1 /* 2 * Copyright 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 androidx.core.haptics.signal 18 19 import androidx.core.haptics.device.HapticDeviceProfile 20 21 /** 22 * A [FallbackChainSignal] is a resolvable haptic signal that returns the first supported 23 * [HapticSignal] from a selection list, or null if no effect is supported by the device. 24 * 25 * A haptic fallback chain is composed of an ordered list of [ResolvableSignal], which allows 26 * composing this with generic haptic signal extensions, including other fallback chains. 27 * 28 * @sample androidx.core.haptics.samples.HapticFallbackChainOfSignals 29 * @see HapticDeviceProfile 30 */ 31 public class FallbackChainSignal( 32 33 /** The ordered list of haptic signals that defines the fallback chain. */ 34 public val signals: List<ResolvableSignal>, 35 ) : ResolvableSignal { 36 37 public companion object { 38 39 /** 40 * Returns a [FallbackChainSignal] with given signals. 41 * 42 * @sample androidx.core.haptics.samples.HapticFallbackChainOfSignals 43 */ 44 @JvmStatic fallbackChainOfnull45 public fun fallbackChainOf(vararg signals: ResolvableSignal): FallbackChainSignal = 46 FallbackChainSignal(signals.toList()) 47 } 48 49 override fun resolve(deviceProfile: HapticDeviceProfile): HapticSignal? = 50 signals 51 .asSequence() 52 .mapNotNull { it.resolve(deviceProfile) } <lambda>null53 .firstOrNull { deviceProfile.supports(it) } 54 } 55