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Posted to a window when the cursor leaves the client area of the window specified in a prior call to TrackMouseEvent.
A window receives this message through its WindowProc function.
#define WM_MOUSELEAVE 0x02A3
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wParam
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This parameter is not used and must be zero.
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lParam
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This parameter is not used and must be zero.
If an application processes this message, it should return zero.
All tracking requested by TrackMouseEvent is canceled when this message is generated. The application must call TrackMouseEvent when the mouse reenters its window if it requires further tracking of mouse hover behavior.
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 2000 Professional [desktop apps only] |
| Minimum supported server |
Windows 2000 Server [desktop apps only] |
| Header |
|
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Reference
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Conceptual