OpenEuphoria

Title-less window: Restore/Maximize enablement wrong on Alt_Space menu (arwen)

• Posted by Pete Lomax <petelomax at blue?on?er.co.uk> Nov 01, 2007
• 688 views

Hi,
I noticed a minor problem with a demo (arwen) program I wrote a while back.

This program (see below) demonstrates hiding/displaying a window titlebar, and
should work for normal (aka "restored") and maximised windows.

When you press alt-space, you get the expected
Restore/Move/Size/Minimise/Maximise/Close menu, and one of Restore/Maximise is
always greyed out.
The menu appears whether or not the title bar is visible, so far so good.

Now, if the title bar is visible, and you alt-space Restore/Maximise, then press
alt-space again, the enabled options have swapped as they should.

However if you do this with the titlebar invisible, they are wrong/unchanged.

Obviously in the "toggle" demo, I can "toggle" the title as a work-round, but if
the title is permanently off, it could be a bit of a problem...

I wonder if this is a bug which is fixed in later versions of Windows?

The more I think about it, I doubt it can be caused by what I've done, since it
is a keyboard event long after, which is failing to swap enabled states,
but I still hope it is just some flag or event or other I am missing...

I have tested this on both an old and the latest version of arwen.

--
-- title-less window demo
--
include arwen.ew
without warning

constant Window1 = create(Window, "Press Escape to toggle", 0, 0, 100, 100, 400,
300, 0),
	 w1txt = create(Label,"Press Escape to toggle",0,Window1,10,10,200,25,0),
	 w1Hwnd=getHwnd(Window1)

constant    -- (to be incorporated into constants.ew)
    -- ShowWindowPos flags (needed after setWindowLong to remove cached effects)
    SWP_NOSIZE		= #0001,
    SWP_NOMOVE		= #0002,
    SWP_NOZORDER	= #0004,
    SWP_NOREDRAW	= #0008,
    SWP_NOACTIVATE	= #0010,
    SWP_FRAMECHANGED	= #0020,
    SWP_SHOWWINDOW	= #0040,
    SWP_HIDEWINDOW	= #0080,
    SWP_NOCOPYBITS	= #0100,
    SWP_NOOWNERZORDER	= #0200,
    SWP_NOSENDCHANGING	= #0400,
    SWP_DRAWFRAME	= SWP_FRAMECHANGED,
    SWP_NOREPOSITION	= SWP_NOOWNERZORDER,
    SWP_DEFERERASE	= #2000,
    SWP_ASYNCWINDOWPOS	= #4000,
SWP_UPDATECACHE	=
    SWP_NOSIZE+SWP_NOMOVE+SWP_NOZORDER+SWP_FRAMECHANGED+SWP_NOCOPYBITS

procedure toggleTitle()
atom style
    style = c_func(xGetWindowLong,{w1Hwnd, GWL_STYLE })
    style = xor_bits(style,WS_BORDER)
    void = c_func(xSetWindowLong,{w1Hwnd,GWL_STYLE,style})
    void = c_func(xSetWindowPos,{w1Hwnd,0,0,0,0,0,SWP_UPDATECACHE})
end procedure
-- uncomment this to start without a title:
--toggleTitle()

function w1Handler(integer id, integer msg, atom wParam, object lParam)
    if msg = WM_KEYDOWN and wParam = VK_ESCAPE then toggleTitle() end if
    return 0
end function
setHandler(Window1, routine_id("w1Handler"))

WinMain( Window1, SW_NORMAL )
--WinMain( Window1, SW_MAXIMIZE )

Regards,
Pete