feat: report programmatic camera moves through events and promises - #194
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A programmatic camera move was invisible from JS. onRegionChange and onRegionChangeComplete were gated on a user gesture, so setCamera, animateCamera, fitToCoordinates and the region / camera props emitted nothing, and the promises those methods return resolved as soon as the animation was handed to the SDK: `await animateCamera(...)` came back with the camera still at its old position. Both callbacks now fire for every move of the camera and carry a second RegionChangeDetails argument whose isGesture says who started it. One move emits one pair and nothing in between, and an update that leaves the camera where it is emits nothing - the Google Maps SDK reports a start and an idle even then, which would loop a handler that re-renders a map with an inline region prop. A gesture that interrupts the app's animation ends the app's move and starts its own. RegionChangeTracker holds these rules, in Kotlin and in Swift, with the same unit tests on both sides. Android and Google Maps on iOS also skip a region prop that matches what the map shows, as Apple already did, so echoing onRegionChangeComplete back into it is a no-op. The camera promises now settle when the camera stops: through the UIView.animate completion or regionDidChange on Apple, idleAt on Google Maps for iOS, and a real CancelableCallback on Android. A move cut short by a gesture, a later command or the view going away resolves; a call that never reached the map still rejects, as it has since #161. On MapKit a move is tracked only after it is handed over, because MapKit reports the end of the move it interrupts from inside that call. Verified with a scripted harness on an iPhone 17 simulator (Apple MapKit) and an Android 15 emulator (Google Maps): animateCamera(..., 1) resolves after ~1040 ms with the camera at its target; an animation interrupted after 500 ms by a second one resolves at ~520 ms and the second at ~1550 ms; both platforms emit the same events in all 16 scenarios, including an inline region prop re-rendered from the handler; and on Android a gesture taking over an animation emits the app's pair and then the gesture's. Google Maps on iOS is compile-checked only. Closes #136 Closes #137
…kers CameraAnimations.callback and CameraMoveTracker.track guarded against a released tracker and an already-settled move, neither of which any caller can produce. Also drops comments that repeated the KDoc or the settleAll doc, and restates the applyRegion echo check without the claims that no longer held once RegionChangeTracker suppressed no-op moves.
…era-moves Brings in #189, #188 and #67. Conflicts resolved: - applyRegion in both Google adapters keeps #67's lastAppliedRegion cache and #189's zero insets, and adds this branch's echo check after them. - The Kotlin Region.approximatelyEquals this branch added is dropped: #67 adds the same function in Region+ApproximateEquality.kt, and both copies would not compile. iOS Google now uses #67's Swift Region.approximatelyEquals for the echo check. - docs/architecture.md takes #188's overlay press row and this branch's region event row. README notes switch to #188's "Behavior change after 1.2.1" wording.
…era-moves Brings in #190, #191 and #192. Beyond the conflicts, #191's animateToRegion now works like the other camera methods on this branch: its promise settles when the camera stops rather than when the animation is handed over, and its moves go through the same region-change tracking. - Apple: animateCamera and animateToRegion share trackAnimation; whenLaidOut runs the work and leaves the promise to it, rejecting only if the adapter goes before the first layout. - Google iOS: applyRegion reports whether it handed anything over, and an animated animateToRegion is tracked until idleAt like animateCamera. - Android: animateToRegion and fitToCoordinates go through promiseMoveWhenLaidOut, and fitCamera settles through a CancelableCallback; a duration under 1 ms jumps, as #191 made it. - Durations are milliseconds, as #191 made them; the README example passes 1000, and the animateToRegion docs state the settle point.
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WalkthroughRegion-change callbacks now include gesture context for programmatic and gesture-driven moves. Camera promises now settle on completion, interruption, release, or immediate no-op paths on Android and iOS. Documentation, examples, and tests describe the updated behavior. ChangesRegion Events and Camera Operations
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Client
participant MapView
participant ProviderAdapter
participant NativeMapSDK
participant RegionChangeTracker
Client->>MapView: Call animateCamera
MapView->>ProviderAdapter: Start camera operation
ProviderAdapter->>NativeMapSDK: Submit camera animation
NativeMapSDK-->>ProviderAdapter: Report movement and rest
ProviderAdapter->>RegionChangeTracker: Update move state
RegionChangeTracker-->>ProviderAdapter: Emit region callbacks with isGesture
ProviderAdapter-->>Client: Resolve promise after completion or interruption
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Review comments at @README.md:
- Line 261: Update the README example around animateCamera and getCamera to
place both awaited calls inside a try/catch, handling rejection if the map is
interrupted or unmounts.
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README.mddocs/architecture.mdexample/App.tsxpackage/android/src/main/java/com/margelo/nitro/nitromaps/CameraAnimations.ktpackage/android/src/main/java/com/margelo/nitro/nitromaps/GoogleMapProviderAdapter.ktpackage/android/src/main/java/com/margelo/nitro/nitromaps/HybridMapView.ktpackage/android/src/main/java/com/margelo/nitro/nitromaps/MapProviderAdapter.ktpackage/android/src/main/java/com/margelo/nitro/nitromaps/RegionChangeTracker.ktpackage/android/src/test/java/com/margelo/nitro/nitromaps/RegionApproximateEqualityTest.ktpackage/android/src/test/java/com/margelo/nitro/nitromaps/RegionChangeTrackerTest.ktpackage/ios/AppleMapProviderAdapter.swiftpackage/ios/Camera+GMSCameraPosition.swiftpackage/ios/Camera+MKMapCamera.swiftpackage/ios/Camera/CameraPlacement.swiftpackage/ios/Camera/RegionChangeTracker.swiftpackage/ios/CameraMoveTracker.swiftpackage/ios/GoogleMapProviderAdapter.swiftpackage/ios/HybridMapView.swiftpackage/ios/HybridMapViewDelegate.swiftpackage/ios/MapProviderAdapter.swiftpackage/ios/MapViewState.swiftpackage/ios/Package.swiftpackage/ios/Tests/Camera/RegionChangeTrackerTests.swiftpackage/src/index.tspackage/src/native/specs/MapView.nitro.tspackage/src/types/index.tspackage/src/types/map.tspackage/src/types/ref.tspackage/src/types/region.tspackage/type-tests/provider-props.ts
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getCamera rejects when the map view unmounted during the animation, and animateCamera does when it unmounted before the call ran, so the example catches both as the README asks.
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What does this change?
Closes #136. Closes #137.
A programmatic camera move was invisible from JS.
onRegionChange/onRegionChangeCompletefired only for gestures, andanimateCamera/fitToCoordinates(and, since #191,animateToRegion) resolved as soon as the animation was handed to the SDK, soawait animateCamera(...)came back with the camera still at its old position.Region events (#137)
setCamera,animateCamera,animateToRegion,fitToCoordinates, or aregion/cameraprop update - with a new second argument,details: RegionChangeDetails({ isGesture }), exported from the package root.regionre-sent with the same values), and neither does the map settling into its first position. A gesture that interrupts the app's animation ends the app's move (isGesture: false) and starts the user's (isGesture: true).RegionChangeTrackerholds these rules, in Kotlin and in Swift, with the same unit tests on both sides. It measures a move from where the camera last came to rest, because MapKit already reports the destination insideregionWillChangewhen the app sets the camera. It drops moves that never moved, because the Google Maps SDK on Android reports a start and an idle even then, which would loop a handler that re-renders a map with an inlineregion.regionthat matches what the map already shows, next to perf: update overlays in place, coalesce marker refreshes, fix quadratic clustering #67's same-region cache, so echoingonRegionChangeCompleteback intoregionmoves nothing.Camera promises (#136)
animateCamera,animateToRegionandfitToCoordinatesresolve when the camera stops: through theUIView.animatecompletion orregionDidChangeon Apple Maps,idleAton Google Maps for iOS, and a realCancelableCallbackon Android.setCamera, a0duration andfitToCoordinateswithanimated: falseresolve right away.CameraMoveTrackeronly after it is handed over. Registered earlier, the second of two back-to-back animations resolved at once, with the camera still halfway.Important
Behavior changes without a type change - the release notes need a Behavior changes entry for each:
onRegionChange/onRegionChangeCompleteused to fire only for user gestures. They now fire for programmatic moves too; code that treated every event as user input should checkdetails.isGesture.animateCamera/fitToCoordinatespromises used to resolve when the animation started. They now resolve when the camera has arrived, or when the animation is cut short.The README covers both ("Region change events", "When the camera promises settle"). It also corrects the react-native-maps migration table: their
onRegionChangefires on every frame, and ours corresponds to theironRegionChangeStart.How was it verified?
bun run lint,typecheck,typecheck:provider-types,build,bun test(412 pass) and the example'stsc.RegionChangeTrackerTest.kt(11, JVM),RegionChangeTrackerTests.swift(12,swift test) andRegionApproximateEqualityTest.kt.:react-native-better-maps:assembleDebug+testDebugUnitTest(154 tests), the iOS library scheme Apple-only and with Google Maps linked, and ktlint + swift-format on the touched files.animateToRegionadded:animateCamera(..., 1000)resolves after 1018-1064 ms with the camera at its target,animateToRegion(..., 1000)after 1036-1064 ms, and a0duration at once.animateCameraandanimateToRegionboth ways, fits,setCamera): the first resolves at about 520 ms, the second at 1536-1624 ms, with the camera at the second target.animateToRegionand a no-opanimateCameraresolve in about 1 ms and emit nothing. A re-sent identicalregion,onRegionChangeCompleteechoed intoregion, and an inlineregionre-rendered from the handler emit one pair and do not loop.isGesture: truepair; on Android a pan during an animation emits the app's pair and then the gesture's, and resolves the promise at the takeover.Scope
Known and left out
animateCameraoranimateToRegionanimation runs (UIView.animate), so a gesture cannot cut those short there. That predates this change and is documented in the README; a follow-up reworks it.fitToCoordinateswithoutanimatedanimates on iOS and jumps on Android. Pre-existing, documented.Checklist
bun run lint,bun run typecheckandbun run buildpassbun run nitrogenwas re-run (package/nitrogen/is generated and gitignored, never committed)Need help on this PR? Tag
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