Summary:
public
React Native currently exposes the iOS layer shadow properties more-or-less directly, however there are a number of problems with this:
1) Performance when using these properties is poor by default. That's because iOS calculates the shadow by getting the exact pixel mask of the view, including any tranlucent content, and all of its subviews, which is very CPU and GPU-intensive.
2) The iOS shadow properties do not match the syntax or semantics of the CSS box-shadow standard, and are unlikely to be possible to implement on Android.
3) We don't expose the `layer.shadowPath` property, which is crucial to getting good performance out of layer shadows.
This diff solves problem number 1) by implementing a default `shadowPath` that matches the view border for views with an opaque background. This improves the performance of shadows by optimizing for the common usage case. I've also reinstated background color propagation for views which have shadow props - this should help ensure that this best-case scenario occurs more often.
For views with an explicit transparent background, the shadow will continue to work as it did before ( `shadowPath` will be left unset, and the shadow will be derived exactly from the pixels of the view and its subviews). This is the worst-case path for performance, however, so you should avoid it unless absolutely necessary. **Support for this may be disabled by default in future, or dropped altogether.**
For translucent images, it is suggested that you bake the shadow into the image itself, or use another mechanism to pre-generate the shadow. For text shadows, you should use the textShadow properties, which work cross-platform and have much better performance.
Problem number 2) will be solved in a future diff, possibly by renaming the iOS shadowXXX properties to boxShadowXXX, and changing the syntax and semantics to match the CSS standards.
Problem number 3) is now mostly moot, since we generate the shadowPath automatically. In future, we may provide an iOS-specific prop to set the path explicitly if there's a demand for more precise control of the shadow.
Reviewed By: weicool
Differential Revision: D2827581
fb-gh-sync-id: 853aa018e1d61d5f88304c6fc1b78f9d7e739804
Summary: * allowFontScaling false was still changing lineHeight as if it were true
fixes#2783
Closes https://github.com/facebook/react-native/pull/3840
Reviewed By: svcscm
Differential Revision: D2615710
Pulled By: nicklockwood
fb-gh-sync-id: 7e4205c58967640762deb5837ecaa2dde236782c
Summary: public
Do not set a default backgroundColor of white when top-level RCTShadowText has
backgroundColor == nil.
Reviewed By: nicklockwood
Differential Revision: D2605636
fb-gh-sync-id: f2076d302e7ed574f7804080ccc80db1c9b9401c
Summary: public
Added opacity property to RCTShadowText, and use it to adjust the alpha
color component of nested text nodes when collapsing the RCTShadowText tree
into an NSAttributedString. The opacity is propagated down the tree,
multiplying the aggregate with the current node's opacity at each step. Also,
foreground and background colors are propagated down the tree so that in case
a node has an opacity style but no colors, the ancestor's colors can be used
when adjusting the alpha components.
Reviewed By: nicklockwood
Differential Revision: D2600402
fb-gh-sync-id: 2adb7b598b0a73c984bb2edaab545c02ab911c6b
Summary: public
Added lightweight genarics annotations to make the code more readable and help the compiler catch bugs.
Fixed some type bugs and improved bridge validation in a few places.
Reviewed By: javache
Differential Revision: D2600189
fb-gh-sync-id: f81e22f2cdc107bf8d0b15deec6d5b83aacc5b56
Summary: Corrected computation of RCText element height with padding (padding was counted twice).
See also issue #2466.
Closes https://github.com/facebook/react-native/pull/2838
Reviewed By: @svcscm
Differential Revision: D2535924
Pulled By: @nicklockwood
fb-gh-sync-id: b9527803c0a5a6eed1db7e37c98b628750ab2045
Summary: @public
This diff implements inline image support for <Text> nodes. Images are specified using <Image> tags, however all properties of the image are currently ignored apart from the source (including width/height styles).
Images are loaded asyncronously, and will trigger a text re-layout when they have loaded.
Reviewed By: @javache
Differential Revision: D2507725
fb-gh-sync-id: 59d0696d00a1bc531915cc35242a16b2dec96e85
Summary:
Dynamic Text Sizes for Text component.
Text gains new prop - allowFontScaling (false by default).
There is also AccessibilityManager module that allows you to tune multipliers per each content size category.
Summary:
Dynamic Text Sizes for Text component.
Text gains new prop - allowFontScaling (true by default).
There is also AccessibilityManager module that allows you to tune multipliers per each content size category, but predefined multipliers are there.
This could potentially break some apps so please test carefully.
Summary:
@public
setFrame:forRootView: wasn't triggering a batch update, which is required to trigger text update. This meant text wasn't re-displayed after a rotate, only after a touch.
I also found a bug that meant we weren't caching textStorage as much as we could be. Fixed that too.
Test Plan:
* Test <Text> example in UIExplorer and ensure it lays out on rotate.
* Test <Timers> example and verify text is still updating
* Products shouldn't be affected as they have separate text implementation
Summary:
@public
This fixes an issue with the containerBackgroundColor property of `<Text>` nodes, where containerBackgroundColor was being overridden by the backgroundColor. I also fixed up the example so that it demonstrates the feature more clearly.
Test Plan:
* Check UIExplorer text example
* Run Catalyst snapshot tests and check MAdMan, Groups
Summary:
Also fix RCTShadowText export name.
Closes https://github.com/facebook/react-native/pull/857
Github Author: "Dr. Kibitz" <info@drkibitz.com>
Test Plan: Imported from GitHub, without a `Test Plan:` line.
Nick Lockwood
Kudo Chien
Martin Kralik
Patrick O'Meara
Josh Berdine
Quentin Adam
Vladislav Alexeev
Kevin Gozali
KJlmfe
Alex Akers
Vladimir Kurchatkin
Dr. Kibitz
Christopher Chedeau
James Ide
Spencer Ahrens
