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<h1 class="title">dragwidget.cpp Example File</h1>
<span class="subtitle">draganddrop/draggableicons/dragwidget.cpp</span>
<!-- $$$draganddrop/draggableicons/dragwidget.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
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** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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<span class="preprocessor">#include <QtWidgets></span>
<span class="preprocessor">#include "dragwidget.h"</span>
DragWidget<span class="operator">::</span>DragWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qframe.html">QFrame</a></span>(parent)
{
setMinimumSize(<span class="number">200</span><span class="operator">,</span> <span class="number">200</span>);
setFrameStyle(<span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>Sunken <span class="operator">|</span> <span class="type"><a href="qframe.html">QFrame</a></span><span class="operator">::</span>StyledPanel);
setAcceptDrops(<span class="keyword">true</span>);
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>boatIcon <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(<span class="keyword">this</span>);
boatIcon<span class="operator">-</span><span class="operator">></span>setPixmap(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(<span class="string">":/images/boat.png"</span>));
boatIcon<span class="operator">-</span><span class="operator">></span>move(<span class="number">10</span><span class="operator">,</span> <span class="number">10</span>);
boatIcon<span class="operator">-</span><span class="operator">></span>show();
boatIcon<span class="operator">-</span><span class="operator">></span>setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose);
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>carIcon <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(<span class="keyword">this</span>);
carIcon<span class="operator">-</span><span class="operator">></span>setPixmap(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(<span class="string">":/images/car.png"</span>));
carIcon<span class="operator">-</span><span class="operator">></span>move(<span class="number">100</span><span class="operator">,</span> <span class="number">10</span>);
carIcon<span class="operator">-</span><span class="operator">></span>show();
carIcon<span class="operator">-</span><span class="operator">></span>setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose);
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>houseIcon <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(<span class="keyword">this</span>);
houseIcon<span class="operator">-</span><span class="operator">></span>setPixmap(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span>(<span class="string">":/images/house.png"</span>));
houseIcon<span class="operator">-</span><span class="operator">></span>move(<span class="number">10</span><span class="operator">,</span> <span class="number">80</span>);
houseIcon<span class="operator">-</span><span class="operator">></span>show();
houseIcon<span class="operator">-</span><span class="operator">></span>setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose);
}
<span class="type">void</span> DragWidget<span class="operator">::</span>dragEnterEvent(<span class="type"><a href="../qtgui/qdragenterevent.html">QDragEnterEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>mimeData()<span class="operator">-</span><span class="operator">></span>hasFormat(<span class="string">"application/x-dnditemdata"</span>)) {
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>source() <span class="operator">=</span><span class="operator">=</span> <span class="keyword">this</span>) {
event<span class="operator">-</span><span class="operator">></span>setDropAction(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction);
event<span class="operator">-</span><span class="operator">></span>accept();
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>acceptProposedAction();
}
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>ignore();
}
}
<span class="type">void</span> DragWidget<span class="operator">::</span>dragMoveEvent(<span class="type"><a href="../qtgui/qdragmoveevent.html">QDragMoveEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>mimeData()<span class="operator">-</span><span class="operator">></span>hasFormat(<span class="string">"application/x-dnditemdata"</span>)) {
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>source() <span class="operator">=</span><span class="operator">=</span> <span class="keyword">this</span>) {
event<span class="operator">-</span><span class="operator">></span>setDropAction(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction);
event<span class="operator">-</span><span class="operator">></span>accept();
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>acceptProposedAction();
}
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>ignore();
}
}
<span class="type">void</span> DragWidget<span class="operator">::</span>dropEvent(<span class="type"><a href="../qtgui/qdropevent.html">QDropEvent</a></span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>mimeData()<span class="operator">-</span><span class="operator">></span>hasFormat(<span class="string">"application/x-dnditemdata"</span>)) {
<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> itemData <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>mimeData()<span class="operator">-</span><span class="operator">></span>data(<span class="string">"application/x-dnditemdata"</span>);
<span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> dataStream(<span class="operator">&</span>itemData<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly);
<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap;
<span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> offset;
dataStream <span class="operator">></span><span class="operator">></span> pixmap <span class="operator">></span><span class="operator">></span> offset;
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>newIcon <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(<span class="keyword">this</span>);
newIcon<span class="operator">-</span><span class="operator">></span>setPixmap(pixmap);
newIcon<span class="operator">-</span><span class="operator">></span>move(event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> offset);
newIcon<span class="operator">-</span><span class="operator">></span>show();
newIcon<span class="operator">-</span><span class="operator">></span>setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose);
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>source() <span class="operator">=</span><span class="operator">=</span> <span class="keyword">this</span>) {
event<span class="operator">-</span><span class="operator">></span>setDropAction(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction);
event<span class="operator">-</span><span class="operator">></span>accept();
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>acceptProposedAction();
}
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>ignore();
}
}
<span class="type">void</span> DragWidget<span class="operator">::</span>mousePressEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>child <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="qlabel.html">QLabel</a></span><span class="operator">*</span><span class="operator">></span>(childAt(event<span class="operator">-</span><span class="operator">></span>pos()));
<span class="keyword">if</span> (<span class="operator">!</span>child)
<span class="keyword">return</span>;
<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap <span class="operator">=</span> <span class="operator">*</span>child<span class="operator">-</span><span class="operator">></span>pixmap();
<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> itemData;
<span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> dataStream(<span class="operator">&</span>itemData<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly);
dataStream <span class="operator"><</span><span class="operator"><</span> pixmap <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> child<span class="operator">-</span><span class="operator">></span>pos());
<span class="type"><a href="../qtcore/qmimedata.html">QMimeData</a></span> <span class="operator">*</span>mimeData <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qmimedata.html">QMimeData</a></span>;
mimeData<span class="operator">-</span><span class="operator">></span>setData(<span class="string">"application/x-dnditemdata"</span><span class="operator">,</span> itemData);
<span class="type"><a href="../qtgui/qdrag.html">QDrag</a></span> <span class="operator">*</span>drag <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qdrag.html">QDrag</a></span>(<span class="keyword">this</span>);
drag<span class="operator">-</span><span class="operator">></span>setMimeData(mimeData);
drag<span class="operator">-</span><span class="operator">></span>setPixmap(pixmap);
drag<span class="operator">-</span><span class="operator">></span>setHotSpot(event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> child<span class="operator">-</span><span class="operator">></span>pos());
<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> tempPixmap <span class="operator">=</span> pixmap;
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter;
painter<span class="operator">.</span>begin(<span class="operator">&</span>tempPixmap);
painter<span class="operator">.</span>fillRect(pixmap<span class="operator">.</span>rect()<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(<span class="number">127</span><span class="operator">,</span> <span class="number">127</span><span class="operator">,</span> <span class="number">127</span><span class="operator">,</span> <span class="number">127</span>));
painter<span class="operator">.</span>end();
child<span class="operator">-</span><span class="operator">></span>setPixmap(tempPixmap);
<span class="keyword">if</span> (drag<span class="operator">-</span><span class="operator">></span>exec(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CopyAction <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CopyAction) <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction) {
child<span class="operator">-</span><span class="operator">></span>close();
} <span class="keyword">else</span> {
child<span class="operator">-</span><span class="operator">></span>show();
child<span class="operator">-</span><span class="operator">></span>setPixmap(pixmap);
}
}
</pre>
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<!-- @@@draganddrop/draggableicons/dragwidget.cpp -->
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