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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/examples/checklists/checklists.doc:4 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Listviews with Checkable Items</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: #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>Listviews with Checkable Items</h1> <p> This example program shows how to use listviews with different types ofcheckable items.<p> <hr><p> Header file:<p> <pre>/****************************************************************************** $Id: qt/checklists.h 3.0.5 edited Oct 12 2001 $**** 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 CHECKLISTS_H#define CHECKLISTS_H#include <<a href="qwidget-h.html">qwidget.h</a>>class QListView;class QLabel;class CheckLists : public <a href="qwidget.html">QWidget</a>{ <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>public: CheckLists( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );protected: <a href="qlistview.html">QListView</a> *lv1, *lv2; <a href="qlabel.html">QLabel</a> *label;protected slots: void copy1to2(); void copy2to3();};#endif</pre><p> <hr><p> Implementation:<p> <pre>/****************************************************************************** $Id: qt/checklists.cpp 3.0.5 edited Oct 12 2001 $**** 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 "checklists.h"#include <<a href="qlistview-h.html">qlistview.h</a>>#include <<a href="qvbox-h.html">qvbox.h</a>>#include <<a href="qlabel-h.html">qlabel.h</a>>#include <<a href="qvaluelist-h.html">qvaluelist.h</a>>#include <<a href="qstring-h.html">qstring.h</a>>#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>#include <<a href="qlayout-h.html">qlayout.h</a>>/* * Constructor * * Create all child widgets of the CheckList Widget */<a name="f213"></a>CheckLists::CheckLists( <a href="qwidget.html">QWidget</a> *parent, const char *name ) : <a href="qwidget.html">QWidget</a>( parent, name ){ <a href="qhboxlayout.html">QHBoxLayout</a> *lay = new <a href="qhboxlayout.html">QHBoxLayout</a>( this );<a name="x424"></a> lay-><a href="qlayout.html#setMargin">setMargin</a>( 5 ); // create a widget which layouts its childs in a column <a href="qvboxlayout.html">QVBoxLayout</a> *vbox1 = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay ); vbox1-><a href="qlayout.html#setMargin">setMargin</a>( 5 ); // First child: a Label vbox1-><a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Check some items!", this ) ); // Second child: the ListView lv1 = new <a href="qlistview.html">QListView</a>( this ); vbox1-><a href="qboxlayout.html#addWidget">addWidget</a>( lv1 );<a name="x425"></a> lv1-><a href="qlistview.html#addColumn">addColumn</a>( "Items" );<a name="x427"></a> lv1-><a href="qlistview.html#setRootIsDecorated">setRootIsDecorated</a>( TRUE ); // create a list with 4 ListViewItems which will be parent items of other ListViewItems <a href="qvaluelist.html">QValueList</a><QListViewItem *> parentList;<a name="x432"></a> parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qlistviewitem.html">QListViewItem</a>( lv1, "Parent Item 1" ) ); parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qlistviewitem.html">QListViewItem</a>( lv1, "Parent Item 2" ) ); parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qlistviewitem.html">QListViewItem</a>( lv1, "Parent Item 3" ) ); parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qlistviewitem.html">QListViewItem</a>( lv1, "Parent Item 4" ) ); <a href="qlistviewitem.html">QListViewItem</a> *item = 0; unsigned int num = 1; // go through the list of parent items...<a name="x434"></a><a name="x433"></a> for ( QValueList<QListViewItem*>::Iterator it = parentList.<a href="qvaluelist.html#begin">begin</a>(); it != parentList.<a href="qvaluelist.html#end">end</a>(); ( *it )->setOpen( TRUE ), ++it, num++ ) { item = *it; // ...and create 5 checkable child ListViewItems for each parent item for ( unsigned int i = 1; i <= 5; i++ ) (void)new <a href="qchecklistitem.html">QCheckListItem</a>( item, QString( "%1. Child of Parent %2" ).arg( i ).arg( num ), QCheckListItem::CheckBox ); } // Create another widget for layouting <a href="qvboxlayout.html">QVBoxLayout</a> *tmp = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay ); tmp-><a href="qlayout.html#setMargin">setMargin</a>( 5 ); // create a pushbutton <a href="qpushbutton.html">QPushButton</a> *copy1 = new <a href="qpushbutton.html">QPushButton</a>( " -> ", this ); tmp-><a href="qboxlayout.html#addWidget">addWidget</a>( copy1 );<a name="x435"></a><a name="x431"></a> copy1-><a href="qwidget.html#setMaximumWidth">setMaximumWidth</a>( copy1-><a href="qwidget.html#sizeHint">sizeHint</a>().width() ); // connect the SIGNAL clicked() of the pushbutton with the SLOT copy1to2() <a href="qobject.html#connect">connect</a>( copy1, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( copy1to2() ) ); // another widget for layouting <a href="qvboxlayout.html">QVBoxLayout</a> *vbox2 = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay ); vbox2-><a href="qlayout.html#setMargin">setMargin</a>( 5 ); // and another label vbox2-><a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Check one item!", this ) ); // create the second listview lv2 = new <a href="qlistview.html">QListView</a>( this ); vbox2-><a href="qboxlayout.html#addWidget">addWidget</a>( lv2 ); lv2-><a href="qlistview.html#addColumn">addColumn</a>( "Items" ); lv2-><a href="qlistview.html#setRootIsDecorated">setRootIsDecorated</a>( TRUE ); // another widget needed for layouting only tmp = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay ); tmp-><a href="qlayout.html#setMargin">setMargin</a>( 5 ); // create another pushbutton... <a href="qpushbutton.html">QPushButton</a> *copy2 = new <a href="qpushbutton.html">QPushButton</a>( " -> ", this ); lay-><a href="qboxlayout.html#addWidget">addWidget</a>( copy2 ); copy2-><a href="qwidget.html#setMaximumWidth">setMaximumWidth</a>( copy2-><a href="qwidget.html#sizeHint">sizeHint</a>().width() ); // ...and connect its clicked() SIGNAL to the copy2to3() SLOT <a href="qobject.html#connect">connect</a>( copy2, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( copy2to3() ) ); tmp = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay ); tmp-><a href="qlayout.html#setMargin">setMargin</a>( 5 ); // and create a label which will be at the right of the window label = new <a href="qlabel.html">QLabel</a>( "No Item yet...", this ); tmp-><a href="qboxlayout.html#addWidget">addWidget</a>( label );}/* * SLOT copy1to2() * * Copies all checked ListViewItems from the first ListView to * the second one, and inserts them as Radio-ListViewItem. */void <a name="f214"></a>CheckLists::copy1to2(){ // create an iterator which operates on the first ListView <a href="qlistviewitemiterator.html">QListViewItemIterator</a> it( lv1 );<a name="x426"></a> lv2-><a href="qlistview.html#clear">clear</a>(); // Insert first a controller Item into the second ListView. Always if Radio-ListViewItems // are inserted into a Listview, the parent item of these MUST be a controller Item! <a href="qchecklistitem.html">QCheckListItem</a> *item = new <a href="qchecklistitem.html">QCheckListItem</a>( lv2, "Controller", QCheckListItem::Controller );<a name="x429"></a> item-><a href="qlistviewitem.html#setOpen">setOpen</a>( TRUE ); // iterate through the first ListView...<a name="x430"></a> for ( ; it.<a href="qlistviewitemiterator.html#current">current</a>(); ++it ) // ...check state of childs, and... if ( it.<a href="qlistviewitemiterator.html#current">current</a>()->parent() ) // ...if the item is checked... if ( ( (QCheckListItem*)it.<a href="qlistviewitemiterator.html#current">current</a>() )->isOn() ) // ...insert a Radio-ListViewItem with the same text into the second ListView (void)new <a href="qchecklistitem.html">QCheckListItem</a>( item, it.<a href="qlistviewitemiterator.html#current">current</a>()->text( 0 ), QCheckListItem::RadioButton );<a name="x428"></a> if ( item-><a href="qlistviewitem.html#firstChild">firstChild</a>() ) ( ( <a href="qchecklistitem.html">QCheckListItem</a>* )item-><a href="qlistviewitem.html#firstChild">firstChild</a>() )->setOn( TRUE );}/* * SLOT copy2to3() * * Copies the checked item of the second ListView into the * Label at the right. */void <a name="f215"></a>CheckLists::copy2to3(){ // create an iterator which operates on the second ListView <a href="qlistviewitemiterator.html">QListViewItemIterator</a> it( lv2 ); label-><a href="qlabel.html#setText">setText</a>( "No Item checked" ); // iterate through the second ListView... for ( ; it.<a href="qlistviewitemiterator.html#current">current</a>(); ++it ) // ...check state of childs, and... if ( it.<a href="qlistviewitemiterator.html#current">current</a>()->parent() ) // ...if the item is checked... if ( ( (QCheckListItem*)it.<a href="qlistviewitemiterator.html#current">current</a>() )->isOn() ) // ...set the text of the item to the label label-><a href="qlabel.html#setText">setText</a>( it.<a href="qlistviewitemiterator.html#current">current</a>()->text( 0 ) );}</pre><p> <hr><p> Main:<p> <pre>/****************************************************************************** $Id: qt/main.cpp 3.0.5 edited Oct 12 2001 $**** 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 "checklists.h"#include <<a href="qapplication-h.html">qapplication.h</a>>int main( int argc, char **argv ){ <a href="qapplication.html">QApplication</a> a( argc, argv ); CheckLists checklists; checklists.<a href="qwidget.html#resize">resize</a>( 650, 350 );<a name="x439"></a> checklists.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - CheckLists" ); a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &checklists ); checklists.<a href="qwidget.html#show">show</a>(); return a.<a href="qapplication.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 © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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