99 lines
3.1 KiB
Kotlin
99 lines
3.1 KiB
Kotlin
/*
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* Copyright (C) 2019 Electric Coin Company
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*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* This file has been modified by Electric Coin Company to translate it into Kotlin and add support for Firebase vision.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cash.z.android.cameraview
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import android.content.Context
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import android.util.SparseIntArray
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import android.view.Display
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import android.view.OrientationEventListener
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import android.view.Surface
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/**
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* Monitors the value returned from [Display.getRotation].
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*/
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internal abstract class DisplayOrientationDetector(context: Context) {
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private val mOrientationEventListener: OrientationEventListener
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var mDisplay: Display? = null
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var lastKnownDisplayOrientation = 0
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private set
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init {
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mOrientationEventListener = object : OrientationEventListener(context) {
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/** This is either Surface.Rotation_0, _90, _180, _270, or -1 (invalid). */
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private var mLastKnownRotation = -1
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override fun onOrientationChanged(orientation: Int) {
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if (orientation == OrientationEventListener.ORIENTATION_UNKNOWN || mDisplay == null) {
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return
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}
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val rotation = mDisplay!!.rotation
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if (mLastKnownRotation != rotation) {
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mLastKnownRotation = rotation
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dispatchOnDisplayOrientationChanged(DISPLAY_ORIENTATIONS.get(rotation))
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}
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}
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}
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}
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fun enable(display: Display) {
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mDisplay = display
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mOrientationEventListener.enable()
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// Immediately dispatch the first callback
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dispatchOnDisplayOrientationChanged(DISPLAY_ORIENTATIONS.get(display.rotation))
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}
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fun disable() {
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mOrientationEventListener.disable()
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mDisplay = null
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}
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fun dispatchOnDisplayOrientationChanged(displayOrientation: Int) {
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lastKnownDisplayOrientation = displayOrientation
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onDisplayOrientationChanged(displayOrientation)
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}
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/**
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* Called when display orientation is changed.
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*
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* @param displayOrientation One of 0, 90, 180, and 270.
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*/
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abstract fun onDisplayOrientationChanged(displayOrientation: Int)
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companion object {
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/** Mapping from Surface.Rotation_n to degrees. */
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val DISPLAY_ORIENTATIONS = SparseIntArray()
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init {
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DISPLAY_ORIENTATIONS.put(Surface.ROTATION_0, 0)
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DISPLAY_ORIENTATIONS.put(Surface.ROTATION_90, 90)
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DISPLAY_ORIENTATIONS.put(Surface.ROTATION_180, 180)
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DISPLAY_ORIENTATIONS.put(Surface.ROTATION_270, 270)
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}
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}
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}
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