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From: harryk@bucsf.bu.edu (Harry Karayiannis)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Closing AES boxes interfering with VDI drawing
Message-ID: <71214@bu.edu.bu.edu>
Date: 23 Dec 90 00:15:27 GMT
References: <111628@convex.convex.com> <3391@medusainformatik.uni-erlangen.de> <1990Dec18.161238.24031@unixg.ubc.ca>
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Reply-To: harryk@bucsf.bu.edu (Harry Karayiannis)
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Organization: Computer Science Department, Boston University, Boston, MA, USA
Lines: 37

In article <1990Dec18.161238.24031@unixg.ubc.ca> mintha@unixg.ubc.ca (Jim Mintha) writes:
>
>     I'm writing a program that uses only AES, and not VDI.  When I put up
>a dialog box, I save the portion of the screen used with my own copy routines,
>and when the dialog finishes, I copy the region back.  Everything works fine
>except when the user moves the mouse at a later time, a small square the size
>of the mouse appears with the standard desktop background pattern.  Is there
>anyway to avoid this, can I change the buffer used to hold what is underneath
>the mouse pointer background?
>
>--
>-------------------------------------------------------------------------------
>Jim Mintha					University of British Columbia
>Programming Assistant				Geography Department
>e-mail: mintha@geog.ubc.ca			Vancouver, B.C.


  The problem should be that you don't hide the mouse before you make any 
changes to the screen. A procedure that should work is the following:

	1. hide the mouse ( AES: graf_mouse(M_OFF, 0L), or
			    VDI: v_hide_c(vdi_handle)
			  )
	2. save the screen-area that the dialog box will cover
	3. show the mouse ( AES: graf_mouse(M_ON, 0L), or
			    VDI: v_show_c(vdi_handle, 0)
			  )
	4. display & manipulate the dialog box
			  ( objc_draw(...) and form_do(..) or evnt_multi(...))
	5. same as 1
	6. restore the screen-area saved in step 2.
	7. same as 3


Hope we helped.......
				Alex Volanis,
				Harry Karayiannis