| /* |
| * Copyright (C) 2018 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.systemui.statusbar.phone; |
| |
| import android.annotation.NonNull; |
| import android.hardware.input.InputManager; |
| import android.os.Handler; |
| import android.os.SystemClock; |
| import android.view.InputDevice; |
| import android.view.KeyCharacterMap; |
| import android.view.KeyEvent; |
| import android.view.MotionEvent; |
| |
| import com.android.systemui.recents.OverviewProxyService; |
| |
| /** |
| * A back action when triggered will execute a back command |
| */ |
| public class NavigationBackAction extends NavigationGestureAction { |
| |
| private static final String BACK_AFTER_END_PROP = |
| "quickstepcontroller_homegoesbackwhenend"; |
| private static final long BACK_BUTTON_FADE_OUT_ALPHA = 60; |
| private static final long BACK_GESTURE_POLL_TIMEOUT = 1000; |
| |
| private final Handler mHandler = new Handler(); |
| |
| private final Runnable mExecuteBackRunnable = new Runnable() { |
| @Override |
| public void run() { |
| if (isEnabled() && canPerformAction()) { |
| performBack(); |
| mHandler.postDelayed(this, BACK_GESTURE_POLL_TIMEOUT); |
| } |
| } |
| }; |
| |
| public NavigationBackAction(@NonNull NavigationBarView navigationBarView, |
| @NonNull OverviewProxyService service) { |
| super(navigationBarView, service); |
| } |
| |
| @Override |
| public boolean allowHitTargetToMoveOverDrag() { |
| return true; |
| } |
| |
| @Override |
| public boolean canPerformAction() { |
| return mProxySender.getBackButtonAlpha() > 0; |
| } |
| |
| @Override |
| public boolean isEnabled() { |
| return true; |
| } |
| |
| @Override |
| protected void onGestureStart(MotionEvent event) { |
| if (!QuickStepController.shouldHideBackButton(getContext())) { |
| mNavigationBarView.getBackButton().setAlpha(0 /* alpha */, true /* animate */, |
| BACK_BUTTON_FADE_OUT_ALPHA); |
| } |
| mHandler.removeCallbacks(mExecuteBackRunnable); |
| if (!shouldExecuteBackOnUp()) { |
| performBack(); |
| mHandler.postDelayed(mExecuteBackRunnable, BACK_GESTURE_POLL_TIMEOUT); |
| } |
| } |
| |
| @Override |
| protected void onGestureEnd() { |
| mHandler.removeCallbacks(mExecuteBackRunnable); |
| if (!QuickStepController.shouldHideBackButton(getContext())) { |
| mNavigationBarView.getBackButton().setAlpha( |
| mProxySender.getBackButtonAlpha(), true /* animate */); |
| } |
| if (shouldExecuteBackOnUp()) { |
| performBack(); |
| } |
| } |
| |
| @Override |
| public boolean disableProxyEvents() { |
| return true; |
| } |
| |
| private void performBack() { |
| sendEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK); |
| sendEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_BACK); |
| } |
| |
| private boolean shouldExecuteBackOnUp() { |
| return getGlobalBoolean(BACK_AFTER_END_PROP); |
| } |
| |
| private void sendEvent(int action, int code) { |
| long when = SystemClock.uptimeMillis(); |
| final KeyEvent ev = new KeyEvent(when, when, action, code, 0 /* repeat */, |
| 0 /* metaState */, KeyCharacterMap.VIRTUAL_KEYBOARD, 0 /* scancode */, |
| KeyEvent.FLAG_FROM_SYSTEM | KeyEvent.FLAG_VIRTUAL_HARD_KEY, |
| InputDevice.SOURCE_KEYBOARD); |
| InputManager.getInstance().injectInputEvent(ev, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC); |
| } |
| } |