Can it be done math-free? If you nest a group inside the scrollable locked group, and set the nested group to a simple "grab me" in a mouseDown or mouseStillDown handler...
~Roger On Thu, Jul 11, 2013 at 2:00 PM, Devin Asay wrote: > Hi all, > > Has anyone worked out a method for drag-scrolling a group? I have a > simple game in which play area may be smaller than the working screenrect > on some screens. I lock the group so that it's always the same size as the > stack window, then I just set the scroll of the group to show part of the > play area that is in view. I've worked out how to do it using the scroll > wheel on the mouse, but I also want to be able to drag the play area around > with the mouse. It's "sort of" working, but is moving very jerkily. > > I'm doing this: > > local sDragging, sMouseV, sMouseH > > on mouseUp > put false into sDragging > end mouseUp > > on mouseRelease > put false into sDragging > end mouseRelease > > on mouseDown > if the height of this stack < the maxHeight of this stack OR \ > the height of this stack < the maxHeight of this stack then > put true into sDragging > else > put false into sDragging > end if > put the mouseV into sMouseV > put the mouseH into sMouseH > end mouseDown > > on mouseMove pNewMouseH, pNewMouseV > if sDragging then > set the hScroll of me to the hScroll of me - (pNewMouseH -sMouseH) > set the vScroll of me to the vScroll of me - (pNewMouseV - sMouseV) > end if > end mouseMove > > My math brain is not very sharp today. Ideas? > > Thanks, > > Devin > > > Devin Asay > Learn to code with LiveCode University > http://university.livecode.com > > > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
