FW: Test77 multiwindow mouse weirdness

[Harold L Hunt II]

Nick,

The problem here is not so much the "origin" of the screen; I just used 
Piers's term because thats what he would understand.  The real problem 
here is that we calculate the useable portion of the screen and we use 
that as our virtual origin of the screen.  This correctly handled 
staying away from a taskbar that was on the left of the screen before, 
but the multi-window mode is not using the offset that is calculate 
earlier in the code.

Granted, using SM_XSCREEN or SM_XVIRTUALSCREEN is still correct, but 
that isn't really the issue here.

Harold

Nick Crabtree wrote:
> Harold,
> 
> The assumption that the screen origin is 0,0 is one of the things I had
> to fix for the multiple monitors patch. In general SM_XSCREEN and
> SM_YSCREEN should _always_ be used to discover the origin (or more
> generally SM_XVIRTUALSCREEN ...). In most configurations this will
> indeed return 0,0 but it should not be assumed that this is the case.
> 
> I had also noticed this problem with multiwindow mode on my twin monitor
> set-up. If I set my left screen to be the primary then the origin is 0,0
> and multiwindow mode stretches across both monitors. If the right screen
> is primary then the origin is -1200,0 and mutiwindow mode only works on
> the right monitor.
> 
> I was going to have a look at this in a few weeks when I should have
> some spare time.
> 
> Nick
> 
> -----Original Message-----
> From: cygwin-xfree-owner@cygwin.com
> [mailto:cygwin-xfree-owner@cygwin.com] On Behalf Of Harold L Hunt II
> Sent: 12 February 2003 22:14
> To: cygwin-xfree@cygwin.com
> Subject: Re: FW: Test77 multiwindow mouse weirdness
> 
> 
> Piers,
> 
> Yes, that is strange.  I think the problem is that, as you said, the 
> multiwindow mode is assuming that the screen is based at 0, 0.  That 
> isn't a problem for the non-multiwindow mode, but there was obviously 
> some sort of oversight in the multiwindow mode that caused this problem 
> to show up.  I may look into it eventually, but if you have any 
> inclination to peek at the source yourself (it is accessible via cvsweb 
> and well commented) then I would appreciate it if you could try to 
> locate the problem for me.
> 
> Harold
> 
> Harold L Hunt II wrote:
> 
>>Here is a message from Piers Haken reporting a problem with 
>>mutliwindow
>>mode.  His emails get bounced because Exchange insists on munging his 
>>email.
>>
>>Harold
>>
>> > -----Original Message-----
>> > From: Piers Haken
>> > Sent: Tuesday, February 11, 2003 11:22 PM
>> > To: 'cygwin-xfree@cygwin.com'
>> > Subject: Test77 multiwindow mouse weirdness
>> >
>> >
>> > I'm seeing some weirdness with the mouse cursor in Test77's 
>>multiwindow  > mode.  >
>> > Note: I have my windows taskbar attached to the left-hand edge of
> 
> the
> 
>> > screen instead of the bottom.
>> >
>> > Here's how to see what I'm seeing:
>> > 1) install test77
>> > 2) unlock the taskbar.
>> > 3) dock the taskbar to the left-hand side of the screen
>> > 4) run 'XWin-Test77 -multiwindow'
>> > 5) open an xterm
>> > 6) look at the position of the xterm window.
>> > 7) now click on the 'Cygwin/XFree86 rl' window so the root is
> 
> visible.
> 
>> >         Notice how the position of the xterm window is different
>> > depending on whether or not the root window is shown. When the root
>> > window is shown the xterm jumps to the right exactly by the width
> 
> of the
> 
>> > taskbar.
>> >
>> > 8) while the root window is on top, move the mouse around.
>> >         Notice that the mouse cursor occasionally jumps to the
> 
> right,
> 
>> > again by the same amount as the width of the taskbar.
>> >
>> > 9) show both the root window AND the xterm, so the multiwindow
> 
> xterm
> 
>> > with the windows decorations is on top of the root window.
>> >
>> >         Notice that the two versions of the xterm window do not
> 
> line up.
> 
>> >
>> > I know this isn't a very common or very severe bug but it does seem
> 
> to
> 
>> > indicate an underlying problem in the calculation of the desktop
>> > bounding rectangle. Perhaps you're assuming, incorrectly in
> 
> general,
> 
>> > that the desktop starts at (0,0)?
>> >
>> > Piers.
>> >
>>
> 
> 
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