ClipMouseToWindow – Confine the cursor to a window’s client area

Private Type RECT    Left As Long    Top As Long    Right As Long    Bottom As LongEnd TypePrivate Declare Function GetClientRect Lib "user32" (ByVal hWnd As Long, _    lpRect As RECT) As LongPrivate Declare Function ClientToScreen Lib "user32" (ByVal hWnd As Long, _    lpPoint As Any) As LongPrivate Declare Function ClipCursor Lib "user32" (lpRect As Any) As Long' confine (clip) the mouse's cursor to the client' area of a given window or control.' if the argument is omitted, any current clipping is canceledSub ClipMouseToWindow(Optional ByVal hWnd As Long)    Dim rcTarg As RECT        If hWnd Then        ' clip the mouse to the specified window        ' get the window's client area        GetClientRect hWnd, rcTarg        ' convert to screen coordinates. Two steps:        ' first, the upper-left corner        ClientToScreen hWnd, rcTarg        ' next, the bottom-right corner        ClientToScreen hWnd, rcTarg.Right        ' finally, we can clip the cursor        ClipCursor rcTarg    Else        ' unclip the mouse if no argument has been passed        ClipCursor ByVal 0&    End IfEnd Sub

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