Janic Duplessis 2537157d99 Implement TextInput onContentSizeChange
Summary:
This adds proper support for tracking a TextInput content size as discussed in #6552 by adding a new callback that is called every time the content size changes including when first rendering the view.

Some points that are up for discussion are what do we want to do with the onChange callback as I don't see any use left for it now that we can track text change in onChangeText and size changes in onContentSizeChange. Also a bit off topic but should we consider renaming onChangeText to onTextChange to keep the naming more consistent (see [this naming justification](https://twitter.com/notbrent/status/709445076850597888)).

This is split in 2 commits for easier review, one for iOS and one for android.

The iOS implementation simply checks if the content size has changed everytime we update it and fire the callback, the only small issue was that the content size had several different values on initial render so I added a check to not fire events before the layoutSubviews where at this point the value is g
Closes https://github.com/facebook/react-native/pull/8457

Differential Revision: D3528202

Pulled By: dmmiller

fbshipit-source-id: fefe83f10cc5bfde1f5937c48c88b10408e58d9d
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UIExplorer

The UIExplorer is a sample app that showcases React Native views and modules.

Running this app

Before running the app, make sure you ran:

git clone https://github.com/facebook/react-native.git
cd react-native
npm install

Running on iOS

Mac OS and Xcode are required.

  • Open Examples/UIExplorer/UIExplorer.xcodeproj in Xcode
  • Hit the Run button

See Running on device if you want to use a physical device.

Running on Android

You'll need to have all the prerequisites (SDK, NDK) for Building React Native installed.

Start an Android emulator (Genymotion is recommended).

cd react-native
./gradlew :Examples:UIExplorer:android:app:installDebug
./packager/packager.sh

Note: Building for the first time can take a while.

Open the UIExplorer app in your emulator.

See Running on Device in case you want to use a physical device.

Running with Buck

Follow the same setup as running with gradle.

Install Buck from here.

Run the following commands from the react-native folder:

./gradlew :ReactAndroid:packageReactNdkLibsForBuck
buck fetch uiexplorer
buck install -r uiexplorer
./packager/packager.sh

Note: The native libs are still built using gradle. Full build with buck is coming soon(tm).

Built from source

Building the app on both iOS and Android means building the React Native framework from source. This way you're running the latest native and JS code the way you see it in your clone of the github repo.

This is different from apps created using react-native init which have a dependency on a specific version of React Native JS and native code, declared in a package.json file (and build.gradle for Android apps).