Widget request (native text scroller for iOS)

Scott Morrow scott at elementarysoftware.com
Thu Dec 1 01:03:34 EST 2016

John, I’ve put some pretty complex groups under an iOS scroller and had it work quite well. My problem is that I forget the 

on scrollerDidScroll hOffset, vOffset
  // When the user scrolls move the displayed content
  set the vScroll of group "scrollArea" to vOffset
end scrollerDidScroll

part of the script almost every time and end up scratching my head for a bit. I suppose because desktop fields don’t need this. I figure I only need to scratch my head a few more times and then I’ll start remembering.


> On Nov 30, 2016, at 12:34 PM, J. Landman Gay <jacque at hyperactivesw.com> wrote:
> On 11/30/16 7:35 AM, John Allijn wrote:
>> I can’t get the scroller working
> I haven't had any problem with scrollers on either iOS or Android, barring a specific vScroll bug that's been reported. (http://quality.livecode.com/show_bug.cgi?id=18924)  Aside from that they work very well as long as you follow the instructions here:
> <http://lessons.livecode.com/m/4069/l/94412-creating-a-native-scroller-to-scroll-a-field?id=94412-creating-a-native-scroller-to-scroll-a-field>
> Scrollers are picky, you have to make sure that:
> 1. The full length of the field is displayed. It can't be a scrolling field, it has to be a very tall field at its full height so all content is visible. It's okay if it runs off the window.
> 2. The field must have lockloc set to true.
> 3. The field must be in a group, and generally it's the only thing in the group. The group should be sized to the rectangle you want the user to see. It's lockloc must be set to true.
> 4. For now (until the bug is fixed) the vScroll of the group should be set to 0 when the mobile scroller is created, and the mobile vScroll should also be 0. (A workaround is in the bug report if you want to set the vScroll to something else.)
> I have a simplified handler that creates a mobile scroller which has been working for a long time. The only parameter it needs is the short name of the group that contains the field. (The content of the group doesn't have to be a field, it can be an image or anything else.)
> I find that using names instead of IDs is much easier because you don't have to bother with "the result" or track the reference in a script local. It just works, provided each scrolling group has a unique name. When you want to delete the scroller you can also just use the name. This handler automatically creates a scroller with the same name as the group it is scrolling.
> command createScroller pName
>  if the environment is not "mobile" then exit createScroller
>  deleteMobileControl pName -- custom handler, in case one already exists
>  set the vScroll of control pName to 0 -- init for alignment
>  set the hScroll of control pName to 0
>  mobileControlCreate "scroller", pName
>  mobileControlSet pName, "rect", the rect of control pName
>  put  (0,0,the formattedwidth of control pName,the formattedheight of control pName) into tRect
>  mobileControlSet pName, "contentRect",tRect
>  mobileControlSet pName, "hScroll",0
>  mobileControlSet pName, "vScroll",0
>  mobileControlSet pName, "hIndicator",false
>  mobileControlSet pName, "vIndicator",true
>  mobileControlSet pName, "visible", true
> end createScroller
> This is enough to create a basic scroller. There are other settings you might want to add for iOS, such as the canBounce, etc., and you may want to change the v and h indicator settings. Adding more settings is easy, but the above does the basic work.
> -- 
> Jacqueline Landman Gay         |     jacque at hyperactivesw.com
> HyperActive Software           |     http://www.hyperactivesw.com
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