fxruby-users

[Fxruby-users] Attaching a Canvas to a ScrollArea

[Claus S. <Doc...@gm...>]

I have just recently started using FXRuby (~1 month), and up until
this last week I was working mostly with FXTable... However, because
FXTable doesn't let me individually set the color of FXTableItems, I
tried to rewrite my programs using an FXCanvas and drawing the items
myself. I started with the 'bounce.rbw' example that comes with the
Ruby installer (using 1.8.0-10). I got the drawing part sorted out.
However, I want to put the canvas in a FXScrollArea because eventually
it will be larger than the screen... and that's what I'm having
trouble with. I assume that I'm probably missing out on something...
the program that I started with uses an FXImage to draw the actual
image, then puts it on the canvas (or so I understand... please
correct me if I'm wrong). I thought that if I put the ScrollArea in
the MainWindow and then use it as the parent for the canvas I could
scroll the canvas, but something seems to have gon ehorribly wrong
along the way. I am unsure as to how the backbuffer (FXImage) part
operates. I'd appreciate if someone could enlighten me on this.
Attached is the tarball with my program. The part that I'm having
problems with starts on line 185. Thank you in advance for any
assistance...
   -CWS

Re: [Fxruby-users] Attaching a Canvas to a ScrollArea

[Lyle J. <ly...@kn...>]

On May 5, 2004, at 11:22 AM, Claus Spitzer wrote:

> However, I want to put the canvas in a FXScrollArea because eventually
> it will be larger than the screen... and that's what I'm having
> trouble with.

Please see the question "Why Can't I Place a Fixed-Size FXCanvas inside 
an FXScrollwindow?" near the bottom of this page:

	http://www.fox-toolkit.net/cgi-bin/wiki.pl?FAQ

For your example program, I replaced these lines:

	@scroller = FXScrollArea.new(...)
	@canvas = FXCanvas.new( @scroller, nil, 0, LAYOUT_FILL_X|LAYOUT_FILL_Y 
)

with these:

	@scroller = FXScrollWindow.new( self, LAYOUT_FILL_X|LAYOUT_FILL_Y )
	canvasFrame = FXVerticalFrame.new( @scroller, 
LAYOUT_FILL_X|LAYOUT_FILL_Y )
	@canvas = FXCanvas.new( canvasFrame, nil, 0, 
LAYOUT_FIX_WIDTH|LAYOUT_FIX_HEIGHT, 0, 0, 600, 400 )

and I get what looks reasonable. It draws a pretty picture, anyways ;)

Hope this helps,

Lyle

Re: [Fxruby-users] Attaching a Canvas to a ScrollArea

[Claus S. <Doc...@gm...>]

Thanks for the help! I figured the problem was along those lines, but
hadn't been successful as of then. Your code helped a lot, (though the
canvas had ended up being smaller than what the table needed, its size
depending on the number of rows and columns... I got that one fixed
though :) ).
Now to phase 2 - reimplement connect(...), and phase 3 - profit! 

On Mon, 10 May 2004 19:33:34 -0500, Lyle Johnson <ly...@kn...> wrote:
> 
> 
> On May 5, 2004, at 11:22 AM, Claus Spitzer wrote:
> 
> > However, I want to put the canvas in a FXScrollArea because eventually
> > it will be larger than the screen... and that's what I'm having
> > trouble with.
> 
> Please see the question "Why Can't I Place a Fixed-Size FXCanvas inside
> an FXScrollwindow?" near the bottom of this page:
> 
>         http://www.fox-toolkit.net/cgi-bin/wiki.pl?FAQ
> 
> For your example program, I replaced these lines:
> 
>         @scroller = FXScrollArea.new(...)
>         @canvas = FXCanvas.new( @scroller, nil, 0, LAYOUT_FILL_X|LAYOUT_FILL_Y
> )
> 
> with these:
> 
>         @scroller = FXScrollWindow.new( self, LAYOUT_FILL_X|LAYOUT_FILL_Y )
>         canvasFrame = FXVerticalFrame.new( @scroller,
> LAYOUT_FILL_X|LAYOUT_FILL_Y )
>         @canvas = FXCanvas.new( canvasFrame, nil, 0,
> LAYOUT_FIX_WIDTH|LAYOUT_FIX_HEIGHT, 0, 0, 600, 400 )
> 
> and I get what looks reasonable. It draws a pretty picture, anyways ;)
> 
> Hope this helps,
> 
> Lyle
> 
> -------------------------------------------------------
> This SF.Net email is sponsored by Sleepycat Software
> Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to deliver
> higher performing products faster, at low TCO.
> http://www.sleepycat.com/telcomwpreg.php?From=osdnemail3
> _______________________________________________
> Fxruby-users mailing list
> Fxr...@li...
> https://lists.sourceforge.net/lists/listinfo/fxruby-users
>