Summary:
On Android, LayoutAnimation directly updates the layout since a generic
scaling animation is more difficult to implement. This causes a problem
if the layout is updated during an animation, as the previous layout is
stored with the animation and is not updated. As a result the view gets
the old layout instead once the animation completes.
This commit fixes this issue by storing the layout handling animations
while those animations are active, and updating the animations on the
fly if one of the views receives a new layout. The resulting behaviour
mirrors what iOS currently does.
This bug has real world consequences, for example if a LayoutAnimation
happens right after a VirtualizedList has mounted, it’s possible that
some list rows are mounted while the animation is active, making the
list content view bigger. If the content view is being animated, the
new size will not take effect and it becomes impossible to scroll to
the end of the list.
I wrote a minimal test case to verify the bug, which I’ve also added to
RNTester. You can find the standalone app here:
<https://gist.github.com/lnikkila/18096c15b2fb99b232795ef59f8fb0cd>
The app creates a 100x300 view that gets animated to 200x300 using
LayoutAnimation. In the middle of that animation, the view’s dimensions
are updated to 300x300.
The expected result (which is currently exhibited by iOS) is that the
view’s dimensions after the animation would be 300x300. On Android the
view keeps the 200x300 dimensions since the animation overrides the
layout update.
The test app could probably be turned into an integration test by
measuring the view through UIManager after the animation, however I
don’t have time to do that right now...
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/1291143/38191325-f1aeb3d4-3670-11e8-8aca-14e7b24e2946.gif" height="400" /><img src="https://user-images.githubusercontent.com/1291143/38191337-f643fd8c-3670-11e8-9aac-531a32cc0a67.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/1291143/38191325-f1aeb3d4-3670-11e8-8aca-14e7b24e2946.gif" height="400" /><img src="https://user-images.githubusercontent.com/1291143/38191355-07f6e972-3671-11e8-8ad2-130d06d0d64d.gif" height="400" />
</details><p></p>
No documentation changes needed.
[ANDROID] [BUGFIX] [LayoutAnimation] - View layout is updated correctly during an ongoing LayoutAnimation, mirroring iOS behaviour.
Closes https://github.com/facebook/react-native/pull/18651
Differential Revision: D7604698
Pulled By: hramos
fbshipit-source-id: 4d114682fd540419b7447e999910e05726f42b39
Summary:
👋 Hello! Thanks for react-native, it’s a great project.
I was digging into the Android implementation in _ReactAndroid_ and noticed a couple typos in the documentation. I went through and tried to fix all the typos I could find using [aspell](http://aspell.net).
Not applicable: these changes are only to comments, and CI should be skipped.
[ANDROID][ENHANCEMENT][*] - Correct comment and docblock typos
Closes https://github.com/facebook/react-native/pull/17049
Differential Revision: D6472182
Pulled By: shergin
fbshipit-source-id: 7e62cab118609596b483d1cf16c3abf651d6753b
Summary:
Fixes LayoutAnimation when animating the position of a view that has a transform, the animation would start at the wrong position, offset by the transform translation value. I noticed this bug while working on sticky headers using animated in the UIExplorer <ListView> - Paging example.
**Test plan**
Made a simple repro for the bug https://gist.github.com/janicduplessis/eb985dc3accfd5982c77761be692e395 and tested that it fixed it. Also tested that the UIExplorer <ListView> - Paging example with sticky headers worked properly with this fix.
Closes https://github.com/facebook/react-native/pull/12140
Differential Revision: D4494389
Pulled By: mkonicek
fbshipit-source-id: dd49cb2db9dd4950e293596fbc773f7d79e8b10a
Summary:
The type key for a layout animation config must be supplied otherwise the app crashes (on Android). I added a isRequired check in JS as well as an explicit exception in java otherwise it crashed at a very hard to debug place. The crash happens when passing null to `Animation.setInterpolator` so this makes sure it never happens.
**Test plan (required)**
Tested that the error is caught properly in JS when passing an invalid animation config like
```
LayoutAnimation.configureNext({
duration: 250,
update: { type: undefined }, // or LayoutAnimation.Types.easeInEastOut in my case haha :)
});
```
Also tested the java exception.
Closes https://github.com/facebook/react-native/pull/7958
Differential Revision: D3401760
Pulled By: nicklockwood
fbshipit-source-id: 83c019d863c2b2294405b60e87297c562add0f49
Héctor Ramos
Leo Nikkilä
Liamandrew
Ram N
Cory Reed
Jonathan Keljo
Janic Duplessis
Vince Yuan
Olivier Notteghem
Der-Nien Lee
