Widget request (native text scroller for iOS)
J. Landman Gay
jacque at hyperactivesw.com
Wed Nov 30 21:34:32 CET 2016
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:
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
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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