Mouse messages in scrollers

[scott at elementarysoftware.com]

Of course I forgot to declare the local and global variables...

global gHorizontalSwipeDistance
global gVerticalSwipeDistance
local lMouseStartV
local lMouseStartH

> On May 19, 2020, at 3:20 PM, scott--- via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> I’m using this script on iOS directly inside a LC field object in order to get a "delete button” to appear. (Ya, I know that is pretty ancient UI) But it requires a swipe on iOS which is what you are after. I don’t think it is responsive enough to do some of the fancy pushes that differentiate between showing and sending things. It has been a long time since I worked on this (and I chopped out a lot of code) so it is possible that I’ve missed something. FYI: the field is a “List” field.
> 
> 
> -- I use these values for swiping
> put 40 into gHorizontalSwipeDistance
> put 15 into gVerticalSwipeDistance
> 
> -- I'm assuming the list behavior of the field needs to be true
> -- field script
> 
> on touchStart pID
>   put the mouseV into lMouseStartV
>   put the mouseH into lMouseStartH
>   -- some actions night need to go here
> end touchStart	
> 
> 
> on touchMove pTouchID, pTouchH, pTouchV 
>   -- see if there was a swipe for delete
>   if ((abs(pTouchH - lMouseStartH) > gHorizontalSwipeDistance)) AND\
>   (abs(pTouchV - lMouseStartV) < gVerticalSwipeDistance) then
>      -- they swiped
>      --  unhilite the line
>      set the hilitedLine of fld "ScrollingList" of cd "ListOfLists" to empty
>     -- do stuff here
> end touchMove
> 
> 
> on touchRelease pID
>   -- unhilite the line
>   set the hilitedLine of fld "ScrollingList" of cd "ListOfLists" to empty
> end touchRelease
> 
> —
> Scott Morrow
> 
> Elementary Software
> (Now with 20% less chalk dust!)
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> email     scott at elementarysoftware.com
> booth    1-800-615-0867
> ------------------------------------------------------
> 
> 
>> On May 19, 2020, at 2:21 PM, J. Landman Gay via use-livecode <use-livecode at lists.runrev.com> wrote:
>> 
>> I have a tall field inside a shorter group that uses a mobile scroller. A behavior assigned to the group handles the scrolling and checks for swipes by capturing mouseDown and mouseUp to determine touch locations so it can calculate the direction of the swipe. This works on Android.
>> 
>> On iOS I do not get mouseUp or mouseDown messages when swiping horizontally, though I do get scrolerDidScroll when swiping vertically. But since the group is exactly as wide as the field it encloses, it does not scroll horizontally and so no scrollerDidScroll message is sent. I also do not get scrollerBegin/EndDrag, touchStart or touchEnd, or any other message I can think of to track a horizontal swipe. I do get mouseUp/Down when tapping on the scroller but that doesn't help here.
>> 
>> How would I detect a horizontal swipe on a non-moving scroller? The user can't navigate without it.
>> 
>> -- 
>> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
>> HyperActive Software           |     http://www.hyperactivesw.com
>> 
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