| /* |
| * Copyright (C) 2020 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.magnification; |
| |
| import static com.android.server.accessibility.gestures.GestureUtils.distance; |
| |
| import android.content.Context; |
| import android.os.Handler; |
| import android.view.MotionEvent; |
| import android.view.ViewConfiguration; |
| |
| import com.android.server.accessibility.gestures.GestureMatcher; |
| |
| /** |
| * This class is responsible for matching one-finger swipe gestures with any direction. |
| */ |
| class SimpleSwipe extends GestureMatcher { |
| |
| private final int mSwipeMinDistance; |
| private MotionEvent mLastDown; |
| private final int mDetectionDurationMillis; |
| |
| SimpleSwipe(Context context) { |
| super(MagnificationGestureMatcher.GESTURE_SWIPE, |
| new Handler(context.getMainLooper()), null); |
| mSwipeMinDistance = ViewConfiguration.get(context).getScaledTouchSlop(); |
| mDetectionDurationMillis = MagnificationGestureMatcher.getMagnificationMultiTapTimeout( |
| context); |
| } |
| |
| @Override |
| protected void onDown(MotionEvent event, MotionEvent rawEvent, int policyFlags) { |
| mLastDown = MotionEvent.obtain(event); |
| cancelAfter(mDetectionDurationMillis, event, rawEvent, policyFlags); |
| } |
| |
| @Override |
| protected void onPointerDown(MotionEvent event, MotionEvent rawEvent, int policyFlags) { |
| cancelGesture(event, rawEvent, policyFlags); |
| } |
| |
| @Override |
| protected void onMove(MotionEvent event, MotionEvent rawEvent, int policyFlags) { |
| if (gestureMatched(event, rawEvent, policyFlags)) { |
| completeGesture(event, rawEvent, policyFlags); |
| } |
| } |
| |
| @Override |
| protected void onUp(MotionEvent event, MotionEvent rawEvent, int policyFlags) { |
| if (gestureMatched(event, rawEvent, policyFlags)) { |
| completeGesture(event, rawEvent, policyFlags); |
| } else { |
| cancelGesture(event, rawEvent, policyFlags); |
| } |
| } |
| |
| private boolean gestureMatched(MotionEvent event, MotionEvent rawEvent, int policyFlags) { |
| return mLastDown != null && (distance(mLastDown, event) > mSwipeMinDistance); |
| } |
| |
| @Override |
| public void clear() { |
| if (mLastDown != null) { |
| mLastDown.recycle(); |
| } |
| mLastDown = null; |
| super.clear(); |
| } |
| |
| @Override |
| protected String getGestureName() { |
| return this.getClass().getSimpleName(); |
| } |
| } |