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/*
* Copyright (C) 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 com.android.systemui.statusbar.window
import android.app.StatusBarManager
import android.app.StatusBarManager.WindowVisibleState
import android.app.StatusBarManager.WINDOW_STATE_SHOWING
import android.app.StatusBarManager.WINDOW_STATUS_BAR
import android.app.StatusBarManager.windowStateToString
import android.util.Log
import com.android.systemui.dagger.SysUISingleton
import com.android.systemui.dagger.qualifiers.DisplayId
import com.android.systemui.statusbar.CommandQueue
import com.android.systemui.statusbar.phone.CentralSurfaces
import javax.inject.Inject
/**
* A centralized class maintaining the state of the status bar window.
*
* Classes that want to get updates about the status bar window state should subscribe to this class
* via [addListener] and should NOT add their own callback on [CommandQueue].
*/
@SysUISingleton
class StatusBarWindowStateController @Inject constructor(
@DisplayId private val thisDisplayId: Int,
commandQueue: CommandQueue
) {
private val commandQueueCallback = object : CommandQueue.Callbacks {
override fun setWindowState(
displayId: Int,
@StatusBarManager.WindowType window: Int,
@WindowVisibleState state: Int
) {
this@StatusBarWindowStateController.setWindowState(displayId, window, state)
}
}
private val listeners: MutableSet<StatusBarWindowStateListener> = HashSet()
@WindowVisibleState private var windowState: Int = WINDOW_STATE_SHOWING
init {
commandQueue.addCallback(commandQueueCallback)
}
/** Adds a listener. */
fun addListener(listener: StatusBarWindowStateListener) {
listeners.add(listener)
}
fun removeListener(listener: StatusBarWindowStateListener) {
listeners.remove(listener)
}
/** Returns true if the window is currently showing. */
fun windowIsShowing() = windowState == WINDOW_STATE_SHOWING
private fun setWindowState(
displayId: Int,
@StatusBarManager.WindowType window: Int,
@WindowVisibleState state: Int
) {
if (displayId != thisDisplayId) {
return
}
if (window != WINDOW_STATUS_BAR) {
return
}
if (windowState == state) {
return
}
windowState = state
if (CentralSurfaces.DEBUG_WINDOW_STATE) {
Log.d(CentralSurfaces.TAG, "Status bar " + windowStateToString(state))
}
listeners.forEach { it.onStatusBarWindowStateChanged(state) }
}
}
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