Hey John,
I had the same problem, I was creating the scrollView before I knew my content height.
FWIW, I’ma newb, so your mileage may vary.
I haven’t migrated to widget 2.0, but for widget-v1, you can set the scrollHeight to the proper size you need “after” the scrollView is created. It couldn’t be done if Corona hadn’t open sourced the widget-v1 code, thank you guys! I had to add my own function to the scrollview widget-v1 to make it happen and so can you.
I can’t believe this feature wasn’t ever implemented. I would think this strategy could be used with widget2.0, but not sure.
Here’s how I did it, it’s quite simple. You need to modify the open source widget module and add it to your project.
In your main.lua or whatever module.lua you are in…
I’m assuming you are spawning your content into a table.
Implement a “Count” variable and for each iteration of your content you spawn to keep track of how large you want your scrollHeight to be.
<code>
local function createDynamicScrollView()
local CatagoryScroll = widgetV1.newScrollView{
hideBackground = true,
width = 420,
height = 300,
left = 0,
top = 50,
scrollWidth = 420,
scrollHeight = 3000, --original scrollHeight doesn’t matter, it will be changed later
friction, .935, --default is .935
--onEvent = onButtonEvent,
bgColor = {255,255,255, 0}, --make transparent here, set value to “0”
maskFile=“CatagoryMask440x300.png”,
--listener = onButtonEvent,
}
print("----------Flag1–CatagoryScrolll.widgetScrollHeight == ", CatagoryScroll.widgetScrollHeight) --should be 3000, the value declared when the scrollview was created. I added the .widgetScrollHeight variable to the scrollView widget-v1 so I could dynamically alter it after it was created.
CatagoryScroll.isHitTestMasked = true
ScrollViewReportsGroup:insert(CatagoryScroll)
– now spawn your content
Count = 0
for i = 1, #table do --table holds your content in this example
Count = Count + 1 --keep track of how many “content lines or spaces you need”
ScrollViewObject[i] = display.newText("table[i].text, 0, 0, “Helvetica”, 18)
ScrollViewObject[i].x = 20
ScrollViewObject[i].y = i * 35
CatagoryScroll:insert(ScrollViewObject[i])
end
print("----------Flag1–CatagoryScroll.widgetScrollHeight == ", CatagoryScroll.widgetScrollHeight)
CatagoryScroll.widgetScrollHeight = (Count * 25) + 80 --here is where you mutiply (Count * whatever spacing you need) to dynamically set the proper scrollHeight you want. In my case, I need 25 pixels for each line and I have 80 pixels worth of text above the dynamically generated content I need to account for.
print("----------Flag2–CatagoryScrolll.widgetscrollHeight == ", CatagoryScroll.widgetScrollHeight) --should display the new value that was just set
CatagoryScroll:changeScrollHeight() --dynamically sets scrollHeight!!! This calls the function I added to the scrollView widget-v1, I’ll show it below.
end
</code>
Here’s how I modified the scrollView widget in widget-v1.
<code>
–@ widget-v1 line 1871, in local function createScrollView( options ) ,I add this variable I can modifiy from the lua module where the dynamic scrollView was created
scrollView.widgetScrollWidth = scrollWidth --I added this variable to dynamically set the scrollWidth value from another module
scrollView.widgetScrollHeight = scrollHeight --I added this variable to dynamically set the scrollHeight value from another module
– then below the " local function createScrollView( options ) " I added this function that destorys the contentBg object (this determines the scrollHeight of the scrollView), and replaces the scrollWidth and scrollHeight orginally declared when the scrollView was created with the new dynamic values and spawns the new contentBg object needed.
–my function to change scrollHeight, warning, I haven’t checked this for memory leaks.
function scrollView:changeScrollHeight() --this function gets called from the last line of my module.lua above
scrollHeight = scrollView.widgetScrollHeight
scrollWidth = scrollView.widgetScrollWidth
print("scrollHeight == ", scrollHeight)
display.remove(contentBg)
contentBg = nil
– create a background for actual content
local contentBg = display.newRect( 0, 0, scrollWidth, scrollHeight )
contentBg:setFillColor( 255, 100 )
contentBg.isVisible = false
content:insert( 1, contentBg )
--contentBg.height = scrollView.widgetScrollHeight
print("contentBg.height == ", contentBg.height) --should print your new dynamically created scrollHeight value 
end
</code>
Nice! Now you have perfectly sized scrollViews that properly display your dynamically created content perfectly which bounces back at the bottom of you content just as a user would expect.
I hope this helps or at least points you in the right direction.
