1 /* 2 * Copyright (C) 2025 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher3.util.window 18 19 import android.content.Context 20 import android.hardware.display.DisplayManager 21 import android.hardware.display.DisplayManager.DisplayListener 22 import android.view.Display.DEFAULT_DISPLAY 23 import com.android.launcher3.dagger.ApplicationContext 24 import com.android.launcher3.dagger.LauncherAppSingleton 25 import com.android.launcher3.dagger.LauncherComponentProvider.appComponent 26 import com.android.launcher3.util.DaggerSingletonTracker 27 import com.android.launcher3.util.Executors 28 import javax.inject.Inject 29 30 /** Utility class to track refresh rate of the current device */ 31 interface RefreshRateTracker { 32 33 val singleFrameMs: Int 34 35 @LauncherAppSingleton 36 class RefreshRateTrackerImpl 37 @Inject 38 constructor(@ApplicationContext ctx: Context, tracker: DaggerSingletonTracker) : 39 RefreshRateTracker, DisplayListener { 40 41 private val displayManager: DisplayManager = <lambda>null42 ctx.getSystemService(DisplayManager::class.java)!!.also { 43 it.registerDisplayListener(this, Executors.UI_HELPER_EXECUTOR.handler) 44 tracker.addCloseable { it.unregisterDisplayListener(this) } 45 } 46 47 override var singleFrameMs: Int = updateSingleFrameMs() 48 updateSingleFrameMsnull49 private fun updateSingleFrameMs(): Int { 50 val refreshRate = displayManager.getDisplay(DEFAULT_DISPLAY)?.refreshRate 51 return if (refreshRate != null && refreshRate > 0) (1000 / refreshRate).toInt() else 16 52 } 53 onDisplayChangednull54 override fun onDisplayChanged(displayId: Int) { 55 if (displayId == DEFAULT_DISPLAY) { 56 singleFrameMs = updateSingleFrameMs() 57 } 58 } 59 onDisplayAddednull60 override fun onDisplayAdded(displayId: Int) {} 61 onDisplayRemovednull62 override fun onDisplayRemoved(displayId: Int) {} 63 } 64 65 companion object { 66 67 /** Returns the single frame time in ms */ getSingleFrameMsnull68 @JvmStatic fun Context.getSingleFrameMs() = appComponent.frameRateProvider.singleFrameMs 69 } 70 } 71