[ASDisplayViewAccessibility] A few accessibility improvements #1812
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This diff includes a few improvements for accessibility in Texture. * When determining a node’s accessibility elements, ignore any elements that are hidden, transparent, or out of the window. This matches UIKit’s behavior. * When sorting the accessible elements and their origins are equal, give precedence to elements with shorter accessibility frames, followed by elements with narrower widths. * Allow the ability to customize the comparator block that sorts the accessibility elements * Create an experiment to stop caching accessibilityElements in `_ASDisplayView`. If we cache elements, we will require users to clear the cache (by calling `setAccessibilityElements` to get the side effect of clearing the cache) when nodes change their hidden state or opacity. This seems like a lot to request of the user. We will put this in an experiment so we can see the perf implication is both when using voice over and when not using voice over. A few other notes: * I got rid of the `ASAccessibilityElementPositioning` protocol in favor of passing `NSObjects` to the sort comparator. `NSObject` implements the informal `UIAccessibilityProtocol` and therefore has an `accessibilityFrame` property. * I removed `static` from the `SortAccessibilityElements()` method definition. This allows me to declare it as `extern` in test it via unit tests.
jparise
reviewed
May 5, 2020
rcancro
commented
May 5, 2020
jparise
approved these changes
May 5, 2020
Changed name of `defaultComparator` to `defaultAccessibilityComparator` For some reason a accessibility test keeps failing on github, but runs fine locally. Changed the tests to make sure the array contains the proper items but not enforce order.
This was the last error: `fatal: unable to access 'https://github.com/pinterest/PINCache.git/': Could not resolve host: github.com`
nguyenhuy
reviewed
May 6, 2020
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Please also update ASConfigurationTests.mm and configuration.json with your experiment
nguyenhuy
approved these changes
May 6, 2020
* early exit if our view has no window when creating accessibility elements (This change also requiring making sure nodes in accessibility tests were in a window) * fixed test around experiments.
piotrdebosz
pushed a commit
to getstoryteller/Texture
that referenced
this pull request
Mar 1, 2021
…eGroup#1812) * [ASDisplayViewAccessibility] A few accessibility improvements This diff includes a few improvements for accessibility in Texture. * When determining a node’s accessibility elements, ignore any elements that are hidden, transparent, or out of the window. This matches UIKit’s behavior. * When sorting the accessible elements and their origins are equal, give precedence to elements with shorter accessibility frames, followed by elements with narrower widths. * Allow the ability to customize the comparator block that sorts the accessibility elements * Create an experiment to stop caching accessibilityElements in `_ASDisplayView`. If we cache elements, we will require users to clear the cache (by calling `setAccessibilityElements` to get the side effect of clearing the cache) when nodes change their hidden state or opacity. This seems like a lot to request of the user. We will put this in an experiment so we can see the perf implication is both when using voice over and when not using voice over. A few other notes: * I got rid of the `ASAccessibilityElementPositioning` protocol in favor of passing `NSObjects` to the sort comparator. `NSObject` implements the informal `UIAccessibilityProtocol` and therefore has an `accessibilityFrame` property. * I removed `static` from the `SortAccessibilityElements()` method definition. This allows me to declare it as `extern` in test it via unit tests.
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This diff includes a few improvements for accessibility in Texture.
_ASDisplayView. If we cache elements, we will require users to clear the cache (by callingsetAccessibilityElementsto get the side effect of clearing the cache) when nodes change their hidden state or opacity. This seems like a lot to request of the user. We will put this in an experiment so we can see the perf implication is both when using voice over and when not using voice over.A few other notes:
ASAccessibilityElementPositioningprotocol in favor of passingNSObjectsto the sort comparator.NSObjectimplements the informalUIAccessibilityprotocol and therefore has anaccessibilityFrameproperty.staticfrom theSortAccessibilityElements()method definition. This allows me to declare it asexternin test it via unit tests.