GweBypassCoredllThunk_t::SetWindowPos_I

  • Article

This method changes the size, position, and z-order of a child, pop-up, or top-level window. Child, pop-up, and top-level windows are ordered according to their appearance on the screen. The topmost window receives the highest rank and is the first window in the z-order.

static BOOL WINAPI SetWindowPos_I(
  HWND hwndThis,
  HWND hwndInsertAfter,
  int x,
  int y,
  int cx,
  int cy,
  UINT fuFlags
);

Parameters

  • hwndThis
    [in] Handle to the window.

  • hwndInsertAfter
    [in] Handle to the window to precede 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 hWnd parameter 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.

    For more information about how this parameter is used, see the following Remarks section.

  • x
    [in] Integer that specifies the new position of the left side of the window, in client coordinates.

  • y
    [in] Integer that specifies the new position of the top of the window, in client coordinates.

  • cx
    [in] Integer that specifies the new width of the window, in pixels.

  • cy
    [in] Integer that specifies the new height of the window, in pixels.

  • fuFlags
    [in] Unsigned integer that specifies the window sizing and positioning flags. The following table shows the possible values.

    Value Description
    SWP_DRAWFRAME Draws a frame, as defined in the class description for the window, around the window.
    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 hWndInsertAfter parameter.
    SWP_NOMOVE Retains the current position and ignores the X and Y parameters.
    SWP_NOOWNERZORDER Does not change the position of the owner window in the z-order.
    SWP_NOREPOSITION Same as the SWP_NOOWNERZORDER flag.
    SWP_NOSIZE Retains the current size and ignores the cx and cy parameters.
    SWP_NOZORDER Retains the current z-order and ignores the hWndInsertAfter parameter.
    SWP_SHOWWINDOW Displays the window.

Return Values

Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.

Remarks

This method is an internal version of the SetWindowPos function.

If the specified window is a visible top-level window and the SWP_NOACTIVATE flag is not specified, this method activates the window. If the window is the currently active and the SWP_HIDEWINDOW flag is specified, the activation is passed on to another visible top-level window.

A window can be made a topmost window either by setting the hWndInsertAfter parameter to HWND_TOPMOST and ensuring that the SWP_NOZORDER flag is not set, or by setting the position of the window in the z-order so that the window 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 hWndInsertAfter is used only in the following circumstances:

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

When you set the SWP_FRAMECHANGED flag in the nFlags parameter to this function, Windows CE redraws the entire nonclient area of the window, which can change the size of the client area. This procedure is the only way to get the nonclient area to be recalculated and is typically used after you have changed the window style by calling GweBypassCoredllThunk_t::SetWindowLongW_I.

If the SWP_SHOWWINDOW or SWP_HIDEWINDOW flag is set, the window cannot be moved or sized.

If you have changed certain window data using GweBypassCoredllThunk_t::SetWindowLongW_I, you must call GweBypassCoredllThunk_t::SetWindowPos_I to have the changes take effect. Use the following combination for uFlags: SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED.

GweBypassCoredllThunk_t::SetWindowPos_I always causes a WM_WINDOWPOSCHANGED message to be sent to the window. The flags passed in this message are exactly the same as those passed into the method. No other messages are sent by this method.

If an owned window was created with the WS_OVERLAPPED style, GweBypassCoredllThunk_t::SetWindowPos_I uses the parent window coordinates to reposition the owned window. If the owned window was created using the WS_POPUP style, it is repositioned using screen coordinates.

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

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

A non-topmost window can own a topmost window, but the reverse cannot occur. 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.

If an application is not in the foreground, and should be in the foreground, it must call the SetForegroundWindow function.

Requirements

OS Versions: Windows CE .NET 4.0 and later.
Header: GweBypassCoredllThunk.hpp.

See Also

SetForegroundWindow | SetWindowPos | GweBypassCoredllThunk_t::MoveWindow_I | GweBypassCoredllThunk_t::SetWindowLongW_I | WM_WINDOWPOSCHANGED

Last updated on Wednesday, April 13, 2005

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