TrackMouseEvent

[New - Windows NT]

The TrackMouseEvent function posts messages when the mouse pointer leaves a window or hovers over a window for a specified amount of time.

BOOL TrackMouseEvent(

LPTRACKMOUSEEVENT lpEventTrack	// pointer to a TRACKMOUSEEVENT structure
);

Parameters

lpEventTrack

Pointer to a TRACKMOUSEEVENT structure.

Return Values

If the function succeeds, the return value is nonzero .

If the function fails, return value is zero. To get extended error information, call GetLastError.

The messages that the function can post are the following:

Message	Meaning
WM_MOUSEHOVER	The mouse hovered over the client area of the window for the period of time specified in a prior call to TrackMouseEvent. Hover tracking stops when this message is generated. The application must call TrackMouseEvent again if it requires further tracking of mouse hover behavior.
WM_MOUSELEAVE	The mouse left the client area of the window specified in a prior call to TrackMouseEvent. All tracking requested by TrackMouseEvent is canceled when this message is generated. The application must call TrackMouseEvent when the mouse re-enters its window if it requires further tracking of mouse hover behavior.

Remarks

The mouse pointer is considered to be hovering when it stays within a specified rectangle for a specified period of time. Call SystemParametersInfo and use the values SPI_GETMOUSEHOVERWIDTH, SPI_GETMOUSEHOVERHEIGHT, and SPI_GETMOUSEHOVERTIME to retrieve the size of the rectangle and the time.

See Also

SystemParametersInfo, TRACKMOUSEEVENT

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