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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_WINDOWPOSCHANGING
The WM_WINDOWPOSCHANGING message is sent to a window whose size, position, or
place in the Z order is about to change as a result of a call to the SetWindowPos function or another window-management function.
WM_WINDOWPOSCHANGING
lpwp = (LPWINDOWPOS) lParam; // points to size and position data
Parameters
lpwp
Value of lParam. Points to a WINDOWPOS structure that contains information about the window's new size and position.
Return Values
If an application processes this message, it should return zero.
Default Action
For a window with the WS_OVERLAPPED or WS_THICKFRAME style, the DefWindowProc function sends the WM_GETMINMAXINFO message to the window. This is done to
validate the new size and position of the window and to enforce the
CS_BYTEALIGNCLIENT and CS_BYTEALIGNWINDOW client styles. By not passing the
WM_WINDOWPOSCHANGING message to the DefWindowProc function, an application can override these defaults.
Remarks
While this message is being processed, modifying any of the values in WINDOWPOS affects the window's new size, position, or place in the Z order. An
application can prevent changes to the window by setting or clearing the appropriate
bits in the flags member of WINDOWPOS.
See Also
DefWindowProc, EndDeferWindowPos, SetWindowPos, WINDOWPOS, WM_GETMINMAXINFO, WM_MOVE, WM_SIZE, WM_WINDOWPOSCHANGED
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