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feat: add onDisplayChanged event (listenForDisplayChanges) - #120
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 1 remain after this review. 📝 WalkthroughWalkthroughThe change adds native display-change detection on Android and iOS and exposes display dimensions through a JavaScript listener and ChangesDisplay change notifications
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant DisplayChangesListener
participant OrientationDirectorModuleImpl
participant EventManager
participant OrientationDirectorModule
DisplayChangesListener->>OrientationDirectorModuleImpl: changed display dimensions
OrientationDirectorModuleImpl->>EventManager: sendDisplayDidChange
EventManager->>OrientationDirectorModule: sendOnDisplayChanged
sequenceDiagram
participant OrientationDirectorImpl
participant EventManager
participant OrientationDirector
OrientationDirectorImpl->>EventManager: changed screen bounds
EventManager->>OrientationDirector: display-change parameters
Merge Risk: 🔵 Low · up to Apps with restricted window areas may receive incorrect display dimensions or an unexpected change event. This is a bounded risk to account for before merging. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new flow reports display dimensions within the host app rather than granting additional authority. No introduced security issue was established in the examined paths. Remaining uncertainty concerns platform-specific detection, lifecycle edge cases, and compatibility between native and JavaScript versions. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
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✅ Passed checks (4 passed)
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Review comments at
@android/src/main/java/com/orientationdirector/implementation/DisplayChangesListener.kt:
- Line 38: Expose a display-resynchronization method in DisplayChangesListener
and call it from the existing configuration-change receiver so moves between
existing displays are detected even when the activity remains resumed. Keep the
normalized-size comparison in the resynchronization path to suppress rotations
and window resizes.
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README.mdandroid/src/main/java/com/orientationdirector/OrientationDirectorModule.ktandroid/src/main/java/com/orientationdirector/implementation/DisplayChangesListener.ktandroid/src/main/java/com/orientationdirector/implementation/EventManager.ktandroid/src/main/java/com/orientationdirector/implementation/EventManagerDelegate.ktandroid/src/main/java/com/orientationdirector/implementation/OrientationDirectorModuleImpl.ktexample/src/screens/Explore.tsxios/OrientationDirector.mmios/implementation/EventManager.swiftios/implementation/OrientationDirectorImpl.swiftios/implementation/SceneGeometryListener.swiftios/implementation/Utils.swiftsrc/EventEmitter.tssrc/NativeOrientationDirector.tssrc/RNOrientationDirector.tssrc/types/DisplayChangedEvent.interface.ts
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Review comments at @ios/implementation/SceneGeometryListener.swift:
- Line 53: Update the activation-notification handler in SceneGeometryListener
so it retains the scene associated with the React Native window and ignores
activations from unrelated scenes before calling attach. Handle replacement of
the associated scene explicitly, updating the observation only when that scene
changes.
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ios/OrientationDirector.mmios/implementation/OrientationDirectorImpl.swiftios/implementation/SceneGeometryListener.swiftios/implementation/Utils.swift
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Notify when the app moves to a different physical display, e.g. when a foldable device is folded or unfolded, with the new display size in points (iOS) / dp (Android). Rotations and window resizes don't trigger it. - iOS: emitted when the window scene moves to another screen (iOS 16+) - Android: emitted when the physical size of the display changes, through DisplayManager.DisplayListener - Example: show the last display change in the Explore screen Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
- android: resync the display on configuration changes to detect moves between existing displays - ios: keep observing the first window scene and ignore activations of unrelated scenes Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@android/src/main/java/com/orientationdirector/implementation/DisplayChangesListener.kt:
- Line 69: Update the change comparison in sync() so equal physicalSize values
still trigger an event when the resulting display dimensions in dp differ;
compare dp dimensions or include display density alongside physicalSize in the
tracked state.
- Around line 91-92: Update the display-size calculation in
DisplayChangesListener to use WindowManager.defaultDisplay.getRealSize for all
supported Android versions. Remove the maximumWindowMetrics branch so sync()
compares and reports physical display dimensions rather than the activity’s
maximum window area.
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README.mdandroid/src/main/java/com/orientationdirector/implementation/DisplayChangesListener.ktandroid/src/main/java/com/orientationdirector/implementation/OrientationDirectorModuleImpl.ktexample/src/screens/Explore.tsxios/implementation/OrientationDirectorImpl.swiftios/implementation/SceneGeometryListener.swiftsrc/hooks/useDisplay.hook.tssrc/index.tsx
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Builds on #116: until it is merged, this PR's diff also shows its commits. Only the last two commits (
feat: add onDisplayChanged eventanddocs: document listenForDisplayChanges) belong to this PR.What
New
RNOrientationDirector.listenForDisplayChanges(({ width, height }) => …)(onDisplayChangedevent, iOS + Android): notifies when the app moves to a different physical display (e.g. fold / unfold), with the new display size in points (iOS) / dp (Android), in the orientation it is displayed. Rotations and window resizes (split view / multi-window) don't trigger it.It covers cases where no orientation changes at all: e.g. a portrait-only app, device held sideways while folded, then unfolded → interface and device orientation are the same before and after, only the display changes.
effectiveGeometrylistener introduced in fix(ios): update orientations on fold / unfold (iPhone Duo) #116).DisplayChangesListener(DisplayManager.DisplayListener), emitted when the physical size of the display changes (compared regardless of orientation); registered on host resume / unregistered on pause, so a change that happened in background is emitted on resume.listenForDisplayChangesdocumented.Testing
onDisplayChangedon unfold (669x951) and fold (466x678)onDisplayChangedon fold (443x994dp) and unfold (852x883dp), not on rotationsNotes
🤖 Generated with Claude Code
Summary by CodeRabbit
useDisplayhook to read display dimensions and update them when the app moves to another display.