1 /*
2  * Copyright (C) 2019 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.launcher3.uioverrides.touchcontrollers;
18 
19 import static com.android.launcher3.uioverrides.touchcontrollers.PortraitStatesTouchController.isTouchOverHotseat;
20 
21 import android.view.MotionEvent;
22 import android.view.animation.Interpolator;
23 
24 import com.android.launcher3.Launcher;
25 import com.android.launcher3.anim.PendingAnimation;
26 import com.android.quickstep.views.RecentsView;
27 import com.android.quickstep.views.TaskView;
28 
29 /**
30  * Helper class for {@link PortraitStatesTouchController} that determines swipeable regions and
31  * animations on the overview state that depend on the recents implementation.
32  */
33 public final class PortraitOverviewStateTouchHelper {
34 
35     RecentsView mRecentsView;
36     Launcher mLauncher;
37 
PortraitOverviewStateTouchHelper(Launcher launcher)38     public PortraitOverviewStateTouchHelper(Launcher launcher) {
39         mLauncher = launcher;
40         mRecentsView = launcher.getOverviewPanel();
41     }
42 
43     /**
44      * Whether or not {@link PortraitStatesTouchController} should intercept the touch when on the
45      * overview state.
46      *
47      * @param ev the motion event
48      * @return true if we should intercept the motion event
49      */
canInterceptTouch(MotionEvent ev)50     boolean canInterceptTouch(MotionEvent ev) {
51         if (mRecentsView.getTaskViewCount() > 0) {
52             // Allow swiping up in the gap between the hotseat and overview.
53             return ev.getY() >= mRecentsView.getTaskViewAt(0).getBottom();
54         } else {
55             // If there are no tasks, we only intercept if we're below the hotseat height.
56             return isTouchOverHotseat(mLauncher, ev);
57         }
58     }
59 
60     /**
61      * Whether or not swiping down to leave overview state should return to the currently running
62      * task app.
63      *
64      * @return true if going back should take the user to the currently running task
65      */
shouldSwipeDownReturnToApp()66     boolean shouldSwipeDownReturnToApp() {
67         TaskView taskView = mRecentsView.getNextPageTaskView();
68         return taskView != null && mRecentsView.shouldSwipeDownLaunchApp();
69     }
70 
71     /**
72      * Create the animation for going from overview to the task app via swiping. Should only be
73      * called when {@link #shouldSwipeDownReturnToApp()} returns true.
74      *
75      * @param duration how long the animation should be
76      * @return the animation
77      */
createSwipeDownToTaskAppAnimation(long duration, Interpolator interpolator)78     PendingAnimation createSwipeDownToTaskAppAnimation(long duration, Interpolator interpolator) {
79         mRecentsView.setCurrentPage(mRecentsView.getDestinationPage());
80         TaskView taskView = mRecentsView.getCurrentPageTaskView();
81         if (taskView == null) {
82             throw new IllegalStateException("There is no task view to animate to.");
83         }
84         return mRecentsView.createTaskLaunchAnimation(taskView, duration, interpolator);
85     }
86 }
87