1 /* 2 * Copyright (C) 2024 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.systemui.touchpad.tutorial.ui.gesture 18 19 import android.view.MotionEvent 20 import java.util.function.Consumer 21 22 /** Based on passed [MotionEvent]s recognizes different states of gesture and notifies callback. */ 23 interface GestureRecognizer : Consumer<MotionEvent> { addGestureStateCallbacknull24 fun addGestureStateCallback(callback: (GestureState) -> Unit) 25 26 fun clearGestureStateCallback() 27 } 28 29 fun isThreeFingerTouchpadSwipe(event: MotionEvent) = isNFingerTouchpadSwipe(event, fingerCount = 3) 30 31 fun isFourFingerTouchpadSwipe(event: MotionEvent) = isNFingerTouchpadSwipe(event, fingerCount = 4) 32 33 private fun isNFingerTouchpadSwipe(event: MotionEvent, fingerCount: Int): Boolean { 34 return event.classification == MotionEvent.CLASSIFICATION_MULTI_FINGER_SWIPE && 35 event.getAxisValue(MotionEvent.AXIS_GESTURE_SWIPE_FINGER_COUNT) == fingerCount.toFloat() 36 } 37 isMultifingerTouchpadSwipenull38fun isMultifingerTouchpadSwipe(event: MotionEvent): Boolean { 39 return event.classification == MotionEvent.CLASSIFICATION_MULTI_FINGER_SWIPE || 40 event.classification == MotionEvent.CLASSIFICATION_TWO_FINGER_SWIPE 41 } 42 isTwoFingerSwipenull43fun isTwoFingerSwipe(event: MotionEvent): Boolean { 44 return event.classification == MotionEvent.CLASSIFICATION_TWO_FINGER_SWIPE 45 } 46