Scrolling on Mac OS X : groups vs fields

[Alex Tweedly]

Thanks Devin and Mac - that works fine.

-- Alex.
P.S. I'm not sure how I would *ever* have found that in the dictionary / 
User Guide - so thanks again.



On 02/08/2013 17:32, Mac Bennett wrote:
> 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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