href="ntqradiobutton.html">TQRadioButton</a>( "Fixed number of columns,\n"
                          "as many rows as needed.",
                          this );
<a name="x1428"></a>    bg-&gt;<a href="ntqbuttongroup.html#insert">insert</a>( b );
<a name="x1425"></a>    v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( b );
<a name="x1440"></a>    b-&gt;<a href="ntqradiobutton.html#setChecked">setChecked</a>( TRUE );
<a name="x1426"></a>    <a href="ntqobject.html#connect">connect</a>( b, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, SLOT(setNumCols()) );
    <a href="qhboxlayout.html">TQHBoxLayout</a> * h = new <a href="qhboxlayout.html">TQHBoxLayout</a>;
<a name="x1422"></a>    v-&gt;<a href="qboxlayout.html#addLayout">addLayout</a>( h );
<a name="x1423"></a>    h-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 30 );
    h-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 100 );
    h-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="ntqlabel.html">TQLabel</a>( "Columns:", this ) );
    columns = new <a href="ntqspinbox.html">TQSpinBox</a>( this );
    h-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( columns );

    v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );

    b = new <a href="ntqradiobutton.html">TQRadioButton</a>( "As many columns as fit on-screen,\n"
                          "as many rows as needed.",
                          this );
    bg-&gt;<a href="ntqbuttongroup.html#insert">insert</a>( b );
    v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( b );
    <a href="ntqobject.html#connect">connect</a>( b, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, SLOT(setColsByWidth()) );

    v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );

    b = new <a href="ntqradiobutton.html">TQRadioButton</a>( "Fixed number of rows,\n"
                          "as many columns as needed.",
                          this );
    bg-&gt;<a href="ntqbuttongroup.html#insert">insert</a>( b );
    v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( b );
    <a href="ntqobject.html#connect">connect</a>( b, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, SLOT(setNumRows()) );
    h = new <a href="qhboxlayout.html">TQHBoxLayout</a>;
    v-&gt;<a href="qboxlayout.html#addLayout">addLayout</a>( h );
    h-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 30 );
    h-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 100 );
    h-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="ntqlabel.html">TQLabel</a>( "Rows:", this ) );
    rows = new <a href="ntqspinbox.html">TQSpinBox</a>( this );
<a name="x1442"></a>    rows-&gt;<a href="ntqwidget.html#setEnabled">setEnabled</a>( FALSE );
    h-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( rows );

    v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );

    b = new <a href="ntqradiobutton.html">TQRadioButton</a>( "As many rows as fit on-screen,\n"
                          "as many columns as needed.",
                          this );
    bg-&gt;<a href="ntqbuttongroup.html#insert">insert</a>( b );
    v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( b );
    <a href="ntqobject.html#connect">connect</a>( b, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, SLOT(setRowsByHeight()) );

    v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 12 );

    <a href="ntqcheckbox.html">TQCheckBox</a> * cb = new <a href="ntqcheckbox.html">TQCheckBox</a>( "Variable-height rows", this );
<a name="x1429"></a>    cb-&gt;<a href="ntqcheckbox.html#setChecked">setChecked</a>( TRUE );
<a name="x1427"></a>    <a href="ntqobject.html#connect">connect</a>( cb, SIGNAL(<a href="ntqbutton.html#toggled">toggled</a>(bool)), this, SLOT(setVariableHeight(bool)) );
    v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( cb );
    v-&gt;<a href="qboxlayout.html#addSpacing">addSpacing</a>( 6 );

    cb = new <a href="ntqcheckbox.html">TQCheckBox</a>( "Variable-width columns", this );
    <a href="ntqobject.html#connect">connect</a>( cb, SIGNAL(<a href="ntqbutton.html#toggled">toggled</a>(bool)), this, SLOT(setVariableWidth(bool)) );
    v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( cb );

    cb = new <a href="ntqcheckbox.html">TQCheckBox</a>( "Extended-Selection", this );
    <a href="ntqobject.html#connect">connect</a>( cb, SIGNAL(<a href="ntqbutton.html#toggled">toggled</a>(bool)), this, SLOT(setMultiSelection(bool)) );
    v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( cb );

    <a href="ntqpushbutton.html">TQPushButton</a> *pb = new <a href="ntqpushbutton.html">TQPushButton</a>( "Sort ascending", this );
    <a href="ntqobject.html#connect">connect</a>( pb, SIGNAL( <a href="ntqbutton.html#clicked">clicked</a>() ), this, SLOT( sortAscending() ) );
    v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( pb );

    pb = new <a href="ntqpushbutton.html">TQPushButton</a>( "Sort descending", this );
    <a href="ntqobject.html#connect">connect</a>( pb, SIGNAL( <a href="ntqbutton.html#clicked">clicked</a>() ), this, SLOT( sortDescending() ) );
    v-&gt;<a href="qboxlayout.html#addWidget">addWidget</a>( pb );

<a name="x1424"></a>    v-&gt;<a href="qboxlayout.html#addStretch">addStretch</a>( 100 );

    int i = 0;
    while( ++i &lt;= 2560 )
<a name="x1446"></a><a name="x1433"></a>        l-&gt;<a href="ntqlistbox.html#insertItem">insertItem</a>( TQString::<a href="ntqstring.html#fromLatin1">fromLatin1</a>( "Item " ) + TQString::number( i ),
                       i );
<a name="x1441"></a>    columns-&gt;<a href="ntqrangecontrol.html#setRange">setRange</a>( 1, 256 );
<a name="x1443"></a>    columns-&gt;<a href="ntqspinbox.html#setValue">setValue</a>( 1 );
    rows-&gt;<a href="ntqrangecontrol.html#setRange">setRange</a>( 1, 256 );
    rows-&gt;<a href="ntqspinbox.html#setValue">setValue</a>( 256 );

<a name="x1445"></a>    <a href="ntqobject.html#connect">connect</a>( columns, SIGNAL(<a href="ntqspinbox.html#valueChanged">valueChanged</a>(int)), this, SLOT(setNumCols()) );
    <a href="ntqobject.html#connect">connect</a>( rows, SIGNAL(<a href="ntqspinbox.html#valueChanged">valueChanged</a>(int)), this, SLOT(setNumRows()) );
}


ListBoxDemo::~ListBoxDemo()
{
    delete bg;
}


void <a name="f442"></a>ListBoxDemo::setNumRows()
{
    columns-&gt;<a href="ntqwidget.html#setEnabled">setEnabled</a>( FALSE );
    rows-&gt;<a href="ntqwidget.html#setEnabled">setEnabled</a>( TRUE );
<a name="x1444"></a><a name="x1435"></a>    l-&gt;<a href="ntqlistbox.html#setRowMode">setRowMode</a>( rows-&gt;<a href="ntqspinbox.html#value">value</a>() );
}


void <a name="f443"></a>ListBoxDemo::setNumCols()
{
    columns-&gt;<a href="ntqwidget.html#setEnabled">setEnabled</a>( TRUE );
    rows-&gt;<a href="ntqwidget.html#setEnabled">setEnabled</a>( FALSE );
<a name="x1434"></a>    l-&gt;<a href="ntqlistbox.html#setColumnMode">setColumnMode</a>( columns-&gt;<a href="ntqspinbox.html#value">value</a>() );
}


void <a name="f444"></a>ListBoxDemo::setRowsByHeight()
{
    columns-&gt;<a href="ntqwidget.html#setEnabled">setEnabled</a>( FALSE );
    rows-&gt;<a href="ntqwidget.html#setEnabled">setEnabled</a>( FALSE );
    l-&gt;<a href="ntqlistbox.html#setRowMode">setRowMode</a>( TQListBox::FitToHeight );
}


void <a name="f445"></a>ListBoxDemo::setColsByWidth()
{
    columns-&gt;<a href="ntqwidget.html#setEnabled">setEnabled</a>( FALSE );
    rows-&gt;<a href="ntqwidget.html#setEnabled">setEnabled</a>( FALSE );
    l-&gt;<a href="ntqlistbox.html#setColumnMode">setColumnMode</a>( TQListBox::FitToWidth );
}


void <a name="f446"></a>ListBoxDemo::setVariableWidth( bool b )
{
<a name="x1438"></a>    l-&gt;<a href="ntqlistbox.html#setVariableWidth">setVariableWidth</a>( b );
}


void <a name="f447"></a>ListBoxDemo::setVariableHeight( bool b )
{
<a name="x1437"></a>    l-&gt;<a href="ntqlistbox.html#setVariableHeight">setVariableHeight</a>( b );
}

void <a name="f448"></a>ListBoxDemo::setMultiSelection( bool b )
{
<a name="x1432"></a>    l-&gt;<a href="ntqlistbox.html#clearSelection">clearSelection</a>();
<a name="x1436"></a>    l-&gt;<a href="ntqlistbox.html#setSelectionMode">setSelectionMode</a>( b ? TQListBox::Extended : <a href="ntqlistbox.html">TQListBox</a>::Single );
}

void <a name="f449"></a>ListBoxDemo::sortAscending()
{
<a name="x1439"></a>    l-&gt;<a href="ntqlistbox.html#sort">sort</a>( TRUE );
}

void <a name="f450"></a>ListBoxDemo::sortDescending()
{
    l-&gt;<a href="ntqlistbox.html#sort">sort</a>( FALSE );
}
</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 "listbox.h"
#include &lt;<a href="qapplication-h.html">ntqapplication.h</a>&gt;

int main( int argc, char **argv )
{
    <a href="ntqapplication.html">TQApplication</a> a( argc, argv );

    ListBoxDemo t;
    t.<a href="ntqwidget.html#setCaption">setCaption</a>( "TQt Example - Listbox" );
    a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &amp;t );
    t.<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>.

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