1 /*
2  * Copyright (C) 2023 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;
18 
19 import static android.view.MotionEvent.CLASSIFICATION_TWO_FINGER_SWIPE;
20 
21 import static com.android.launcher3.config.FeatureFlags.ENABLE_TRACKPAD_GESTURE;
22 
23 import android.annotation.TargetApi;
24 import android.os.Build;
25 import android.view.MotionEvent;
26 
27 /** Handles motion events from trackpad. */
28 public class MotionEventsUtils {
29 
30     /** {@link MotionEvent#CLASSIFICATION_MULTI_FINGER_SWIPE} is hidden. */
31     public static final int CLASSIFICATION_MULTI_FINGER_SWIPE = 4;
32 
33     /** {@link MotionEvent#AXIS_GESTURE_SWIPE_FINGER_COUNT} is hidden. */
34     private static final int AXIS_GESTURE_SWIPE_FINGER_COUNT = 53;
35 
36     @TargetApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
isTrackpadScroll(MotionEvent event)37     public static boolean isTrackpadScroll(MotionEvent event) {
38         return ENABLE_TRACKPAD_GESTURE.get()
39                 && event.getClassification() == CLASSIFICATION_TWO_FINGER_SWIPE;
40     }
41 
42     @TargetApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
isTrackpadMultiFingerSwipe(MotionEvent event)43     public static boolean isTrackpadMultiFingerSwipe(MotionEvent event) {
44         return ENABLE_TRACKPAD_GESTURE.get()
45                 && event.getClassification() == CLASSIFICATION_MULTI_FINGER_SWIPE;
46     }
47 
isTrackpadThreeFingerSwipe(MotionEvent event)48     public static boolean isTrackpadThreeFingerSwipe(MotionEvent event) {
49         return isTrackpadMultiFingerSwipe(event) && event.getAxisValue(
50                 AXIS_GESTURE_SWIPE_FINGER_COUNT) == 3;
51     }
52 
isTrackpadFourFingerSwipe(MotionEvent event)53     public static boolean isTrackpadFourFingerSwipe(MotionEvent event) {
54         return isTrackpadMultiFingerSwipe(event) && event.getAxisValue(
55                 AXIS_GESTURE_SWIPE_FINGER_COUNT) == 4;
56     }
57 
isTrackpadMotionEvent(MotionEvent event)58     public static boolean isTrackpadMotionEvent(MotionEvent event) {
59         return isTrackpadScroll(event) || isTrackpadMultiFingerSwipe(event);
60     }
61 }
62