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<title>Qt 4.6: Two-way Button Example</title>
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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">Two-way Button Example<br /><span class="subtitle"></span>
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<p>Files:</p>
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<li><a href="statemachine-twowaybutton-main-cpp.html">statemachine/twowaybutton/main.cpp</a></li>
<li><a href="statemachine-twowaybutton-twowaybutton-pro.html">statemachine/twowaybutton/twowaybutton.pro</a></li>
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<p>The Two-way button example shows how to use <a href="statemachine-api.html">The State Machine Framework</a> to implement a simple state machine that toggles the current state when a button is clicked.</p>
<pre> int main(int argc, char **argv)
{
QApplication app(argc, argv);
QPushButton button;
QStateMachine machine;</pre>
<p>The application's main() function begins by constructing the application object, a button and a state machine.</p>
<pre> QState *off = new QState();
off->assignProperty(&button, "text", "Off");
off->setObjectName("off");
QState *on = new QState();
on->setObjectName("on");
on->assignProperty(&button, "text", "On");</pre>
<p>The state machine has two states; <tt>on</tt> and <tt>off</tt>. When either state is entered, the text of the button will be set accordingly.</p>
<pre> off->addTransition(&button, SIGNAL(clicked()), on);
on->addTransition(&button, SIGNAL(clicked()), off);</pre>
<p>When the state machine is in the <tt>off</tt> state and the button is clicked, it will transition to the <tt>on</tt> state; when the state machine is in the <tt>on</tt> state and the button is clicked, it will transition to the <tt>off</tt> state.</p>
<pre> machine.addState(off);
machine.addState(on);</pre>
<p>The states are added to the state machine; they become top-level (sibling) states.</p>
<pre> machine.setInitialState(off);
machine.start();</pre>
<p>The initial state is <tt>off</tt>; this is the state the state machine will immediately transition to once the state machine is started.</p>
<pre> button.resize(100, 50);
button.show();
return app.exec();
}</pre>
<p>Finally, the button is resized and made visible, and the application event loop is entered.</p>
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