Swipe over native scroller

JJS jjs at krutt.org
Thu Jan 31 12:30:39 EST 2019 

Could it be somehow that your problem is linked to this issue?:

https://quality.livecode.com/show_bug.cgi?id=21555

Because the scrollerID is constantly changing with native scroll


Op 31-1-2019 om 19:02 schreef J. Landman Gay via use-livecode:
> Yeah, I think it also works if the swipe ends outside the scroller but 
> our project design doesn't really lend itself to a narrower text 
> field. Or do you mean that the scroller is narrower than the field it 
> controls? I hadn't thought of that.
>
> -- 
> Jacqueline Landman Gay | jacque at hyperactivesw.com
> HyperActive Software | http://www.hyperactivesw.com
> On January 31, 2019 11:43:38 AM Jim MacConnell via use-livecode 
> <use-livecode at lists.runrev.com> wrote:
>
>> The only way I've been able to get swipe functionality with a native
>> scroller is to keep the native scroller narrower than the screen by 
>> enough
>> that someone swiping is able to easily start the swipe on the 
>> background.
>> I've found when people try to swipe and it doesn't work, they'll try 
>> again
>> starting closer to the edge of the screen.... which I can trap.
>>
>> Definitely not ideal but it's all I've been able to come up with since I
>> don't really want to have to code bounce, etc.
>>
>> -----Original Message-----
>> From: use-livecode <use-livecode-bounces at lists.runrev.com> On Behalf 
>> Of J.
>> Landman Gay via use-livecode
>> Sent: Thursday, January 31, 2019 9:04 AM
>> To: How to use LiveCode <use-livecode at lists.runrev.com>
>> Cc: J. Landman Gay <jacque at hyperactivesw.com>
>> Subject: Re: Swipe over native scroller
>>
>> That's similar to the handlers I'm using but they all fail because no
>> mouseUp or touchEnd messages are ever sent if you are over a native
>> scroller. The issue isn't with the calculations, it's because the app is
>> never informed thar the swipe has completed.
>>
>> I'll try fiddling with touchMove again, but the message isn't sent
>> consistently on slow hardware and sometimes fails.
>>
>> -- 
>> Jacqueline Landman Gay | jacque at hyperactivesw.com HyperActive Software |
>> http://www.hyperactivesw.com On January 31, 2019 7:20:38 AM Sannyasin
>> Brahmanathaswami via use-livecode <use-livecode at lists.runrev.com> wrote:
>>
>>> Did you try Terry script? Elanor did something similar this in the
>>> Listen module, it not very refined. Terry put time in it with subtle
>>> time parameters. I have yet to try it. It here on the list
>>>
>>> Terry, do we have a place for a repository for code snippits? Maybe
>>> you can put in on the forum.
>>>
>>> I don't think  you are going to get response to the bug problem. I
>>> have been trying to get smooth scrolling for 3 years!  I think it is
>>> more a question of something deep in the engine that "can't be done",
>>> at least not cross platform. Otherwise they would have responded by 
>>> now.
>>>
>>> Here's Terry code from Dec. 20...Terry.... have improved it?
>>>
>>> ===========
>>> Terry:
>>> So, it seems like this approach works ok. Turned out there was an
>>> addition complication in that the items in my scrolling list are also
>>> selectable and I needed to prevent them being toggled on or off during
>>> a left/right swipe action. Anyway, this is what I ended up doing...
>>>
>>> In the card script...
>>>
>>> local pLoc, pTime, pV, pScroll
>>>
>>> on touchStart pTouchID
>>>   put the mouseLoc into pLoc
>>>   put the millisecs into pTime
>>>   put the scroll of grp "checkList" into pScroll
>>>   put the mouseV into pV
>>> end touchStart
>>>
>>> on touchMove pTouchID, pTouchX, pTouchY
>>>   put pV-pTouchY into tY
>>>   put pScroll+tY into tScroll
>>>   set the scroll of grp "checkList" to tScroll end touchMove
>>>
>>> on touchEnd pTouchID
>>>   put the mouseLoc into pLoc1
>>>   put (item 1 of pLoc)-(item 1 of pLoc1) into tX
>>>   put (item 2 of pLoc)-(item 2 of pLoc1) into tY
>>>   put the millisecs - pTime into tElapsed
>>>   if abs(tX)>100 then # horizontal swipe
>>>      if abs(tY)< 50 then # small vertical movement
>>>         if tElapsed < 500 then # not too slow
>>>            if tX > 0 then
>>>               send "mouseUp" to grp "nextBtn"
>>>            else
>>>               send "mouseUp" to grp "backBtn"
>>>            end if
>>>         end if
>>>      end if
>>>   end if
>>> end touchEnd
>>>
>>> And in the "checklist" script...
>>>
>>> local pX
>>>
>>> on mouseDown
>>>   put the mouseH into pX
>>> end mouseDown
>>>
>>> on mouseUp
>>>   if abs((the mouseH)-pX) > 50 then exit mouseUp
>>>   # list selection code
>>> end mouseUp
>>>
>>> BR
>>>
>>>
>>> ?On 1/30/19, 7:17 PM, "use-livecode on behalf of J. Landman Gay via
>>> use-livecode" <use-livecode-bounces at lists.runrev.com on behalf of
>>> use-livecode at lists.runrev.com> wrote:
>>>
>>>    Thanks, I was afraid of that. I'll see if I can bump the bug 
>>> report for
>>>    attention.
>>>
>>>    On 1/30/19 5:49 PM, Terry Judd via use-livecode wrote:
>>>> Not much of a workaround I'm afraid, but for a recent app (iOS and
>>>> Android) I got rid of the native scroller and used the touch messages
>>>> to both scroll the object and detect the swipes.
>>>> Terry...
>>>
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>>
>>
>>
>>
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