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Hide a11y elements when resigning active #29566

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dnfield merged 4 commits into from
Nov 6, 2021
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Hide a11y elements when resigning active #29566

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924bb90
Hide a11y elements when resigning active
dnfield Nov 5, 2021
3369661
Update shell/platform/darwin/ios/framework/Source/FlutterViewControll…
dnfield Nov 5, 2021
ff8f210
use post notification
dnfield Nov 6, 2021
e94459a
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dnfield Nov 6, 2021
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2 changes: 2 additions & 0 deletions shell/platform/darwin/ios/framework/Source/FlutterViewController.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -780,13 +780,15 @@ - (void)dealloc {

- (void)applicationBecameActive:(NSNotification*)notification {
TRACE_EVENT0("flutter", "applicationBecameActive");
self.view.accessibilityElementsHidden = NO;
if (_viewportMetrics.physical_width)
[self surfaceUpdated:YES];
[self goToApplicationLifecycle:@"AppLifecycleState.resumed"];
}

- (void)applicationWillResignActive:(NSNotification*)notification {
TRACE_EVENT0("flutter", "applicationWillResignActive");
self.view.accessibilityElementsHidden = YES;
[self goToApplicationLifecycle:@"AppLifecycleState.inactive"];
}

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17 changes: 17 additions & 0 deletions shell/platform/darwin/ios/framework/Source/FlutterViewControllerTest.mm
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Expand Up @@ -124,6 +124,8 @@ - (void)handlePressEvent:(FlutterUIPressProxy*)press
- (void)scrollEvent:(UIPanGestureRecognizer*)recognizer;
- (void)updateViewportMetrics;
- (void)onUserSettingsChanged:(NSNotification*)notification;
- (void)applicationWillResignActive:(NSNotification*)notification;
- (void)applicationBecameActive:(NSNotification*)notification;
@end

@interface FlutterViewControllerTest : XCTestCase
Expand Down Expand Up @@ -746,6 +748,21 @@ - (void)testHideOverlay {
engine.viewController = nil;
}

- (void)testHideA11yElements {
FlutterDartProject* project = [[FlutterDartProject alloc] init];
FlutterEngine* engine = [[FlutterEngine alloc] initWithName:@"foobar" project:project];
[engine createShell:@"" libraryURI:@"" initialRoute:nil];
FlutterViewController* realVC = [[FlutterViewController alloc] initWithEngine:engine
nibName:nil
bundle:nil];
XCTAssertFalse(realVC.view.accessibilityElementsHidden, @"");
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@jmagman jmagman Nov 5, 2021

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Posting the notifications directly instead of exposing the applicationWillResignActive: applicationBecameActive: API in the test worked for me:

  XCTAssertFalse(realVC.view.accessibilityElementsHidden);
  [[NSNotificationCenter defaultCenter] postNotificationName:UIApplicationWillResignActiveNotification object:nil];
  XCTAssertTrue(realVC.view.accessibilityElementsHidden);
  [[NSNotificationCenter defaultCenter] postNotificationName:UIApplicationDidBecomeActiveNotification object:nil];
  XCTAssertFalse(realVC.view.accessibilityElementsHidden);

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@dnfield dnfield Nov 6, 2021

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I went with this. I think I was somehow not rebuilding the target correctly when I got failures on this locally. It's not failing now.

[realVC applicationWillResignActive:nil];
XCTAssertTrue(realVC.view.accessibilityElementsHidden, @"");
[realVC applicationBecameActive:nil];
XCTAssertFalse(realVC.view.accessibilityElementsHidden, @"");
engine.viewController = nil;
}

- (void)testNotifyLowMemory {
FlutterEnginePartialMock* mockEngine = [[FlutterEnginePartialMock alloc] init];
FlutterViewController* viewController = [[FlutterViewController alloc] initWithEngine:mockEngine
Expand Down