INFO: Transparent Windows

This article was previously published under Q92526
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SUMMARY
Microsoft Windows version does not support fully functional transparentwindows.
MORE INFORMATION
If a window is created using CreateWindowEx() with the WS_EX_TRANSPARENTstyle, windows below it at the position where the original window wasinitially placed are not obscured and show through. Moving theWS_EX_TRANSPARENT window, however, results in the old window backgroundmoving to the new position, because Windows does not support fullyfunctional transparent windows.

WS_EX_TRANSPARENT was designed to be used in very modal situations and thelifetime of a window with this style must be very short. A good use of thisstyle is for drawing tracking points on the top of another window. Forexample, a dialog editor would use it to draw tracking points around thecontrol that is being selected or moved.

In Windows 2000, specific colors in a window can be made truly transparentby giving the window the WS_EX_LAYERED extended style and callingSetLayeredWindowAttributes.
Properties

Article ID: 92526 - Last Review: 12/04/2015 09:19:49 - Revision: 1.2

Microsoft Platform Software Development Kit-January 2000 Edition, Microsoft Windows Software Development Kit 3.1

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