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crystalspace-doc-1.2.1-5mdv2010.0.i586.rpm

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<title>Crystal Space 1.2.1: 4.2.1.2 Event Handling</title>

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<a name="Simple-Event-Handling"></a>
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<h4 class="subsubsection"> 4.2.1.2 Event Handling </h4>

<p>To make the testing somewhat easier we will add a way to terminate the
application by responding to the <kbd>ESC</kbd> key.  Add the following private
method to our class in <tt>&lsquo;simple.h&rsquo;</tt>:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">bool OnKeyboard (iEvent&amp;);
</pre></td></tr></table>
<p>The function <code>OnKeyboard()</code> will be called when an event arrives
Add the following code to <tt>&lsquo;simple.cpp&rsquo;</tt> just before
<code>Simple::OnInitialize()</code>:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">bool Simple::OnKeyboard(iEvent&amp; ev)
{
  csKeyEventType eventtype = csKeyEventHelper::GetEventType(&amp;ev);
  if (eventtype == csKeyEventTypeDown)
  {
    utf32_char code = csKeyEventHelper::GetCookedCode(&amp;ev);
    if (code == CSKEY_ESC)
    {
      csRef&lt;iEventQueue&gt; q =
        csQueryRegistry&lt;iEventQueue&gt; (GetObjectRegistry());
      if (q.IsValid()) q-&gt;GetEventOutlet()-&gt;Broadcast(csevQuit (
      	GetObjectRegistry ()));
    }
  }
  return false;
}
</pre></td></tr></table>
<p><code>OnKeyboard()</code> checks if the <kbd>ESC</kbd> key has been pressed. If so it
uses the object registry to find the global event queue object. Using
<code>Broadcast()</code> it then broadcasts the <samp>&lsquo;csevQuit&rsquo;</samp> message
to all interested parties. This will cause the application to quit by
terminating the run-loop.
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