I'm sure you could implement this with your own canvas and `editor-admin%' classes.
It may be possible to implement this with the existing `editor-canvas%' class, but probably not. If `scroll-to' in `editor-canvas%' could really be overridden, for example, that might get close; the layer at which you can override `scroll-to', however, is not the layer where the canvas's editor admin calls `scroll-to' (i.e., there's a layer of indirection in the implementation). If you'd like to try changing the `editor-canvas%' implementation, the code is in "collects/mred/private/wxme". You may also need to change something in the `editor-canvas%' wrapper layer, which is "collects/mred/mrcanvas.rkt". At Sun, 30 Oct 2011 20:44:38 +0000, Erich Rast wrote: > Is it possible to (halfway easily) implement "typewriter" scrolling on > the basis of an editor-canvas% and text%. I've discovered > scroll-with-bottom-base which already goes in the right direction. Now > here is what I'm looking for: > > - Editing always takes place on the same line, the edit line, whose > location is user-definable e.g. as the 20th line from the topmost > visible line or x pixels from the top or bottom of the editor canvas. > > - Scrolling up: the cursor stays on the edit line and the text around it > scrolls down a line. (So part of the text might show up below the edit > line.) > > - Scrolling down: the cursor stays on the edit line and the text around > it moves up a line (if there is more text below the edit line.) > > - Editing: like scroll-with-bottom-base but on the user-defined edit > line (usually somewhere in the middle of third half of the canvas, but > must be definable somehow) > > Is this possible? Any ideas how? Are there some internal classes I could > modify? > > > Best, > > Erich > > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
