Win32: How to draw outside my window?

Question

Looking at the Windows class tooltip window tooltips, I see that it draws its shadow outside the actual rectangle of the tooltip window.

Using SpyXX - I can get a help window and class styles:

Rectangle:     (440, 229)-(544, 249), 104x20
Restored Rect: (440, 229)-(544, 249), 104x20
Client Rect:   (0, 0)-(104, 20), 104x20

You will notice that the shadow that you see is physically outside the window that is looming. How can I draw a shadow outside around my window, and outside my window?

Note : The shadow is not drawn using the standard style CS_DROPSHADOW. I confirmed this experimentally and can also see the class style for a window in SpyXX ; he does not use CS_DROPSHADOW:

Windows Styles:     94000001

    WS_POPUP        80000000
    WS_VISIBLE      10000000
    WS_CLIPSIBLINGS  4000000
    TTS_ALWAYSTIP          1

Extended Styles:    00080088

    WS_EX_LAYERED      80000
    WS_EX_TOOLWIN         80
    WS_EX_TOPMOST          8

So how can I draw outside my window?

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Answer 1

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Answer 3

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