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<h1 class="title">pieceslist.cpp Example File</h1>
<span class="subtitle">draganddrop/puzzle/pieceslist.cpp</span>
<!-- $$$draganddrop/puzzle/pieceslist.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;pieceslist.h&quot;</span>

  <span class="preprocessor">#include &lt;QDrag&gt;</span>
  <span class="preprocessor">#include &lt;QDragEnterEvent&gt;</span>
  <span class="preprocessor">#include &lt;QMimeData&gt;</span>

  PiecesList<span class="operator">::</span>PiecesList(<span class="type">int</span> pieceSize<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="qlistwidget.html">QListWidget</a></span>(parent)<span class="operator">,</span> m_PieceSize(pieceSize)
  {
      setDragEnabled(<span class="keyword">true</span>);
      setViewMode(<span class="type"><a href="qlistview.html">QListView</a></span><span class="operator">::</span>IconMode);
      setIconSize(<span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(m_PieceSize<span class="operator">,</span> m_PieceSize));
      setSpacing(<span class="number">10</span>);
      setAcceptDrops(<span class="keyword">true</span>);
      setDropIndicatorShown(<span class="keyword">true</span>);
  }

  <span class="type">void</span> PiecesList<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(PiecesList<span class="operator">::</span>puzzleMimeType()))
          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> PiecesList<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">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>hasFormat(PiecesList<span class="operator">::</span>puzzleMimeType())) {
          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> {
          event<span class="operator">-</span><span class="operator">&gt;</span>ignore();
      }
  }

  <span class="type">void</span> PiecesList<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(PiecesList<span class="operator">::</span>puzzleMimeType())) {
          <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(PiecesList<span class="operator">::</span>puzzleMimeType());
          <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);
          <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap;
          <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> location;
          dataStream <span class="operator">&gt;</span><span class="operator">&gt;</span> pixmap <span class="operator">&gt;</span><span class="operator">&gt;</span> location;

          addPiece(pixmap<span class="operator">,</span> location);

          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> {
          event<span class="operator">-</span><span class="operator">&gt;</span>ignore();
      }
  }

  <span class="type">void</span> PiecesList<span class="operator">::</span>addPiece(<span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap<span class="operator">,</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> location)
  {
      <span class="type"><a href="qlistwidgetitem.html">QListWidgetItem</a></span> <span class="operator">*</span>pieceItem <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlistwidgetitem.html">QListWidgetItem</a></span>(<span class="keyword">this</span>);
      pieceItem<span class="operator">-</span><span class="operator">&gt;</span>setIcon(<span class="type"><a href="../qtgui/qicon.html">QIcon</a></span>(pixmap));
      pieceItem<span class="operator">-</span><span class="operator">&gt;</span>setData(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole<span class="operator">,</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span>(pixmap));
      pieceItem<span class="operator">-</span><span class="operator">&gt;</span>setData(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole<span class="operator">+</span><span class="number">1</span><span class="operator">,</span> location);
      pieceItem<span class="operator">-</span><span class="operator">&gt;</span>setFlags(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemIsEnabled <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemIsSelectable <span class="operator">|</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ItemIsDragEnabled);
  }

  <span class="type">void</span> PiecesList<span class="operator">::</span>startDrag(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DropActions <span class="comment">/*supportedActions*/</span>)
  {
      <span class="type"><a href="qlistwidgetitem.html">QListWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> currentItem();

      <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);
      <span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span> pixmap <span class="operator">=</span> qvariant_cast<span class="operator">&lt;</span><span class="type"><a href="../qtgui/qpixmap.html">QPixmap</a></span><span class="operator">&gt;</span>(item<span class="operator">-</span><span class="operator">&gt;</span>data(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole));
      <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> location <span class="operator">=</span> item<span class="operator">-</span><span class="operator">&gt;</span>data(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>UserRole<span class="operator">+</span><span class="number">1</span>)<span class="operator">.</span>toPoint();

      dataStream <span class="operator">&lt;</span><span class="operator">&lt;</span> pixmap <span class="operator">&lt;</span><span class="operator">&lt;</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(PiecesList<span class="operator">::</span>puzzleMimeType()<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(<span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(pixmap<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> pixmap<span class="operator">.</span>height()<span class="operator">/</span><span class="number">2</span>));
      drag<span class="operator">-</span><span class="operator">&gt;</span>setPixmap(pixmap);

      <span class="keyword">if</span> (drag<span class="operator">-</span><span class="operator">&gt;</span>exec(<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>MoveAction)
          <span class="keyword">delete</span> takeItem(row(item));
  }

</pre>
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<!-- @@@draganddrop/puzzle/pieceslist.cpp -->
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