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<h1 class="title">qanimationstate.cpp Example File</h1>
<span class="subtitle">animation/sub-attaq/qanimationstate.cpp</span>
<!-- $$$animation/sub-attaq/qanimationstate.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 QtGui module 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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  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

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

  <span class="preprocessor">#include &lt;QtCore/qstate.h&gt;</span>

  <span class="comment">/*!
  \class QAnimationState

  \brief The QAnimationState class provides state that handle an animation and emit
  a signal when this animation is finished.

  \ingroup statemachine

  QAnimationState provides a state that handle an animation. It will start this animation
  when the state is entered and stop it when it is leaved. When the animation has finished the
  state emit animationFinished signal.
  QAnimationState is part of \l{The State Machine Framework}.

  \code
  QStateMachine machine;
  QAnimationState *s = new QAnimationState(machine-&gt;rootState());
  QPropertyAnimation *animation = new QPropertyAnimation(obj, &quot;pos&quot;);
  s-&gt;setAnimation(animation);
  QState *s2 = new QState(machine-&gt;rootState());
  s-&gt;addTransition(s, SIGNAL(animationFinished()), s2);
  machine.start();
  \endcode

  \sa QState, {The Animation Framework}
  */</span>

  <span class="comment">/*!
    Constructs a new state with the given \a parent state.
  */</span>
  <span class="type">QAnimationState</span><span class="operator">::</span><span class="type">QAnimationState</span>(<span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="../qtcore/qstate.html">QState</a></span>(parent)<span class="operator">,</span> m_animation(<span class="number">0</span>)
  {
  }

  <span class="comment">/*!
    Destroys the animation state.
  */</span>
  <span class="type">QAnimationState</span><span class="operator">::</span><span class="operator">~</span><span class="type">QAnimationState</span>()
  {
  }

  <span class="comment">/*!
    Set an \a animation for this QAnimationState. If an animation was previously handle by this
    state then it won't emit animationFinished for the old animation. The QAnimationState doesn't
    take the ownership of the animation.
  */</span>
  <span class="type">void</span> <span class="type">QAnimationState</span><span class="operator">::</span>setAnimation(<span class="type"><a href="../qtcore/qabstractanimation.html">QAbstractAnimation</a></span> <span class="operator">*</span>animation)
  {
      <span class="keyword">if</span> (animation <span class="operator">=</span><span class="operator">=</span> m_animation)
          <span class="keyword">return</span>;

      <span class="comment">//Disconnect from the previous animation if exist</span>
      <span class="keyword">if</span>(m_animation)
          disconnect(m_animation<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(animationFinished()));

      m_animation <span class="operator">=</span> animation;

      <span class="keyword">if</span> (m_animation) {
          <span class="comment">//connect the new animation</span>
          connect(m_animation<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(animationFinished()));
      }
  }

  <span class="comment">/*!
    Returns the animation handle by this animation state, or 0 if there is no animation.
  */</span>
  <span class="type"><a href="../qtcore/qabstractanimation.html">QAbstractAnimation</a></span><span class="operator">*</span> <span class="type">QAnimationState</span><span class="operator">::</span>animation() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_animation;
  }

  <span class="comment">/*!
    \reimp
  */</span>
  <span class="type">void</span> <span class="type">QAnimationState</span><span class="operator">::</span>onEntry(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>)
  {
      <span class="keyword">if</span> (m_animation)
          m_animation<span class="operator">-</span><span class="operator">&gt;</span>start();
  }

  <span class="comment">/*!
    \reimp
  */</span>
  <span class="type">void</span> <span class="type">QAnimationState</span><span class="operator">::</span>onExit(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>)
  {
      <span class="keyword">if</span> (m_animation)
          m_animation<span class="operator">-</span><span class="operator">&gt;</span>stop();
  }

  <span class="comment">/*!
    \reimp
  */</span>
  bool <span class="type">QAnimationState</span><span class="operator">::</span>event(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>e)
  {
      <span class="keyword">return</span> <span class="type"><a href="../qtcore/qstate.html">QState</a></span><span class="operator">::</span>event(e);
  }

</pre>
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<!-- @@@animation/sub-attaq/qanimationstate.cpp -->
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