Microsoft Windows CE 3.0  

DeferWindowPos

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

HDWP DeferWindowPos( HDWP
hWinPosInfo, 
HWND
hWnd, 
HWND
hWndInsertAfter, 
int
x, 
int
y, 
int
cx, 
int
cy, 
UNIT
uFlags
);

Parameters

hWinPosInfo
Handle to a multiple-window—position structure that contains size and position information for one or more windows. This structure is returned by BeginDeferWindowPosor by the most recent call to DeferWindowPos.
hWnd
Handle to the window for which update information is stored in the structure.
hWndInsertAfter
Handle to the window that precedes the positioned window in the z-order. This parameter must be a window handle or one of the following values:
Value Description
HWND_BOTTOM Places the window at the bottom of the z-order. If the hWndparameter identifies a topmost window, the window loses its topmost status and is placed at the bottom of all other windows.
HWND_NOTOPMOST 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.
HWND_TOP Places the window at the top of the z-order.
HWND_TOPMOST 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 uFlagsparameter.

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:
Value Description
SWP_DRAWFRAME Draws a frame (defined in the window's class description) around the window.
SWP_FRAMECHANGED 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.
SWP_HIDEWINDOW Hides the window.
SWP_NOACTIVATE 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 hWndInsertAfterparameter).
SWP_NOCOPYBITS 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.
SWP_NOMOVE Retains the current position (ignores the Xand Yparameters).
SWP_NOOWNERZORDER Does not change the owner window's position in the z-order.
SWP_NOREDRAW 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.
SWP_NOREPOSITION Same as the SWP_NOOWNERZORDER flag.
SWP_NOSIZE Retains the current size (ignores the cxand cyparameters).
SWP_NOZORDER Retains the current z-order (ignores the hWndInsertAfterparameter).
SWP_SHOWWINDOW 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 DeferWindowPosor EndDeferWindowPosfunction.

NULL indicates that insufficient system resources are available for the function to succeed. To get extended error information, call GetLastError.

Windows CE Remarks

The uFlagsparameter does not support the SWP_DRAWFRAME, SWP_NOCOPYBITS, SWP_NOREDRAW, SWP_NOREPOSITION, SWP_NOOWNERZORDER, and SWP_NOSENDCHANGING flags.

Remarks

If a call to DeferWindowPosfails, the application should abandon the window-positioning operation and not call EndDeferWindowPos.

If SWP_NOZORDER is not specified, the system places the window identified by the hWndparameter in the position following the window identified by the hWndInsertAfterparameter. If hWndInsertAfteris NULL or HWND_TOP, the system places the hWndwindow at the top of the z-order. If hWndInsertAfteris set to HWND_BOTTOM, the system places the hWndwindow at the bottom of the z-order.

All coordinates for child windows are relative to the upper-left corner of the parent window's client area.

A window can be made a topmost window either by setting hWndInsertAfterto the HWND_TOPMOST flag and ensuring that the SWP_NOZORDER flag is not set, or by setting the window's position in the z-order so that it is above any existing topmost windows. When a non-topmost window is made topmost, its owned windows are also made topmost. Its owners, however, are not changed.

If neither the SWP_NOACTIVATE nor SWP_NOZORDER flag is specified (that is, when the application requests that a window be simultaneously activated and its position in the z-order changed), the value specified in hWndInsertAfteris used only in the following circumstances:

  • Neither the HWND_TOPMOST nor HWND_NOTOPMOST flag is specified in hWndInsertAfter.
  • The window identified by hWndis not the active window.

    An application cannot activate an inactive window without also bringing it to the top of the z-order. An application can change an activated window's position in the z-order without restrictions, or it can activate a window and then move it to the top of the topmost or non-topmost windows.

    A topmost window is no longer topmost if it is repositioned to the bottom (HWND_BOTTOM) of the z-order or after any non-topmost window. When a topmost window is made non-topmost, its owners and its owned windows are also made non-topmost windows.

    A non-topmost window may own a topmost window, but not vice versa. Any window (for example, a dialog box) owned by a topmost window is itself made a topmost window to ensure that all owned windows stay above their owner.

    Requirements

    Runs on Versions Defined in Include Link to
    Windows CE OS 2.10 and later Winuser.h    
    Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

    See Also

    BeginDeferWindowPos, EndDeferWindowPos


    Last updated on Friday, May 26, 2006

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