onContentSizeChange support for growing multiline TextInput

[brentvatne]

Original discussion here: #1229 (comment)

Problem

the onChange event that we depend upon here only fires when a user enters text via a keyboard. This means that if there is more than one line of text loaded in (e.g. resuming a form), the height will be restricted to whatever the default is. Is there any way to trigger (or measure) the contentSize so that we can set an accurate initial height?

Potential solutions

• Fix onChange like @deanmcpherson did in iOS Text - Modify "onChange" behaviour to allow for all changes in contentSize #6283
• "Add a separate onContentSizeChange event which can be observed independently of onTextChange." ([TextInput - Multiline] Reimplemented RCTTextView and added auto height scaling. #1229 (comment)) -- I did this for Android in this commit.

Decision that needs to be made

• Do we push forward with onContentSizeChange? (an aside, see our justification for naming).
• If yes:
  • do we back out of providing layout information in the onChange event from TextInput and just provide it in onContentSizeChange?
  • who will implement this on iOS?

@nicklockwood @deanmcpherson @bestander

[mangogogos]

Any update on this? Most of the relevant issues have gone quiet

[bestander]

I posted internally to get some attention, sorry for the wait.
Meanwhile if this affects you and you want to raise visibility, create an entry in product pains

[holyxiaoxin]

How is onContentSizeChange getting fired? I'm on Android and react-native v0.32.0, multiline is true. I only get onContentSizeChange fired for the first time, after that it doesn't fire even after i'm hitting the next line.

Our application has tons of forms that are paused and resumed at a later date, and currently this issue alone is making react-native a headache for us.

[jayshah123]

Checking on v0.33 rn on android, multiline is true.
I only get onContentSizeChange fired for the first time, after that it doesn't fire even after i'm hitting the next line.

[oargaruna]

Issue reported by @jayshah123 and @holyxiaoxin still persists on v0.34. For now I am using both onChange and onContentSizeChange. The former for Android and the latter for iOS.

[snowjade]

Oh ,I get the same issue too as reported by @jayshah123 and @holyxiaoxin