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<h1 class="title">puzzlewidget.cpp Example File</h1>
<span class="small-subtitle">draganddrop/puzzle/puzzlewidget.cpp</span>
<!-- $$$draganddrop/puzzle/puzzlewidget.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include <QtGui></span>
<span class="preprocessor">#include "puzzlewidget.h"</span>
PuzzleWidget<span class="operator">::</span>PuzzleWidget(<span class="type">int</span> imageSize<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)<span class="operator">,</span> m_ImageSize(imageSize)
{
setAcceptDrops(<span class="keyword">true</span>);
setMinimumSize(m_ImageSize<span class="operator">,</span> m_ImageSize);
setMaximumSize(m_ImageSize<span class="operator">,</span> m_ImageSize);
}
<span class="type">void</span> PuzzleWidget<span class="operator">::</span>clear()
{
pieceLocations<span class="operator">.</span>clear();
piecePixmaps<span class="operator">.</span>clear();
pieceRects<span class="operator">.</span>clear();
highlightedRect <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>();
inPlace <span class="operator">=</span> <span class="number">0</span>;
update();
}
<span class="type">void</span> PuzzleWidget<span class="operator">::</span>dragEnterEvent(<span class="type"><a href="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">"image/x-puzzle-piece"</span>))
event<span class="operator">-</span><span class="operator">></span>accept();
<span class="keyword">else</span>
event<span class="operator">-</span><span class="operator">></span>ignore();
}
<span class="type">void</span> PuzzleWidget<span class="operator">::</span>dragLeaveEvent(<span class="type"><a href="qdragleaveevent.html">QDragLeaveEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qrect.html">QRect</a></span> updateRect <span class="operator">=</span> highlightedRect;
highlightedRect <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>();
update(updateRect);
event<span class="operator">-</span><span class="operator">></span>accept();
}
<span class="type">void</span> PuzzleWidget<span class="operator">::</span>dragMoveEvent(<span class="type"><a href="qdragmoveevent.html">QDragMoveEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qrect.html">QRect</a></span> updateRect <span class="operator">=</span> highlightedRect<span class="operator">.</span>unite(targetSquare(event<span class="operator">-</span><span class="operator">></span>pos()));
<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">"image/x-puzzle-piece"</span>)
<span class="operator">&</span><span class="operator">&</span> findPiece(targetSquare(event<span class="operator">-</span><span class="operator">></span>pos())) <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {
highlightedRect <span class="operator">=</span> targetSquare(event<span class="operator">-</span><span class="operator">></span>pos());
event<span class="operator">-</span><span class="operator">></span>setDropAction(<span class="type"><a href="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> {
highlightedRect <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>();
event<span class="operator">-</span><span class="operator">></span>ignore();
}
update(updateRect);
}
<span class="type">void</span> PuzzleWidget<span class="operator">::</span>dropEvent(<span class="type"><a href="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">"image/x-puzzle-piece"</span>)
<span class="operator">&</span><span class="operator">&</span> findPiece(targetSquare(event<span class="operator">-</span><span class="operator">></span>pos())) <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {
<span class="type"><a href="qbytearray.html">QByteArray</a></span> pieceData <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">"image/x-puzzle-piece"</span>);
<span class="type"><a href="qdatastream.html">QDataStream</a></span> dataStream(<span class="operator">&</span>pieceData<span class="operator">,</span> <span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly);
<span class="type"><a href="qrect.html">QRect</a></span> square <span class="operator">=</span> targetSquare(event<span class="operator">-</span><span class="operator">></span>pos());
<span class="type"><a href="qpixmap.html">QPixmap</a></span> pixmap;
<span class="type"><a href="qpoint.html">QPoint</a></span> location;
dataStream <span class="operator">></span><span class="operator">></span> pixmap <span class="operator">></span><span class="operator">></span> location;
pieceLocations<span class="operator">.</span>append(location);
piecePixmaps<span class="operator">.</span>append(pixmap);
pieceRects<span class="operator">.</span>append(square);
highlightedRect <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>();
update(square);
event<span class="operator">-</span><span class="operator">></span>setDropAction(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MoveAction);
event<span class="operator">-</span><span class="operator">></span>accept();
<span class="keyword">if</span> (location <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(square<span class="operator">.</span>x()<span class="operator">/</span>pieceSize()<span class="operator">,</span> square<span class="operator">.</span>y()<span class="operator">/</span>pieceSize())) {
inPlace<span class="operator">+</span><span class="operator">+</span>;
<span class="keyword">if</span> (inPlace <span class="operator">=</span><span class="operator">=</span> <span class="number">25</span>)
<span class="keyword">emit</span> puzzleCompleted();
}
} <span class="keyword">else</span> {
highlightedRect <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>();
event<span class="operator">-</span><span class="operator">></span>ignore();
}
}
<span class="type">int</span> PuzzleWidget<span class="operator">::</span>findPiece(<span class="keyword">const</span> <span class="type"><a href="qrect.html">QRect</a></span> <span class="operator">&</span>pieceRect) <span class="keyword">const</span>
{
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> pieceRects<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">if</span> (pieceRect <span class="operator">=</span><span class="operator">=</span> pieceRects<span class="operator">[</span>i<span class="operator">]</span>) {
<span class="keyword">return</span> i;
}
}
<span class="keyword">return</span> <span class="operator">-</span><span class="number">1</span>;
}
<span class="type">void</span> PuzzleWidget<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qrect.html">QRect</a></span> square <span class="operator">=</span> targetSquare(event<span class="operator">-</span><span class="operator">></span>pos());
<span class="type">int</span> found <span class="operator">=</span> findPiece(square);
<span class="keyword">if</span> (found <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
<span class="keyword">return</span>;
<span class="type"><a href="qpoint.html">QPoint</a></span> location <span class="operator">=</span> pieceLocations<span class="operator">[</span>found<span class="operator">]</span>;
<span class="type"><a href="qpixmap.html">QPixmap</a></span> pixmap <span class="operator">=</span> piecePixmaps<span class="operator">[</span>found<span class="operator">]</span>;
pieceLocations<span class="operator">.</span>removeAt(found);
piecePixmaps<span class="operator">.</span>removeAt(found);
pieceRects<span class="operator">.</span>removeAt(found);
<span class="keyword">if</span> (location <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(square<span class="operator">.</span>x()<span class="operator">/</span>pieceSize()<span class="operator">,</span> square<span class="operator">.</span>y()<span class="operator">/</span>pieceSize()))
inPlace<span class="operator">-</span><span class="operator">-</span>;
update(square);
<span class="type"><a href="qbytearray.html">QByteArray</a></span> itemData;
<span class="type"><a href="qdatastream.html">QDataStream</a></span> dataStream(<span class="operator">&</span>itemData<span class="operator">,</span> <span class="type"><a href="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> location;
<span class="type"><a href="qmimedata.html">QMimeData</a></span> <span class="operator">*</span>mimeData <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmimedata.html">QMimeData</a></span>;
mimeData<span class="operator">-</span><span class="operator">></span>setData(<span class="string">"image/x-puzzle-piece"</span><span class="operator">,</span> itemData);
<span class="type"><a href="qdrag.html">QDrag</a></span> <span class="operator">*</span>drag <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="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>setHotSpot(event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> square<span class="operator">.</span>topLeft());
drag<span class="operator">-</span><span class="operator">></span>setPixmap(pixmap);
<span class="keyword">if</span> (<span class="operator">!</span>(drag<span class="operator">-</span><span class="operator">></span>exec(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MoveAction) <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MoveAction)) {
pieceLocations<span class="operator">.</span>insert(found<span class="operator">,</span> location);
piecePixmaps<span class="operator">.</span>insert(found<span class="operator">,</span> pixmap);
pieceRects<span class="operator">.</span>insert(found<span class="operator">,</span> square);
update(targetSquare(event<span class="operator">-</span><span class="operator">></span>pos()));
<span class="keyword">if</span> (location <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(square<span class="operator">.</span>x()<span class="operator">/</span>pieceSize()<span class="operator">,</span> square<span class="operator">.</span>y()<span class="operator">/</span>pieceSize()))
inPlace<span class="operator">+</span><span class="operator">+</span>;
}
}
<span class="type">void</span> PuzzleWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qpainter.html">QPainter</a></span> painter;
painter<span class="operator">.</span>begin(<span class="keyword">this</span>);
painter<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">></span>rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
<span class="keyword">if</span> (highlightedRect<span class="operator">.</span>isValid()) {
painter<span class="operator">.</span>setBrush(<span class="type"><a href="qcolor.html">QColor</a></span>(<span class="string">"#ffcccc"</span>));
painter<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoPen);
painter<span class="operator">.</span>drawRect(highlightedRect<span class="operator">.</span>adjusted(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>));
}
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> pieceRects<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
painter<span class="operator">.</span>drawPixmap(pieceRects<span class="operator">[</span>i<span class="operator">]</span><span class="operator">,</span> piecePixmaps<span class="operator">[</span>i<span class="operator">]</span>);
}
painter<span class="operator">.</span>end();
}
<span class="keyword">const</span> <span class="type"><a href="qrect.html">QRect</a></span> PuzzleWidget<span class="operator">::</span>targetSquare(<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&</span>position) <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="qrect.html">QRect</a></span>(position<span class="operator">.</span>x()<span class="operator">/</span>pieceSize() <span class="operator">*</span> pieceSize()<span class="operator">,</span> position<span class="operator">.</span>y()<span class="operator">/</span>pieceSize() <span class="operator">*</span> pieceSize()<span class="operator">,</span> pieceSize()<span class="operator">,</span> pieceSize());
}
<span class="type">int</span> PuzzleWidget<span class="operator">::</span>pieceSize() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_ImageSize <span class="operator">/</span> <span class="number">5</span>;
}
<span class="type">int</span> PuzzleWidget<span class="operator">::</span>imageSize() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_ImageSize;
}</pre>
</div>
<!-- @@@draganddrop/puzzle/puzzlewidget.cpp -->
</div>
</div>
</div>
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<span></span>
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<p>
<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.</p>
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