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<h4 class="subsubsection"> 6.1.1.2 Run-Loop </h4>
<p>The typical Crystal Space application assumes that the programmer has full
control over the application's run-loop. For many platforms to which Crystal
Space has been ported, this is not a problem since the main run-loop is
generally implemented in this fashion:
</p>
<table><tr><td> </td><td><pre class="example">bool csDefaultRunLoop(iObjectRegistry*)
{
while (!shutdown)
event_queue->Process();
}
</pre></td></tr></table>
<p>With Cocoa, on the other hand, the main run-loop is not accessible to the
programmer and is essentially a black-box. A simple-minded implementation of
the above functionality for Cocoa might look like this:
</p>
<table><tr><td> </td><td><pre class="example">bool csDefaultRunLoop(iObjectRegistry*)
{
[NSApp run];
}
</pre></td></tr></table>
<p>This code launches the Cocoa run-loop but does not address the problem of
periodically processing Crystal Space's event queue. To solve this problem
<samp>‘OSXDelegate’</samp> artificially injects <em>application-defined</em> events into
the Cocoa event queue and then triggers an invocation of
<code>iEventQueue::Process()</code> for each such received event. A single
application-defined event is injected into the event queue in order to begin
the process, and then an event is injected into the queue after each invocation
of <code>iEventQueue::Process()</code>.
</p>
<p>Note that <code>csDefaultRunLoop()</code> is provided as a convenience for
applications which do not otherwise supply their own run-loop. Existing Cocoa
applications which already employ the <code>NSApplication</code>'s black-box run-loop
should not invoke <code>csDefaultRunLoop()</code>; but should instead arrange to have
<code>iEventQueue::Process()</code> invoked on a periodic basis via some other
mechanism.
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distrib
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Mandriva
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2010.0
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i586
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media
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contrib-release
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by-pkgid
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bad97183153701b09df5fae1052b1c30
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files
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