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feat: smooth scroll zoom based on MapLibre GL JS #2198

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feat: smooth scroll zoom based on MapLibre GL JS #2198

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26aba5c
test: add interactionOptions param to TestApp
vinlet Apr 13, 2026
2c9a434
feat!: smooth scroll zooming based on MapLibre
vinlet Apr 10, 2026
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1 change: 1 addition & 0 deletions lib/flutter_map.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -66,4 +66,5 @@ export 'package:flutter_map/src/map/options/cursor_keyboard_rotation.dart';
export 'package:flutter_map/src/map/options/interaction.dart';
export 'package:flutter_map/src/map/options/keyboard.dart';
export 'package:flutter_map/src/map/options/options.dart';
export 'package:flutter_map/src/map/options/scroll_zoom.dart';
export 'package:flutter_map/src/map/widget.dart';
31 changes: 11 additions & 20 deletions lib/src/gestures/map_interactive_viewer.dart
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Expand Up @@ -5,6 +5,7 @@ import 'package:flutter/gestures.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:flutter_map/src/gestures/scroll_zoom.dart';
import 'package:flutter_map/src/misc/deg_rad_conversions.dart';
import 'package:flutter_map/src/misc/extensions.dart';
import 'package:latlong2/latlong.dart';
Expand Down Expand Up @@ -94,6 +95,8 @@ class MapInteractiveViewerState extends State<MapInteractiveViewer>
late Animation<double> _doubleTapZoomAnimation;
late Animation<LatLng> _doubleTapCenterAnimation;

late final ScrollZoomHandler _scrollZoomHandler;

// 'ckr' = cursor/keyboard rotation
final _ckrTriggered = ValueNotifier(false);
double _ckrClickDegrees = 0;
Expand Down Expand Up @@ -140,6 +143,11 @@ class MapInteractiveViewerState extends State<MapInteractiveViewer>
..addListener(_handleDoubleTapZoomAnimation)
..addStatusListener(_doubleTapZoomStatusListener);

_scrollZoomHandler = ScrollZoomHandler(
controller: widget.controller,
vsync: this,
);

ServicesBinding.instance.keyboard
.addHandler(cursorKeyboardRotationTriggerHandler);

Expand All @@ -164,6 +172,7 @@ class MapInteractiveViewerState extends State<MapInteractiveViewer>
widget.controller.removeListener(onMapStateChange);
_flingController.dispose();
_doubleTapController.dispose();
_scrollZoomHandler.dispose();

_ckrTriggered.dispose();
ServicesBinding.instance.keyboard
Expand Down Expand Up @@ -455,28 +464,10 @@ class MapInteractiveViewerState extends State<MapInteractiveViewer>
GestureBinding.instance.pointerSignalResolver.register(
pointerSignal,
(pointerSignal) {
pointerSignal as PointerScrollEvent;
final minZoom = _options.minZoom ?? 0.0;
final maxZoom = _options.maxZoom ?? double.infinity;
final newZoom = (_camera.zoom -
pointerSignal.scrollDelta.dy *
_interactionOptions.scrollWheelVelocity)
.clamp(minZoom, maxZoom);
// Calculate offset of mouse cursor from viewport center
final newCenter = _camera.focusedZoomCenter(
pointerSignal.localPosition,
newZoom,
);

_closeFlingAnimationController(MapEventSource.scrollWheel);
_closeDoubleTapController(MapEventSource.scrollWheel);

widget.controller.moveRaw(
newCenter,
newZoom,
hasGesture: true,
source: MapEventSource.scrollWheel,
);
_scrollZoomHandler
.onPointerSignal(pointerSignal as PointerScrollEvent);
},
);
}
Expand Down
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