Summary:
They keyboard module is an instance of `NativeEventEmitter` which is an instance of `EventEmitter`. But the exported module only has a small subset of the APIs. This broke existing codebases which are using the methods not exported currently.
The PR just reassigns the variable before exporting so that the actual module is exported instead of the dummy object used for documentation. It also fixes a layout issue in the documentation.
Closes https://github.com/facebook/react-native/pull/10671
Differential Revision: D4110355
fbshipit-source-id: a6757f3ca8c2494970ba221b10a7e6e9a5f2d64d
Summary:
There is no "window" in react native. And by the way fix the indent.
Closes https://github.com/facebook/react-native/pull/10182
Differential Revision: D3974090
Pulled By: javache
fbshipit-source-id: e0e47e15364abff5bcb136d988e234fc8e1f0a8b
Summary:
Simple and elegant. Now someone can dismiss a keyboard in a way that makes sense.
```js
import { Keyboard } from 'react-native'
// Hide that keyboard!
Keyboard.dismiss()
```
+ docs
Closes https://github.com/facebook/react-native/pull/9925
Differential Revision: D3935357
fbshipit-source-id: ecd2fb5c72c4dd769951d308e9bb6ee5d888052a
Summary:
This is a solution for the problem I raised in https://www.facebook.com/groups/react.native.community/permalink/768218933313687/
I've added a new native base class, `RCTEventEmitter` as well as an equivalent JS class/module `NativeEventEmitter` (RCTEventEmitter.js and EventEmitter.js were taken already).
Instead of arbitrary modules sending events via `bridge.eventDispatcher`, the idea is that any module that sends events should now subclass `RCTEventEmitter`, and provide an equivalent JS module that subclasses `NativeEventEmitter`.
JS code that wants to observe the events should now observe it via the specific JS module rather than via `RCTDeviceEventEmitter` directly. e.g. to observer a keyboard event, instead of writing:
const RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
RCTDeviceEventEmitter.addListener('keyboardWillShow', (event) => { ... });
You'd now write:
const Keyboard = require('Keyboard');
Keyboard.addListener('keyboardWillShow', (event) => { ... });
Within a component, you can also use the `Subscribable.Mixin` as you would previously, but instead of:
this.addListenerOn(RCTDeviceEventEmitter, 'keyboardWillShow', ...);
Write:
this.addListenerOn(Keyboard, 'keyboardWillShow', ...);
This approach allows the native `RCTKeyboardObserver` module to be created lazily the first time a listener is added, and to stop sending events when the last listener is removed. It also allows us to validate that the event strings being observed and omitted match the supported events for that module.
As a proof-of-concept, I've converted the `RCTStatusBarManager` and `RCTKeyboardObserver` modules to use the new system. I'll convert the rest in a follow up diff.
For now, the new `NativeEventEmitter` JS module wraps the `RCTDeviceEventEmitter` JS module, and just uses the native `RCTEventEmitter` module for bookkeeping. This allows for full backwards compatibility (code that is observing the event via `RCTDeviceEventEmitter` instead of the specific module will still work as expected, albeit with a warning). Once all legacy calls have been removed, this could be refactored to something more elegant internally, whilst maintaining the same public interface.
Note: currently, all device events still share a single global namespace, since they're really all registered on the same emitter instance internally. We should move away from that as soon as possible because it's not intuitive and will likely lead to strange bugs if people add generic events such as "onChange" or "onError" to their modules (which is common practice for components, where it's not a problem).
Reviewed By: javache
Differential Revision: D3269966
fbshipit-source-id: 1412daba850cd373020e1086673ba38ef9193050
James Ide
sunnylqm
Gant Laborde
Nick Lockwood