Avoid including a potentially animated invisible image #50842
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fluttergithubbot
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This was referenced Feb 15, 2020
tvolkert
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Feb 18, 2020
| ), | ||
| ])); | ||
| ]))..addStatusListener((AnimationStatus status) { | ||
| if (_placeholderOpacityAnimation.isCompleted) { |
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Is this always going to be the same as status == AnimationStatus.completed?
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Yes - the implementation of isCompleted is status == AnimationStatus.completed
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Oh - sorry.
This might not be the same if we've changed the _placeholderOpacityAnimation, but the previous one we were listening to is still finishing.
This is meant to guard against that case, so we don't end up rebuilding unless the current animation is completed.
dnfield
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Description
Currently, FadeInImage continues to build the placeholder even if it's invisible. This is really sad if the placeholder is a multi frame looping animation, or just a large chunk of memory that no one else needs.
Just listening to the animation for the placeholder, when the status is completed for the current animation, setState to trigger a rebuild.
Related Issues
#35592
Tests
I added the following tests:
Test that when the animation completes on the placeholder, it's no longer in the tree.
Checklist
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[x]). This will ensure a smooth and quick review process.///).flutter analyze --flutter-repo) does not report any problems on my PR.Breaking Change
Did any tests fail when you ran them? Please read Handling breaking changes.