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[iOS] Inject DisplayLinkManager into FlutterViewController#189764

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cbracken:inject-displaylink-manager-3
Jul 21, 2026
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[iOS] Inject DisplayLinkManager into FlutterViewController#189764
cbracken merged 1 commit into
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cbracken:inject-displaylink-manager-3

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Follow-up to DisplayLinkManager singleton migration (#189492). createTouchRateCorrectionVSyncClientIfNeeded read
FlutterDisplayLinkManager.shared directly in three places when deciding whether to create the touch-rate-correction VSyncClient and seeding its isVariableRefreshRateEnabled/maxRefreshRate.

FlutterViewController has too many public initializers to add a constructor parameter without breaking API. However, we can wire this up similarly to how we declare keyboardInsetManager and accessibilityFeatures as internal strong properties in FlutterViewController_Internal.h and assign in
performCommonViewControllerInitialization. We now set FlutterDisplayLinkManager.shared at init, and migrate the existing uses of the static shared singleton to reads of this property.

No changes to tests because there are no semantic changes; this is covered by existing tests.

Issue: #175879
Issue: #181684

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Note: The Flutter team is currently trialing the use of Gemini Code Assist for GitHub. Comments from the gemini-code-assist bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.

Follow-up to DisplayLinkManager singleton migration (flutter#189492).
createTouchRateCorrectionVSyncClientIfNeeded read
FlutterDisplayLinkManager.shared directly in three places when deciding
whether to create the touch-rate-correction VSyncClient and seeding its
isVariableRefreshRateEnabled/maxRefreshRate.

FlutterViewController has too many public initializers to add a
constructor parameter without breaking API. However, we can wire this up
similarly to how we declare keyboardInsetManager and
accessibilityFeatures as internal strong properties in
FlutterViewController_Internal.h and assign in
performCommonViewControllerInitialization. We now set
FlutterDisplayLinkManager.shared at init, and migrate the existing uses
of the static shared singleton to reads of this property.

No changes to tests because there are no semantic changes; this is
covered by existing tests.

Issue: flutter#175879
Issue: flutter#181684
@cbracken
cbracken requested a review from a team as a code owner July 21, 2026 06:27
@flutter-dashboard flutter-dashboard Bot added the CICD Run CI/CD label Jul 21, 2026
@github-actions github-actions Bot added platform-ios iOS applications specifically engine flutter/engine related. See also e: labels. team-ios Owned by iOS platform team labels Jul 21, 2026
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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group.

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Code Review

This pull request refactors FlutterViewController to store and use a local displayLinkManager property instead of repeatedly accessing the shared singleton FlutterDisplayLinkManager.shared. Feedback was provided regarding a style guide violation in the property declaration where the pointer asterisk should be adjacent to the variable name.

@stuartmorgan-g

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test-exempt: code refactor with no semantic change

@cbracken
cbracken added this pull request to the merge queue Jul 21, 2026
Merged via the queue into flutter:master with commit 49234bc Jul 21, 2026
19 of 20 checks passed
@cbracken
cbracken deleted the inject-displaylink-manager-3 branch July 21, 2026 23:42
auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Jul 22, 2026
flutter/flutter@1ac2e82...2a2a79d

2026-07-22 [email protected] Clear cached directional focus history on a non-directional focus request  (flutter/flutter#187957)
2026-07-22 [email protected] ci: Include root pubspec.yaml in pub cache key (flutter/flutter#189826)
2026-07-22 [email protected] Remove codecov badge from README (flutter/flutter#189728)
2026-07-22 [email protected] Clean android engine/embedding tests (flutter/flutter#189276)
2026-07-22 [email protected] Add barrierBuilder support to showDialog and showGeneralDialog (flutter/flutter#187992)
2026-07-22 [email protected] Fix Mockito dynamic agent loading warnings in Robolectric tests (flutter/flutter#189804)
2026-07-22 [email protected] [iOS] Remove dead RasterThreadMerger plumbing from platform views (flutter/flutter#189753)
2026-07-22 [email protected] Add OverlayPortal.overlayChildLayoutBuilder sample (flutter/flutter#188930)
2026-07-22 [email protected] Automate recurring tasks via workflows - localizations (flutter/flutter#189750)
2026-07-21 [email protected] [iOS] Remove dead parameters and no-op overrides (flutter/flutter#189754)
2026-07-21 [email protected] [iOS] Inject DisplayLinkManager into FlutterViewController (flutter/flutter#189764)
2026-07-21 [email protected] Support custom BoxBorder animation in BoxDecoration (flutter/flutter#186348)
2026-07-21 [email protected] Rename CpuArch.x86_64 to CpuArch.x64 (flutter/flutter#189478)
2026-07-21 [email protected] Roll Skia from 569534e9fa59 to 5e183e5aeac5 (3 revisions) (flutter/flutter#189795)
2026-07-21 [email protected] Roll Dart SDK from 3b2f5ad7718d to 1e65011ee004 (4 revisions) (flutter/flutter#189791)
2026-07-21 [email protected] Run delete-bot-branches.yaml on `pull_request_target` instead of `pull_request` so that we can access secrets. (flutter/flutter#189793)
2026-07-21 [email protected] Batch release directory correction (flutter/flutter#189738)
2026-07-21 [email protected] [flutter_test][Test cross imports] Move TestWidgetsApp to flutter_test (flutter/flutter#189435)
2026-07-21 [email protected] Fix null-deref/double-dispose in StretchingOverscrollIndicator (#189589) (flutter/flutter#189667)
2026-07-21 [email protected] Roll Packages from 611899b to 8260a1e (10 revisions) (flutter/flutter#189782)
2026-07-21 [email protected] [iOS] Inject DisplayLinkManager into FlutterMetalLayer (flutter/flutter#189752)
2026-07-21 [email protected] Derive the SkImage size used by ImageEncodingImpeller::ConvertDlImageToSkImage from the size of the underlying texture, not the size of the DlImage (flutter/flutter#189739)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages
Please CC [email protected],[email protected] on the revert to ensure that a human
is aware of the problem.

To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
Zubii12 pushed a commit to Zubii12/packages that referenced this pull request Jul 23, 2026
…r#12272)

flutter/flutter@1ac2e82...2a2a79d

2026-07-22 [email protected] Clear cached directional focus history on a non-directional focus request  (flutter/flutter#187957)
2026-07-22 [email protected] ci: Include root pubspec.yaml in pub cache key (flutter/flutter#189826)
2026-07-22 [email protected] Remove codecov badge from README (flutter/flutter#189728)
2026-07-22 [email protected] Clean android engine/embedding tests (flutter/flutter#189276)
2026-07-22 [email protected] Add barrierBuilder support to showDialog and showGeneralDialog (flutter/flutter#187992)
2026-07-22 [email protected] Fix Mockito dynamic agent loading warnings in Robolectric tests (flutter/flutter#189804)
2026-07-22 [email protected] [iOS] Remove dead RasterThreadMerger plumbing from platform views (flutter/flutter#189753)
2026-07-22 [email protected] Add OverlayPortal.overlayChildLayoutBuilder sample (flutter/flutter#188930)
2026-07-22 [email protected] Automate recurring tasks via workflows - localizations (flutter/flutter#189750)
2026-07-21 [email protected] [iOS] Remove dead parameters and no-op overrides (flutter/flutter#189754)
2026-07-21 [email protected] [iOS] Inject DisplayLinkManager into FlutterViewController (flutter/flutter#189764)
2026-07-21 [email protected] Support custom BoxBorder animation in BoxDecoration (flutter/flutter#186348)
2026-07-21 [email protected] Rename CpuArch.x86_64 to CpuArch.x64 (flutter/flutter#189478)
2026-07-21 [email protected] Roll Skia from 569534e9fa59 to 5e183e5aeac5 (3 revisions) (flutter/flutter#189795)
2026-07-21 [email protected] Roll Dart SDK from 3b2f5ad7718d to 1e65011ee004 (4 revisions) (flutter/flutter#189791)
2026-07-21 [email protected] Run delete-bot-branches.yaml on `pull_request_target` instead of `pull_request` so that we can access secrets. (flutter/flutter#189793)
2026-07-21 [email protected] Batch release directory correction (flutter/flutter#189738)
2026-07-21 [email protected] [flutter_test][Test cross imports] Move TestWidgetsApp to flutter_test (flutter/flutter#189435)
2026-07-21 [email protected] Fix null-deref/double-dispose in StretchingOverscrollIndicator (#189589) (flutter/flutter#189667)
2026-07-21 [email protected] Roll Packages from 611899b to 8260a1e (10 revisions) (flutter/flutter#189782)
2026-07-21 [email protected] [iOS] Inject DisplayLinkManager into FlutterMetalLayer (flutter/flutter#189752)
2026-07-21 [email protected] Derive the SkImage size used by ImageEncodingImpeller::ConvertDlImageToSkImage from the size of the underlying texture, not the size of the DlImage (flutter/flutter#189739)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages
Please CC [email protected],[email protected] on the revert to ensure that a human
is aware of the problem.

To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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