Mouse messages in scrollers

J. Landman Gay jacque at hyperactivesw.com
Tue May 19 19:41:52 EDT 2020


I'm doing something very similar but the problem is that I don't get any 
mouse or touch messages at all, which is why I'm thinking it must be the 
settings for my ios scroller.

Whatever the defaults are for delayTouches and canCancelTouches, I think at 
least one of them needs to be changed.

--
Jacqueline Landman Gay | jacque at hyperactivesw.com
HyperActive Software | http://www.hyperactivesw.com
On May 19, 2020 5:39:07 PM scott--- via use-livecode 
<use-livecode at lists.runrev.com> wrote:

> 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!)
>> web       https://elementarysoftware.com/
>> 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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>>
>>
>>
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