INFO: Transparent Windows

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Article ID: 92526 - View products that this article applies to.
This article was previously published under Q92526
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SUMMARY

Microsoft Windows version does not support fully functional transparent windows.

MORE INFORMATION

If a window is created using CreateWindowEx() with the WS_EX_TRANSPARENT style, windows below it at the position where the original window was initially placed are not obscured and show through. Moving the WS_EX_TRANSPARENT window, however, results in the old window background moving to the new position, because Windows does not support fully functional transparent windows.

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

In Windows 2000, specific colors in a window can be made truly transparent by giving the window the WS_EX_LAYERED extended style and calling SetLayeredWindowAttributes.

Properties

Article ID: 92526 - Last Review: July 11, 2005 - Revision: 1.2
APPLIES TO
  • Microsoft Platform Software Development Kit-January 2000 Edition
  • Microsoft Windows Software Development Kit 3.1
Keywords: 
kbinfo kbwndwprop kbwndw KB92526

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