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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| -
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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WM_NCMBUTTONDBLCLK
The WM_NCMBUTTONDBLCLK message is posted when the user double-clicks the
middle mouse button while the cursor is within the nonclient area of a window. This
message is posted to the window that contains the cursor. If a window has
captured the mouse, this message is not posted.
WM_NCMBUTTONDBLCLK
nHittest = (INT) wParam; // hit-test value
pts = MAKEPOINTS(lParam); // position of cursor
Parameters
nHittest
Value of wParam. Specifies the hit-test value returned by the DefWindowProc function as a result of processing the WM_NCHITTEST message. For a list of
hit-test values, see WM_NCHITTEST.
pts
Value of lParam. Specifies a POINTS structure that contains the x- and y-coordinates of the cursor. The
coordinates are relative to the upper-left corner of the screen.
Return Values
If an application processes this message, it should return zero.
Remarks
A window need not have the CS_DBLCLKS style to receive WM_NCMBUTTONDBLCLK
messages.
Windows generates a WM_NCMBUTTONDBLCLK message when the user presses,
releases, and again presses the middle mouse button within the system's double-click
time limit. Double-clicking the middle mouse button actually generates four
messages: WM_NCMBUTTONDOWN, WM_NCMBUTTONUP, WM_NCMBUTTONDBLCLK, and WM_NCMBUTTONUP
again.
An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure.
If it is appropriate to do so, the system sends the WM_SYSCOMMAND message to
the window.
See Also
DefWindowProc, MAKEPOINTS, POINTS, WM_NCHITTEST, WM_NCMBUTTONDOWN, WM_NCMBUTTONUP, WM_SYSCOMMAND
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