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Emit non-hover pointer events on Android (#33526)
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/33526 Changelog: [Internal] Experimental pointer event dispatching on Android: touch pointer support only, hover events to come later. Reviewed By: vincentriemer Differential Revision: D34132667 fbshipit-source-id: 6506d43b4ad16e11b10c3cd23e0231428209411f
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Luna Wei
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Facebook GitHub Bot
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/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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package com.facebook.react.uimanager;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewGroup;
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import com.facebook.common.logging.FLog;
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import com.facebook.infer.annotation.Assertions;
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import com.facebook.react.common.ReactConstants;
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import com.facebook.react.uimanager.events.EventDispatcher;
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import com.facebook.react.uimanager.events.PointerEvent;
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import com.facebook.react.uimanager.events.PointerEventHelper;
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import com.facebook.react.uimanager.events.TouchEvent;
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import com.facebook.react.uimanager.events.TouchEventCoalescingKeyHelper;
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/**
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* JSPointerDispatcher handles dispatching pointer events to JS from RootViews. If you implement
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* RootView you need to call handleMotionEvent from onTouchEvent, onInterceptTouchEvent,
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* onHoverEvent, onInterceptHoverEvent. It will correctly find the right view to handle the touch
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* and also dispatch the appropriate event to JS
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*/
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public class JSPointerDispatcher {
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private final float[] mTargetCoordinates = new float[2];
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private int mChildHandlingNativeGesture = -1;
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private long mDownStartTime = TouchEvent.UNSET;
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private final ViewGroup mRootViewGroup;
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private final TouchEventCoalescingKeyHelper mTouchEventCoalescingKeyHelper =
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new TouchEventCoalescingKeyHelper();
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public JSPointerDispatcher(ViewGroup viewGroup) {
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mRootViewGroup = viewGroup;
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}
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public void onChildStartedNativeGesture(
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View childView, MotionEvent motionEvent, EventDispatcher eventDispatcher) {
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if (mChildHandlingNativeGesture != -1 || childView == null) {
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// This means we previously had another child start handling this native gesture and now a
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// different native parent of that child has decided to intercept the touch stream and handle
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// the gesture itself. Example where this can happen: HorizontalScrollView in a ScrollView.
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return;
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}
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int targetTag = findTargetTagAndSetCoordinates(motionEvent);
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dispatchCancelEvent(targetTag, motionEvent, eventDispatcher);
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mChildHandlingNativeGesture = childView.getId();
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}
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public void onChildEndedNativeGesture() {
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// There should be only one child gesture at any given time. We can safely turn off the flag.
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mChildHandlingNativeGesture = -1;
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}
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public void handleMotionEvent(MotionEvent motionEvent, EventDispatcher eventDispatcher) {
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// Ignore if child is handling native gesture
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if (mChildHandlingNativeGesture != -1) {
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return;
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}
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boolean supportsHover =
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PointerEventHelper.supportsHover(motionEvent.getToolType(motionEvent.getActionIndex()));
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int surfaceId = UIManagerHelper.getSurfaceId(mRootViewGroup);
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int action = motionEvent.getActionMasked();
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int targetTag = findTargetTagAndSetCoordinates(motionEvent);
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// First down pointer
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if (action == MotionEvent.ACTION_DOWN) {
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// Start a "down" coalescing key
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mDownStartTime = motionEvent.getEventTime();
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mTouchEventCoalescingKeyHelper.addCoalescingKey(mDownStartTime);
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if (!supportsHover) {
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eventDispatcher.dispatchEvent(
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PointerEvent.obtain(
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PointerEventHelper.POINTER_ENTER, surfaceId, targetTag, motionEvent));
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}
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eventDispatcher.dispatchEvent(
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PointerEvent.obtain(PointerEventHelper.POINTER_DOWN, surfaceId, targetTag, motionEvent));
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return;
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}
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// New pointer goes down, this can only happen after ACTION_DOWN is sent for the first pointer
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if (action == MotionEvent.ACTION_POINTER_DOWN) {
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mTouchEventCoalescingKeyHelper.incrementCoalescingKey(mDownStartTime);
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if (!supportsHover) {
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eventDispatcher.dispatchEvent(
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PointerEvent.obtain(
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PointerEventHelper.POINTER_ENTER, surfaceId, targetTag, motionEvent));
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}
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eventDispatcher.dispatchEvent(
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PointerEvent.obtain(PointerEventHelper.POINTER_DOWN, surfaceId, targetTag, motionEvent));
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return;
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}
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if (action == MotionEvent.ACTION_MOVE) {
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int coalescingKey = mTouchEventCoalescingKeyHelper.getCoalescingKey(mDownStartTime);
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eventDispatcher.dispatchEvent(
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PointerEvent.obtain(
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PointerEventHelper.POINTER_MOVE, surfaceId, targetTag, motionEvent, coalescingKey));
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return;
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}
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// Exactly one of the pointers goes up, not the last one
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if (action == MotionEvent.ACTION_POINTER_UP) {
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mTouchEventCoalescingKeyHelper.incrementCoalescingKey(mDownStartTime);
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eventDispatcher.dispatchEvent(
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PointerEvent.obtain(PointerEventHelper.POINTER_UP, surfaceId, targetTag, motionEvent));
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return;
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}
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// Last pointer comes up
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if (action == MotionEvent.ACTION_UP) {
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// End of a "down" coalescing key
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mTouchEventCoalescingKeyHelper.removeCoalescingKey(mDownStartTime);
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mDownStartTime = TouchEvent.UNSET;
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eventDispatcher.dispatchEvent(
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PointerEvent.obtain(PointerEventHelper.POINTER_UP, surfaceId, targetTag, motionEvent));
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if (!supportsHover) {
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eventDispatcher.dispatchEvent(
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PointerEvent.obtain(
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PointerEventHelper.POINTER_LEAVE, surfaceId, targetTag, motionEvent));
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}
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return;
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}
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if (action == MotionEvent.ACTION_CANCEL) {
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dispatchCancelEvent(targetTag, motionEvent, eventDispatcher);
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return;
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}
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FLog.w(
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ReactConstants.TAG,
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"Warning : Motion Event was ignored. Action="
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+ action
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+ " Target="
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+ targetTag
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+ " Supports Hover="
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+ supportsHover);
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}
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private int findTargetTagAndSetCoordinates(MotionEvent ev) {
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// This method updates `mTargetCoordinates` with coordinates for the motion event.
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return TouchTargetHelper.findTargetTagAndCoordinatesForTouch(
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ev.getX(), ev.getY(), mRootViewGroup, mTargetCoordinates, null);
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}
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private void dispatchCancelEvent(
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int targetTag, MotionEvent motionEvent, EventDispatcher eventDispatcher) {
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// This means the gesture has already ended, via some other CANCEL or UP event. This is not
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// expected to happen very often as it would mean some child View has decided to intercept the
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// touch stream and start a native gesture only upon receiving the UP/CANCEL event.
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Assertions.assertCondition(
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mChildHandlingNativeGesture == -1,
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"Expected to not have already sent a cancel for this gesture");
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int surfaceId = UIManagerHelper.getSurfaceId(mRootViewGroup);
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Assertions.assertNotNull(eventDispatcher)
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.dispatchEvent(
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PointerEvent.obtain(
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PointerEventHelper.POINTER_CANCEL, surfaceId, targetTag, motionEvent));
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eventDispatcher.dispatchEvent(
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PointerEvent.obtain(PointerEventHelper.POINTER_LEAVE, surfaceId, targetTag, motionEvent));
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mTouchEventCoalescingKeyHelper.removeCoalescingKey(mDownStartTime);
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mDownStartTime = TouchEvent.UNSET;
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}
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}
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