Virtual Scrolling window

Trevor DeVore lists at mangomultimedia.com
Wed Jan 9 16:19:06 EST 2008


On Jan 9, 2008, at 3:58 PM, Cal Horner wrote:

> I've been trying to create an APP. Much like a graphics PERT chart.
> Something that scrolls forever.
>
> But it seems that the largest stack size, card size or even  
> background.
> Group I can create is 32759.
> I find that number very strange because of my binary upbringing I  
> should be
> able to get 32767 as a width. But anything above that number and the
> background object disappears from sight.
>
> I would like to say the number 32759 occurs during development. In  
> other
> worlds when the stack I am working on is in the IDE.

For scrolling groups that is indeed the limit. If you want to create  
something that scrolls for what seems like forever then you can:

A) Only draw the data that is in the visible portion of the group or
B) Draw all of your data at once into child groups. Show and hide the  
child groups as the user scrolls the parent group.

Neither solution is fun but that is what you have to do.

-- 
Trevor DeVore
Blue Mango Learning Systems
www.bluemangolearning.com    -    www.screensteps.com



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