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<h1 class="title">puzzlewidget.cpp Example File</h1>
<span class="subtitle">itemviews/puzzle/puzzlewidget.cpp</span>
<!-- $$$itemviews/puzzle/puzzlewidget.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:
  **
  ** &quot;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
  ** &quot;AS IS&quot; 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.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;puzzlewidget.h&quot;</span>

  <span class="preprocessor">#include &lt;QtWidgets&gt;</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()
  {
      pieces<span class="operator">.</span>clear();
      highlightedRect <span class="operator">=</span> <span class="type"><a href="../qtcore/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="../qtgui/qdragenterevent.html">QDragEnterEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>hasFormat(<span class="string">&quot;image/x-puzzle-piece&quot;</span>))
          event<span class="operator">-</span><span class="operator">&gt;</span>accept();
      <span class="keyword">else</span>
          event<span class="operator">-</span><span class="operator">&gt;</span>ignore();
  }

  <span class="type">void</span> PuzzleWidget<span class="operator">::</span>dragLeaveEvent(<span class="type"><a href="../qtgui/qdragleaveevent.html">QDragLeaveEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> updateRect <span class="operator">=</span> highlightedRect;
      highlightedRect <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>();
      update(updateRect);
      event<span class="operator">-</span><span class="operator">&gt;</span>accept();
  }

  <span class="type">void</span> PuzzleWidget<span class="operator">::</span>dragMoveEvent(<span class="type"><a href="../qtgui/qdragmoveevent.html">QDragMoveEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> updateRect <span class="operator">=</span> highlightedRect<span class="operator">.</span>united(targetSquare(event<span class="operator">-</span><span class="operator">&gt;</span>pos()));

      <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>hasFormat(<span class="string">&quot;image/x-puzzle-piece&quot;</span>)
          <span class="operator">&amp;</span><span class="operator">&amp;</span> findPiece(targetSquare(event<span class="operator">-</span><span class="operator">&gt;</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">&gt;</span>pos());
          event<span class="operator">-</span><span class="operator">&gt;</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">&gt;</span>accept();
      } <span class="keyword">else</span> {
          highlightedRect <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>();
          event<span class="operator">-</span><span class="operator">&gt;</span>ignore();
      }

      update(updateRect);
  }

  <span class="type">void</span> PuzzleWidget<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">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>hasFormat(<span class="string">&quot;image/x-puzzle-piece&quot;</span>)
          <span class="operator">&amp;</span><span class="operator">&amp;</span> findPiece(targetSquare(event<span class="operator">-</span><span class="operator">&gt;</span>pos())) <span class="operator">=</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>) {

          <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> pieceData <span class="operator">=</span> event<span class="operator">-</span><span class="operator">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>data(<span class="string">&quot;image/x-puzzle-piece&quot;</span>);
          <span class="type"><a href="../qtcore/qdatastream.html">QDataStream</a></span> dataStream(<span class="operator">&amp;</span>pieceData<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly);
          Piece piece;
          piece<span class="operator">.</span>rect <span class="operator">=</span> targetSquare(event<span class="operator">-</span><span class="operator">&gt;</span>pos());
          dataStream <span class="operator">&gt;</span><span class="operator">&gt;</span> piece<span class="operator">.</span>pixmap <span class="operator">&gt;</span><span class="operator">&gt;</span> piece<span class="operator">.</span>location;

          pieces<span class="operator">.</span>append(piece);

          highlightedRect <span class="operator">=</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>();
          update(piece<span class="operator">.</span>rect);

          event<span class="operator">-</span><span class="operator">&gt;</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">&gt;</span>accept();

          <span class="keyword">if</span> (piece<span class="operator">.</span>location <span class="operator">=</span><span class="operator">=</span> piece<span class="operator">.</span>rect<span class="operator">.</span>topLeft() <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="../qtcore/qrect.html">QRect</a></span>();
          event<span class="operator">-</span><span class="operator">&gt;</span>ignore();
      }
  }

  <span class="type">int</span> PuzzleWidget<span class="operator">::</span>findPiece(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> <span class="operator">&amp;</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><span class="operator">,</span> size <span class="operator">=</span> pieces<span class="operator">.</span>size(); i <span class="operator">&lt;</span> size; <span class="operator">+</span><span class="operator">+</span>i) {
          <span class="keyword">if</span> (pieces<span class="operator">.</span>at(i)<span class="operator">.</span>rect <span class="operator">=</span><span class="operator">=</span> pieceRect)
              <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="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> square <span class="operator">=</span> targetSquare(event<span class="operator">-</span><span class="operator">&gt;</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>;

      Piece piece <span class="operator">=</span> pieces<span class="operator">.</span>takeAt(found);

      <span class="keyword">if</span> (piece<span class="operator">.</span>location <span class="operator">=</span><span class="operator">=</span> square<span class="operator">.</span>topLeft() <span class="operator">/</span> pieceSize())
          inPlace<span class="operator">-</span><span class="operator">-</span>;

      update(square);

      <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">&amp;</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">&lt;</span><span class="operator">&lt;</span> piece<span class="operator">.</span>pixmap <span class="operator">&lt;</span><span class="operator">&lt;</span> piece<span class="operator">.</span>location;

      <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">&gt;</span>setData(<span class="string">&quot;image/x-puzzle-piece&quot;</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">&gt;</span>setMimeData(mimeData);
      drag<span class="operator">-</span><span class="operator">&gt;</span>setHotSpot(event<span class="operator">-</span><span class="operator">&gt;</span>pos() <span class="operator">-</span> square<span class="operator">.</span>topLeft());
      drag<span class="operator">-</span><span class="operator">&gt;</span>setPixmap(piece<span class="operator">.</span>pixmap);

      <span class="keyword">if</span> (drag<span class="operator">-</span><span class="operator">&gt;</span>start(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>MoveAction) <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>IgnoreAction) {
          pieces<span class="operator">.</span>insert(found<span class="operator">,</span> piece);
          update(targetSquare(event<span class="operator">-</span><span class="operator">&gt;</span>pos()));

          <span class="keyword">if</span> (piece<span class="operator">.</span>location <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/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="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>);
      painter<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">&gt;</span>rect()<span class="operator">,</span> <span class="type"><a href="../qtcore/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="../qtgui/qcolor.html">QColor</a></span>(<span class="string">&quot;#ffcccc&quot;</span>));
          painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtcore/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="keyword">const</span> Piece <span class="operator">&amp;</span>piece : pieces)
          painter<span class="operator">.</span>drawPixmap(piece<span class="operator">.</span>rect<span class="operator">,</span> piece<span class="operator">.</span>pixmap);
  }

  <span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> PuzzleWidget<span class="operator">::</span>targetSquare(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> <span class="operator">&amp;</span>position) <span class="keyword">const</span>
  {
      <span class="keyword">return</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(position <span class="operator">/</span> pieceSize() <span class="operator">*</span> pieceSize()<span class="operator">,</span>
                   <span class="type"><a href="../qtcore/qsize.html">QSize</a></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>
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<!-- @@@itemviews/puzzle/puzzlewidget.cpp -->
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