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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Toolkit - listboxcombo/main.cpp example file</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: white; color: black; }--></style></head><body bgcolor="#ffffff"><table width="100%"><tr><td><a href="index.html"><img width="100" height="100" src="qtlogo.png"alt="Home" border="0"><img width="100"height="100" src="face.png" alt="Home" border="0"></a><td valign="top"><div align="right"><img src="dochead.png" width="472" height="27"><br><a href="classes.html"><b>Classes</b></a>- <a href="annotated.html">Annotated</a>- <a href="hierarchy.html">Tree</a>- <a href="functions.html">Functions</a>- <a href="index.html">Home</a>- <a href="topicals.html"><b>Structure</b> <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" align="center" size=32>Qte</font></a></div></table><h1 align=center>Listboxes and Comboboxes</h1><br clear="all"> This example program demonstrates how to use Listboxes (with single selection and multi selection) and Comboboxes (editable and non-editable). <hr> Header file: <pre>/****************************************************************************** $Id: qt/examples/listboxcombo/listboxcombo.h 2.3.8 edited 2004-05-12 $**** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.**** This file is part of an example program for Qt. This example** program may be used, distributed and modified without limitation.*******************************************************************************/#ifndef LISTBOX_COMBO_H#define LISTBOX_COMBO_H#include <<a href="qvbox-h.html">qvbox.h</a>>class QListBox;class QLabel;class ListBoxCombo : public QVBox{ Q_OBJECTpublic: ListBoxCombo( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );protected: <a href="qlistbox.html">QListBox</a> *lb1, *lb2; <a href="qlabel.html">QLabel</a> *label1, *label2;protected slots: void slotLeft2Right(); void slotCombo1Activated( const QString &s ); void slotCombo2Activated( const QString &s );};#endif</pre> <hr> Implementation: <pre>/****************************************************************************** $Id: qt/examples/listboxcombo/listboxcombo.cpp 2.3.8 edited 2004-05-12 $**** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.**** This file is part of an example program for Qt. This example** program may be used, distributed and modified without limitation.*******************************************************************************/#include "listboxcombo.h"#include <<a href="qcombobox-h.html">qcombobox.h</a>>#include <<a href="qlistbox-h.html">qlistbox.h</a>>#include <<a href="qhbox-h.html">qhbox.h</a>>#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>#include <<a href="qstring-h.html">qstring.h</a>>#include <<a href="qpixmap-h.html">qpixmap.h</a>>#include <<a href="qlabel-h.html">qlabel.h</a>>#include <<a href="qimage-h.html">qimage.h</a>>class MyListBoxItem : public QListBoxItem{public: MyListBoxItem() : <a href="qlistboxitem.html">QListBoxItem</a>() { setCustomHighlighting( TRUE ); }protected: virtual void paint( <a href="qpainter.html">QPainter</a> * ); virtual int width( const QListBox* ) const { return 100; } virtual int height( const QListBox* ) const { return 16; }};void <a name="315"></a>MyListBoxItem::paint( <a href="qpainter.html">QPainter</a> *painter ){ // evil trick: find out whether we are painted onto our listbox bool in_list_box = listBox() && listBox()->viewport() == painter-><a href="qpainter.html#82920f">device</a>(); <a href="qrect.html">QRect</a> r ( 0, 0, <a href="qlistboxitem.html#483a87">width</a>( listBox() ), <a href="qlistboxitem.html#45163a">height</a>( listBox() ) ); if ( in_list_box && selected() ) painter-><a href="qpainter.html#bd5570">eraseRect</a>( r ); painter-><a href="qpainter.html#5308a7">fillRect</a>( 5, 5, <a href="qlistboxitem.html#483a87">width</a>( listBox() ) - 10, <a href="qlistboxitem.html#45163a">height</a>( listBox() ) - 10, Qt::red ); if ( in_list_box && current() ) <a href="qlistboxitem.html#6986ba">listBox</a>()->style().drawFocusRect( painter, r, <a href="qlistboxitem.html#6986ba">listBox</a>()->colorGroup(), &painter-><a href="qpainter.html#c2639b">backgroundColor</a>(), TRUE );}/* * Constructor * * Creates child widgets of the ListBoxCombo widget */ListBoxCombo::ListBoxCombo( <a href="qwidget.html">QWidget</a> *parent, const char *name ) : <a href="qvbox.html">QVBox</a>( parent, name ){ <a href="qframe.html#b11d00">setMargin</a>( 5 ); <a href="qhbox.html#0075a0">setSpacing</a>( 5 ); unsigned int i; <a href="qstring.html">QString</a> str; <a href="qhbox.html">QHBox</a> *row1 = new <a href="qhbox.html">QHBox</a>( this ); row1-><a href="qhbox.html#0075a0">setSpacing</a>( 5 ); // Create a multi-selection ListBox... lb1 = new <a href="qlistbox.html">QListBox</a>( row1 ); lb1->setSelectionMode( QListBox::Multi ); // ...insert a pixmap item... lb1->insertItem( <a href="qpixmap.html">QPixmap</a>( "qtlogo.png" ) ); // ...and 100 text items for ( i = 0; i < 100; i++ ) { str = QString( "Listbox Item %1" ).arg( i ); if ( !( i % 4 ) ) lb1->insertItem( <a href="qpixmap.html">QPixmap</a>( "fileopen.xpm" ), str ); else lb1->insertItem( str ); } // Create a pushbutton... <a href="qpushbutton.html">QPushButton</a> *arrow1 = new <a href="qpushbutton.html">QPushButton</a>( " -> ", row1 ); // ...and connect the clicked SIGNAL with the SLOT slotLeft2Right <a href="qobject.html#fbde73">connect</a>( arrow1, SIGNAL( clicked() ), this, SLOT( <a href=#312>slotLeft2Right</a>() ) ); // create an empty single-selection ListBox lb2 = new <a href="qlistbox.html">QListBox</a>( row1 ); <a href="qhbox.html">QHBox</a> *row2 = new <a href="qhbox.html">QHBox</a>( this ); row2-><a href="qhbox.html#0075a0">setSpacing</a>( 5 ); <a href="qvbox.html">QVBox</a> *box1 = new <a href="qvbox.html">QVBox</a>( row2 ); box1-><a href="qhbox.html#0075a0">setSpacing</a>( 5 ); // Create a non-editable Combobox and a label below... <a href="qcombobox.html">QComboBox</a> *cb1 = new <a href="qcombobox.html">QComboBox</a>( FALSE, box1 ); label1 = new <a href="qlabel.html">QLabel</a>( "Current Item: Combobox Item 0", box1 ); label1->setMaximumHeight( label1->sizeHint().height() * 2 ); label1->setFrameStyle( QFrame::Panel | QFrame::Sunken ); //...and insert 50 items into the Combobox for ( i = 0; i < 50; i++ ) { str = QString( "Combobox Item %1" ).arg( i ); if ( i % 9 ) cb1-><a href="qcombobox.html#613b4b">insertItem</a>( str ); else cb1-><a href="qcombobox.html#9f2e18">listBox</a>()->insertItem( new MyListBoxItem ); } <a href="qvbox.html">QVBox</a> *box2 = new <a href="qvbox.html">QVBox</a>( row2 ); box2-><a href="qhbox.html#0075a0">setSpacing</a>( 5 ); // Create an editable Combobox and a label below... <a href="qcombobox.html">QComboBox</a> *cb2 = new <a href="qcombobox.html">QComboBox</a>( TRUE, box2 ); label2 = new <a href="qlabel.html">QLabel</a>( "Current Item: Combobox Item 0", box2 ); label2->setMaximumHeight( label2->sizeHint().height() * 2 ); label2->setFrameStyle( QFrame::Panel | QFrame::Sunken ); // ... and insert 50 items into the Combobox for ( i = 0; i < 50; i++ ) { str = QString( "Combobox Item %1" ).arg( i ); if ( !( i % 4 ) ) cb2-><a href="qcombobox.html#613b4b">insertItem</a>( <a href="qpixmap.html">QPixmap</a>( "fileopen.xpm" ), str ); else cb2-><a href="qcombobox.html#613b4b">insertItem</a>( str ); } // Connect the activated SIGNALs of the Comboboxes with SLOTs <a href="qobject.html#fbde73">connect</a>( cb1, SIGNAL( activated( const QString & ) ), this, SLOT( <a href=#313>slotCombo1Activated</a>( const QString & ) ) ); <a href="qobject.html#fbde73">connect</a>( cb2, SIGNAL( activated( const QString & ) ), this, SLOT( <a href=#314>slotCombo2Activated</a>( const QString & ) ) );}/* * SLOT slotLeft2Right * * Copies all selected items of the first ListBox into the * second ListBox */void <a name="312"></a>ListBoxCombo::slotLeft2Right(){ // Go through all items of the first ListBox for ( unsigned int i = 0; i < lb1->count(); i++ ) { <a href="qlistboxitem.html">QListBoxItem</a> *item = lb1->item( i ); // if the item is selected... if ( item-><a href="qlistboxitem.html#430dc5">selected</a>() ) { // ...and it is a text item... if ( item-><a href="qlistboxitem.html#bb4260">pixmap</a>() && !item-><a href="qlistboxitem.html#abfb21">text</a>().isEmpty() ) lb2->insertItem( *item-><a href="qlistboxitem.html#bb4260">pixmap</a>(), item-><a href="qlistboxitem.html#abfb21">text</a>() ); else if ( !item-><a href="qlistboxitem.html#bb4260">pixmap</a>() ) lb2->insertItem( item-><a href="qlistboxitem.html#abfb21">text</a>() ); else if ( item-><a href="qlistboxitem.html#abfb21">text</a>().isEmpty() ) lb2->insertItem( *item-><a href="qlistboxitem.html#bb4260">pixmap</a>() ); } }}/* * SLOT slotCombo1Activated( const QString &s ) * * Sets the text of the item which the user just selected * in the first Combobox (and is now the value of s) to * the first Label. */void <a name="313"></a>ListBoxCombo::slotCombo1Activated( const QString &s ){ label1->setText( <a href="qstring.html">QString</a>( "Current Item: %1" ).arg( s ) );}/* * SLOT slotCombo2Activated( const QString &s ) * * Sets the text of the item which the user just selected * in the second Combobox (and is now the value of s) to * the second Label. */void <a name="314"></a>ListBoxCombo::slotCombo2Activated( const QString &s ){ label2->setText( <a href="qstring.html">QString</a>( "Current Item: %1" ).arg( s ) );}</pre> <hr> Main:<pre>/****************************************************************************** $Id: qt/examples/listboxcombo/main.cpp 2.3.8 edited 2004-05-12 $**** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.**** This file is part of an example program for Qt. This example** program may be used, distributed and modified without limitation.*******************************************************************************/#include "listboxcombo.h"#include <<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>int main( int argc, char **argv ){ <a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv ); ListBoxCombo listboxcombo; listboxcombo.<a name="resize"></a><a href="qwidget.html#ff9d07">resize</a>( 400, 270 ); listboxcombo.<a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>( "Qt Example - Listboxes and Comboboxes" ); a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( &listboxcombo ); listboxcombo.<a name="show"></a><a href="qwidget.html#200ee5">show</a>(); return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();}</pre><p><address><hr><div align="center"><table width="100%" cellspacing="0" border="0"><tr><td>Copyright ⌨️ 快捷键说明
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