1 /* 2 * Copyright (C) 2021 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.systemui.biometrics 18 19 import android.content.Context 20 import android.hardware.display.DisplayManager 21 import android.hardware.fingerprint.FingerprintSensorPropertiesInternal 22 import android.os.Handler 23 import android.view.Surface 24 import com.android.systemui.biometrics.BiometricDisplayListener.SensorType.Generic 25 26 /** 27 * A listener for keeping overlays for biometric sensors aligned with the physical device 28 * device's screen. The [onChanged] will be dispatched on the [handler] 29 * whenever a relevant change to the device's configuration (orientation, fold, display change, 30 * etc.) may require the UI to change for the given [sensorType]. 31 */ 32 class BiometricDisplayListener( 33 private val context: Context, 34 private val displayManager: DisplayManager, 35 private val handler: Handler, 36 private val sensorType: SensorType = SensorType.Generic, 37 private val onChanged: () -> Unit 38 ) : DisplayManager.DisplayListener { 39 40 private var lastRotation = Surface.ROTATION_0 41 onDisplayAddednull42 override fun onDisplayAdded(displayId: Int) {} onDisplayRemovednull43 override fun onDisplayRemoved(displayId: Int) {} onDisplayChangednull44 override fun onDisplayChanged(displayId: Int) { 45 val rotationChanged = didRotationChange() 46 47 when (sensorType) { 48 is SensorType.SideFingerprint -> onChanged() 49 else -> { 50 if (rotationChanged) { 51 onChanged() 52 } 53 } 54 } 55 } 56 didRotationChangenull57 private fun didRotationChange(): Boolean { 58 val rotation = context.display?.rotation ?: return false 59 val last = lastRotation 60 lastRotation = rotation 61 return last != rotation 62 } 63 64 /** Listen for changes. */ enablenull65 fun enable() { 66 lastRotation = context.display?.rotation ?: Surface.ROTATION_0 67 displayManager.registerDisplayListener( 68 this, 69 handler, 70 DisplayManager.EVENT_FLAG_DISPLAY_CHANGED 71 ) 72 } 73 74 /** Stop listening for changes. */ disablenull75 fun disable() { 76 displayManager.unregisterDisplayListener(this) 77 } 78 79 /** 80 * Type of sensor to determine what kind of display changes require layouts. 81 * 82 * The [Generic] type should be used in cases where the modality can vary, such as 83 * biometric prompt (and this object will likely change as multi-mode auth is added). 84 */ 85 sealed class SensorType { 86 object Generic : SensorType() 87 object UnderDisplayFingerprint : SensorType() 88 data class SideFingerprint( 89 val properties: FingerprintSensorPropertiesInternal 90 ) : SensorType() 91 } 92 } 93