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 程式師世界 >> 編程語言 >> Visual Basic語言 >> VB6 >> 建立Floating Window(Top Most的window)

建立Floating Window(Top Most的window)

編輯:VB6

事實上是使用SetWindowPos()來改變z-order,所謂z-order是屏幕一般是以x軸y軸來表示位置,而以z軸表示前後位置,這便是z-order

bWndInsertAfter的設定值

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.

wFlag的設值

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 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 the x and y parameters).

SWP_NOSIZE    Retains the current size (ignores the cx and cy parameters).

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

SWP_NOZORDER   Retains the current Z order (ignores the hwndInsertAfter parameter).

SWP_SHOWWINDOW  Displays the window.

范例

Const SWP_NOMOVE = &H2
Const SWP_NOSIZE = &H1
Const FLAG = SWP_NOMOVE Or SWP_NOSIZE
Const HWND_TOPMOST = -1
Const HWND_NOTOPMOST = -2
Const HWND_TOP = 0
Const HWND_BOTTOM = 1
Private Declare Function SetWindowPos Lib "user32" _
 (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
Private Sub Command1_Click()
Call SetWindowPos(Me.hwnd, HWND_TOPMOST, 0, 0, 0, 0, FLAG)
End Sub
Private Sub Command2_Click()
Call SetWindowPos(Me.hwnd, HWND_NOTOPMOST, 0, 0, 0, 0, FLAG)
End Sub

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