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<h1 class="title">Event Transitions Example</h1>
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<!-- $$$statemachine/eventtransitions-description -->
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<p>Files:</p>
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<li><a href="statemachine-eventtransitions-main-cpp.html">statemachine/eventtransitions/main.cpp</a></li>
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<li><a href="statemachine-eventtransitions-eventtransitions-pro.html">statemachine/eventtransitions/eventtransitions.pro</a></li>
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<p>The Event Transitions example shows how to use event transitions, a feature of <a href="statemachine-api.html">The State Machine Framework</a>.<pre class="cpp"> <span class="keyword">class</span> Window : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span>
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{
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<span class="keyword">public</span>:
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Window(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>)
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: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
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{
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<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(<span class="keyword">this</span>);
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button<span class="operator">-</span><span class="operator">></span>setSizePolicy(<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Expanding<span class="operator">,</span> <span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span><span class="operator">::</span>Expanding);
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<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
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layout<span class="operator">-</span><span class="operator">></span>addWidget(button);
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layout<span class="operator">-</span><span class="operator">></span>setContentsMargins(<span class="number">80</span><span class="operator">,</span> <span class="number">80</span><span class="operator">,</span> <span class="number">80</span><span class="operator">,</span> <span class="number">80</span>);
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setLayout(layout);</pre>
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<p>The <tt>Window</tt> class's constructors begins by creating a button.</p>
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<pre class="cpp"> <span class="type"><a href="qstatemachine.html">QStateMachine</a></span> <span class="operator">*</span>machine <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qstatemachine.html">QStateMachine</a></span>(<span class="keyword">this</span>);
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<span class="type"><a href="qstate.html">QState</a></span> <span class="operator">*</span>s1 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qstate.html">QState</a></span>();
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s1<span class="operator">-</span><span class="operator">></span>assignProperty(button<span class="operator">,</span> <span class="string">"text"</span><span class="operator">,</span> <span class="string">"Outside"</span>);
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<span class="type"><a href="qstate.html">QState</a></span> <span class="operator">*</span>s2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qstate.html">QState</a></span>();
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s2<span class="operator">-</span><span class="operator">></span>assignProperty(button<span class="operator">,</span> <span class="string">"text"</span><span class="operator">,</span> <span class="string">"Inside"</span>);</pre>
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<p>Two states, <tt>s1</tt> and <tt>s2</tt>, are created; upon entry they will assign "Outside" and "Inside" to the button's text, respectively.</p>
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<pre class="cpp"> <span class="type"><a href="qeventtransition.html">QEventTransition</a></span> <span class="operator">*</span>enterTransition <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qeventtransition.html">QEventTransition</a></span>(button<span class="operator">,</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>Enter);
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enterTransition<span class="operator">-</span><span class="operator">></span>setTargetState(s2);
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s1<span class="operator">-</span><span class="operator">></span>addTransition(enterTransition);</pre>
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<p>When the button receives an event of type <a href="qevent.html#Type-enum">QEvent::Enter</a> and the state machine is in state <tt>s1</tt>, the machine will transition to state <tt>s2</tt>.</p>
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<pre class="cpp"> <span class="type"><a href="qeventtransition.html">QEventTransition</a></span> <span class="operator">*</span>leaveTransition <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qeventtransition.html">QEventTransition</a></span>(button<span class="operator">,</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>Leave);
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leaveTransition<span class="operator">-</span><span class="operator">></span>setTargetState(s1);
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s2<span class="operator">-</span><span class="operator">></span>addTransition(leaveTransition);</pre>
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<p>When the button receives an event of type <a href="qevent.html#Type-enum">QEvent::Leave</a> and the state machine is in state <tt>s2</tt>, the machine will transition back to state <tt>s1</tt>.</p>
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<pre class="cpp"> <span class="type"><a href="qstate.html">QState</a></span> <span class="operator">*</span>s3 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qstate.html">QState</a></span>();
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s3<span class="operator">-</span><span class="operator">></span>assignProperty(button<span class="operator">,</span> <span class="string">"text"</span><span class="operator">,</span> <span class="string">"Pressing..."</span>);
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<span class="type"><a href="qeventtransition.html">QEventTransition</a></span> <span class="operator">*</span>pressTransition <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qeventtransition.html">QEventTransition</a></span>(button<span class="operator">,</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonPress);
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pressTransition<span class="operator">-</span><span class="operator">></span>setTargetState(s3);
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s2<span class="operator">-</span><span class="operator">></span>addTransition(pressTransition);
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<span class="type"><a href="qeventtransition.html">QEventTransition</a></span> <span class="operator">*</span>releaseTransition <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qeventtransition.html">QEventTransition</a></span>(button<span class="operator">,</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonRelease);
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releaseTransition<span class="operator">-</span><span class="operator">></span>setTargetState(s2);
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s3<span class="operator">-</span><span class="operator">></span>addTransition(releaseTransition);</pre>
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<p>Next, the state <tt>s3</tt> is created. <tt>s3</tt> will be entered when the button receives an event of type <a href="qevent.html#Type-enum">QEvent::MouseButtonPress</a> and the state machine is in state <tt>s2</tt>. When the button receives an event of type <a href="qevent.html#Type-enum">QEvent::MouseButtonRelease</a> and the state machine is in state <tt>s3</tt>, the machine will transition back to state <tt>s2</tt>.</p>
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<pre class="cpp"> machine<span class="operator">-</span><span class="operator">></span>addState(s1);
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machine<span class="operator">-</span><span class="operator">></span>addState(s2);
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machine<span class="operator">-</span><span class="operator">></span>addState(s3);
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machine<span class="operator">-</span><span class="operator">></span>setInitialState(s1);
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machine<span class="operator">-</span><span class="operator">></span>start();
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}
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};</pre>
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<p>Finally, the states are added to the machine as top-level states, the initial state is set to be <tt>s1</tt> ("Outside"), and the machine is started.</p>
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<pre class="cpp"> <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv)
|
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{
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<span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
|
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Window window;
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window<span class="operator">.</span>resize(<span class="number">300</span><span class="operator">,</span> <span class="number">300</span>);
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<span class="preprocessor">#if defined(Q_OS_SYMBIAN)</span>
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window<span class="operator">.</span>showMaximized();
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<span class="preprocessor">#else</span>
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window<span class="operator">.</span>show();
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<span class="preprocessor">#endif</span>
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<span class="keyword">return</span> app<span class="operator">.</span>exec();
|
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}</pre>
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<p>The main() function constructs a Window object and shows it.</p>
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</div>
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<!-- @@@statemachine/eventtransitions -->
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<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
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Documentation contributions included herein are the copyrights of
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The documentation provided herein is licensed under the terms of the
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License version 1.3</a> as published by the Free Software Foundation.</p>
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