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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/listbox/listbox.doc:4 -->
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<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="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 <<a href="tqwidget-h.html">tqwidget.h</a>>
class ListBoxDemo: public <a href="tqwidget.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 <<a href="qlabel-h.html">ntqlabel.h</a>>
#include <<a href="qradiobutton-h.html">ntqradiobutton.h</a>>
#include <<a href="qcheckbox-h.html">ntqcheckbox.h</a>>
#include <<a href="qspinbox-h.html">ntqspinbox.h</a>>
#include <<a href="qlistbox-h.html">ntqlistbox.h</a>>
#include <<a href="qbuttongroup-h.html">ntqbuttongroup.h</a>>
#include <<a href="qlayout-h.html">ntqlayout.h</a>>
#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
<a name="f441"></a>ListBoxDemo::ListBoxDemo()
: <a href="tqwidget.html">TQWidget</a>( 0, 0 )
{
<a href="qgridlayout.html">TQGridLayout</a> * g = new <a href="qgridlayout.html">TQGridLayout</a>( this, 2, 2, 6 );
g-><a href="qgridlayout.html#addWidget">addWidget</a>( new <a href="ntqlabel.html">TQLabel</a>( "<b>Configuration:</b>", this ), 0, 0 );
g-><a href="qgridlayout.html#addWidget">addWidget</a>( new <a href="ntqlabel.html">TQLabel</a>( "<b>Result:</b>", this ), 0, 1 );
l = new <a href="ntqlistbox.html">TQListBox</a>( this );
g-><a href="qgridlayout.html#addWidget">addWidget</a>( l, 1, 1 );
<a name="x1447"></a> l-><a href="tqwidget.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-><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-><a href="ntqbuttongroup.html#insert">insert</a>( b );
<a name="x1425"></a> v-><a href="qboxlayout.html#addWidget">addWidget</a>( b );
<a name="x1440"></a> b-><a href="ntqradiobutton.html#setChecked">setChecked</a>( TRUE );
<a name="x1426"></a> <a href="tqobject.html#connect">connect</a>( b, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, TQ_SLOT(setNumCols()) );
<a href="qhboxlayout.html">TQHBoxLayout</a> * h = new <a href="qhboxlayout.html">TQHBoxLayout</a>;
<a name="x1422"></a> v-><a href="qboxlayout.html#addLayout">addLayout</a>( h );
<a name="x1423"></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="ntqlabel.html">TQLabel</a>( "Columns:", this ) );
columns = new <a href="ntqspinbox.html">TQSpinBox</a>( this );
h-><a href="qboxlayout.html#addWidget">addWidget</a>( columns );
v-><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-><a href="ntqbuttongroup.html#insert">insert</a>( b );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( b );
<a href="tqobject.html#connect">connect</a>( b, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, TQ_SLOT(setColsByWidth()) );
v-><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-><a href="ntqbuttongroup.html#insert">insert</a>( b );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( b );
<a href="tqobject.html#connect">connect</a>( b, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, TQ_SLOT(setNumRows()) );
h = new <a href="qhboxlayout.html">TQHBoxLayout</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="ntqlabel.html">TQLabel</a>( "Rows:", this ) );
rows = new <a href="ntqspinbox.html">TQSpinBox</a>( this );
<a name="x1442"></a> rows-><a href="tqwidget.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="ntqradiobutton.html">TQRadioButton</a>( "As many rows as fit on-screen,\n"
"as many columns as needed.",
this );
bg-><a href="ntqbuttongroup.html#insert">insert</a>( b );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( b );
<a href="tqobject.html#connect">connect</a>( b, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, TQ_SLOT(setRowsByHeight()) );
v-><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-><a href="ntqcheckbox.html#setChecked">setChecked</a>( TRUE );
<a name="x1427"></a> <a href="tqobject.html#connect">connect</a>( cb, TQ_SIGNAL(<a href="ntqbutton.html#toggled">toggled</a>(bool)), this, TQ_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="ntqcheckbox.html">TQCheckBox</a>( "Variable-width columns", this );
<a href="tqobject.html#connect">connect</a>( cb, TQ_SIGNAL(<a href="ntqbutton.html#toggled">toggled</a>(bool)), this, TQ_SLOT(setVariableWidth(bool)) );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( cb );
cb = new <a href="ntqcheckbox.html">TQCheckBox</a>( "Extended-Selection", this );
<a href="tqobject.html#connect">connect</a>( cb, TQ_SIGNAL(<a href="ntqbutton.html#toggled">toggled</a>(bool)), this, TQ_SLOT(setMultiSelection(bool)) );
v-><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="tqobject.html#connect">connect</a>( pb, TQ_SIGNAL( <a href="ntqbutton.html#clicked">clicked</a>() ), this, TQ_SLOT( sortAscending() ) );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( pb );
pb = new <a href="ntqpushbutton.html">TQPushButton</a>( "Sort descending", this );
<a href="tqobject.html#connect">connect</a>( pb, TQ_SIGNAL( <a href="ntqbutton.html#clicked">clicked</a>() ), this, TQ_SLOT( sortDescending() ) );
v-><a href="qboxlayout.html#addWidget">addWidget</a>( pb );
<a name="x1424"></a> v-><a href="qboxlayout.html#addStretch">addStretch</a>( 100 );
int i = 0;
while( ++i <= 2560 )
<a name="x1446"></a><a name="x1433"></a> l-><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-><a href="ntqrangecontrol.html#setRange">setRange</a>( 1, 256 );
<a name="x1443"></a> columns-><a href="ntqspinbox.html#setValue">setValue</a>( 1 );
rows-><a href="ntqrangecontrol.html#setRange">setRange</a>( 1, 256 );
rows-><a href="ntqspinbox.html#setValue">setValue</a>( 256 );
<a name="x1445"></a> <a href="tqobject.html#connect">connect</a>( columns, TQ_SIGNAL(<a href="ntqspinbox.html#valueChanged">valueChanged</a>(int)), this, TQ_SLOT(setNumCols()) );
<a href="tqobject.html#connect">connect</a>( rows, TQ_SIGNAL(<a href="ntqspinbox.html#valueChanged">valueChanged</a>(int)), this, TQ_SLOT(setNumRows()) );
}
ListBoxDemo::~ListBoxDemo()
{
delete bg;
}
void <a name="f442"></a>ListBoxDemo::setNumRows()
{
columns-><a href="tqwidget.html#setEnabled">setEnabled</a>( FALSE );
rows-><a href="tqwidget.html#setEnabled">setEnabled</a>( TRUE );
<a name="x1444"></a><a name="x1435"></a> l-><a href="ntqlistbox.html#setRowMode">setRowMode</a>( rows-><a href="ntqspinbox.html#value">value</a>() );
}
void <a name="f443"></a>ListBoxDemo::setNumCols()
{
columns-><a href="tqwidget.html#setEnabled">setEnabled</a>( TRUE );
rows-><a href="tqwidget.html#setEnabled">setEnabled</a>( FALSE );
<a name="x1434"></a> l-><a href="ntqlistbox.html#setColumnMode">setColumnMode</a>( columns-><a href="ntqspinbox.html#value">value</a>() );
}
void <a name="f444"></a>ListBoxDemo::setRowsByHeight()
{
columns-><a href="tqwidget.html#setEnabled">setEnabled</a>( FALSE );
rows-><a href="tqwidget.html#setEnabled">setEnabled</a>( FALSE );
l-><a href="ntqlistbox.html#setRowMode">setRowMode</a>( TQListBox::FitToHeight );
}
void <a name="f445"></a>ListBoxDemo::setColsByWidth()
{
columns-><a href="tqwidget.html#setEnabled">setEnabled</a>( FALSE );
rows-><a href="tqwidget.html#setEnabled">setEnabled</a>( FALSE );
l-><a href="ntqlistbox.html#setColumnMode">setColumnMode</a>( TQListBox::FitToWidth );
}
void <a name="f446"></a>ListBoxDemo::setVariableWidth( bool b )
{
<a name="x1438"></a> l-><a href="ntqlistbox.html#setVariableWidth">setVariableWidth</a>( b );
}
void <a name="f447"></a>ListBoxDemo::setVariableHeight( bool b )
{
<a name="x1437"></a> l-><a href="ntqlistbox.html#setVariableHeight">setVariableHeight</a>( b );
}
void <a name="f448"></a>ListBoxDemo::setMultiSelection( bool b )
{
<a name="x1432"></a> l-><a href="ntqlistbox.html#clearSelection">clearSelection</a>();
<a name="x1436"></a> l-><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-><a href="ntqlistbox.html#sort">sort</a>( TRUE );
}
void <a name="f450"></a>ListBoxDemo::sortDescending()
{
l-><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 <<a href="qapplication-h.html">ntqapplication.h</a>>
int main( int argc, char **argv )
{
<a href="ntqapplication.html">TQApplication</a> a( argc, argv );
ListBoxDemo t;
t.<a href="tqwidget.html#setCaption">setCaption</a>( "TQt Example - Listbox" );
a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &t );
t.<a href="tqwidget.html#show">show</a>();
return a.<a href="ntqapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
<!-- eof -->
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<td>Copyright © 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>TQt 3.3.8</div>
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