Encapsulate a11y gesture detection in an external class. (c18f2fdf) · Commits · e / os / android_frameworks_base

services/accessibility/java/com/android/server/accessibility/AccessibilityGestureDetector.java

0 → 100644

+118 −0

Original line number	Diff line number	Diff line
		/*
		** Copyright 2015, The Android Open Source Project
		**
		** Licensed under the Apache License, Version 2.0 (the "License");
		** you may not use this file except in compliance with the License.
		** You may obtain a copy of the License at
		**
		** http://www.apache.org/licenses/LICENSE-2.0
		**
		** Unless required by applicable law or agreed to in writing, software
		** distributed under the License is distributed on an "AS IS" BASIS,
		** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		** See the License for the specific language governing permissions and
		** limitations under the License.
		*/

		package com.android.server.accessibility;

		import android.content.Context;
		import android.view.GestureDetector;
		import android.view.MotionEvent;

		/**
		* This class handles gesture detection for the Touch Explorer. It collects
		* touch events, and sends events to mListener as gestures are recognized.
		*/
		class AccessibilityGestureDetector extends GestureDetector.SimpleOnGestureListener {
		private final GestureDetector mGestureDetector;
		private final Listener mListener;
		private boolean mFirstTapDetected;
		private boolean mDoubleTapDetected;
		private int mPolicyFlags;

		AccessibilityGestureDetector(Context context, Listener listener) {
		mListener = listener;

		mGestureDetector = new GestureDetector(context, this);
		mGestureDetector.setOnDoubleTapListener(this);
		}

		public void onMotionEvent(MotionEvent event, int policyFlags) {
		mPolicyFlags = policyFlags;
		switch (event.getActionMasked()) {
		case MotionEvent.ACTION_DOWN:
		mDoubleTapDetected = false;
		break;

		case MotionEvent.ACTION_UP:
		maybeFinishDoubleTap(event, policyFlags);
		break;
		}
		mGestureDetector.onTouchEvent(event);
		}

		public void clear() {
		mFirstTapDetected = false;
		mDoubleTapDetected = false;
		}

		public boolean firstTapDetected() {
		return mFirstTapDetected;
		}

		@Override
		public boolean onDown(MotionEvent event) {
		return true;
		}

		@Override
		public void onLongPress(MotionEvent e) {
		maybeSendLongPress(e, mPolicyFlags);
		}

		@Override
		public boolean onSingleTapUp(MotionEvent event) {
		mFirstTapDetected = true;
		return false;
		}

		@Override
		public boolean onSingleTapConfirmed(MotionEvent event) {
		clear();
		return false;
		}

		@Override
		public boolean onDoubleTap(MotionEvent event) {
		// The processing of the double tap is deferred until the finger is
		// lifted, so that we can detect a long press on the second tap.
		mDoubleTapDetected = true;
		return true;
		}

		private void maybeSendLongPress(MotionEvent event, int policyFlags) {
		if (!mDoubleTapDetected) {
		return;
		}

		clear();

		mListener.onDoubleTapAndHold(event, policyFlags);
		}

		private void maybeFinishDoubleTap(MotionEvent event, int policyFlags) {
		if (!mDoubleTapDetected) {
		return;
		}

		clear();

		mListener.onDoubleTap(event, policyFlags);
		}

		public interface Listener {
		public void onDoubleTapAndHold(MotionEvent event, int policyFlags);
		public void onDoubleTap(MotionEvent event, int policyFlags);
		}
		}

services/accessibility/java/com/android/server/accessibility/TouchExplorer.java

+79 −158

Original line number	Diff line number	Diff line
		@@ -25,11 +25,8 @@ import android.gesture.GestureStore;
		import android.gesture.GestureStroke;
		import android.gesture.Prediction;
		import android.graphics.Point;
		import android.graphics.Rect;
		import android.os.Handler;
		import android.os.SystemClock;
		import android.util.Slog;
		import android.view.GestureDetector;
		import android.view.InputDevice;
		import android.view.KeyEvent;
		import android.view.MotionEvent;
		@@ -67,7 +64,7 @@ import java.util.List;
		*
		* @hide
		*/
		class TouchExplorer implements EventStreamTransformation {
		class TouchExplorer implements EventStreamTransformation, AccessibilityGestureDetector.Listener {

		private static final boolean DEBUG = false;

		@@ -139,8 +136,8 @@ class TouchExplorer implements EventStreamTransformation {
		// Command for exiting gesture detection mode after a timeout.
		private final ExitGestureDetectionModeDelayed mExitGestureDetectionModeDelayed;

		// Helper to detect and react to double tap in touch explore mode.
		private final DoubleTapDetector mDoubleTapDetector;
		// Helper to detect gestures.
		private final AccessibilityGestureDetector mGestureDetector;

		// The scaled minimal distance before we take the middle of the distance between
		// the two dragging pointers as opposed to use the location of the primary one.
		@@ -230,7 +227,7 @@ class TouchExplorer implements EventStreamTransformation {
		mSendTouchInteractionEndDelayed = new SendAccessibilityEventDelayed(
		AccessibilityEvent.TYPE_TOUCH_INTERACTION_END,
		mDetermineUserIntentTimeout);
		mDoubleTapDetector = new DoubleTapDetector(mContext);
		mGestureDetector = new AccessibilityGestureDetector(context, this);
		final float density = context.getResources().getDisplayMetrics().density;
		mScaledMinPointerDistanceToUseMiddleLocation =
		(int) (MIN_POINTER_DISTANCE_TO_USE_MIDDLE_LOCATION_DIP * density);
		@@ -290,8 +287,8 @@ class TouchExplorer implements EventStreamTransformation {
		// Reset the pointer trackers.
		mReceivedPointerTracker.clear();
		mInjectedPointerTracker.clear();
		// Clear the double tap detector
		mDoubleTapDetector.clear();
		// Clear the gesture detector
		mGestureDetector.clear();
		// Go to initial state.
		// Clear the long pressing pointer remap data.
		mLongPressingPointerId = -1;
		@@ -390,6 +387,77 @@ class TouchExplorer implements EventStreamTransformation {
		}
		}

		@Override
		public void onDoubleTapAndHold(MotionEvent event, int policyFlags) {
		// Pointers should not be zero when running this command.
		if (mReceivedPointerTracker.getLastReceivedEvent().getPointerCount() == 0) {
		return;
		}

		final int pointerIndex = event.getActionIndex();
		final int pointerId = event.getPointerId(pointerIndex);

		Point clickLocation = mTempPoint;
		final int result = computeClickLocation(clickLocation);

		if (result == CLICK_LOCATION_NONE) {
		return;
		}

		mLongPressingPointerId = pointerId;
		mLongPressingPointerDeltaX = (int) event.getX(pointerIndex) - clickLocation.x;
		mLongPressingPointerDeltaY = (int) event.getY(pointerIndex) - clickLocation.y;

		sendHoverExitAndTouchExplorationGestureEndIfNeeded(policyFlags);

		mCurrentState = STATE_DELEGATING;
		sendDownForAllNotInjectedPointers(event, policyFlags);
		}

		@Override
		public void onDoubleTap(MotionEvent event, int policyFlags) {
		// This should never be called when more than two pointers are down.
		if (event.getPointerCount() > 2) {
		return;
		}

		// Remove pending event deliveries.
		mSendHoverEnterAndMoveDelayed.cancel();
		mSendHoverExitDelayed.cancel();

		if (mSendTouchExplorationEndDelayed.isPending()) {
		mSendTouchExplorationEndDelayed.forceSendAndRemove();
		}
		if (mSendTouchInteractionEndDelayed.isPending()) {
		mSendTouchInteractionEndDelayed.forceSendAndRemove();
		}

		final int pointerIndex = event.getActionIndex();
		final int pointerId = event.getPointerId(pointerIndex);

		Point clickLocation = mTempPoint;
		final int result = computeClickLocation(clickLocation);
		if (result == CLICK_LOCATION_NONE) {
		return;
		}

		// Do the click.
		PointerProperties[] properties = new PointerProperties[1];
		properties[0] = new PointerProperties();
		event.getPointerProperties(pointerIndex, properties[0]);
		PointerCoords[] coords = new PointerCoords[1];
		coords[0] = new PointerCoords();
		coords[0].x = clickLocation.x;
		coords[0].y = clickLocation.y;
		MotionEvent click_event = MotionEvent.obtain(event.getDownTime(),
		event.getEventTime(), MotionEvent.ACTION_DOWN, 1, properties,
		coords, 0, 0, 1.0f, 1.0f, event.getDeviceId(), 0,
		event.getSource(), event.getFlags());
		final boolean targetAccessibilityFocus = (result == CLICK_LOCATION_ACCESSIBILITY_FOCUS);
		sendActionDownAndUp(click_event, policyFlags, targetAccessibilityFocus);
		click_event.recycle();
		}

		/**
		* Handles a motion event in touch exploring state.
		*
		@@ -403,7 +471,7 @@ class TouchExplorer implements EventStreamTransformation {

		mVelocityTracker.addMovement(rawEvent);

		mDoubleTapDetector.onMotionEvent(event, policyFlags);
		mGestureDetector.onMotionEvent(event, policyFlags);

		switch (event.getActionMasked()) {
		case MotionEvent.ACTION_DOWN: {
		@@ -430,7 +498,7 @@ class TouchExplorer implements EventStreamTransformation {
		mSendTouchInteractionEndDelayed.forceSendAndRemove();
		}

		if (!mDoubleTapDetector.firstTapDetected() && !mTouchExplorationInProgress) {
		if (!mGestureDetector.firstTapDetected() && !mTouchExplorationInProgress) {
		if (!mSendHoverEnterAndMoveDelayed.isPending()) {
		// Deliver hover enter with a delay to have a chance
		// to detect what the user is trying to do.
		@@ -1055,153 +1123,6 @@ class TouchExplorer implements EventStreamTransformation {
		}
		}

		private class DoubleTapDetector extends GestureDetector.SimpleOnGestureListener {
		private final GestureDetector mGestureDetector;
		private boolean mFirstTapDetected;
		private boolean mDoubleTapDetected;
		private int mPolicyFlags;

		DoubleTapDetector(Context context) {
		mGestureDetector = new GestureDetector(context, this);
		mGestureDetector.setOnDoubleTapListener(this);
		}

		public void onMotionEvent(MotionEvent event, int policyFlags) {
		mPolicyFlags = policyFlags;
		switch (event.getActionMasked()) {
		case MotionEvent.ACTION_DOWN:
		mDoubleTapDetected = false;
		break;

		case MotionEvent.ACTION_UP:
		maybeFinishDoubleTap(event, policyFlags);
		break;
		}
		mGestureDetector.onTouchEvent(event);
		}

		@Override
		public boolean onDown(MotionEvent event) {
		return true;
		}

		@Override
		public void onLongPress(MotionEvent e) {
		maybeSendLongPress(e, mPolicyFlags);
		}

		@Override
		public boolean onSingleTapUp(MotionEvent event) {
		mFirstTapDetected = true;
		return false;
		}

		@Override
		public boolean onSingleTapConfirmed(MotionEvent event) {
		clear();
		return false;
		}

		@Override
		public boolean onDoubleTap(MotionEvent event) {
		// The processing of the double tap is deferred until the finger is
		// lifted, so that we can detect a long press on the second tap.
		mDoubleTapDetected = true;
		return true;
		}

		private void maybeSendLongPress(MotionEvent event, int policyFlags) {
		if (!mDoubleTapDetected) {
		return;
		}

		clear();

		// Pointers should not be zero when running this command.
		if (mReceivedPointerTracker.getLastReceivedEvent().getPointerCount() == 0) {
		return;
		}

		final int pointerIndex = event.getActionIndex();
		final int pointerId = event.getPointerId(pointerIndex);

		Point clickLocation = mTempPoint;
		final int result = computeClickLocation(clickLocation);

		if (result == CLICK_LOCATION_NONE) {
		return;
		}

		mLongPressingPointerId = pointerId;
		mLongPressingPointerDeltaX = (int) event.getX(pointerIndex) - clickLocation.x;
		mLongPressingPointerDeltaY = (int) event.getY(pointerIndex) - clickLocation.y;

		sendHoverExitAndTouchExplorationGestureEndIfNeeded(policyFlags);

		mCurrentState = STATE_DELEGATING;
		sendDownForAllNotInjectedPointers(event, policyFlags);
		}

		private void maybeFinishDoubleTap(MotionEvent event, int policyFlags) {
		if (!mDoubleTapDetected) {
		return;
		}

		clear();

		// This should never be called when more than two pointers are down.
		if (event.getPointerCount() > 2) {
		return;
		}

		// Remove pending event deliveries.
		mSendHoverEnterAndMoveDelayed.cancel();
		mSendHoverExitDelayed.cancel();

		if (mSendTouchExplorationEndDelayed.isPending()) {
		mSendTouchExplorationEndDelayed.forceSendAndRemove();
		}
		if (mSendTouchInteractionEndDelayed.isPending()) {
		mSendTouchInteractionEndDelayed.forceSendAndRemove();
		}

		final int pointerIndex = event.getActionIndex();
		final int pointerId = event.getPointerId(pointerIndex);

		Point clickLocation = mTempPoint;
		final int result = computeClickLocation(clickLocation);
		if (result == CLICK_LOCATION_NONE) {
		return;
		}

		// Do the click.
		PointerProperties[] properties = new PointerProperties[1];
		properties[0] = new PointerProperties();
		event.getPointerProperties(pointerIndex, properties[0]);
		PointerCoords[] coords = new PointerCoords[1];
		coords[0] = new PointerCoords();
		coords[0].x = clickLocation.x;
		coords[0].y = clickLocation.y;
		MotionEvent click_event = MotionEvent.obtain(event.getDownTime(),
		event.getEventTime(), MotionEvent.ACTION_DOWN, 1, properties,
		coords, 0, 0, 1.0f, 1.0f, event.getDeviceId(), 0,
		event.getSource(), event.getFlags());
		final boolean targetAccessibilityFocus = (result == CLICK_LOCATION_ACCESSIBILITY_FOCUS);
		sendActionDownAndUp(click_event, policyFlags, targetAccessibilityFocus);
		click_event.recycle();
		return;
		}

		public void clear() {
		mFirstTapDetected = false;
		mDoubleTapDetected = false;
		}

		public boolean firstTapDetected() {
		return mFirstTapDetected;
		}
		}

		/**
		* Determines whether a two pointer gesture is a dragging one.
		*