[m-bert]

Description

On Android, while one finger rests on an empty part of the screen, a tap with a second finger on a RectButton, Touchable or Pressable does nothing: no onBegin, onPressIn or onPress. The same tap with no other finger down presses the button. The press right after the swallowed one is lost as well.

Since #4127 the orchestrator asks a button, when it is recorded, whether it may begin given the handlers already recorded, and the button refuses any handler that is not simultaneous with it, not on its own view and not a hover. The list passed is the orchestrator's whole gestureHandlers, which also holds the handlers recorded by other pointers. A resting finger keeps the root view's own handler recorded, so the second finger's button is cancelled before it begins. With one finger the root handler is recorded after the button, which is why the check only broke with two.

recordHandlerIfNotPresent now takes the pointer being extracted and passes only the handlers that already track it. Extraction is bottom-up and every handler starts tracking the pointer right after it is recorded, so those are exactly the handlers under the button on this touch, which is what #4127 meant by "already extracted". Handlers from other pointers no longer take part and keep being arbitrated at activation time. Call sites without a pointer (the TalkBack and keyboard synthetic click, manual state set from JS) pass an empty list, since nothing is under a touch that does not exist.

Fixes #4627.

Test plan

• Repro from the issue in the empty example: with a finger resting on a plain view, a second finger presses RectButton, Touchable and Pressable; single-finger presses afterwards still work. Verified on a Pixel 9 Pro emulator (API 36) and a Galaxy S24.
• argent flow run nested-touchables-test (the [Android] Cancel button gesture when other handlers are extracted before it #4127 behaviour) passes.

Test code:

// Repro for #4627: on Android, a second finger's tap on a button does nothing
// while another finger rests on the screen. The resting finger records the
// root view's handler; the button's `shouldBeginWithRecordedHandlers` (#4127)
// then refuses it and the button is cancelled before it begins.
import React, { useState } from 'react';
import { StyleSheet, Text, View } from 'react-native';
import {
  GestureDetector,
  GestureHandlerRootView,
  Pressable,
  RectButton,
  Touchable,
  useManualGesture,
} from 'react-native-gesture-handler';

// 1. Rest one finger on the grey area.
// 2. Tap each row with a second finger: expected a log + counter bump, got nothing.
// 3. Lift both, tap each row with one finger: it works.
export default function SecondFingerBesideRestingFinger() {
  const [counts, setCounts] = useState({
    rect: 0,
    touchable: 0,
    pressable: 0,
    tap: 0,
  });
  const bump = (key: keyof typeof counts) => {
    console.log(`[${key}] press`);
    setCounts((c) => ({ ...c, [key]: c[key] + 1 }));
  };

  // Control: a manual gesture is not a button, so #4127's check does not apply
  // to it. It counts touch-downs, so it ignores how many pointers are on screen.
  const tap = useManualGesture({
    runOnJS: true,
    onTouchesDown: (e) => {
      console.log('[control] touchesDown', e.numberOfTouches);
      bump('tap');
    },
    onTouchesUp: (e) => console.log('[control] touchesUp', e.numberOfTouches),
  });

  return (
    <GestureHandlerRootView style={styles.container}>
      <View testID="resting-area" style={styles.restingArea}>
        <Text>rest a finger here</Text>
      </View>
      <RectButton
        testID="rect-button"
        style={styles.button}
        onBegin={() => console.log('[rect] onBegin')}
        onFinalize={() => console.log('[rect] onFinalize')}
        onTouchesDown={(e) =>
          console.log('[rect] touchesDown', e.numberOfTouches)
        }
        onTouchesUp={(e) => console.log('[rect] touchesUp', e.numberOfTouches)}
        onTouchesCancel={() => console.log('[rect] touchesCancel')}
        onPress={() => bump('rect')}>
        <Text>RectButton: {counts.rect}</Text>
      </RectButton>
      <Touchable
        testID="touchable"
        style={styles.button}
        onPressIn={() => console.log('[touchable] onPressIn')}
        onPress={() => bump('touchable')}>
        <Text>Touchable: {counts.touchable}</Text>
      </Touchable>
      <Pressable
        testID="pressable"
        style={styles.button}
        onPressIn={() => console.log('[pressable] onPressIn')}
        onPress={() => bump('pressable')}>
        <Text>Pressable: {counts.pressable}</Text>
      </Pressable>
      <GestureDetector gesture={tap}>
        <View testID="tap-detector" style={[styles.button, styles.control]}>
          <Text>Manual gesture (control): {counts.tap}</Text>
        </View>
      </GestureDetector>
    </GestureHandlerRootView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    gap: 24,
    padding: 16,
  },
  restingArea: {
    width: 240,
    height: 80,
    backgroundColor: '#e0e0e0',
    alignItems: 'center',
    justifyContent: 'center',
  },
  button: {
    width: 240,
    height: 48,
    backgroundColor: '#b58df1',
    alignItems: 'center',
    justifyContent: 'center',
  },
  control: {
    backgroundColor: '#8fd3b5',
  },
});

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📝 Summary

Summary by CodeRabbit

• Bug Fixes
  • Improved handling of simultaneous and multi-touch gestures by associating tracked pointers with the relevant gesture handlers.

The Android gesture orchestrator now evaluates recorded handlers against the pointer being extracted. GestureHandler.isTrackingPointer is public so the orchestrator can apply that filter.

Changes: Android pointer-aware handler recording

Layer / File(s)	Summary
Expose pointer tracking and filter recorded handlers packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/core/GestureHandler.kt, packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/core/GestureHandlerOrchestrator.kt	GestureHandler.isTrackingPointer is now public. recordHandlerIfNotPresent accepts an optional pointer ID. When the ID is nonnegative, the pre-begin check uses only recorded handlers tracking that pointer; otherwise, it uses an empty list. Ancestor, view, and compound-view extraction pass the current pointer ID.

Suggested reviewers: j-piasecki

Priority: Normal

Severity of issue fixed: Medium

Merge Risk: Low · up to a2ace

Native button activation can ignore an incompatible active handler; restore pointerless arbitration before merging.

Pre-merge checks: 3

Check name	Status	Explanation
Title check		The title clearly describes the main Android change: limiting handler checks to handlers extracted for the same pointer.
Linked Issues check		The whole-PR diff addresses [#4627]. recordHandlerIfNotPresent now filters recorded handlers by the extracted pointer ID before calling shouldBeginWithRecordedHandlers. The ancestor, view, and com…
Out of Scope Changes check		The PR changes only Android gesture-handler code in GestureHandler.kt and GestureHandlerOrchestrator.kt. The visibility change for isTrackingPointer supports the pointer-specific filter. The orc…

Full details: Linked Issues check

Explanation

The whole-PR diff addresses [#4627]. recordHandlerIfNotPresent now filters recorded handlers by the extracted pointer ID before calling shouldBeginWithRecordedHandlers. The ancestor, view, and compound-view extraction paths pass that pointer ID. Calls without a pointer use an empty list. This prevents handlers from another pointer from cancelling the second-finger button before it begins. The change remains Android-specific and matches the issue scope.

Full details: Out of Scope Changes check

Explanation

The PR changes only Android gesture-handler code in GestureHandler.kt and GestureHandlerOrchestrator.kt. The visibility change for isTrackingPointer supports the pointer-specific filter. The orchestrator changes implement the [#4627] behavior and preserve no-pointer call behavior through the default value. No unrelated change is shown in the whole-PR diff.

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Actionable comments posted: 1

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Inline comments:
Review comments at
@packages/react-native-gesture-handler/android/src/main/java/com/swmansion/gesturehandler/core/GestureHandlerOrchestrator.kt:
- Around line 546-550: Update the recorded-handler selection in
recordHandlerIfNotPresent to keep filtering gestureHandlers by pointerId when it
is nonnegative, but use the full gestureHandlers list when pointerId is
negative. Preserve the existing shouldBeginWithRecordedHandlers arbitration so
pointerless native activation still respects incompatible recorded handlers.

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[j-piasecki]

It may make sense to move this check into shouldBeginWithRecordedHandlers so each handler can decide on its own whether to filter or not - buttons may want to do it differently depending on exclusive, but I didn't think that much about it, so it may be a bad idea. WDYT?

[m-bert]

To be honest I don't have a strong opinion.

I have a feeling that orchestrator is a better place for deciding which handlers should be checked by given handler, also recorded was documented as "handlers already recorded for the current touch". Moving it to shouldBeginWithRecordedHandlers might give more flexibility, but I'm not sure we need that.