| /* |
| * 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 android.view.MotionEvent.ACTION_DOWN; |
| |
| import android.content.Context; |
| import android.os.SystemClock; |
| import android.util.Log; |
| import android.view.MotionEvent; |
| import android.view.ViewConfiguration; |
| |
| import com.android.internal.R; |
| |
| import java.util.List; |
| |
| /** |
| * Responsible for dispatching delayed events. |
| */ |
| class MotionEventDispatcherDelegate { |
| |
| private static final String TAG = MotionEventDispatcherDelegate.class.getSimpleName(); |
| private static final boolean DBG = Log.isLoggable(TAG, Log.DEBUG); |
| |
| private final EventDispatcher mEventDispatcher; |
| private final int mMultiTapMaxDelay; |
| private long mLastDelegatedDownEventTime; |
| |
| interface EventDispatcher { |
| void dispatchMotionEvent(MotionEvent event, MotionEvent rawEvent, int policyFlags); |
| } |
| |
| MotionEventDispatcherDelegate(Context context, |
| EventDispatcher eventDispatcher) { |
| mEventDispatcher = eventDispatcher; |
| mMultiTapMaxDelay = ViewConfiguration.getDoubleTapTimeout() |
| + context.getResources().getInteger( |
| R.integer.config_screen_magnification_multi_tap_adjustment); |
| } |
| |
| void sendDelayedMotionEvents(List<MotionEventInfo> delayedEventQueue, |
| long lastDetectingDownEventTime) { |
| if (delayedEventQueue == null) { |
| return; |
| } |
| // Adjust down time to prevent subsequent modules being misleading, and also limit |
| // the maximum offset to mMultiTapMaxDelay to prevent the down time of 2nd tap is |
| // in the future when multi-tap happens. |
| final long offset = Math.min( |
| SystemClock.uptimeMillis() - lastDetectingDownEventTime, mMultiTapMaxDelay); |
| |
| for (MotionEventInfo info: delayedEventQueue) { |
| info.mEvent.setDownTime(info.mEvent.getDownTime() + offset); |
| dispatchMotionEvent(info.mEvent, info.mRawEvent, info.mPolicyFlags); |
| info.recycle(); |
| } |
| } |
| |
| void dispatchMotionEvent(MotionEvent event, MotionEvent rawEvent, int policyFlags) { |
| // Ensure that the state at the end of delegation is consistent with the last delegated |
| // UP/DOWN event in queue: still delegating if pointer is down, detecting otherwise |
| if (event.getActionMasked() == ACTION_DOWN) { |
| mLastDelegatedDownEventTime = event.getDownTime(); |
| if (DBG) { |
| Log.d(TAG, "dispatchMotionEvent mLastDelegatedDownEventTime time = " |
| + mLastDelegatedDownEventTime); |
| } |
| } |
| |
| // We cache some events to see if the user wants to trigger magnification. |
| // If no magnification is triggered we inject these events with adjusted |
| // time and down time to prevent subsequent transformations being confused |
| // by stale events. After the cached events, which always have a down, are |
| // injected we need to also update the down time of all subsequent non cached |
| // events. All delegated events cached and non-cached are delivered here. |
| if (DBG) { |
| Log.d(TAG, "dispatchMotionEvent original down time = " + event.getDownTime()); |
| } |
| event.setDownTime(mLastDelegatedDownEventTime); |
| mEventDispatcher.dispatchMotionEvent(event, rawEvent, policyFlags); |
| } |
| } |