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<h1 class="title">qcontext2dcanvas.cpp Example File</h1>
<span class="subtitle">script/context2d/qcontext2dcanvas.cpp</span>
<!-- $$$script/context2d/qcontext2dcanvas.cpp-description -->
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  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
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  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
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  ** information use the contact form at https://www.qt.io/contact-us.
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  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
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  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;qcontext2dcanvas.h&quot;</span>

  <span class="preprocessor">#include &quot;context2d.h&quot;</span>
  <span class="preprocessor">#include &quot;environment.h&quot;</span>
  <span class="preprocessor">#include &quot;domimage.h&quot;</span>

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

  QContext2DCanvas<span class="operator">::</span>QContext2DCanvas(Context2D <span class="operator">*</span>context<span class="operator">,</span> Environment <span class="operator">*</span>env<span class="operator">,</span> <span class="type">QWidget</span> <span class="operator">*</span>parent)
      : <span class="type">QWidget</span>(parent)<span class="operator">,</span> m_context(context)<span class="operator">,</span> m_env(env)
  {
      <span class="type">QObject</span><span class="operator">::</span>connect(context<span class="operator">,</span> SIGNAL(changed(<span class="type">QImage</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(contentsChanged(<span class="type">QImage</span>)));
      setMouseTracking(<span class="keyword">true</span>);
  }

  QContext2DCanvas<span class="operator">::</span><span class="operator">~</span>QContext2DCanvas()
  {
  }

  Context2D <span class="operator">*</span>QContext2DCanvas<span class="operator">::</span>context() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_context;
  }

  <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> QContext2DCanvas<span class="operator">::</span>getContext(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>str)
  {
      <span class="keyword">if</span> (str <span class="operator">!</span><span class="operator">=</span> <span class="string">&quot;2d&quot;</span>)
          <span class="keyword">return</span> <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span>();
      <span class="keyword">return</span> m_env<span class="operator">-</span><span class="operator">&gt;</span>toWrapper(m_context);
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>contentsChanged(<span class="keyword">const</span> <span class="type">QImage</span> <span class="operator">&amp;</span>image)
  {
      m_image <span class="operator">=</span> image;
      update();
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>paintEvent(<span class="type">QPaintEvent</span> <span class="operator">*</span>e)
  {
      <span class="type">QPainter</span> p(<span class="keyword">this</span>);
      p<span class="operator">.</span>setClipRect(e<span class="operator">-</span><span class="operator">&gt;</span>rect());
      p<span class="operator">.</span>drawImage(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> m_image);
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>mouseMoveEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>e)
  {
      m_env<span class="operator">-</span><span class="operator">&gt;</span>handleEvent(<span class="keyword">this</span><span class="operator">,</span> e);
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>mousePressEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>e)
  {
      m_env<span class="operator">-</span><span class="operator">&gt;</span>handleEvent(<span class="keyword">this</span><span class="operator">,</span> e);
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>mouseReleaseEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>e)
  {
      m_env<span class="operator">-</span><span class="operator">&gt;</span>handleEvent(<span class="keyword">this</span><span class="operator">,</span> e);
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>keyPressEvent(<span class="type">QKeyEvent</span> <span class="operator">*</span>e)
  {
      m_env<span class="operator">-</span><span class="operator">&gt;</span>handleEvent(<span class="keyword">this</span><span class="operator">,</span> e);
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>keyReleaseEvent(<span class="type">QKeyEvent</span> <span class="operator">*</span>e)
  {
      m_env<span class="operator">-</span><span class="operator">&gt;</span>handleEvent(<span class="keyword">this</span><span class="operator">,</span> e);
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>resizeEvent(<span class="type">QResizeEvent</span> <span class="operator">*</span>e)
  {
      m_context<span class="operator">-</span><span class="operator">&gt;</span>setSize(e<span class="operator">-</span><span class="operator">&gt;</span>size()<span class="operator">.</span>width()<span class="operator">,</span> e<span class="operator">-</span><span class="operator">&gt;</span>size()<span class="operator">.</span>height());
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>resize(<span class="type">int</span> width<span class="operator">,</span> <span class="type">int</span> height)
  {
      <span class="type">QWidget</span><span class="operator">::</span>resize(width<span class="operator">,</span> height);
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>reset()
  {
      m_context<span class="operator">-</span><span class="operator">&gt;</span>reset();
  }

  <span class="type">void</span> QContext2DCanvas<span class="operator">::</span>addEventListener(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>type<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> <span class="operator">&amp;</span>listener<span class="operator">,</span>
                                          bool useCapture)
  {
      Q_UNUSED(useCapture);
      <span class="keyword">if</span> (listener<span class="operator">.</span>isFunction()) {
          <span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> self <span class="operator">=</span> m_env<span class="operator">-</span><span class="operator">&gt;</span>toWrapper(<span class="keyword">this</span>);
          self<span class="operator">.</span>setProperty(<span class="string">&quot;on&quot;</span> <span class="operator">+</span> type<span class="operator">,</span> listener);
      }
  }

</pre>
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