ActivityExt.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
import android.app.Activity
import android.os.IBinder
import android.os.Looper
import kotlinx.coroutines.ExperimentalCoroutinesApi
/**
* A utility method [Activity] to return an optional [IBinder] window token from an [Activity].
*/
internal fun getActivityWindowToken(activity: Activity?): IBinder? {
return activity?.window?.attributes?.token
}
internal inline fun <reified T> Activity.getTag(id: Int): T? {
return window.decorView.getTag(id) as? T
}
/**
* Checks to see if an object of type [T] is associated with the tag [id]. If it is available
* then it is returned. Otherwise set an object crated using the [producer] and return that value.
* @return object associated with the tag.
*/
internal inline fun <reified T> Activity.getOrCreateTag(id: Int, producer: () -> T): T {
return (window.decorView.getTag(id) as? T) ?: run {
assert(Looper.getMainLooper() == Looper.myLooper())
val value = producer()
window.decorView.setTag(id, value)
value
}
}
/**
* Provide an instance of [WindowInfoRepo] that is associated to the given [Activity]
*/
@ExperimentalCoroutinesApi
public fun Activity.windowInfoRepository(): WindowInfoRepo {
return WindowInfoRepo.create(this)
}