[plt-scheme] scrolling inside an editor-snip?

From: Robby Findler (robby at cs.uchicago.edu)
Date: Wed Oct 3 08:39:46 EDT 2007

You might be able to do something with the set-view method of the
editor-snip%'s admin, but you'd be implementing your own scroll bars,
I'm sorry to say.


On 10/2/07, harsha <harsha.v.r at gmail.com> wrote:
> hi, i have a question about a editor-snip% class in mred   one of the
> requirements in my program's interface is to have little editor-boxes
> in a canvas with edges between them, the user should be able to enter
> text into the these boxes, i use editor-snip% with the graph-snip
> mixin to draw the edges. the edges work out pretty well, my problem is
> with the editor-snips themselves.
> the problem is that when the text entered exceeds the snip's size the
> cursor just disappears, one can still type and it will be stored in
> the editor's value field, but one can't see what one is typing.
> when this happens in other mind mapping programs like kdissert, a
> scrollbar appears inside the editor-snip and one can keep typing while
> seeing what you type
> what is the easiest way in which i can implement this functionality?
> has anyone implemented a custom editor-snip widget class with
> scrolling capability?
> if not, what would i need to do to implement this, there are functions
> in the editor snip% class which return the number of scroll-steps and
> the height of each step, but there are no functions to actually start
> displaying text from a certain scroll-step.
> thanks,
> harsha
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