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POFlex equivalent of ProcessMessages and unresponsive UI during long loops
 

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    <p>I find that my Flex application's UI becomes unresponsive during very long processing loops (tens of seconds). For example, while processing very large XML files and doing something per-element...</p> <p>Is there an equivalent of "ProcessMessages"? That is, a call that would tell Flex to continue responding to UI events, even in the middle of some long loop, so that the UI doesn't become unresponsive?</p> <p><strong>I'm aware Flex is single threaded by design</strong>. That's exactly why I'm looking for something like ProcessMessages() - a function that allows <strong>single-threaded reentrant</strong> applications (like in VB, or single-threaded message loop based C++ applications) to remain responsive during long operations. </p> <p><strong>Summary of Answers</strong></p> <ol> <li>There's no built-in function like <code>HandleEvents()</code> or <code>ProcessMessages()</code> in Flex.</li> <li>Using some sort of callback mechanism to iteratively process chunks of a long computation process, while yielding to the runtime between chunks, thus enabling it to be responsive, is the only way to maintain a responsive UI during long computations.</li> <li>Ways of accomplishing the above are: <ol> <li>Using the <code>enterFrame</code> event, which is called whenever the Flash "movie" layer below the Flex application refreshes its frame (which is something like 20fps).</li> <li>Using a timer.</li> <li>Using <code>UIComponent.callLater()</code> which schedules work to be done "later". (as the docs <a href="http://livedocs.adobe.com/flex/3/langref/mx/core/UIComponent.html#callLater()" rel="noreferrer">say</a>: <code>Queues a function to be called later. Before each update of the screen, Flash Player or AIR calls the set of functions that are scheduled for the update.</code></li> <li>Using intentionally triggered mouse/keyboard events to create pseudo "worker threads", as in <a href="http://blogs.adobe.com/aharui/2008/01/threads_in_actionscript_3.html" rel="noreferrer">this example</a>.</li> </ol></li> </ol> <p>If there are further suggestions, or if I left out anything, please feel free to edit this (now) wiki piece.</p>
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