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The Position of a Maximized Window
As a Windows user, you know that you can maximize a window from the system menu or by clicking a button at the top right corner of the window. You can return a maximized window to its original size in a similar fashion. It's obvious that a maximized window remembers its original size and position.The CWnd function GetWindowRect retrieves the screen coordinates of a window. If a window is maximized, GetWindowRect returns the coordinates of the screen rather than the window's unmaximized coordinates. If a persistent frame class is to work for maximized windows, it has to know the window's unmaximized coordinates. CWnd::GetWindowPlacement retrieves the unmaximized coordinates together with some flags that indicate whether the window is currently minimized or maximized.The companion SetWindowPlacement function lets you set the maximized and minimized status and the size and position of the window. To calculate the position of the top left corner of a maximized window, you need to account for the window's border size, which is obtainable from the Win32 GetSystemMetrics function. Later in the chapter, you'll see the
Persist.cpp file, in which the CPersistentFrame::ActivateFrame code shows an example of how SetWindowPlacement is used.