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The DeferWindowPos function updates the specified multiple-window-position structure for the specified window. The function then returns a handle to the updated structure. The EndDeferWindowPos function uses the information in this structure to change the position and size of a number of windows simultaneously. The BeginDeferWindowPos function creates the structure.

Declare Function DeferWindowPos Lib "user32" Alias "DeferWindowPos" (ByVal hWinPosInfo As Long, ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long

Operating Systems Supported
Requires Windows NT 3.1 or later; Requires Windows 95 or later


Parameter Information
· hWinPosInfo
Identifies a multiple-window - position structure that contains size and position information for one or more windows. This structure is returned by BeginDeferWindowPos or by the most recent call to DeferWindowPos.

· hWnd
Identifies the window for which update information is stored in the structure.

· hWndInsertAfter
Identifies the window that precedes the positioned window in the Z order. This parameter must be a window handle or one of the following values:
Places the window at the bottom of the Z order. If the hWnd parameter identifies a topmost window, the window loses its topmost status and is placed at the bottom of all other windows.
Places the window above all non-topmost windows (that is, behind all topmost windows). This flag has no effect if the window is already a non-topmost window.
Places the window at the top of the Z order.
Places the window above all non-topmost windows. The window maintains its topmost position even when it is deactivated.

This parameter is ignored if the SWP_NOZORDER flag is set in the uFlags parameter.

· x
Specifies the x-coordinate of the window’s upper-left corner.

· y
Specifies the y-coordinate of the window’s upper-left corner.

· cx
Specifies the window’s new width, in pixels.

· cy
Specifies the window’s new height, in pixels.

· uFlags
Specifies a combination of the following values that affect the size and position of the window:
Draws a frame (defined in the window’s class description) around the window.
Sends a WM_NCCALCSIZE message to the window, even if the window’s size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window’s size is being changed.
Hides the window.
Does not activate the window. If this flag is not set, the window is activated and moved to the top of either the topmost or non-topmost group (depending on the setting of the hWndInsertAfter parameter).
Discards the entire contents of the client area. If this flag is not specified, the valid contents of the client area are saved and copied back into the client area after the window is sized or repositioned.
Retains the current position (ignores the X and Y parameters).
Does not change the owner window’s position in the Z order.
Does not redraw changes. If this flag is set, no repainting of any kind occurs. This applies to the client area, the nonclient area (including the title bar and scroll bars), and any part of the parent window uncovered as a result of the window being moved. When this flag is set, the application must explicitly invalidate or redraw any parts of the window and parent window that need redrawing.
Same as the SWP_NOOWNERZORDER flag.
Prevents the window from receiving the WM_WINDOWPOSCHANGING message.
Retains the current size (ignores the cx and cy parameters).
Retains the current Z order (ignores the hWndInsertAfter parameter).
Displays the window.

Return Values
The return value identifies the updated multiple-window - position structure. The handle returned by this function may differ from the handle passed to the function. The new handle that this function returns should be passed during the next call to the DeferWindowPos or EndDeferWindowPos function.

If insufficient system resources are available for the function to succeed, the return value is NULL.


Related Functions



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