Summary:
The `UIManager` already has a lot of responsibilities and is deeply
tied with React Native's view architecture. This diff separates out a
`DeviceInfo` native module to provide information about screen dimensions and
font scale, etc.
Reviewed By: fkgozali
Differential Revision: D4713834
fbshipit-source-id: f2ee93acf876a4221c29a8c731f5abeffbb97974
Summary:
The PR description has been updated to reflect the new approach.
**Breaking Change Summary**
On Android, the following properties now return a different number:
- `Dimensions.get('window').fontScale`
- `Dimensions.get('screen').fontScale`
- `PixelRatio.getFontScale()`
This is a breaking change to anyone who was using these properties because the meaning of these properties has now changed.
These properties used to return a value representing font scale times density ([`DisplayMetrics.scaledDensity`](https://developer.android.com/reference/android/util/DisplayMetrics.html#scaledDensity)). Now they return a value representing just font scale ([`Configuration.fontScale`](https://developer.android.com/reference/android/content/res/Configuration.html#fontScale)).
**PR Description**
This PR changes a few things:
- Correctly exposes the font scale to JavaScript as `Dimensions.get('screen').fontScale`. UIManager was exporting `DisplayMetrics.scaledDensity` under the name `fontScale`. How
Closes https://github.com/facebook/react-native/pull/11008
Differential Revision: D4558207
Pulled By: astreet
fbshipit-source-id: 096ce7b28051325dfd45fdb2a14b5e9b7d3bc46f
Summary:
public
KeyboardListener needs DisplayMetrics to be initialized when it is attached. At
the moment, this breaks easily whenever we change these components, since DisplayMetrics are intialized
in a module and KeyboardListener is created eagerly in ReactRootView, whereas
ReactRootView can exist without the instance.
This changes to create DisplayMetrics as soon as possible, when the react
instance is built. The KeyboardListener is created and attached after the ReactRootView is
attached to an existing instance, point at which DisplayMetrics have to be
initialized.
Reviewed By: dmmiller
Differential Revision: D2911351
fb-gh-sync-id: 64d1805c5d5b2f6876adb694b565a2df059b381d
Summary: public
We're seeing related crashes. The diff has no tests, the perf tests weren't conclusive, and the person who'd be supporting it no longer is available to work on it. We can try this again later in a less rushed manner with proper perf testing.
Reviewed By: davidaurelio
Differential Revision: D2696615
fb-gh-sync-id: 3b6814ac12af19516146d5c42d2add8321b10db5
Summary: public
Native view recycling implementation based on limited pools of views.
In this diff I introduced new UIManager method: dropViews. Instead of removing views from tag->view maps when they are detached we keep them there until we get a call to dropViews with the appropriate tag. JS may keep a pool of object and selectively decide not to enqueue drop for certain views. Then instead of removing those views it may decide to reuse tag that has been previously allocated for a view that is no longer in use.
Special handling is required for layout-only nodes as they only can transition from layout-only to non-layout-only (reverse transition hasn't been implemented). Because of that we'd loose benefits of view flattening if we decide to recycle existing non-layout-only view as a layout-only one.
This diff provides only a simple and manual method for configuring pools by calling `ReactNativeViewPool.configure` with a dict from native view name to the view count. Note that we may not want recycle all the views (e.g. when we render mapview we don't want to keep it in memory after it's detached)
Reviewed By: davidaurelio
Differential Revision: D2677289
fb-gh-sync-id: 29f44ce5b01db3ec353522af051b6a50924614a2
This is an early release and there are several things that are known
not to work if you're porting your iOS app to Android.
See the Known Issues guide on the website.
We will work with the community to reach platform parity with iOS.
