react-native/Libraries/Text/VirtualText
Valentin Shergin 2716f53220 The New <Text> on iOS
Summary:
This is a complete rewrite of RCTText, the part of React Native which manages Text and TextInput components.

Key points:

* It's understandable now. It follows a simple architectural pattern, and it's easy to debug and iterate. Text flow layout is a first-class citizen in React Native layout system now, not just a wired special case. It also brings entirely new possibilities such as nested interleaving <Text> and <View> components.
* All <Text>-specific APIs were removed from UIManager and co (it's about ~16 public methods which were used exclusively only by <Text>).
* It relies on new Yoga measurement/cloning API and on-dirty handler. So, it removes built-in dirty propagation subsystem from RN completely.
* It caches string fragments properly and granularly on a per-node basis which makes updating text-containing components more performant.
* It does not instantiate UIView for virtual components which reduces memory utilization.
* It drastically improves <TextInput> capabilities (e.g. rich text inside single line <TextInput> is now supported).

Screenshots:
https://cl.ly/2j3r1V0L0324
https://cl.ly/3N2V3C3d3q3R

Reviewed By: mmmulani

Differential Revision: D6617326

fbshipit-source-id: 35d4d81b35c9870e9557d0211c0e934e6072a41e
2018-01-24 00:03:01 -08:00
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RCTVirtualTextShadowView.h The New <Text> on iOS 2018-01-24 00:03:01 -08:00
RCTVirtualTextShadowView.m The New <Text> on iOS 2018-01-24 00:03:01 -08:00
RCTVirtualTextViewManager.h The New <Text> on iOS 2018-01-24 00:03:01 -08:00
RCTVirtualTextViewManager.m The New <Text> on iOS 2018-01-24 00:03:01 -08:00