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/*
* Copyright (C) 2022 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 com.android.systemui.settings
import android.hardware.display.DisplayManager
import android.hardware.display.DisplayManager.EVENT_FLAG_DISPLAY_BRIGHTNESS
import android.os.Handler
import android.view.Display
import androidx.annotation.GuardedBy
import androidx.annotation.VisibleForTesting
import androidx.annotation.WorkerThread
import com.android.systemui.dagger.qualifiers.Background
import com.android.systemui.util.Assert
import java.lang.ref.WeakReference
import java.util.concurrent.Executor
class DisplayTrackerImpl
internal constructor(
val displayManager: DisplayManager,
@Background val backgroundHandler: Handler
) : DisplayTracker {
override val defaultDisplayId: Int = Display.DEFAULT_DISPLAY
override val allDisplays: Array<Display>
get() = displayManager.displays
@GuardedBy("displayCallbacks")
private val displayCallbacks: MutableList<DisplayTrackerDataItem> = ArrayList()
@GuardedBy("brightnessCallbacks")
private val brightnessCallbacks: MutableList<DisplayTrackerDataItem> = ArrayList()
@VisibleForTesting
val displayChangedListener: DisplayManager.DisplayListener =
object : DisplayManager.DisplayListener {
override fun onDisplayAdded(displayId: Int) {
val list = synchronized(displayCallbacks) { displayCallbacks.toList() }
onDisplayAdded(displayId, list)
}
override fun onDisplayRemoved(displayId: Int) {
val list = synchronized(displayCallbacks) { displayCallbacks.toList() }
onDisplayRemoved(displayId, list)
}
override fun onDisplayChanged(displayId: Int) {
val list = synchronized(displayCallbacks) { displayCallbacks.toList() }
onDisplayChanged(displayId, list)
}
}
@VisibleForTesting
val displayBrightnessChangedListener: DisplayManager.DisplayListener =
object : DisplayManager.DisplayListener {
override fun onDisplayAdded(displayId: Int) {}
override fun onDisplayRemoved(displayId: Int) {}
override fun onDisplayChanged(displayId: Int) {
val list = synchronized(brightnessCallbacks) { brightnessCallbacks.toList() }
onDisplayChanged(displayId, list)
}
}
override fun addDisplayChangeCallback(callback: DisplayTracker.Callback, executor: Executor) {
synchronized(displayCallbacks) {
if (displayCallbacks.isEmpty()) {
displayManager.registerDisplayListener(displayChangedListener, backgroundHandler)
}
displayCallbacks.add(DisplayTrackerDataItem(WeakReference(callback), executor))
}
}
override fun addBrightnessChangeCallback(
callback: DisplayTracker.Callback,
executor: Executor
) {
synchronized(brightnessCallbacks) {
if (brightnessCallbacks.isEmpty()) {
displayManager.registerDisplayListener(
displayBrightnessChangedListener,
backgroundHandler,
EVENT_FLAG_DISPLAY_BRIGHTNESS
)
}
brightnessCallbacks.add(DisplayTrackerDataItem(WeakReference(callback), executor))
}
}
override fun removeCallback(callback: DisplayTracker.Callback) {
synchronized(displayCallbacks) {
val changed = displayCallbacks.removeIf { it.sameOrEmpty(callback) }
if (changed && displayCallbacks.isEmpty()) {
displayManager.unregisterDisplayListener(displayChangedListener)
}
}
synchronized(brightnessCallbacks) {
val changed = brightnessCallbacks.removeIf { it.sameOrEmpty(callback) }
if (changed && brightnessCallbacks.isEmpty()) {
displayManager.unregisterDisplayListener(displayBrightnessChangedListener)
}
}
}
@WorkerThread
private fun onDisplayAdded(displayId: Int, list: List<DisplayTrackerDataItem>) {
Assert.isNotMainThread()
notifySubscribers({ onDisplayAdded(displayId) }, list)
}
@WorkerThread
private fun onDisplayRemoved(displayId: Int, list: List<DisplayTrackerDataItem>) {
Assert.isNotMainThread()
notifySubscribers({ onDisplayRemoved(displayId) }, list)
}
@WorkerThread
private fun onDisplayChanged(displayId: Int, list: List<DisplayTrackerDataItem>) {
Assert.isNotMainThread()
notifySubscribers({ onDisplayChanged(displayId) }, list)
}
private inline fun notifySubscribers(
crossinline action: DisplayTracker.Callback.() -> Unit,
list: List<DisplayTrackerDataItem>
) {
list.forEach {
if (it.callback.get() != null) {
it.executor.execute { it.callback.get()?.action() }
}
}
}
private data class DisplayTrackerDataItem(
val callback: WeakReference<DisplayTracker.Callback>,
val executor: Executor
) {
fun sameOrEmpty(other: DisplayTracker.Callback): Boolean {
return callback.get()?.equals(other) ?: true
}
}
}
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