[gef-dev] Fw: Who wants to fix something?

[Gunnar Wagenknecht <G.Wagenknecht@xxxxxxxxxxxx>]

Hi Randy,

"Randy Hudson" <none@xxxxxxxxxx> schrieb im Newsbeitrag
news:<bp36po$fu7$1@xxxxxxxxxxx>...
> Here's an isolated bugzilla for someone looking to contribute to GEF:
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=44288

Well, I did a few evaluations and I noticed that the Marquee... classes
don't use the auto expose feature. I added it to my implementation and I
also change the auto exposing to be done in #handleDragInProgress and not in
#handleHover. Thus, it scrolls immediately without a wait.


> It involves the class ViewportAutoexposeHelper.
> Basically, we want:

I increased the range and added a 2nd range for a faster scroll speed.
 
> 1) The amount of scrolled pixels to be constant per unit of time.
Currently
> the speed of the computer and complexity of the drawing affect the
> autoscroll speed.

I noticed that but I currently can't see how to achieve this.

> 2) The speed (pixels/second) to be progressive.  This could be
experimented
> with, I'm not convinced this will feel right.  Maybe just 2 speeds, slow
and
> fast, are needed.

Two speeds are really better but I don't think we need more. Even with the 2
speeds it is hard to get a right feeling if you don't have a very large
diagram. Maybe we can change the class so that custom scroll ranges and
speeds are easy to implement?

Cu, Gunnar