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<td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-draganddrop-fridgemagnets-example.html">Fridge Magnets Example</a></td><td >dragwidget.cpp Example File</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">dragwidget.cpp Example File</h1>
<span class="subtitle">draganddrop/fridgemagnets/dragwidget.cpp</span>
<!-- $$$draganddrop/fridgemagnets/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:
  **
  ** &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;draglabel.h&quot;</span>
  <span class="preprocessor">#include &quot;dragwidget.h&quot;</span>

  <span class="preprocessor">#include &lt;QtWidgets&gt;</span>

  <span class="keyword">static</span> <span class="keyword">inline</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> fridgetMagnetsMimeType() { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">&quot;application/x-fridgemagnet&quot;</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="qwidget.html">QWidget</a></span>(parent)
  {
      <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> dictionaryFile(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">&quot;:/dictionary/words.txt&quot;</span>));
      dictionaryFile<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>ReadOnly);
      <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> inputStream(<span class="operator">&amp;</span>dictionaryFile);

      <span class="type">int</span> x <span class="operator">=</span> <span class="number">5</span>;
      <span class="type">int</span> y <span class="operator">=</span> <span class="number">5</span>;

      <span class="keyword">while</span> (<span class="operator">!</span>inputStream<span class="operator">.</span>atEnd()) {
          <span class="type"><a href="../qtcore/qstring.html">QString</a></span> word;
          inputStream <span class="operator">&gt;</span><span class="operator">&gt;</span> word;
          <span class="keyword">if</span> (<span class="operator">!</span>word<span class="operator">.</span>isEmpty()) {
              DragLabel <span class="operator">*</span>wordLabel <span class="operator">=</span> <span class="keyword">new</span> DragLabel(word<span class="operator">,</span> <span class="keyword">this</span>);
              wordLabel<span class="operator">-</span><span class="operator">&gt;</span>move(x<span class="operator">,</span> y);
              wordLabel<span class="operator">-</span><span class="operator">&gt;</span>show();
              wordLabel<span class="operator">-</span><span class="operator">&gt;</span>setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose);
              x <span class="operator">+</span><span class="operator">=</span> wordLabel<span class="operator">-</span><span class="operator">&gt;</span>width() <span class="operator">+</span> <span class="number">2</span>;
              <span class="keyword">if</span> (x <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">245</span>) {
                  x <span class="operator">=</span> <span class="number">5</span>;
                  y <span class="operator">+</span><span class="operator">=</span> wordLabel<span class="operator">-</span><span class="operator">&gt;</span>height() <span class="operator">+</span> <span class="number">2</span>;
              }
          }
      }

      <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span> newPalette <span class="operator">=</span> palette();
      newPalette<span class="operator">.</span>setColor(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Window<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white);
      setPalette(newPalette);

      setMinimumSize(<span class="number">400</span><span class="operator">,</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(<span class="number">200</span><span class="operator">,</span> y));
      setWindowTitle(tr(<span class="string">&quot;Fridge Magnets&quot;</span>));
      setAcceptDrops(<span class="keyword">true</span>);
  }

  <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">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>hasFormat(fridgetMagnetsMimeType())) {
          <span class="keyword">if</span> (children()<span class="operator">.</span>contains(event<span class="operator">-</span><span class="operator">&gt;</span>source())) {
              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>acceptProposedAction();
          }
      } <span class="keyword">else</span> <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>hasText()) {
          event<span class="operator">-</span><span class="operator">&gt;</span>acceptProposedAction();
      } <span class="keyword">else</span> {
          event<span class="operator">-</span><span class="operator">&gt;</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">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>hasFormat(fridgetMagnetsMimeType())) {
          <span class="keyword">if</span> (children()<span class="operator">.</span>contains(event<span class="operator">-</span><span class="operator">&gt;</span>source())) {
              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>acceptProposedAction();
          }
      } <span class="keyword">else</span> <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>hasText()) {
          event<span class="operator">-</span><span class="operator">&gt;</span>acceptProposedAction();
      } <span class="keyword">else</span> {
          event<span class="operator">-</span><span class="operator">&gt;</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">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>hasFormat(fridgetMagnetsMimeType())) {
          <span class="keyword">const</span> <span class="type"><a href="../qtcore/qmimedata.html">QMimeData</a></span> <span class="operator">*</span>mime <span class="operator">=</span> event<span class="operator">-</span><span class="operator">&gt;</span>mimeData();
          <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> itemData <span class="operator">=</span> mime<span class="operator">-</span><span class="operator">&gt;</span>data(fridgetMagnetsMimeType());
          <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>ReadOnly);

          <span class="type"><a href="../qtcore/qstring.html">QString</a></span> text;
          <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> offset;
          dataStream <span class="operator">&gt;</span><span class="operator">&gt;</span> text <span class="operator">&gt;</span><span class="operator">&gt;</span> offset;
          DragLabel <span class="operator">*</span>newLabel <span class="operator">=</span> <span class="keyword">new</span> DragLabel(text<span class="operator">,</span> <span class="keyword">this</span>);
          newLabel<span class="operator">-</span><span class="operator">&gt;</span>move(event<span class="operator">-</span><span class="operator">&gt;</span>pos() <span class="operator">-</span> offset);
          newLabel<span class="operator">-</span><span class="operator">&gt;</span>show();
          newLabel<span class="operator">-</span><span class="operator">&gt;</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">&gt;</span>source() <span class="operator">=</span><span class="operator">=</span> <span class="keyword">this</span>) {
              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>acceptProposedAction();
          }
      } <span class="keyword">else</span> <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>hasText()) {
          <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> pieces <span class="operator">=</span> event<span class="operator">-</span><span class="operator">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>split(<span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span>(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">&quot;\\s+&quot;</span>))<span class="operator">,</span>
                               <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>SkipEmptyParts);
          <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> position <span class="operator">=</span> event<span class="operator">-</span><span class="operator">&gt;</span>pos();

          foreach (<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>piece<span class="operator">,</span> pieces) {
              DragLabel <span class="operator">*</span>newLabel <span class="operator">=</span> <span class="keyword">new</span> DragLabel(piece<span class="operator">,</span> <span class="keyword">this</span>);
              newLabel<span class="operator">-</span><span class="operator">&gt;</span>move(position);
              newLabel<span class="operator">-</span><span class="operator">&gt;</span>show();
              newLabel<span class="operator">-</span><span class="operator">&gt;</span>setAttribute(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WA_DeleteOnClose);

              position <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(newLabel<span class="operator">-</span><span class="operator">&gt;</span>width()<span class="operator">,</span> <span class="number">0</span>);
          }

          event<span class="operator">-</span><span class="operator">&gt;</span>acceptProposedAction();
      } <span class="keyword">else</span> {
          event<span class="operator">-</span><span class="operator">&gt;</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)
  {
      DragLabel <span class="operator">*</span>child <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span>DragLabel<span class="operator">*</span><span class="operator">&gt;</span>(childAt(event<span class="operator">-</span><span class="operator">&gt;</span>pos()));
      <span class="keyword">if</span> (<span class="operator">!</span>child)
          <span class="keyword">return</span>;

      <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span> hotSpot <span class="operator">=</span> event<span class="operator">-</span><span class="operator">&gt;</span>pos() <span class="operator">-</span> child<span class="operator">-</span><span class="operator">&gt;</span>pos();

      <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> child<span class="operator">-</span><span class="operator">&gt;</span>labelText() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(hotSpot);

      <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(fridgetMagnetsMimeType()<span class="operator">,</span> itemData);
      mimeData<span class="operator">-</span><span class="operator">&gt;</span>setText(child<span class="operator">-</span><span class="operator">&gt;</span>labelText());

      <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>setPixmap(<span class="operator">*</span>child<span class="operator">-</span><span class="operator">&gt;</span>pixmap());
      drag<span class="operator">-</span><span class="operator">&gt;</span>setHotSpot(hotSpot);

      child<span class="operator">-</span><span class="operator">&gt;</span>hide();

      <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="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>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">&gt;</span>close();
      <span class="keyword">else</span>
          child<span class="operator">-</span><span class="operator">&gt;</span>show();
  }

</pre>
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<!-- @@@draganddrop/fridgemagnets/dragwidget.cpp -->
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