Swipe over native scroller

[J. Landman Gay]

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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