Scrolling on Mac OS X : groups vs fields

[Mac Bennett]

This works for me, though you might need to adjust 'tStepsize':

--in group script

on  rawKeyDown pKey
  if the short name of me is not in the long name of target  then
      pass rawkeydown
   else
   put 45 into tStepSize -- adjust here the stepsize for scrolling
   switch pKey
      case "65309" -- scroll up 
         set the vscroll of me to the vscroll of me - tStepSize
         break
      case "65308" -- scroll down 
         set the vscroll of me to the vscroll of me + tStepSize
         break
   end switch
end if
pass rawkeydown
end rawKeyDown

(In light of the recent copyright discussion going on here, I would like to disclose that I 'borrowed' this entirely a few years ago, and can't remember where;  so apologies and thanks to the actual author.)

There are also a few similar examples in the "rawkeydown/up" entries in the Livecode Dictionary.

Mac


On Aug 2, 2013, at 10:53 AM, Devin Asay <devin_asay at byu.edu> wrote:

> Alex
> On Aug 2, 2013, at 2:43 AM, Alex Tweedly wrote:
> 
>> On OSX (10.8.4, MBP - but I doubt that matters), I can scroll using a two-finger touch (i.e. if the cursor is within an area that is scrollable, then generally I can touch with two fingers, and 'push up' or 'pull down' the window contents.
>> 
>> This includes LC fields - this scrolling "just works" for them.
>> 
>> If I create a group, set and lock its position and give it a scrollbar, then it gets the scrollbar, and all the traditional behaviour associated with that (i.e. the scrollbar can be dragged, etc.)
>> 
>> But it doesn't automatically get the two-finger touch behaviour.
>> 
>> Is there some way I can enable that ? Do I need to program this myself ?
>> 
>> It looks as though the "touchStart, touchEnd, etc. are implemented on mobile only, so I'm not sure where to start.
> 
> I believe you have to handle scroll wheel actions using rawKeyDown or rawKeyUp (I forget which, and I'm not in a place I can check right now.) Just figure out which codes get sent when the scroll wheel is used and set the scroll of the group in your handler.
> 
> HTH
> 
> Devin
> 
> 
> Devin Asay
> Office of Digital Humanities
> Brigham Young University
> 
> 
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