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310 lines
14 KiB
310 lines
14 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/listboxcombo/listboxcombo.doc:4 -->
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<title>Listboxes and Comboboxes</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>Listboxes and Comboboxes</h1>
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<p>
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This example program demonstrates how to use listboxes (with single selection
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and multi selection) and comboboxes (editable and non-editable).
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<p> <hr>
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<p> Header file:
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<p> <pre>/****************************************************************************
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** $Id: qt/listboxcombo.h 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#ifndef LISTBOX_COMBO_H
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#define LISTBOX_COMBO_H
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#include <<a href="qvbox-h.html">ntqvbox.h</a>>
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class TQListBox;
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class TQLabel;
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class ListBoxCombo : public <a href="ntqvbox.html">TQVBox</a>
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{
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<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
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public:
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ListBoxCombo( <a href="tqwidget.html">TQWidget</a> *parent = 0, const char *name = 0 );
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protected:
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<a href="ntqlistbox.html">TQListBox</a> *lb1, *lb2;
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<a href="ntqlabel.html">TQLabel</a> *label1, *label2;
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protected slots:
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void slotLeft2Right();
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void slotCombo1Activated( const <a href="tqstring.html">TQString</a> &s );
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void slotCombo2Activated( const <a href="tqstring.html">TQString</a> &s );
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};
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#endif
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</pre>
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/listboxcombo.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "listboxcombo.h"
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#include <<a href="qcombobox-h.html">ntqcombobox.h</a>>
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#include <<a href="qlistbox-h.html">ntqlistbox.h</a>>
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#include <<a href="qhbox-h.html">ntqhbox.h</a>>
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#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
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#include <<a href="tqstring-h.html">tqstring.h</a>>
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#include <<a href="qpixmap-h.html">ntqpixmap.h</a>>
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#include <<a href="qlabel-h.html">ntqlabel.h</a>>
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#include <<a href="tqimage-h.html">tqimage.h</a>>
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#include <<a href="tqpainter-h.html">tqpainter.h</a>>
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#include <<a href="tqstyle-h.html">tqstyle.h</a>>
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class MyListBoxItem : public <a href="qlistboxitem.html">TQListBoxItem</a>
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{
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public:
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MyListBoxItem()
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: <a href="qlistboxitem.html">TQListBoxItem</a>()
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{
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setCustomHighlighting( TRUE );
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}
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protected:
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virtual void paint( <a href="tqpainter.html">TQPainter</a> * );
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virtual int width( const <a href="ntqlistbox.html">TQListBox</a>* ) const { return 100; }
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virtual int height( const <a href="ntqlistbox.html">TQListBox</a>* ) const { return 16; }
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};
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<a name="x1410"></a>void MyListBoxItem::<a href="qlistboxitem.html#paint">paint</a>( <a href="tqpainter.html">TQPainter</a> *painter )
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{
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// evil trick: find out whether we are painted onto our listbox
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<a name="x1413"></a> bool in_list_box = <a href="qlistboxitem.html#listBox">listBox</a>() && listBox()->viewport() == painter-><a href="tqpainter.html#device">device</a>();
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<a href="ntqrect.html">TQRect</a> r ( 0, 0, width( <a href="qlistboxitem.html#listBox">listBox</a>() ), height( <a href="qlistboxitem.html#listBox">listBox</a>() ) );
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if ( in_list_box && isSelected() )
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<a name="x1414"></a> painter-><a href="tqpainter.html#eraseRect">eraseRect</a>( r );
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<a name="x1415"></a> painter-><a href="tqpainter.html#fillRect">fillRect</a>( 5, 5, width( listBox() ) - 10, height( listBox() ) - 10, TQt::red );
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if ( in_list_box && isCurrent() )
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listBox()->style().drawPrimitive( TQStyle::PE_FocusRect, painter, r, listBox()->colorGroup() );
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}
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/*
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* Constructor
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*
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* Creates child widgets of the ListBoxCombo widget
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*/
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<a name="f437"></a>ListBoxCombo::ListBoxCombo( <a href="tqwidget.html">TQWidget</a> *parent, const char *name )
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: <a href="ntqvbox.html">TQVBox</a>( parent, name )
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{
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<a href="ntqframe.html#setMargin">setMargin</a>( 5 );
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<a href="ntqhbox.html#setSpacing">setSpacing</a>( 5 );
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unsigned int i;
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<a href="tqstring.html">TQString</a> str;
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<a href="ntqhbox.html">TQHBox</a> *row1 = new <a href="ntqhbox.html">TQHBox</a>( this );
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<a name="x1402"></a> row1-><a href="ntqhbox.html#setSpacing">setSpacing</a>( 5 );
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// Create a multi-selection ListBox...
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lb1 = new <a href="ntqlistbox.html">TQListBox</a>( row1 );
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<a name="x1408"></a> lb1-><a href="ntqlistbox.html#setSelectionMode">setSelectionMode</a>( TQListBox::Multi );
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// ...insert a pixmap item...
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<a name="x1406"></a> lb1-><a href="ntqlistbox.html#insertItem">insertItem</a>( TQPixmap( "qtlogo.png" ) );
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// ...and 100 text items
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for ( i = 0; i < 100; i++ ) {
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str = TQString( "Listbox Item %1" ).arg( i );
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if ( !( i % 4 ) )
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lb1-><a href="ntqlistbox.html#insertItem">insertItem</a>( TQPixmap( "fileopen.xpm" ), str );
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else
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lb1-><a href="ntqlistbox.html#insertItem">insertItem</a>( str );
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}
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// Create a pushbutton...
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<a href="ntqpushbutton.html">TQPushButton</a> *arrow1 = new <a href="ntqpushbutton.html">TQPushButton</a>( " -> ", row1 );
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// ...and connect the clicked TQ_SIGNAL with the TQ_SLOT slotLeft2Right
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<a href="tqobject.html#connect">connect</a>( arrow1, TQ_SIGNAL( <a href="ntqbutton.html#clicked">clicked</a>() ), this, TQ_SLOT( slotLeft2Right() ) );
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// create an empty single-selection ListBox
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lb2 = new <a href="ntqlistbox.html">TQListBox</a>( row1 );
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<a href="ntqhbox.html">TQHBox</a> *row2 = new <a href="ntqhbox.html">TQHBox</a>( this );
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row2-><a href="ntqhbox.html#setSpacing">setSpacing</a>( 5 );
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<a href="ntqvbox.html">TQVBox</a> *box1 = new <a href="ntqvbox.html">TQVBox</a>( row2 );
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box1-><a href="ntqhbox.html#setSpacing">setSpacing</a>( 5 );
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// Create a non-editable Combobox and a label below...
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<a href="ntqcombobox.html">TQComboBox</a> *cb1 = new <a href="ntqcombobox.html">TQComboBox</a>( FALSE, box1 );
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label1 = new <a href="ntqlabel.html">TQLabel</a>( "Current Item: Combobox Item 0", box1 );
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<a name="x1416"></a><a name="x1404"></a> label1-><a href="tqwidget.html#setMaximumHeight">setMaximumHeight</a>( label1-><a href="tqwidget.html#sizeHint">sizeHint</a>().height() * 2 );
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<a name="x1401"></a> label1-><a href="ntqframe.html#setFrameStyle">setFrameStyle</a>( TQFrame::Panel | TQFrame::Sunken );
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//...and insert 50 items into the Combobox
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for ( i = 0; i < 50; i++ ) {
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str = TQString( "Combobox Item %1" ).arg( i );
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if ( i % 9 )
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<a name="x1399"></a> cb1-><a href="ntqcombobox.html#insertItem">insertItem</a>( str );
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else
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<a name="x1400"></a> cb1-><a href="ntqcombobox.html#listBox">listBox</a>()->insertItem( new MyListBoxItem );
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}
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<a href="ntqvbox.html">TQVBox</a> *box2 = new <a href="ntqvbox.html">TQVBox</a>( row2 );
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box2-><a href="ntqhbox.html#setSpacing">setSpacing</a>( 5 );
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// Create an editable Combobox and a label below...
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<a href="ntqcombobox.html">TQComboBox</a> *cb2 = new <a href="ntqcombobox.html">TQComboBox</a>( TRUE, box2 );
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label2 = new <a href="ntqlabel.html">TQLabel</a>( "Current Item: Combobox Item 0", box2 );
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label2-><a href="tqwidget.html#setMaximumHeight">setMaximumHeight</a>( label2-><a href="tqwidget.html#sizeHint">sizeHint</a>().height() * 2 );
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label2-><a href="ntqframe.html#setFrameStyle">setFrameStyle</a>( TQFrame::Panel | TQFrame::Sunken );
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// ... and insert 50 items into the Combobox
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for ( i = 0; i < 50; i++ ) {
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str = TQString( "Combobox Item %1" ).arg( i );
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if ( !( i % 4 ) )
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cb2-><a href="ntqcombobox.html#insertItem">insertItem</a>( TQPixmap( "fileopen.xpm" ), str );
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else
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cb2-><a href="ntqcombobox.html#insertItem">insertItem</a>( str );
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}
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// Connect the activated SIGNALs of the Comboboxes with SLOTs
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<a name="x1398"></a> <a href="tqobject.html#connect">connect</a>( cb1, TQ_SIGNAL( <a href="ntqcombobox.html#activated">activated</a>( const <a href="tqstring.html">TQString</a> & ) ), this, TQ_SLOT( slotCombo1Activated( const <a href="tqstring.html">TQString</a> & ) ) );
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<a href="tqobject.html#connect">connect</a>( cb2, TQ_SIGNAL( <a href="ntqcombobox.html#activated">activated</a>( const <a href="tqstring.html">TQString</a> & ) ), this, TQ_SLOT( slotCombo2Activated( const <a href="tqstring.html">TQString</a> & ) ) );
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}
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/*
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* TQ_SLOT slotLeft2Right
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*
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* Copies all selected items of the first ListBox into the
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* second ListBox
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*/
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void <a name="f438"></a>ListBoxCombo::slotLeft2Right()
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{
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// Go through all items of the first ListBox
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<a name="x1405"></a> for ( unsigned int i = 0; i < lb1-><a href="ntqlistbox.html#count">count</a>(); i++ ) {
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<a name="x1407"></a> <a href="qlistboxitem.html">TQListBoxItem</a> *item = lb1-><a href="ntqlistbox.html#item">item</a>( i );
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// if the item is selected...
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<a name="x1409"></a> if ( item-><a href="qlistboxitem.html#isSelected">isSelected</a>() ) {
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// ...and it is a text item...
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<a name="x1412"></a><a name="x1411"></a> if ( item-><a href="qlistboxitem.html#pixmap">pixmap</a>() && !item-><a href="qlistboxitem.html#text">text</a>().isEmpty() )
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lb2-><a href="ntqlistbox.html#insertItem">insertItem</a>( *item-><a href="qlistboxitem.html#pixmap">pixmap</a>(), item-><a href="qlistboxitem.html#text">text</a>() );
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else if ( !item-><a href="qlistboxitem.html#pixmap">pixmap</a>() )
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lb2-><a href="ntqlistbox.html#insertItem">insertItem</a>( item-><a href="qlistboxitem.html#text">text</a>() );
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else if ( item-><a href="qlistboxitem.html#text">text</a>().isEmpty() )
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lb2-><a href="ntqlistbox.html#insertItem">insertItem</a>( *item-><a href="qlistboxitem.html#pixmap">pixmap</a>() );
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}
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}
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}
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/*
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* TQ_SLOT slotCombo1Activated( const <a href="tqstring.html">TQString</a> &s )
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*
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* Sets the text of the item which the user just selected
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* in the first Combobox (and is now the value of s) to
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* the first Label.
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*/
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void <a name="f439"></a>ListBoxCombo::slotCombo1Activated( const <a href="tqstring.html">TQString</a> &s )
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{
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<a name="x1403"></a> label1-><a href="ntqlabel.html#setText">setText</a>( TQString( "Current Item: %1" ).arg( s ) );
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}
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/*
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* TQ_SLOT slotCombo2Activated( const <a href="tqstring.html">TQString</a> &s )
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*
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* Sets the text of the item which the user just selected
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* in the second Combobox (and is now the value of s) to
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* the second Label.
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*/
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void <a name="f440"></a>ListBoxCombo::slotCombo2Activated( const <a href="tqstring.html">TQString</a> &s )
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{
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label2-><a href="ntqlabel.html#setText">setText</a>( TQString( "Current Item: %1" ).arg( s ) );
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}
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</pre>
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<p> <hr>
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<p> Main:
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<p> <pre>/****************************************************************************
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** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "listboxcombo.h"
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#include <<a href="qapplication-h.html">ntqapplication.h</a>>
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int main( int argc, char **argv )
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{
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<a href="ntqapplication.html">TQApplication</a> a( argc, argv );
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ListBoxCombo listboxcombo;
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listboxcombo.<a href="tqwidget.html#resize">resize</a>( 400, 270 );
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listboxcombo.<a href="tqwidget.html#setCaption">setCaption</a>( "TQt Example - Listboxes and Comboboxes" );
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a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &listboxcombo );
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listboxcombo.<a href="tqwidget.html#show">show</a>();
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return a.<a href="ntqapplication.html#exec">exec</a>();
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}
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</pre>
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<p>See also <a href="examples.html">Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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