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SetWindowPos Function
------------------------------------------------------------------------
The *SetWindowPos* function 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.
Syntax
BOOL SetWindowPos(
HWND /hWnd/,
HWND /hWndInsertAfter/,
int /X/,
int /Y/,
int /cx/,
int /cy/,
UINT /uFlags/
);
Parameters
/hWnd/
[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.
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] Specifies the new position of the left side of the window,
in client coordinates.
/Y/
[in] Specifies the new position of the top of the window, in
client coordinates.
/cx/
[in] Specifies the new width of the window, in pixels.
/cy/
[in] Specifies the new height of the window, in pixels.
/uFlags/
[in] Specifies the window sizing and positioning flags. This
parameter can be a combination of the following values.
SWP_ASYNCWINDOWPOS
If the calling thread and the thread that owns the window
are attached to different input queues, the system posts the
request to the thread that owns the window. This prevents
the calling thread from blocking its execution while other
threads process the request.
SWP_DEFERERASE
Prevents generation of the WM_SYNCPAINT message.
SWP_DRAWFRAME
Draws a frame (defined in the window's class description)
around the window.
SWP_FRAMECHANGED
Applies new frame styles set using the SetWindowLong
function. 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 /hWndInsertAfter/ parameter).
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 /X/ and /Y/ parameters).
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_NOSENDCHANGING
Prevents the window from receiving the WM_WINDOWPOSCHANGING
message.
SWP_NOSIZE
Retains the current size (ignores the /cx/ and /cy/
parameters).
SWP_NOZORDER
Retains the current Z order (ignores the /hWndInsertAfter/
parameter).
SWP_SHOWWINDOW
Displays the window.
Return Value
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended
error information, call GetLastError.
Remarks
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 *SetWindowLong*, you
must call *SetWindowPos* to have the changes take effect. Use the
following combination for /uFlags/: SWP_NOMOVE | SWP_NOSIZE |
SWP_NOZORDER | SWP_FRAMECHANGED.
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 a 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 /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.
An application cannot activate an inactive window without also
bringing it to the top of the Z order. Applications 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.
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.
Example
For an example, see Initializing a Dialog Box.
Function Information
Header Declared in Winuser.h, include Windows.h
Import library User32.lib
Minimum operating systems Windows 95, Windows NT 3.1
See Also
Windows Overview, MoveWindow, SetActiveWindow, SetForegroundWindow
william.designer escreveu:
>
> Olá a todos, estou com uma dúvida cruel...
> estou criando um aplicativo que o usuário tem logar para ter acesso
> a área de trabalho. quando o usuário loga na parte superior da tela
> fica um pequeno formulario mostrando o nome do usuário, o relogio e
> um contatador de tempo.
>
> criei uma váriavel global
> Fechar:Boolean=False
> Coloquei no evento OnCloseQuery
> CanClose:=Fechar;
> Criei um botão Fechar e coloquei o seguinte codigo no Onclick
> Fechar:=True;
> Close;
> fiz isso para evitar que a tela fosse fechada com ALT+F4
>
> Nas propriedades do formulario retirei as bordas da janela;
> até ai tudo bem...
>
> porém também alterei o FormStyle para fsStayOnTop;
> fiz isso para que esta janelinha fique aparecendo o tempo todo sobre
> qualquer aplicativo que o usuario abrir no windows...
> porém não está funcionando...alguem sabe me dizer se fiz algo errado
> ou se deixei de fazer alguma coisa...
>
> estou precisando muito desta informação,,, deste já agradeço a
> todos...
>
>
[As partes desta mensagem que não continham texto foram removidas]
