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POAS3 KeyboardEvents not firing until after I've clicked on an onscreen button
 

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  1. POAS3 KeyboardEvents not firing until after I've clicked on an onscreen button
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    <p>So here's my setup:</p> <p>My document class is Main.as (it extends MovieClip). The following code is in my Main.as.</p> <p>I've declared all these variables in my class definition:</p> <pre><code>private var holder:MovieClip; private var leftButton:SimpleButton; private var rightButton:SimpleButton; </code></pre> <p>in constructor...</p> <pre><code>holder = new MovieClip(); addChild(holder); holder.addEventListener(KeyboardEvent.KEY_UP, handleKeyboardEvent); leftButton = new Arrow(); rightButton = new Arrow(); holder.addChild(leftButton); holder.addChild(rightButton); leftButton.x = 50; leftButton.rotation = 180; rightButton.x = 150; leftButton.y = rightButton.y = 50; leftButton.addEventListener(MouseEvent.CLICK, handlePaging); rightButton.addEventListener(MouseEvent.CLICK, handlePaging); </code></pre> <p>...outside of constructor...</p> <pre><code>public function handleKeyboardEvent ( e:KeyboardEvent ) { trace("got a keyboard event"); trace("e.charCode : " + e.charCode); trace("e.keyCode : " + e.keyCode); switch (e.keyCode) { case 37: //left arrow showPreviousMoment(); break; case 39: //right arrow showNextMoment(); break; } } </code></pre> <p>The two buttons are instances of an Arrow movieclip that I have in the library. The Arrow movie clip just has graphics in it (in the property dialog for it the base class is flash.display.SimpleButton).</p> <p>I want the user to be able to press the onscreen arrows OR the keyboard arrow keys to page forwards and backwards.</p> <p>So...when I test the movie or publish it as an app, pressing the left and right keyboard keys doesn't do anything. HOWEVER...AFTER I click on the screen arrows THEN the keyboard events are getting picked up!!! How come my keyboard events are not getting received initially? Why does clicking on the onscreen buttons make the 'holder' start receiving the events? </p> <p><strong>UPDATE</strong></p> <p>I've also just commented out all of my code EXCEPT for the instantiating the 'holder' and adding the listener. The KeyboardEvents are not being heard by the holder.</p> <p><strong>UPDATE...ANSWER</strong></p> <p>So I found out that if I want to globally hear the KeyboardEvent, I should register stage as the listener. So this did the trick:</p> <pre><code>stage.addEventListener(KeyboardEvent.KEY_UP, handleKeyboardEvent); </code></pre> <p>Info from Colin Moock's book:</p> <blockquote> <p>Keyboard-input events that trigger application-wide commands are typically handled globally, by listeners registered with Flash Player's Stage instance. By contrast, keyboard-input events that trigger a specific interface-element response are typically handled by listeners registered with the object that currently has keyboard focus.</p> </blockquote> <p>So I guess that in my initial version, when I clicked on the onscreen arrow button, I somehow gave keyboard focus to the 'holder;.</p>
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    1. COAre you sure it is the clicking the arrows that makes the keyboard events work and not just clicking anything in the flash movie? 'Cause it sounds like you need to have the flash window in focus for the keyboard events to work. Try clicking on something else in the flash movie (not the arrows) and then test clicking your keyboard arrows, if this works it means there is nothing wrong with your code and everything works like it is supposed to.
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      1. USSimplyZ
    2. COI forgot to mention that it is not a focus issue. I've clicked on different parts of the movie window and that wouldn't 'activate' the keys. It's only AFTER I click on the onscreen buttons...then the keys are active.
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    3. COCould you add the handlePaging function to the question? maybe it is something in there that activates the keyboard events. (just a wild guess)
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