On 7/23/06, Em Te <[EMAIL PROTECTED]> wrote:
Good day, I am using Scriptaculous' drag and drop library in my project and I find that if I have more than 4 Droppables on a page that contains many nested elements, the motion of any draggable seem to be bumpy instead of smooth.
There has been a lot of talk about this lately on the Yahoo! UI mailing list. The Yahoo! solution was to cache the positions at the start of the drag. This could still cause trouble when scrolling elements are involved and they automatically scroll during the drag. No matter what, a scheme that uses coordinates to determine whether or not the cursor is over a droppable during a drag will always get slower as the number of droppables grows. I discovered a novel solution that doesn't get slower regardless of the number of droppables because it uses native browser events to determine when a draggable is over a droppable. I have an article about it and a proof of prinicple demo on my blog http://peter.michaux.ca/articles/2006/06/16/donut-dragdrop By using native browser events, you also get the expected behavior for activating the appropriate droppable when nested and overlapping droppables exisit. This is something I haven't seen handled well in any dragdrop implementation i've tried. Peter _______________________________________________ Rails-spinoffs mailing list Rails-spinoffs@lists.rubyonrails.org http://lists.rubyonrails.org/mailman/listinfo/rails-spinoffs
