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306 lines
11 KiB
306 lines
11 KiB
<!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/iconview/simple_dd/simple_dd.doc:1 -->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Drag and Drop (Simple)</title>
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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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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Functions</font></a>
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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>
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<p>
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This provides a very simple example of TQt's drag and drop
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functionality.
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<p> For a more complete example see the <a href="dragdrop-example.html">Drag and Drop example</a>.
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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/main.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 TQt. 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 <<a href="qapplication-h.html">ntqapplication.h</a>>
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#include <<a href="qcursor-h.html">ntqcursor.h</a>>
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#include <<a href="qsplitter-h.html">ntqsplitter.h</a>>
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#include <<a href="qlistbox-h.html">ntqlistbox.h</a>>
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#include <<a href="qiconview-h.html">ntqiconview.h</a>>
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#include <<a href="qpixmap-h.html">ntqpixmap.h</a>>
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class TQDragEnterEvent;
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class TQDragDropEvent;
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class DDListBox : public <a href="ntqlistbox.html">TQListBox</a>
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{
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<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
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public:
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DDListBox( <a href="ntqwidget.html">TQWidget</a> * parent = 0, const char * name = 0, WFlags f = 0 );
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// Low-level drag and drop
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void dragEnterEvent( <a href="qdragenterevent.html">TQDragEnterEvent</a> *evt );
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void dropEvent( <a href="qdropevent.html">TQDropEvent</a> *evt );
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void mousePressEvent( <a href="qmouseevent.html">TQMouseEvent</a> *evt );
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void mouseMoveEvent( <a href="qmouseevent.html">TQMouseEvent</a> * );
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private:
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int dragging;
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};
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class DDIconViewItem : public <a href="qiconviewitem.html">TQIconViewItem</a>
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{
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public:
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DDIconViewItem( <a href="ntqiconview.html">TQIconView</a> *parent, const <a href="ntqstring.html">TQString</a>& text, const <a href="ntqpixmap.html">TQPixmap</a>& icon ) :
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<a href="qiconviewitem.html">TQIconViewItem</a>( parent, text, icon ) {}
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DDIconViewItem( <a href="ntqiconview.html">TQIconView</a> *parent, const <a href="ntqstring.html">TQString</a> &text ) :
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<a href="qiconviewitem.html">TQIconViewItem</a>( parent, text ) {}
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// High-level drag and drop
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bool acceptDrop( const <a href="qmimesource.html">TQMimeSource</a> *mime ) const;
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void dropped( <a href="qdropevent.html">TQDropEvent</a> *evt, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>& );
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};
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class DDIconView : public <a href="ntqiconview.html">TQIconView</a>
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{
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TQ_OBJECT
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public:
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DDIconView( <a href="ntqwidget.html">TQWidget</a> * parent = 0, const char * name = 0, WFlags f = 0 ) :
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<a href="ntqiconview.html">TQIconView</a>( parent, name, f ) {}
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// High-level drag and drop
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<a href="ntqdragobject.html">TQDragObject</a> *dragObject();
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public slots:
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void slotNewItem( <a href="qdropevent.html">TQDropEvent</a> *evt, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>& list );
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};
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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/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 TQt. 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 "main.h"
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const char* red_icon[]={
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"16 16 2 1",
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"r c red",
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". c None",
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"................",
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"................",
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"..rrrrrrrrrrrr..",
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"..rrrrrrrrrrrr..",
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"..rrrrrrrrrrrr..",
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"..rrr......rrr..",
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"..rrr......rrr..",
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"..rrr......rrr..",
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"..rrr......rrr..",
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"..rrr......rrr..",
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"..rrr......rrr..",
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"..rrrrrrrrrrrr..",
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"..rrrrrrrrrrrr..",
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"..rrrrrrrrrrrr..",
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"................",
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"................"};
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const char* blue_icon[]={
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"16 16 2 1",
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"b c blue",
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". c None",
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"................",
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"................",
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"..bbbbbbbbbbbb..",
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"..bbbbbbbbbbbb..",
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"..bbbbbbbbbbbb..",
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"..bbb......bbb..",
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"..bbb......bbb..",
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"..bbb......bbb..",
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"..bbb......bbb..",
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"..bbb......bbb..",
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"..bbb......bbb..",
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"..bbbbbbbbbbbb..",
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"..bbbbbbbbbbbb..",
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"..bbbbbbbbbbbb..",
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"................",
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"................"};
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const char* green_icon[]={
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"16 16 2 1",
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"g c green",
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". c None",
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"................",
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"................",
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"..gggggggggggg..",
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"..gggggggggggg..",
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"..gggggggggggg..",
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"..ggg......ggg..",
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"..ggg......ggg..",
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"..ggg......ggg..",
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"..ggg......ggg..",
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"..ggg......ggg..",
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"..ggg......ggg..",
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"..gggggggggggg..",
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"..gggggggggggg..",
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"..gggggggggggg..",
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"................",
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"................"};
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// ListBox -- low level drag and drop
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<a name="f589"></a>DDListBox::DDListBox( <a href="ntqwidget.html">TQWidget</a> * parent, const char * name, WFlags f ) :
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<a href="ntqlistbox.html">TQListBox</a>( parent, name, f )
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{
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<a href="ntqwidget.html#setAcceptDrops">setAcceptDrops</a>( TRUE );
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dragging = FALSE;
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}
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<a name="x2829"></a>void DDListBox::<a href="ntqwidget.html#dragEnterEvent">dragEnterEvent</a>( <a href="qdragenterevent.html">TQDragEnterEvent</a> *evt )
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{
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<a name="x2827"></a> if ( TQTextDrag::<a href="qtextdrag.html#canDecode">canDecode</a>( evt ) )
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<a name="x2819"></a> evt-><a href="qdragmoveevent.html#accept">accept</a>();
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}
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<a name="x2830"></a>void DDListBox::<a href="ntqwidget.html#dropEvent">dropEvent</a>( <a href="qdropevent.html">TQDropEvent</a> *evt )
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{
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<a href="ntqstring.html">TQString</a> text;
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<a name="x2828"></a> if ( TQTextDrag::<a href="qtextdrag.html#decode">decode</a>( evt, text ) )
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<a href="ntqlistbox.html#insertItem">insertItem</a>( text );
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}
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<a name="x2832"></a>void DDListBox::<a href="ntqwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *evt )
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{
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TQListBox::<a href="ntqwidget.html#mousePressEvent">mousePressEvent</a>( evt );
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dragging = TRUE;
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}
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<a name="x2831"></a>void DDListBox::<a href="ntqwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> * )
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{
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if ( dragging ) {
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<a href="ntqdragobject.html">TQDragObject</a> *d = new <a href="qtextdrag.html">TQTextDrag</a>( currentText(), this );
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<a name="x2818"></a> d-><a href="ntqdragobject.html#dragCopy">dragCopy</a>(); // do NOT delete d.
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dragging = FALSE;
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}
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}
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// IconViewIcon -- high level drag and drop
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<a name="x2822"></a>bool DDIconViewItem::<a href="qiconviewitem.html#acceptDrop">acceptDrop</a>( const <a href="qmimesource.html">TQMimeSource</a> *mime ) const
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{
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<a name="x2825"></a> if ( mime-><a href="qmimesource.html#provides">provides</a>( "text/plain" ) )
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return TRUE;
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return FALSE;
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}
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<a name="x2823"></a>void DDIconViewItem::<a href="qiconviewitem.html#dropped">dropped</a>( <a href="qdropevent.html">TQDropEvent</a> *evt, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>& )
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{
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<a href="ntqstring.html">TQString</a> label;
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if ( TQTextDrag::<a href="qtextdrag.html#decode">decode</a>( evt, label ) )
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setText( label );
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}
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// IconView -- high level drag and drop
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<a name="x2820"></a>TQDragObject *DDIconView::<a href="ntqiconview.html#dragObject">dragObject</a>()
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{
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return new <a href="qtextdrag.html">TQTextDrag</a>( <a href="ntqiconview.html#currentItem">currentItem</a>()->text(), this );
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}
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void <a name="f588"></a>DDIconView::slotNewItem( <a href="qdropevent.html">TQDropEvent</a> *evt, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>& )
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{
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<a href="ntqstring.html">TQString</a> label;
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if ( TQTextDrag::<a href="qtextdrag.html#decode">decode</a>( evt, label ) ) {
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DDIconViewItem *item = new DDIconViewItem( this, label );
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<a name="x2824"></a> item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE );
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}
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}
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int main( int argc, char *argv[] )
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{
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<a href="ntqapplication.html">TQApplication</a> app( argc, argv );
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// Create and show the widgets
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<a href="ntqsplitter.html">TQSplitter</a> *split = new <a href="ntqsplitter.html">TQSplitter</a>();
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DDIconView *iv = new DDIconView( split );
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(void) new DDListBox( split );
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app.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( split );
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split-><a href="ntqwidget.html#resize">resize</a>( 600, 400 );
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split-><a href="ntqwidget.html#show">show</a>();
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// Set up the connection so that we can drop items into the icon view
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TQObject::<a href="ntqobject.html#connect">connect</a>(
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<a name="x2821"></a> iv, TQ_SIGNAL(<a href="ntqiconview.html#dropped">dropped</a>(TQDropEvent*, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>&)),
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iv, TQ_SLOT(slotNewItem(TQDropEvent*, const <a href="ntqvaluelist.html">TQValueList</a><TQIconDragItem>&)));
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// Populate the TQIconView with icons
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DDIconViewItem *item;
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item = new DDIconViewItem( iv, "Red", TQPixmap( red_icon ) );
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item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE );
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item = new DDIconViewItem( iv, "Green", TQPixmap( green_icon ) );
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item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE );
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item = new DDIconViewItem( iv, "Blue", TQPixmap( blue_icon ) );
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item-><a href="qiconviewitem.html#setRenameEnabled">setRenameEnabled</a>( TRUE );
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return app.<a href="ntqapplication.html#exec">exec</a>();
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}
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</pre>
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<p> <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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<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>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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