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From: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS)
Newsgroups: comp.sys.amiga
Subject: Re: invisible windows.
Message-ID: <2448@cbmvax.UUCP>
Date: Thu, 1-Oct-87 21:11:58 EDT
Article-I.D.: cbmvax.2448
Posted: Thu Oct  1 21:11:58 1987
Date-Received: Tue, 6-Oct-87 00:35:48 EDT
References: <828@sugar.UUCP>
Reply-To: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS)
Organization: Commodore Technology, West Chester, PA
Lines: 47

In article <828@sugar.UUCP> peter@sugar.UUCP (Peter da Silva) writes:
>How do you open an invisible window in a screen, like the little window
>in the corner of the screen uShow uses to emulate a close gadget? Do you
>have to create a window and copy stuff from the screen's bitmap (I hope
>not)?
>
>Alternatively, how can you get mouse events in a screen?
>
>I'm trying to display a screen without copying the bitmap over from an
>internal buffer. That works... but I also want to get mouse events.

I ran into similar problems with my first see-an-ilbm-in-a-screen
program.  You can build a viewport around an existing bitmap, you
can build a screen around an existing bitmap, but you can only
open a SuperBitmap window with an existing bitmap.  Other windows
don't have their own bitmap, and they CLEAR the screen's bitmap under
themselves when they are opened. (So, if you HAD your picture in the
screen, it's gone after you open the window).

My solution was to break out of the ILBM loading procedure when I found
the picture size information (BMHD), open an appropriate screen
and BORDERLESS|BACKDROP window (with no title, no system gads),
do a ShowTitle(screen,false), LoadRGB4 an all black color table,
then pass the address of the screen's BitMap structure (and planes)
to the loader so it could load the picture there.  Then LoadRGB4()
the real colors.

I faked closegadget, etc. by getting MOUSEBUTTONS events and checking
the msg->MouseX and msg->MouseY to see if the mouse was clicked where a
closegadget normally is.

BTW, You can't get input events from a screen.

An alternate suggestion along the tiny window line, would be to build the
screen around your BitMap, open a SCREENQUIET screen, save a small square
area where the closegadget would be, open a small square BORDERLESS
MOUSEBUTTONS events window there, copy the small square of bitmap data
to the small window.  I don't know how well this will work, just
giving you something to try if you are set on building the display
around existing in-memory bitplanes.

-- 
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Carolyn Scheppner -- CATS   >>Commodore Amiga Technical Support<<
                     UUCP  ...{allegra,ihnp4,rutgers}!cbmvax!carolyn 
                     PHONE 215-431-9180
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