<!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 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Listbox Example</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <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="qwidget-h.html">ntqwidget.h</a>> 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 <<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="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-><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="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-><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="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-><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="ntqobject.html#connect">connect</a>( b, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, 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="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-><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="ntqwidget.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="ntqobject.html#connect">connect</a>( b, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, 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="ntqobject.html#connect">connect</a>( cb, SIGNAL(<a href="ntqbutton.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="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-><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-><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-><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-><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="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-><a href="ntqwidget.html#setEnabled">setEnabled</a>( FALSE ); rows-><a href="ntqwidget.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="ntqwidget.html#setEnabled">setEnabled</a>( TRUE ); rows-><a href="ntqwidget.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="ntqwidget.html#setEnabled">setEnabled</a>( FALSE ); rows-><a href="ntqwidget.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="ntqwidget.html#setEnabled">setEnabled</a>( FALSE ); rows-><a href="ntqwidget.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="ntqwidget.html#setCaption">setCaption</a>( "TQt Example - Listbox" ); a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &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>. <!-- eof --> <p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <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> </table></div></address></body> </html>