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sluggish scroller [Solved]
Posted: Sun Dec 20, 2015 11:07 am
by Jellobus
Hello
I always noticed when a native scroller is created and start to scroll, the first scrolling is not smooth and sluggish until the all contents (images, texts) are revealed. I tried
Code: Select all
on preOpenCard
prepare image file "FILENAME of all content images"
end preOpenCard
but there was no performance improvement.. Is anyone know how to increase the performance of the scroller?
Re: sluggish scroller
Posted: Sun Dec 20, 2015 12:33 pm
by Dixie
On iOS or Android... ?
Would you like to post your code ?
Re: sluggish scroller
Posted: Sun Dec 20, 2015 4:10 pm
by Jellobus
Hi Dixie,
The issue found on Android.
The stack was originally built with LC 6.5.2. It was working fine back then but I found the scroller sluggish once the stack was deployed with the latest LC 6.7.8 (rc4).
the code is here.
Code: Select all
on preOpenStack
set the acceleratedRendering of this stack to true
end preOpenStack
on setScroller
if the environment is "mobile" then
put the rect of group "Scroll" of this card into tScrollerRect
put 0,0,400,2249 into tContentRect
mobileControlCreate "scroller", "GroupScroll"
put the result into sScrollerID
mobileControlSet "GroupScroll", "rect", tScrollerRect
mobileControlSet "GroupScroll", "contentRect", tContentRect
mobileControlSet "GroupScroll", "visible", true
mobileControlSet "GroupScroll", "vIndicator", true
mobileControlSet "GroupScroll", "vscroll", 0
end if
end setScroller
on scrollerDidScroll hOffset, vOffset
lock screen
set the vScroll of group "Scroll" to vOffset
unlock screen
end scrollerDidScroll
Re: sluggish scroller
Posted: Sun Dec 20, 2015 5:49 pm
by Dixie
Hi...
Your code looks fine to me... but you don't need to use 'lock screen' in your 'scrollerDidScroll' handler... taking out the 'lock screen' statements, does that make a difference ?, I think it should as this handler scrolls continually whilst scrolling...
dixie
Re: sluggish scroller
Posted: Mon Dec 21, 2015 2:31 am
by Jellobus
Hi Dixie,
I tried without lock screen but the result was same. The stack was originally built with LC 6.5.2 so I am thinking rebuild a complete replica of the current stack with the latest LC 6 or 7 version. Complete rebuilding can be just waste of time but I don't see many other options.
I will let you know if there is any performance improvement. Thanks.
Louis
Re: sluggish scroller
Posted: Mon Dec 21, 2015 11:02 am
by Jellobus
Hi Dixie,
The issue has been fixed!
I just set the resizeQuality of images in the scroller to "Good" from "best". Scrolling is very smooth and the image quality in "good" is not bad. Thanks for your advice.
Cheers,
Louis
Re: sluggish scroller [Solved]
Posted: Mon Dec 21, 2015 12:35 pm
by Klaus
...
set the resizeQuality of img 1 to "not bad"
...
I like that!