Summary:
Fixes issue #11828 that causes layout animations for removed views to
remove some adjacent views as well. This happens because the animated
views are still present in the ViewGroup, which throws off subsequent
operations that rely on view indices having updated.
This issue was addressed in #11962, which was closed in favour of a more
reliable solution that addresses the issue globally since it’s difficult
to account for animated views everywhere. janicduplessis [recommended][0]
handling the issue through ViewManager.
Since API 11, Android provides `ViewGroup#startViewTransition(View)`
that can be used to keep child views visible even if they have been
removed from the group. ViewGroup keeps an array of these views, which
is only used for drawing. Methods such as `ViewGroup#getChildCount()`
and `ViewGroup#getChildAt(int)` will ignore them.
I believe relying on these framework methods within ViewManager is the
most reliable way to solve this issue because it also works if callers
ignore ViewManager and reach into the native view indices and counts
directly.
[0]: https://github.com/facebook/react-native/pull/11962#pullrequestreview-21862640
I wrote a minimal test app that you can find here:
<https://gist.github.com/lnikkila/87f3825442a5773f17ead433a810d53f>
The expected result is that the red and green squares disappear, a blue
one appears, and the black one stays in place. iOS has this behaviour,
but Android removes the black square as well.
We can see the bug with some breakpoint logging.
Without LayoutAnimation:
```
NativeViewHierarchyOptimizer: Removing node from parent with tag 2 at index 0
NativeViewHierarchyOptimizer: Removing node from parent with tag 4 at index 1
NativeViewHierarchyManager: Removing indices [0] with tags [2]
RootViewManager: Removing child view at index 0 with tag 2
NativeViewHierarchyManager: Removing indices [1] with tags [4]
RootViewManager: Removing child view at index 1 with tag 4
```
With LayoutAnimation tag 3 gets removed when it shouldn’t be:
```
NativeViewHierarchyOptimizer: Removing node from parent with tag 2 at index 0
NativeViewHierarchyOptimizer: Removing node from parent with tag 4 at index 1
NativeViewHierarchyManager: Removing indices [0] with tags [2]
NativeViewHierarchyManager: Removing indices [1] with tags [4]
-> RootViewManager: Removing child view at index 1 with tag 3
RootViewManager: Removing child view at index 2 with tag 4
(Animation listener kicks in here)
RootViewManager: Removing child view at index 1 with tag 2
```
Here are some GIFs to compare, click to expand:
<details>
<summary><b>Current master (iOS vs Android)</b></summary>
<p></p>
<img src="https://user-images.githubusercontent.com/1291143/38695083-fbc29cd4-3e93-11e8-9150-9b8ea75b87aa.gif" height="400" /><img src="https://user-images.githubusercontent.com/1291143/38695108-06eb73a6-3e94-11e8-867a-b95d7f926ccd.gif" height="400" />
</details><p></p>
<details>
<summary><b>With this patch (iOS vs Android, fixed)</b></summary>
<p></p>
<img src="https://user-images.githubusercontent.com/1291143/38695083-fbc29cd4-3e93-11e8-9150-9b8ea75b87aa.gif" height="400" /><img src="https://user-images.githubusercontent.com/1291143/38695137-1090f782-3e94-11e8-94c8-ce33a5d7ebdb.gif" height="400" />
</details><p></p>
Previously addressed in #11962, which wasn’t merged.
Tangentially related to my other LayoutAnimation PR #18651.
No documentation changes needed.
[ANDROID] [BUGFIX] [LayoutAnimation] - Removal LayoutAnimations no longer remove adjacent views as well in certain cases.
Closes https://github.com/facebook/react-native/pull/18830
Reviewed By: achen1
Differential Revision: D7612904
Pulled By: mdvacca
fbshipit-source-id: a04cf47ab80e0e813fa043125b1f907e212b1ad4
Summary:
Includes React Native and its dependencies Fresco, Metro, and Yoga. Excludes samples/examples/docs.
find: ^(?:( *)|( *(?:[\*~#]|::))( )? *)?Copyright (?:\(c\) )?(\d{4})\b.+Facebook[\s\S]+?BSD[\s\S]+?(?:this source tree|the same directory)\.$
replace: $1$2$3Copyright (c) $4-present, Facebook, Inc.\n$2\n$1$2$3This source code is licensed under the MIT license found in the\n$1$2$3LICENSE file in the root directory of this source tree.
Reviewed By: TheSavior, yungsters
Differential Revision: D7007050
fbshipit-source-id: 37dd6bf0ffec0923bfc99c260bb330683f35553e
Summary:
Use `getChildDrawingOrder` instead of reordering views. The old implementation didn't work properly when `removeClippedSubviews` was enabled and this one should have better performance since we don't play with the view hierarchy at all.
This fixes weird bugs with sticky headers in `SectionList` and allows removing the hack that disabled `removeClippedSubviews` when using sticky section headers.
**Test plan**
Tested using the SectionList and ListViewPaging examples that use sticky headers which uses z-index.
Closes https://github.com/facebook/react-native/pull/13105
Reviewed By: sahrens
Differential Revision: D4765869
Pulled By: achen1
fbshipit-source-id: be3c824658a3ce965b6e7324ad95c77cbd8a86ae
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.
Leo Nikkilä
Sophie Alpert
Janic Duplessis
Ahmed El-Helw
Tucker Connelly
Denis Koroskin
Krzysztof Magiera
Martin Konicek
