scrollView problem with :setScrollHeight( newHeight )

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#1

CoronaSDK 2013.2097

Graphics 2.0 mode

This happens after graphics 2.0 update.

  1. When I run scrollViewObj:scrollHeight( newHeight ). It reset scroll position Y to zero. even if I moving scrollView.

2. scrollTo(‘bottom’, {time=…}) works abnormal.

It scrolls to center of scroll view. not bottom.

scrollTo(‘top’, …) works normal.

  1. scrollViewObj:scrollTo( … ) does not stops moving of scrollView.
#2

Hi there,

Could you please provide some code, to be able to determine what the issue is?

Thanks,

Alex

#3

Hi, Alex.

This is sample code

-- Sample code (screen size 960x640, landscape mode) local widget = require 'widget' local scrollViewHeight = 495 -- make scrollView local scrollView = widget.newScrollView{     left=60, top=60,     -- 770x495     width=770, height=scrollViewHeight,     scrollWidth=770, scrollHeight=scrollViewHeight,     hideBackground = false,     backgroundColor = {0.2,0.2,0.2},     isHitTestMasked = true,     horizontalScrollDisabled = true,     maskFile = "images/mask/400x400.png" } scrollView.maskScaleX = 770/400 scrollView.maskScaleY = scrollViewHeight/400      -- texts local textGroup = display.newGroup() local textLines = 50 for i = 1, textLines do     local text = display.newText{ parent=textGroup, text = 'Hello Corona. '..i, fontSize=21}     text.x, text.y = 0, i\*22 end scrollView:insert( textGroup ) textGroup.x, textGroup.y = 100, 100 -- scrollToBottom button local bottomBtn = display.newRect( 0,0, 100, 20 ) bottomBtn.x, bottomBtn.y = 480, 620 bottomBtn:addEventListener('touch', function(e)     if e.phase == 'began' then         -- \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*         -- \*\*\*\*\*\* weird scroll position \*\*\*\*\*\*\*         -- \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*         scrollView:scrollTo('bottom', {time=100})     end end) -- delayed contents height changing (set random height to show what happens) timer.performWithDelay(2000, function()     local randomHeight = textGroup.height + math.random(1, 100)     print('randomHeight: '..randomHeight)     -- \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*     -- \*\*\*\*\* this forces scroll to top \*\*\*\*     -- \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*     scrollView:setScrollHeight( randomHeight ) end, 0)  

Best regards.

#4

I also have the same problem when I reset ScrollHeight  :huh:

scrollView:setScrollHeight( scrollViewHeight )
#5

@zetaloki4, Captured this one in the “unofficial” widgets bug list. Please report back when its fixed. Thanks much!!!

#6

Is there a bug report for this bug?  If so  can you post the number here for a reference?  If not, please file one.

Thanks

Rob

#7

Hi there,

Could you please provide some code, to be able to determine what the issue is?

Thanks,

Alex

#8

Hi, Alex.

This is sample code

-- Sample code (screen size 960x640, landscape mode) local widget = require 'widget' local scrollViewHeight = 495 -- make scrollView local scrollView = widget.newScrollView{     left=60, top=60,     -- 770x495     width=770, height=scrollViewHeight,     scrollWidth=770, scrollHeight=scrollViewHeight,     hideBackground = false,     backgroundColor = {0.2,0.2,0.2},     isHitTestMasked = true,     horizontalScrollDisabled = true,     maskFile = "images/mask/400x400.png" } scrollView.maskScaleX = 770/400 scrollView.maskScaleY = scrollViewHeight/400      -- texts local textGroup = display.newGroup() local textLines = 50 for i = 1, textLines do     local text = display.newText{ parent=textGroup, text = 'Hello Corona. '..i, fontSize=21}     text.x, text.y = 0, i\*22 end scrollView:insert( textGroup ) textGroup.x, textGroup.y = 100, 100 -- scrollToBottom button local bottomBtn = display.newRect( 0,0, 100, 20 ) bottomBtn.x, bottomBtn.y = 480, 620 bottomBtn:addEventListener('touch', function(e)     if e.phase == 'began' then         -- \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*         -- \*\*\*\*\*\* weird scroll position \*\*\*\*\*\*\*         -- \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*         scrollView:scrollTo('bottom', {time=100})     end end) -- delayed contents height changing (set random height to show what happens) timer.performWithDelay(2000, function()     local randomHeight = textGroup.height + math.random(1, 100)     print('randomHeight: '..randomHeight)     -- \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*     -- \*\*\*\*\* this forces scroll to top \*\*\*\*     -- \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*     scrollView:setScrollHeight( randomHeight ) end, 0)  

Best regards.

#9

I also have the same problem when I reset ScrollHeight  :huh:

scrollView:setScrollHeight( scrollViewHeight )
#10

@zetaloki4, Captured this one in the “unofficial” widgets bug list. Please report back when its fixed. Thanks much!!!

#11

Is there a bug report for this bug?  If so  can you post the number here for a reference?  If not, please file one.

Thanks

Rob