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<h1 class="title">customproxy.cpp Example File</h1>
<span class="subtitle">graphicsview/embeddeddialogs/customproxy.cpp</span>
<!-- $$$graphicsview/embeddeddialogs/customproxy.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 demonstration applications 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
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  **   * 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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  ** 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,
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  ** 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;customproxy.h&quot;</span>

  <span class="preprocessor">#include &lt;QStyleOptionGraphicsItem&gt;</span>
  <span class="preprocessor">#include &lt;QPainter&gt;</span>
  <span class="preprocessor">#include &lt;QGraphicsScene&gt;</span>

  CustomProxy<span class="operator">::</span>CustomProxy(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>parent<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WindowFlags wFlags)
      : <span class="type"><a href="qgraphicsproxywidget.html">QGraphicsProxyWidget</a></span>(parent<span class="operator">,</span> wFlags)<span class="operator">,</span> popupShown(<span class="keyword">false</span>)<span class="operator">,</span> currentPopup(<span class="number">0</span>)
  {
      timeLine <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span>(<span class="number">250</span><span class="operator">,</span> <span class="keyword">this</span>);
      connect(timeLine<span class="operator">,</span> SIGNAL(valueChanged(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(updateStep(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span>)));
      connect(timeLine<span class="operator">,</span> SIGNAL(stateChanged(<span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>State))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(stateChanged(<span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>State)));
  }

  <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> CustomProxy<span class="operator">::</span>boundingRect() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> <span class="type"><a href="qgraphicsproxywidget.html">QGraphicsProxyWidget</a></span><span class="operator">::</span>boundingRect()<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="number">10</span><span class="operator">,</span> <span class="number">10</span>);
  }

  <span class="type">void</span> CustomProxy<span class="operator">::</span>paintWindowFrame(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstyleoptiongraphicsitem.html">QStyleOptionGraphicsItem</a></span> <span class="operator">*</span>option<span class="operator">,</span>
                                     <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>widget)
  {
      <span class="keyword">const</span> <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> color(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">64</span>);

      <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> r <span class="operator">=</span> windowFrameRect();
      <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> right(r<span class="operator">.</span>right()<span class="operator">,</span> r<span class="operator">.</span>top() <span class="operator">+</span> <span class="number">10</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> r<span class="operator">.</span>height() <span class="operator">-</span> <span class="number">10</span>);
      <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> bottom(r<span class="operator">.</span>left() <span class="operator">+</span> <span class="number">10</span><span class="operator">,</span> r<span class="operator">.</span>bottom()<span class="operator">,</span> r<span class="operator">.</span>width()<span class="operator">,</span> <span class="number">10</span>);
      bool intersectsRight <span class="operator">=</span> right<span class="operator">.</span>intersects(option<span class="operator">-</span><span class="operator">&gt;</span>exposedRect);
      bool intersectsBottom <span class="operator">=</span> bottom<span class="operator">.</span>intersects(option<span class="operator">-</span><span class="operator">&gt;</span>exposedRect);
      <span class="keyword">if</span> (intersectsRight <span class="operator">&amp;</span><span class="operator">&amp;</span> intersectsBottom) {
          <span class="type"><a href="../qtgui/qpainterpath.html">QPainterPath</a></span> path;
          path<span class="operator">.</span>addRect(right);
          path<span class="operator">.</span>addRect(bottom);
          painter<span class="operator">-</span><span class="operator">&gt;</span>setPen(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoPen);
          painter<span class="operator">-</span><span class="operator">&gt;</span>setBrush(color);
          painter<span class="operator">-</span><span class="operator">&gt;</span>drawPath(path);
      } <span class="keyword">else</span> <span class="keyword">if</span> (intersectsBottom) {
          painter<span class="operator">-</span><span class="operator">&gt;</span>fillRect(bottom<span class="operator">,</span> color);
      } <span class="keyword">else</span> <span class="keyword">if</span> (intersectsRight) {
          painter<span class="operator">-</span><span class="operator">&gt;</span>fillRect(right<span class="operator">,</span> color);
      }

      <span class="type"><a href="qgraphicsproxywidget.html">QGraphicsProxyWidget</a></span><span class="operator">::</span>paintWindowFrame(painter<span class="operator">,</span> option<span class="operator">,</span> widget);
  }

  <span class="type">void</span> CustomProxy<span class="operator">::</span>hoverEnterEvent(<span class="type"><a href="qgraphicsscenehoverevent.html">QGraphicsSceneHoverEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type"><a href="qgraphicsproxywidget.html">QGraphicsProxyWidget</a></span><span class="operator">::</span>hoverEnterEvent(event);
      scene()<span class="operator">-</span><span class="operator">&gt;</span>setActiveWindow(<span class="keyword">this</span>);
      <span class="keyword">if</span> (timeLine<span class="operator">-</span><span class="operator">&gt;</span>currentValue() <span class="operator">!</span><span class="operator">=</span> <span class="number">1</span>)
          zoomIn();
  }

  <span class="type">void</span> CustomProxy<span class="operator">::</span>hoverLeaveEvent(<span class="type"><a href="qgraphicsscenehoverevent.html">QGraphicsSceneHoverEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type"><a href="qgraphicsproxywidget.html">QGraphicsProxyWidget</a></span><span class="operator">::</span>hoverLeaveEvent(event);
      <span class="keyword">if</span> (<span class="operator">!</span>popupShown
              <span class="operator">&amp;</span><span class="operator">&amp;</span> (timeLine<span class="operator">-</span><span class="operator">&gt;</span>direction() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Backward <span class="operator">|</span><span class="operator">|</span> timeLine<span class="operator">-</span><span class="operator">&gt;</span>currentValue() <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>)) {
          zoomOut();
      }
  }

  bool CustomProxy<span class="operator">::</span>sceneEventFilter(<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>watched<span class="operator">,</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="keyword">if</span> (watched<span class="operator">-</span><span class="operator">&gt;</span>isWindow()
              <span class="operator">&amp;</span><span class="operator">&amp;</span> (event<span class="operator">-</span><span class="operator">&gt;</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>UngrabMouse <span class="operator">|</span><span class="operator">|</span> event<span class="operator">-</span><span class="operator">&gt;</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>GrabMouse)) {
          popupShown <span class="operator">=</span> watched<span class="operator">-</span><span class="operator">&gt;</span>isVisible();
          <span class="keyword">if</span> (<span class="operator">!</span>popupShown <span class="operator">&amp;</span><span class="operator">&amp;</span> <span class="operator">!</span>isUnderMouse())
              zoomOut();
      }
      <span class="keyword">return</span> <span class="type"><a href="qgraphicsproxywidget.html">QGraphicsProxyWidget</a></span><span class="operator">::</span>sceneEventFilter(watched<span class="operator">,</span> event);
  }

  <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> CustomProxy<span class="operator">::</span>itemChange(GraphicsItemChange change<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&amp;</span>value)
  {
      <span class="keyword">if</span> (change <span class="operator">=</span><span class="operator">=</span> ItemChildAddedChange <span class="operator">|</span><span class="operator">|</span> change <span class="operator">=</span><span class="operator">=</span> ItemChildRemovedChange) {
          <span class="keyword">if</span> (change <span class="operator">=</span><span class="operator">=</span> ItemChildAddedChange) {
              currentPopup <span class="operator">=</span> qvariant_cast<span class="operator">&lt;</span><span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span><span class="operator">&gt;</span>(value);
              currentPopup<span class="operator">-</span><span class="operator">&gt;</span>setCacheMode(ItemCoordinateCache);
              <span class="keyword">if</span> (scene())
                  currentPopup<span class="operator">-</span><span class="operator">&gt;</span>installSceneEventFilter(<span class="keyword">this</span>);
          } <span class="keyword">else</span> <span class="keyword">if</span> (scene()) {
              currentPopup<span class="operator">-</span><span class="operator">&gt;</span>removeSceneEventFilter(<span class="keyword">this</span>);
              currentPopup <span class="operator">=</span> <span class="number">0</span>;
          }
      } <span class="keyword">else</span> <span class="keyword">if</span> (currentPopup <span class="operator">&amp;</span><span class="operator">&amp;</span> change <span class="operator">=</span><span class="operator">=</span> ItemSceneHasChanged) {
          currentPopup<span class="operator">-</span><span class="operator">&gt;</span>installSceneEventFilter(<span class="keyword">this</span>);
      }
      <span class="keyword">return</span> <span class="type"><a href="qgraphicsproxywidget.html">QGraphicsProxyWidget</a></span><span class="operator">::</span>itemChange(change<span class="operator">,</span> value);
  }

  <span class="type">void</span> CustomProxy<span class="operator">::</span>updateStep(<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> step)
  {
      <span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span> r <span class="operator">=</span> boundingRect();
      setTransform(<span class="type"><a href="../qtgui/qtransform.html">QTransform</a></span>()
                   <span class="operator">.</span>translate(r<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> r<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span>)
                   <span class="operator">.</span>rotate(step <span class="operator">*</span> <span class="number">30</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>XAxis)
                   <span class="operator">.</span>rotate(step <span class="operator">*</span> <span class="number">10</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>YAxis)
                   <span class="operator">.</span>rotate(step <span class="operator">*</span> <span class="number">5</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ZAxis)
                   <span class="operator">.</span>scale(<span class="number">1</span> <span class="operator">+</span> <span class="number">1.5</span> <span class="operator">*</span> step<span class="operator">,</span> <span class="number">1</span> <span class="operator">+</span> <span class="number">1.5</span> <span class="operator">*</span> step)
                   <span class="operator">.</span>translate(<span class="operator">-</span>r<span class="operator">.</span>width() <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> <span class="operator">-</span>r<span class="operator">.</span>height() <span class="operator">/</span> <span class="number">2</span>));
  }

  <span class="type">void</span> CustomProxy<span class="operator">::</span>stateChanged(<span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>State state)
  {
      <span class="keyword">if</span> (state <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Running) {
          <span class="keyword">if</span> (timeLine<span class="operator">-</span><span class="operator">&gt;</span>direction() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Forward)
              setCacheMode(ItemCoordinateCache);
      } <span class="keyword">else</span> <span class="keyword">if</span> (state <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>NotRunning) {
          <span class="keyword">if</span> (timeLine<span class="operator">-</span><span class="operator">&gt;</span>direction() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Backward)
              setCacheMode(DeviceCoordinateCache);
      }
  }

  <span class="type">void</span> CustomProxy<span class="operator">::</span>zoomIn()
  {
      <span class="keyword">if</span> (timeLine<span class="operator">-</span><span class="operator">&gt;</span>direction() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Forward)
          timeLine<span class="operator">-</span><span class="operator">&gt;</span>setDirection(<span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Forward);
      <span class="keyword">if</span> (timeLine<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>NotRunning)
          timeLine<span class="operator">-</span><span class="operator">&gt;</span>start();
  }

  <span class="type">void</span> CustomProxy<span class="operator">::</span>zoomOut()
  {
      <span class="keyword">if</span> (timeLine<span class="operator">-</span><span class="operator">&gt;</span>direction() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Backward)
          timeLine<span class="operator">-</span><span class="operator">&gt;</span>setDirection(<span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>Backward);
      <span class="keyword">if</span> (timeLine<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qtimeline.html">QTimeLine</a></span><span class="operator">::</span>NotRunning)
          timeLine<span class="operator">-</span><span class="operator">&gt;</span>start();
  }

</pre>
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<!-- @@@graphicsview/embeddeddialogs/customproxy.cpp -->
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