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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Drag and Drop (Simple)</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>Drag and Drop (Simple)</h1>
<p>
This provides a very simple example of Qt's drag and drop
functionality.
<p> For a more complete example see the <a href="dragdrop-example.html">Drag and Drop example</a>.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/main.h 3.3.7 edited Aug 31 2005 $
**
** Copyright (C) 1992-2005 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 <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qcursor-h.html">qcursor.h</a>>
#include <<a href="qsplitter-h.html">qsplitter.h</a>>
#include <<a href="qlistbox-h.html">qlistbox.h</a>>
#include <<a href="qiconview-h.html">qiconview.h</a>>
#include <<a href="qpixmap-h.html">qpixmap.h</a>>
class QDragEnterEvent;
class QDragDropEvent;
class DDListBox : public <a href="qlistbox.html">QListBox</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
DDListBox( <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0, WFlags f = 0 );
// Low-level drag and drop
void dragEnterEvent( <a href="qdragenterevent.html">QDragEnterEvent</a> *evt );
void dropEvent( <a href="qdropevent.html">QDropEvent</a> *evt );
void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> *evt );
void mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
private:
int dragging;
};
class DDIconViewItem : public <a href="qiconviewitem.html">QIconViewItem</a>
{
public:
DDIconViewItem( <a href="qiconview.html">QIconView</a> *parent, const <a href="qstring.html">QString</a>& text, const <a href="qpixmap.html">QPixmap</a>& icon ) :
<a href="qiconviewitem.html">QIconViewItem</a>( parent, text, icon ) {}
DDIconViewItem( <a href="qiconview.html">QIconView</a> *parent, const <a href="qstring.html">QString</a> &text ) :
<a href="qiconviewitem.html">QIconViewItem</a>( parent, text ) {}
// High-level drag and drop
bool acceptDrop( const <a href="qmimesource.html">QMimeSource</a> *mime ) const;
void dropped( <a href="qdropevent.html">QDropEvent</a> *evt, const <a href="qvaluelist.html">QValueList</a><QIconDragItem>& );
};
class DDIconView : public <a href="qiconview.html">QIconView</a>
{
Q_OBJECT
public:
DDIconView( <a href="qwidget.html">QWidget</a> * parent = 0, const char * name = 0, WFlags f = 0 ) :
<a href="qiconview.html">QIconView</a>( parent, name, f ) {}
// High-level drag and drop
<a href="qdragobject.html">QDragObject</a> *dragObject();
public slots:
void slotNewItem( <a href="qdropevent.html">QDropEvent</a> *evt, const <a href="qvaluelist.html">QValueList</a><QIconDragItem>& list );
};
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.3.7 edited Aug 31 2005 $
**
** Copyright (C) 1992-2005 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 "main.h"
const char* red_icon[]={
"16 16 2 1",
"r c red",
". c None",
"................",
"................",
"..rrrrrrrrrrrr..",
"..rrrrrrrrrrrr..",
"..rrrrrrrrrrrr..",
"..rrr......rrr..",
"..rrr......rrr..",
"..rrr......rrr..",
"..rrr......rrr..",
"..rrr......rrr..",
"..rrr......rrr..",
"..rrrrrrrrrrrr..",
"..rrrrrrrrrrrr..",
"..rrrrrrrrrrrr..",
"................",
"................"};
const char* blue_icon[]={
"16 16 2 1",
"b c blue",
". c None",
"................",
"................",
"..bbbbbbbbbbbb..",
"..bbbbbbbbbbbb..",
"..bbbbbbbbbbbb..",
"..bbb......bbb..",
"..bbb......bbb..",
"..bbb......bbb..",
"..bbb......bbb..",
"..bbb......bbb..",
"..bbb......bbb..",
"..bbbbbbbbbbbb..",
"..bbbbbbbbbbbb..",
"..bbbbbbbbbbbb..",
"................",
"................"};
const char* green_icon[]={
"16 16 2 1",
"g c green",
". c None",
"................",
"................",
"..gggggggggggg..",
"..gggggggggggg..",
"..gggggggggggg..",
"..ggg......ggg..",
"..ggg......ggg..",
"..ggg......ggg..",
"..ggg......ggg..",
"..ggg......ggg..",
"..ggg......ggg..",
"..gggggggggggg..",
"..gggggggggggg..",
"..gggggggggggg..",
"................",
"................"};
// ListBox -- low level drag and drop
<a name="f589"></a>DDListBox::DDListBox( <a href="qwidget.html">QWidget</a> * parent, const char * name, WFlags f ) :
<a href="qlistbox.html">QListBox</a>( parent, name, f )
{
<a href="qwidget.html#setAcceptDrops">setAcceptDrops</a>( TRUE );
dragging = FALSE;
}
<a name="x2830"></a>void DDListBox::<a href="qwidget.html#dragEnterEvent">dragEnterEvent</a>( <a href="qdragenterevent.html">QDragEnterEvent</a> *evt )
{
<a name="x2828"></a> if ( QTextDrag::<a href="qtextdrag.html#canDecode">canDecode</a>( evt ) )
<a name="x2820"></a> evt-><a href="qdragmoveevent.html#accept">accept</a>();
}
<a name="x2831"></a>void DDListBox::<a href="qwidget.html#dropEvent">dropEvent</a>( <a href="qdropevent.html">QDropEvent</a> *evt )
{
<a href="qstring.html">QString</a> text;
<a name="x2829"></a> if ( QTextDrag::<a href="qtextdrag.html#decode">decode</a>( evt, text ) )
<a href="qlistbox.html#insertItem">insertItem</a>( text );
}
<a name="x2833"></a>void DDListBox::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *evt )
{
QListBox::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( evt );
dragging = TRUE;
}
<a name="x2832"></a>void DDListBox::<a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * )
{
if ( dragging ) {
<a href="qdragobject.html">QDragObject</a> *d = new <a href="qtextdrag.html">QTextDrag</a>( currentText(), this );
<a name="x2819"></a> d-><a href="qdragobject.html#dragCopy">dragCopy</a>(); // do NOT delete d.
dragging = FALSE;
}
}
// IconViewIcon -- high level drag and drop
<a name="x2823"></a>bool DDIconViewItem::<a href="qiconviewitem.html#acceptDrop">acceptDrop</a>( const <a href="qmimesource.html">QMimeSource</a> *mime ) const
{
<a name="x2826"></a> if ( mime-><a href="qmimesource.html#provides">provides</a>( "text/plain" ) )
return TRUE;
return FALSE;
}
<a name="x2824"></a>void DDIconViewItem::<a href="qiconviewitem.html#dropped">dropped</a>( <a href="qdropevent.html">QDropEvent</a> *evt, const <a href="qvaluelist.html">QValueList</a><QIconDragItem>& )
{
<a href="qstring.html">QString</a> label;
if ( QTextDrag::<a href="qtextdrag.html#decode">decode</a>( evt, label ) )
setText( label );
}
// IconView -- high level drag and drop
<a name="x2821"></a>QDragObject *DDIconView::<a href="qiconview.html#dragObject">dragObject</a>()
{
return new <a href="qtextdrag.html">QTextDrag</a>( <a href="qiconview.html#currentItem">currentItem</a>()->text(), this );
}
void <a name="f588"></a>DDIconView::slotNewItem( <a href="qdropevent.html">QDropEvent</a> *evt, const <a href="qvaluelist.html">QValueList</a><QIconDragItem>& )
{
<a href="qstring.html">QString</a> label;
if ( QTextDrag::<a href="qtextdrag.html#decode">decode</a>( evt, label ) ) {
DDIconViewItem *item = new DDIconViewItem( this, label );
<a name="x2825"></a> item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE );
}
}
int main( int argc, char *argv[] )
{
<a href="qapplication.html">QApplication</a> app( argc, argv );
// Create and show the widgets
<a href="qsplitter.html">QSplitter</a> *split = new <a href="qsplitter.html">QSplitter</a>();
DDIconView *iv = new DDIconView( split );
(void) new DDListBox( split );
app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( split );
split-><a href="qwidget.html#resize">resize</a>( 600, 400 );
split-><a href="qwidget.html#show">show</a>();
// Set up the connection so that we can drop items into the icon view
QObject::<a href="qobject.html#connect">connect</a>(
<a name="x2822"></a> iv, SIGNAL(<a href="qiconview.html#dropped">dropped</a>(QDropEvent*, const <a href="qvaluelist.html">QValueList</a><QIconDragItem>&)),
iv, SLOT(slotNewItem(QDropEvent*, const <a href="qvaluelist.html">QValueList</a><QIconDragItem>&)));
// Populate the QIconView with icons
DDIconViewItem *item;
item = new DDIconViewItem( iv, "Red", QPixmap( red_icon ) );
item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE );
item = new DDIconViewItem( iv, "Green", QPixmap( green_icon ) );
item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE );
item = new DDIconViewItem( iv, "Blue", QPixmap( blue_icon ) );
item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE );
return app.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p> <p>See also <a href="examples.html">Examples</a>.
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<td>Copyright © 2005
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt 3.3.7</div>
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