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284 lines
13 KiB
284 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/checklists/checklists.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>Listviews with Checkable Items</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: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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<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">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>Listviews with Checkable Items</h1>
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<p>
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This example program shows how to use listviews with different types of
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checkable items.
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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/checklists.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 CHECKLISTS_H
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#define CHECKLISTS_H
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#include <<a href="qwidget-h.html">qwidget.h</a>>
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class QListView;
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class QLabel;
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class CheckLists : public <a href="qwidget.html">QWidget</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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CheckLists( <a href="qwidget.html">QWidget</a> *parent = 0, const char *name = 0 );
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protected:
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<a href="qlistview.html">QListView</a> *lv1, *lv2;
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<a href="qlabel.html">QLabel</a> *label;
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protected slots:
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void copy1to2();
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void copy2to3();
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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/checklists.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 "checklists.h"
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#include <<a href="qlistview-h.html">qlistview.h</a>>
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#include <<a href="qvbox-h.html">qvbox.h</a>>
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#include <<a href="qlabel-h.html">qlabel.h</a>>
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#include <<a href="qvaluelist-h.html">qvaluelist.h</a>>
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#include <<a href="qstring-h.html">qstring.h</a>>
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#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
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#include <<a href="qlayout-h.html">qlayout.h</a>>
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/*
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* Constructor
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*
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* Create all child widgets of the CheckList Widget
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*/
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<a name="f248"></a>CheckLists::CheckLists( <a href="qwidget.html">QWidget</a> *parent, const char *name )
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: <a href="qwidget.html">QWidget</a>( parent, name )
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{
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<a href="qhboxlayout.html">QHBoxLayout</a> *lay = new <a href="qhboxlayout.html">QHBoxLayout</a>( this );
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<a name="x426"></a> lay-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
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// create a widget which layouts its childs in a column
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<a href="qvboxlayout.html">QVBoxLayout</a> *vbox1 = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
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vbox1-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
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// First child: a Label
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<a name="x423"></a> vbox1-><a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Check some items!", this ) );
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// Second child: the ListView
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lv1 = new <a href="qlistview.html">QListView</a>( this );
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vbox1-><a href="qboxlayout.html#addWidget">addWidget</a>( lv1 );
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<a name="x427"></a> lv1-><a href="qlistview.html#addColumn">addColumn</a>( "Items" );
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<a name="x429"></a> lv1-><a href="qlistview.html#setRootIsDecorated">setRootIsDecorated</a>( TRUE );
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// create a list with 4 ListViewItems which will be parent items of other ListViewItems
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<a href="qvaluelist.html">QValueList</a><QListViewItem *> parentList;
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<a name="x434"></a> parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qchecklistitem.html">QCheckListItem</a>( lv1, "Parent Item 1", QCheckListItem::CheckBoxController ) );
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parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qchecklistitem.html">QCheckListItem</a>( lv1, "Parent Item 2", QCheckListItem::CheckBoxController ) );
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parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qchecklistitem.html">QCheckListItem</a>( lv1, "Parent Item 3", QCheckListItem::CheckBoxController ) );
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parentList.<a href="qvaluelist.html#append">append</a>( new <a href="qchecklistitem.html">QCheckListItem</a>( lv1, "Parent Item 4", QCheckListItem::CheckBoxController ) );
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<a href="qlistviewitem.html">QListViewItem</a> *item = 0;
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unsigned int num = 1;
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// go through the list of parent items...
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<a name="x436"></a><a name="x435"></a> for ( QValueList<QListViewItem*>::Iterator it = parentList.<a href="qvaluelist.html#begin">begin</a>(); it != parentList.<a href="qvaluelist.html#end">end</a>();
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( *it )->setOpen( TRUE ), ++it, num++ ) {
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item = *it;
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// ...and create 5 checkable child ListViewItems for each parent item
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for ( unsigned int i = 1; i <= 5; i++ )
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(void)new <a href="qchecklistitem.html">QCheckListItem</a>( item, QString( "%1. Child of Parent %2" ).arg( i ).arg( num ), QCheckListItem::CheckBox );
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}
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// Create another widget for layouting
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<a href="qvboxlayout.html">QVBoxLayout</a> *tmp = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
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tmp-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
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// create a pushbutton
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<a href="qpushbutton.html">QPushButton</a> *copy1 = new <a href="qpushbutton.html">QPushButton</a>( " -> ", this );
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tmp-><a href="qboxlayout.html#addWidget">addWidget</a>( copy1 );
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<a name="x437"></a><a name="x433"></a> copy1-><a href="qwidget.html#setMaximumWidth">setMaximumWidth</a>( copy1-><a href="qwidget.html#sizeHint">sizeHint</a>().width() );
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// connect the SIGNAL clicked() of the pushbutton with the SLOT copy1to2()
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<a href="qobject.html#connect">connect</a>( copy1, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( copy1to2() ) );
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// another widget for layouting
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<a href="qvboxlayout.html">QVBoxLayout</a> *vbox2 = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
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vbox2-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
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// and another label
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vbox2-><a href="qboxlayout.html#addWidget">addWidget</a>( new <a href="qlabel.html">QLabel</a>( "Check one item!", this ) );
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// create the second listview
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lv2 = new <a href="qlistview.html">QListView</a>( this );
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vbox2-><a href="qboxlayout.html#addWidget">addWidget</a>( lv2 );
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lv2-><a href="qlistview.html#addColumn">addColumn</a>( "Items" );
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lv2-><a href="qlistview.html#setRootIsDecorated">setRootIsDecorated</a>( TRUE );
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// another widget needed for layouting only
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tmp = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
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tmp-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
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// create another pushbutton...
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<a href="qpushbutton.html">QPushButton</a> *copy2 = new <a href="qpushbutton.html">QPushButton</a>( " -> ", this );
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lay-><a href="qboxlayout.html#addWidget">addWidget</a>( copy2 );
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copy2-><a href="qwidget.html#setMaximumWidth">setMaximumWidth</a>( copy2-><a href="qwidget.html#sizeHint">sizeHint</a>().width() );
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// ...and connect its clicked() SIGNAL to the copy2to3() SLOT
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<a href="qobject.html#connect">connect</a>( copy2, SIGNAL( <a href="qbutton.html#clicked">clicked</a>() ), this, SLOT( copy2to3() ) );
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tmp = new <a href="qvboxlayout.html">QVBoxLayout</a>( lay );
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tmp-><a href="qlayout.html#setMargin">setMargin</a>( 5 );
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// and create a label which will be at the right of the window
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label = new <a href="qlabel.html">QLabel</a>( "No Item yet...", this );
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tmp-><a href="qboxlayout.html#addWidget">addWidget</a>( label );
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}
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/*
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* SLOT copy1to2()
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*
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* Copies all checked ListViewItems from the first ListView to
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* the second one, and inserts them as Radio-ListViewItem.
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*/
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void <a name="f249"></a>CheckLists::copy1to2()
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{
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// create an iterator which operates on the first ListView
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<a href="qlistviewitemiterator.html">QListViewItemIterator</a> it( lv1 );
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<a name="x428"></a> lv2-><a href="qlistview.html#clear">clear</a>();
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// Insert first a controller Item into the second ListView. Always if Radio-ListViewItems
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// are inserted into a Listview, the parent item of these MUST be a controller Item!
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<a href="qchecklistitem.html">QCheckListItem</a> *item = new <a href="qchecklistitem.html">QCheckListItem</a>( lv2, "Controller", QCheckListItem::Controller );
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<a name="x431"></a> item-><a href="qlistviewitem.html#setOpen">setOpen</a>( TRUE );
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// iterate through the first ListView...
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<a name="x432"></a> for ( ; it.<a href="qlistviewitemiterator.html#current">current</a>(); ++it )
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// ...check state of childs, and...
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if ( it.<a href="qlistviewitemiterator.html#current">current</a>()->parent() )
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// ...if the item is checked...
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if ( ( (QCheckListItem*)it.<a href="qlistviewitemiterator.html#current">current</a>() )->isOn() )
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// ...insert a Radio-ListViewItem with the same text into the second ListView
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(void)new <a href="qchecklistitem.html">QCheckListItem</a>( item, it.<a href="qlistviewitemiterator.html#current">current</a>()->text( 0 ), QCheckListItem::RadioButton );
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<a name="x430"></a> if ( item-><a href="qlistviewitem.html#firstChild">firstChild</a>() )
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( ( <a href="qchecklistitem.html">QCheckListItem</a>* )item-><a href="qlistviewitem.html#firstChild">firstChild</a>() )->setOn( TRUE );
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}
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/*
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* SLOT copy2to3()
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*
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* Copies the checked item of the second ListView into the
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* Label at the right.
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*/
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void <a name="f250"></a>CheckLists::copy2to3()
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{
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// create an iterator which operates on the second ListView
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<a href="qlistviewitemiterator.html">QListViewItemIterator</a> it( lv2 );
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label-><a href="qlabel.html#setText">setText</a>( "No Item checked" );
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// iterate through the second ListView...
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for ( ; it.<a href="qlistviewitemiterator.html#current">current</a>(); ++it )
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// ...check state of childs, and...
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if ( it.<a href="qlistviewitemiterator.html#current">current</a>()->parent() )
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// ...if the item is checked...
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if ( ( (QCheckListItem*)it.<a href="qlistviewitemiterator.html#current">current</a>() )->isOn() )
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// ...set the text of the item to the label
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label-><a href="qlabel.html#setText">setText</a>( it.<a href="qlistviewitemiterator.html#current">current</a>()->text( 0 ) );
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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 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 "checklists.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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CheckLists checklists;
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checklists.<a href="qwidget.html#resize">resize</a>( 650, 350 );
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checklists.<a href="qwidget.html#setCaption">setCaption</a>( "Qt Example - CheckLists" );
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a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &checklists );
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checklists.<a href="qwidget.html#show">show</a>();
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return a.<a href="qapplication.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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||
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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>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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