Visual effects to scroll up a field?

[Jim Ault]

Quick suggestion about '
>can be applied to JUST A PART of a window -
put the scrolling field in a subStack (of the same size as the field) and
position it over the main stack (now functioning as a background)

Further, you could use windowShape to mask the text field, then smoothly
move the text field up or down under the mask, creating a scroll effect and
not require the unsightly scroll bars.  Now that the field is static text,
you could add visual components to the margin, etc to enhance the message.

This could lead to two independent sub stacks that could function
side-by-side and provide 'chapter' or 'heading' scroll.

You might want to look at the excellent
windowlab.rev  stack by Scott Rossi downloadable from www.tactilemedia.com
Fast, easy windowshape examples that might answer your interface needs.


Jim Ault
Las Vegas

On 5/20/06 1:36 AM, "Terry Vogelaar" <tvogelaar at de-mare.nl> wrote:

> Hi all,
> 
> I am working on an application for presenting text on an LCD
> projector. Not just phrases like with a normal presentation, but the
> audience actually have to read along with the (quite long) text on
> the screen. So while the people are reading along, I have to scroll
> down.
> 
> With previous solutions I just shifted, but it is annoying when the
> content just changes. "Where are we?" So now I scroll the field like
> this:
> 
> on arrowKey deze
>    put the scroll of fld "tekst" into oldScroll
>    switch deze
>    case "down"
>      put oldScroll + 300 into newScroll
>      break
>    end switch
>    repeat with e = oldScroll to newScroll step 5
>      set the scroll of fld "tekst" to e
>    end repeat
> end arrowKey
> 
> This does the job, but not quite smoothly.
> 
> My question is: can this be improved? Are there visual effects that
> can be applied to JUST A PART of a window - to just a field?  Any
> bright ideas to scroll a field up in a nice way? Can I use the Core
> Image capabilities of RunRev on Mac OS X 10.4 for this?
> 
> Terry
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