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<td >Qt 5.9</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td >Two-way Button Example</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">Two-way Button Example</h1>
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<div class="descr"> <a name="details"></a>
<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)
{
<span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> button;
<span class="type"><a href="../qtcore/qstatemachine.html">QStateMachine</a></span> machine;
</pre>
<p>The application's main() function begins by constructing the application object, a button and a state machine.</p>
<pre class="cpp">
<span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>off <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qstate.html">QState</a></span>();
off<span class="operator">-</span><span class="operator">></span>assignProperty(<span class="operator">&</span>button<span class="operator">,</span> <span class="string">"text"</span><span class="operator">,</span> <span class="string">"Off"</span>);
off<span class="operator">-</span><span class="operator">></span>setObjectName(<span class="string">"off"</span>);
<span class="type"><a href="../qtcore/qstate.html">QState</a></span> <span class="operator">*</span>on <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qstate.html">QState</a></span>();
on<span class="operator">-</span><span class="operator">></span>setObjectName(<span class="string">"on"</span>);
on<span class="operator">-</span><span class="operator">></span>assignProperty(<span class="operator">&</span>button<span class="operator">,</span> <span class="string">"text"</span><span class="operator">,</span> <span class="string">"On"</span>);
</pre>
<p>The state machine has two states; <code>on</code> and <code>off</code>. When either state is entered, the text of the button will be set accordingly.</p>
<pre class="cpp">
off<span class="operator">-</span><span class="operator">></span>addTransition(<span class="operator">&</span>button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> on);
on<span class="operator">-</span><span class="operator">></span>addTransition(<span class="operator">&</span>button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> off);
</pre>
<p>When the state machine is in the <code>off</code> state and the button is clicked, it will transition to the <code>on</code> state; when the state machine is in the <code>on</code> state and the button is clicked, it will transition to the <code>off</code> state.</p>
<pre class="cpp">
machine<span class="operator">.</span>addState(off);
machine<span class="operator">.</span>addState(on);
</pre>
<p>The states are added to the state machine; they become top-level (sibling) states.</p>
<pre class="cpp">
machine<span class="operator">.</span>setInitialState(off);
machine<span class="operator">.</span>start();
</pre>
<p>The initial state is <code>off</code>; this is the state the state machine will immediately transition to once the state machine is started.</p>
<pre class="cpp">
button<span class="operator">.</span>resize(<span class="number">100</span><span class="operator">,</span> <span class="number">50</span>);
button<span class="operator">.</span>show();
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}
</pre>
<p>Finally, the button is resized and made visible, and the application event loop is entered.</p>
<p>Files:</p>
<ul>
<li><a href="qtwidgets-statemachine-twowaybutton-main-cpp.html">statemachine/twowaybutton/main.cpp</a></li>
<li><a href="qtwidgets-statemachine-twowaybutton-twowaybutton-pro.html">statemachine/twowaybutton/twowaybutton.pro</a></li>
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