ActivityStack.kt
/*
* Copyright 2021 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.window.embedding
import android.app.Activity
/**
* A container that holds a stack of activities, overlapping and bound to the same rectangle on the
* screen.
*/
class ActivityStack internal constructor(
/**
* The [Activity] list in this application's process that belongs to this [ActivityStack].
*
* Note that Activities that are running in other processes will not be contained in this
* list. They can be in any position in terms of ordering relative to the activities in the
* list.
*/
internal val activitiesInProcess: List<Activity>,
/**
* Whether there is no [Activity] running in this [ActivityStack].
*
* Note that [activitiesInProcess] only report [Activity] in the process used to create this
* ActivityStack. That said, if this ActivityStack only contains activities from other
* process(es), [activitiesInProcess] will return an empty list, but this method will return
* `false`.
*/
val isEmpty: Boolean
) {
/**
* Whether this [ActivityStack] contains the [activity].
*/
operator fun contains(activity: Activity): Boolean {
return activitiesInProcess.contains(activity)
}
override fun equals(other: Any?): Boolean {
if (this === other) return true
if (other !is ActivityStack) return false
if (activitiesInProcess != other.activitiesInProcess) return false
if (isEmpty != other.isEmpty) return false
return true
}
override fun hashCode(): Int {
var result = activitiesInProcess.hashCode()
result = 31 * result + isEmpty.hashCode()
return result
}
override fun toString(): String =
"ActivityStack{" +
"activitiesInProcess=$activitiesInProcess" +
", isEmpty=$isEmpty" +
"}"
}