How to Fullscreen Flash File in Browser

Posted September 6th, 2010 by

Since the Flash Player 9,0,28,0 update, flash applets can go to true full-screen. There are no fancy javascript hacks needed either. Users can toggle between normal size and fullscreen with a simple click, which can toggle Stage["displayState"] from “normal” to “fullScreen”. The param allow FullScreen must be set to true in the applet html.

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<strong><param name="allowFullScreen" value="true" /></strong>

The first thing to do is create a button and add the following code to it:

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<ol><li class="li1"> <span class="kw3">on</span><span class="br0">(</span>press<span class="br0">)</span><span class="br0">{</span></li>
  <li class="li1">   toggleFullScreen<span class="br0">(</span><span class="br0">)</span>;</li>
  <li class="li1"> <span class="br0">}</span></li></ol>

The code for the function toggleFullScreen and a resize listener are placed on the main stage.

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<ol><li class="li1"> //Don't scale the movie when the stage size changes</li>
  <li class="li1"> Stage.<span class="kw3">scaleMode</span>=<span class="st0">"noScale"</span>;</li>
  <li class="li1"> <span class="co1">//Align the stage to the top left</span></li>
  <li class="li1"> <span class="kw3">Stage</span>.<span class="kw3">align</span> = <span class="st0">"TL"</span>;</li>
  <li class="li2"> <span class="co1">//Function to toggle between fullscreen and normal size</span></li>
  <li class="li1"> <span class="co1">//the toggle fullscreen button calls this function when pressed</span></li>
  <li class="li1"> <span class="kw2">function</span> toggleFullScreen<span class="br0">(</span><span class="br0">)</span><span class="br0">{</span></li>
  <li class="li1">   <span class="co1">//if normal size, go to fullscreen, else go to normal size</span></li>
  <li class="li1">   <span class="kw1">if</span><span class="br0">(</span><span class="kw3">Stage</span><span class="br0">[</span><span class="st0">"displayState"</span><span class="br0">]</span>==<span class="st0">"normal"</span><span class="br0">)</span><span class="br0">{</span></li>
  <li class="li2">     <span class="kw3">Stage</span><span class="br0">[</span><span class="st0">"displayState"</span><span class="br0">]</span>=<span class="st0">"fullScreen"</span>;</li>
  <li class="li1">   <span class="br0">}</span><span class="kw1">else</span><span class="br0">{</span></li>
  <li class="li1">     <span class="kw3">Stage</span><span class="br0">[</span><span class="st0">"displayState"</span><span class="br0">]</span>=<span class="st0">"normal"</span>;</li>
  <li class="li1">   <span class="br0">}</span></li>
  <li class="li1"> <span class="br0">}</span></li>
  <li class="li2"> <span class="co1">//Create a listener for each time the Stage is resized</span></li>
  <li class="li1"> <span class="kw2">var</span> resizeListener:<span class="kw3">Object</span> = <span class="kw2">new</span> <span class="kw3">Object</span><span class="br0">(</span><span class="br0">)</span>;</li>
  <li class="li1"> <span class="co1">//Called each time the stage is resized</span></li>
  <li class="li1"> resizeListener.<span class="kw3">onResize</span> = <span class="kw2">function</span> <span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span></li>
  <li class="li1">   <span class="co1">//Move the button to the center of the screen</span></li>
  <li class="li2">   toggleFullScreenButton.<span class="kw3">_x</span>=<span class="kw3">Stage</span>.<span class="kw3">width</span>/<span class="nu0">2</span>;</li>
  <li class="li1">   toggleFullScreenButton.<span class="kw3">_y</span>=<span class="kw3">Stage</span>.<span class="kw3">height</span>/<span class="nu0">2</span>;</li>
  <li class="li1"> <span class="br0">}</span></li>
  <li class="li1"> <span class="co1">//Add the listener to Stage</span></li>
  <li class="li1"> <span class="kw3">Stage</span>.<span class="kw3">addListener</span><span class="br0">(</span>resizeListener<span class="br0">)</span>;</li></ol>

Example XHTML used for this applet:

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<strong><object data="http://www.tutorialspalace.com/wp-content/uploads/tuts-flash/flash-fullscreen/flash-fullscreen.swf"  type="application/x-shockwave-flash" width="400" height="200" ><br>
  <param name="movie" value="http://www.tutorialspalace.com/wp-content/uploads/tuts-flash/flash-fullscreen/flash-fullscreen.swf" /><br>
  <param name="allowFullScreen" value="true" /><br>
  </object></strong>

The balls were added in to show that the stage extends to the borders of the screen, even when resized.

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