| /* |
| * Copyright 2019 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 androidx.animation |
| |
| internal open class StateImpl<T>(val name: T) : MutableTransitionState, TransitionState { |
| |
| internal val props: MutableMap<PropKey<Any, AnimationVector>, Any> = mutableMapOf() |
| |
| override operator fun <T, V : AnimationVector> set(propKey: PropKey<T, V>, prop: T) { |
| @Suppress("UNCHECKED_CAST") |
| propKey as PropKey<Any, AnimationVector> |
| if (props[propKey] != null) { |
| throw IllegalArgumentException("prop name $propKey already exists") |
| } |
| |
| props[propKey] = prop as Any |
| } |
| |
| @Suppress("UNCHECKED_CAST") |
| override operator fun <T, V : AnimationVector> get(propKey: PropKey<T, V>): T { |
| propKey as PropKey<Any, AnimationVector> |
| return props[propKey] as T |
| } |
| } |
| |
| /** |
| * [TransitionState] holds a number of property values. The value of a property can be queried via |
| * [get], providing its property key. |
| */ |
| interface TransitionState { |
| operator fun <T, V : AnimationVector> get(propKey: PropKey<T, V>): T |
| } |
| |
| /** |
| * [MutableTransitionState] is used in [TransitionDefinition] for constructing various |
| * [TransitionState]s with corresponding properties and their values. |
| */ |
| interface MutableTransitionState { |
| operator fun <T, V : AnimationVector> set(propKey: PropKey<T, V>, prop: T) |
| } |