From: kutch AT moop DOT csse DOT muroran-it DOT ac DOT jp (Patrick G. Kutch)
Newsgroups: comp.os.msdos.djgpp
Subject: Compiler  bug in Allegro?  Shawn, DJ?
Date: Fri, 11 Apr 1997 00:21:11 GMT
Organization: Muroran Institute of Technology
Lines: 46
Message-ID: <5ik06u$42q@yayrap.cc.muroran-it.ac.jp>
NNTP-Posting-Host: moope.csse.muroran-it.ac.jp
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

I have been 'playing' with Allegro's (2.2) gui system, trying to add
bitmap buttons and stuff like that.  The first thing I did was to sit
down and go through the existing code.

I came across the find_mouse_object() and saw that it could be
optimized a little by simply adding a break after the object has been
found.  So the routine now looks like this:

   for (c=0; d[c].proc; c++)
      if ((mouse_x >= d[c].x) && (mouse_y >= d[c].y) &&
    (mouse_x < d[c].x + d[c].w) && (mouse_y < d[c].y + d[c].h) &&
    (!(d[c].flags & (D_HIDDEN | D_DISABLED))))
    {
        mouse_object = c;
        break;
    }

   return mouse_object;


Nothing too complex there, all i did was add a set of {} and a break.

However, this causes all kind of problems.  After doing this, the
routine doesn't seem to work properly.  The focus will be lost while
definitley moving over a button.

If you make only the changes shown above and then re-compile.  Both
Ex13 and Ex14 will display odd behaviour.  Specifically, for me
anyhow, in EX13 the 'Toggle me' button's focus is not consistant when
simply passing the mouse over the button.  Same thing when the dialog
exits, the alert's button focus act's add.  In EX14 you can see
similar problems.

At first, I thought it might be some optimization bug I was unaware
of, so I have  re-compiled with and without DEBUGMODE set in the
Allegro makefile and the results were the same.  

So, I am at a loss and looking to those much more knowledgeable than I
for some assistance.

Thanx,

- Patrick