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Full-screen mode security

Flash Player and later support full-screen mode, in which Flash content can fill the entire screen. To enter full-screen mode, the displayState property of the Stage is set to the StageDisplayState.FULL_SCREEN constant. For more information, see Working with full-screen mode.

For SWF files running in a browser, there are some security considerations.

To enable full-screen mode, in the and tags in the HTML page that contains a reference to the SWF file, add the allowFullScreen parameter, with its value set to "true" (the default value is "false"), as shown in the following example:

width="600" height="400" id="test" align="middle">

width="600" height="400"
name="test" align="middle" type="application/x-shockwave-flash"
pluginspage="" />

An HTML page may also use a script to generate SWF-embedding tags. You must alter the script so that it inserts the proper allowFullScreen settings. HTML pages generated by Flash and Flex Builder use the AC_FL_RunContent() function to embed references to SWF files, and you need to add the allowFullScreen parameter settings, as in the following:

AC_FL_RunContent( ... "allowFullScreen", "true", ...)

The ActionScript that initiates full-screen mode can be called only in response to a mouse event or keyboard event. If it is called in other situations, Flash Player throws an exception.

Users cannot enter text in text input fields while in full-screen mode. All keyboard input and keyboard-related ActionScript is disabled while in full-screen mode, with the exception of the keyboard shortcuts (such as pressing the Esc key) that return the application to normal mode.

A message appears when the content enters full-screen mode, instructing the user how to exit and return to normal mode. The message appears for a few seconds and then fades out.

Calling the displayState property of a Stage object throws an exception for any caller that is not in the same security sandbox as the Stage owner (the main SWF file). For more information, see Stage security.

Administrators can disable full-screen mode for SWF files running in browsers by setting FullScreenDisable = 1 in the mms.cfg file. For details, see Administrative user controls.

In a browser, a SWF file must be contained in an HTML page to allow full-screen mode.

Full-screen mode is always permitted in the stand-alone player or in a projector file.


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