nanogui: Thread: other fltk issues

Shane,
    I think I finally understand what fltk is doing internally,
and why all the strange clipregion klugery.

Very late last night I implemented CS_OWNDC dc's, which
basically are private DC's that don't need getting and releasing.
This was done because fltk is built around X11, and the private
DC model is closer to X11.  

The problem is, that, without private DC's fltk will crash in
certain circumstances because ReleaseDC is called twice.
(ReleaseDC does nothing for private DC's.)  So I added
private DC's and now the clock demo runs without crashing.

Now, at 2 am I found myself reading the win32 tech manual,
and it says:  when private dc's are used, the update region is
not kept up, the user application has to intersect the update
region with the clip region themselves [snip]...

Well, when I had SelectClipRgn commented in, nothing
ran because it was selecting in a empty region, which clipped
all drawing, since I commented out all the other region code.
So, tonight, I'm going to add GetUpdateRgn, the only api
piece still missing, then add all the region code back in, and
I think then everything will be groovy ;-)

If you want to get the clock demo running better, you might
hack a PeekMessage for Microwindows.  Also, I haven't
been able to figure out why it draws on top of itself...
This also happens with the valuators dial control.  I think
this might be related to the region clipping, I'm hoping.

Regards,

Greg

Greg,
> If you want to get the clock demo running better, you might
> hack a PeekMessage for Microwindows.  Also, I haven't
> been able to figure out why it draws on top of itself...
> This also happens with the valuators dial control.  I think
> this might be related to the region clipping, I'm hoping.
> 
> Regards,
> 
> Greg

The strange thing Greg is that only one of the two clocks draws over
itself... yet they appear to have the similar drawing routine... very
strange.  Anyway, that's what I was looking at this morning.  I'll
probably work on the align text thing, and leave you to the
PeekMessage thing.  Once you plug in that other function for clipping
we'll see how the clock thing does, and if it's still screwed, I'll
look through it again.  (I think the Round clock is fine, the other
one is messed up)

Thanks Greg,
Shane.

> 
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:The strange thing Greg is that only one of the two clocks draws over
:itself... yet they appear to have the similar drawing routine... very
:strange.  Anyway, that's what I was looking at this morning.

Actually, both clocks draw incorrectly.  The tabs control
may sometimes redraw the background, which is why it
appears to work.



  I'll
:probably work on the align text thing, and leave you to the
:PeekMessage thing. 

I tried changing the alignment late last night, without
much success.  It's probably better to grab some X11
fonts (perhaps the one that fltk-x11 uses, and convert
it for Microwindows).

Greg
:

> Actually, both clocks draw incorrectly.  The tabs control
> may sometimes redraw the background, which is why it
> appears to work.

No, in the clock demo on my machine, the round clock screws up when
drawing, and the standard Fl_Clock does not.  Don't know why just now,
but do both clocks mess up on your computer?  Only one does here.  I
just checked again, opened up a bunch of clock's of different types,
and only the Round clocks messed up.

Thanks,
Shane.

> 
> 
> 
>   I'll
> :probably work on the align text thing, and leave you to the
> :PeekMessage thing. 
> 
> I tried changing the alignment late last night, without
> much success.  It's probably better to grab some X11
> fonts (perhaps the one that fltk-x11 uses, and convert
> it for Microwindows).
> 
> Greg
> :

Good show dudes !!!

This is looking incredible nice !!!.

Rosimildo.

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