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310 lines
13 KiB
310 lines
13 KiB
14 years ago
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<!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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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Listboxes and Comboboxes</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Annotated</font></a>
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<font color="#004faf">Grouped Classes</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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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 Qt. 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">qvbox.h</a>>
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class QListBox;
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class QLabel;
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class ListBoxCombo : public <a href="qvbox.html">QVBox</a>
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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public:
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ListBoxCombo( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
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protected:
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<a href="qlistbox.html">QListBox</a> *lb1, *lb2;
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<a href="qlabel.html">QLabel</a> *label1, *label2;
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protected slots:
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void slotLeft2Right();
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void slotCombo1Activated( const <a href="qstring.html">QString</a> &s );
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void slotCombo2Activated( const <a href="qstring.html">QString</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 Qt. 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">qcombobox.h</a>>
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#include <<a href="qlistbox-h.html">qlistbox.h</a>>
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#include <<a href="qhbox-h.html">qhbox.h</a>>
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#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
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#include <<a href="qstring-h.html">qstring.h</a>>
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#include <<a href="qpixmap-h.html">qpixmap.h</a>>
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#include <<a href="qlabel-h.html">qlabel.h</a>>
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#include <<a href="qimage-h.html">qimage.h</a>>
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#include <<a href="qpainter-h.html">qpainter.h</a>>
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#include <<a href="qstyle-h.html">qstyle.h</a>>
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class MyListBoxItem : public <a href="qlistboxitem.html">QListBoxItem</a>
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{
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public:
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MyListBoxItem()
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: <a href="qlistboxitem.html">QListBoxItem</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="qpainter.html">QPainter</a> * );
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virtual int width( const <a href="qlistbox.html">QListBox</a>* ) const { return 100; }
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virtual int height( const <a href="qlistbox.html">QListBox</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="qpainter.html">QPainter</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="qpainter.html#device">device</a>();
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<a href="qrect.html">QRect</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="qpainter.html#eraseRect">eraseRect</a>( r );
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<a name="x1415"></a> painter-><a href="qpainter.html#fillRect">fillRect</a>( 5, 5, width( listBox() ) - 10, height( listBox() ) - 10, Qt::red );
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if ( in_list_box && isCurrent() )
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listBox()->style().drawPrimitive( QStyle::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="qwidget.html">QWidget</a> *parent, const char *name )
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: <a href="qvbox.html">QVBox</a>( parent, name )
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{
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<a href="qframe.html#setMargin">setMargin</a>( 5 );
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<a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
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unsigned int i;
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<a href="qstring.html">QString</a> str;
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<a href="qhbox.html">QHBox</a> *row1 = new <a href="qhbox.html">QHBox</a>( this );
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<a name="x1402"></a> row1-><a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
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// Create a multi-selection ListBox...
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lb1 = new <a href="qlistbox.html">QListBox</a>( row1 );
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<a name="x1408"></a> lb1-><a href="qlistbox.html#setSelectionMode">setSelectionMode</a>( QListBox::Multi );
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// ...insert a pixmap item...
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<a name="x1406"></a> lb1-><a href="qlistbox.html#insertItem">insertItem</a>( QPixmap( "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 = QString( "Listbox Item %1" ).arg( i );
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if ( !( i % 4 ) )
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lb1-><a href="qlistbox.html#insertItem">insertItem</a>( QPixmap( "fileopen.xpm" ), str );
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else
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lb1-><a href="qlistbox.html#insertItem">insertItem</a>( str );
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}
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// Create a pushbutton...
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<a href="qpushbutton.html">QPushButton</a> *arrow1 = new <a href="qpushbutton.html">QPushButton</a>( " -> ", row1 );
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// ...and connect the clicked SIGNAL with the SLOT slotLeft2Right
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<a href="qobject.html#connect">connect</a>( arrow1, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( slotLeft2Right() ) );
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// create an empty single-selection ListBox
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lb2 = new <a href="qlistbox.html">QListBox</a>( row1 );
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<a href="qhbox.html">QHBox</a> *row2 = new <a href="qhbox.html">QHBox</a>( this );
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row2-><a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
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<a href="qvbox.html">QVBox</a> *box1 = new <a href="qvbox.html">QVBox</a>( row2 );
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box1-><a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
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// Create a non-editable Combobox and a label below...
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<a href="qcombobox.html">QComboBox</a> *cb1 = new <a href="qcombobox.html">QComboBox</a>( FALSE, box1 );
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label1 = new <a href="qlabel.html">QLabel</a>( "Current Item: Combobox Item 0", box1 );
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<a name="x1416"></a><a name="x1404"></a> label1-><a href="qwidget.html#setMaximumHeight">setMaximumHeight</a>( label1-><a href="qwidget.html#sizeHint">sizeHint</a>().height() * 2 );
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<a name="x1401"></a> label1-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::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 = QString( "Combobox Item %1" ).arg( i );
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if ( i % 9 )
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<a name="x1399"></a> cb1-><a href="qcombobox.html#insertItem">insertItem</a>( str );
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else
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<a name="x1400"></a> cb1-><a href="qcombobox.html#listBox">listBox</a>()->insertItem( new MyListBoxItem );
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}
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<a href="qvbox.html">QVBox</a> *box2 = new <a href="qvbox.html">QVBox</a>( row2 );
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box2-><a href="qhbox.html#setSpacing">setSpacing</a>( 5 );
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// Create an editable Combobox and a label below...
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<a href="qcombobox.html">QComboBox</a> *cb2 = new <a href="qcombobox.html">QComboBox</a>( TRUE, box2 );
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label2 = new <a href="qlabel.html">QLabel</a>( "Current Item: Combobox Item 0", box2 );
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label2-><a href="qwidget.html#setMaximumHeight">setMaximumHeight</a>( label2-><a href="qwidget.html#sizeHint">sizeHint</a>().height() * 2 );
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label2-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::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 = QString( "Combobox Item %1" ).arg( i );
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if ( !( i % 4 ) )
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cb2-><a href="qcombobox.html#insertItem">insertItem</a>( QPixmap( "fileopen.xpm" ), str );
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else
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cb2-><a href="qcombobox.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="qobject.html#connect">connect</a>( cb1, SIGNAL( <a href="qcombobox.html#activated">activated</a>( const <a href="qstring.html">QString</a> & ) ), this, SLOT( slotCombo1Activated( const <a href="qstring.html">QString</a> & ) ) );
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<a href="qobject.html#connect">connect</a>( cb2, SIGNAL( <a href="qcombobox.html#activated">activated</a>( const <a href="qstring.html">QString</a> & ) ), this, SLOT( slotCombo2Activated( const <a href="qstring.html">QString</a> & ) ) );
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}
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/*
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* 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="qlistbox.html#count">count</a>(); i++ ) {
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<a name="x1407"></a> <a href="qlistboxitem.html">QListBoxItem</a> *item = lb1-><a href="qlistbox.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="qlistbox.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="qlistbox.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="qlistbox.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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* SLOT slotCombo1Activated( const <a href="qstring.html">QString</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="qstring.html">QString</a> &s )
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{
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<a name="x1403"></a> label1-><a href="qlabel.html#setText">setText</a>( QString( "Current Item: %1" ).arg( s ) );
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}
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/*
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* SLOT slotCombo2Activated( const <a href="qstring.html">QString</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="qstring.html">QString</a> &s )
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{
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label2-><a href="qlabel.html#setText">setText</a>( QString( "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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||
|
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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.
|
||
|
|
**
|
||
|
|
** This file is part of an example program for Qt. This example
|
||
|
|
** program may be used, distributed and modified without limitation.
|
||
|
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**
|
||
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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">qapplication.h</a>>
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int main( int argc, char **argv )
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{
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<a href="qapplication.html">QApplication</a> a( argc, argv );
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ListBoxCombo listboxcombo;
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listboxcombo.<a href="qwidget.html#resize">resize</a>( 400, 270 );
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listboxcombo.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - Listboxes and Comboboxes" );
|
||
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|
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &listboxcombo );
|
||
|
|
listboxcombo.<a href="qwidget.html#show">show</a>();
|
||
|
|
|
||
|
|
return a.<a href="qapplication.html#exec">exec</a>();
|
||
|
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}
|
||
|
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</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>Qt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
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