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Help me understand Maximize event functions

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I have a GUI that has set up a Maximize event function. Inside it, I want to prevent it from using the entire size of the display, so I calculate the correct left, top, width, and heiht. Then I call WinMove with these values. But even though I'm sure that the height is less than the full height possible, after the WinMove it fills the entire height ot the display anyway, which I don't understand. It would help if I knew WHEN the max func is called in relation to what the OS does/may do.  Has the OS/Autoit internals already maximized the window by the time my func is invoked?  Or does the OS/Autoit internals change the window height after the call?  What could be causing the window to use the whole height after WinMove?


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The window maximize event is controlled much more by Windows than by AutoIt. Therefore you have to use Windows code to implement such functionality. That is, you have to respond to the WM_GETMINMAXINFO Windows message. Something like this:

#AutoIt3Wrapper_Au3Check_Parameters=-d -w 1 -w 2 -w 3 -w 4 -w 5 -w 6

#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>

Opt( "MustDeclareVars", 1 )


Func Example()
  Local $hGui = GUICreate( "Test", 400, 300, -1, -1, $WS_OVERLAPPEDWINDOW )



  While 1
    Switch GUIGetMsg()

  GUIDelete( $hGui )

Func WM_GETMINMAXINFO( $hWnd, $iMsg, $wParam, $lParam )
  Static $tagMINMAXINFO = "struct; long ReservedX;long ReservedY;long MaxSizeX;long MaxSizeY;long MaxPositionX;long MaxPositionY;" & _
                          "long MinTrackSizeX;long MinTrackSizeY;long MaxTrackSizeX;long MaxTrackSizeY; endstruct"
  Local $tMINMAXINFO = DllStructCreate( $tagMINMAXINFO, $lParam )
  DllStructSetData( $tMINMAXINFO, "MaxSizeX", 800 )
  DllStructSetData( $tMINMAXINFO, "MaxSizeY", 600 )
  DllStructSetData( $tMINMAXINFO, "MaxPositionX", 100 )
  DllStructSetData( $tMINMAXINFO, "MaxPositiony", 100 )
  DllStructSetData( $tMINMAXINFO, "MaxTrackSizeX", 800 )
  DllStructSetData( $tMINMAXINFO, "MaxTrackSizeY", 600 )
  Return 0
  #forceref $hWnd, $iMsg, $wParam


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That was very helpful. gracias

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