AndroidAccessibilityManager.kt

/*
 * Copyright 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 androidx.compose.ui.platform

import android.content.Context
import android.os.Build
import androidx.annotation.DoNotInline
import androidx.annotation.RequiresApi

/**
 * Android implementation for [AccessibilityManager].
 */
internal class AndroidAccessibilityManager(context: Context) : AccessibilityManager {
    private companion object {
        const val FlagContentIcons = 1
        const val FlagContentText = 2
        const val FlagContentControls = 4
    }
    private val accessibilityManager = context.getSystemService(Context.ACCESSIBILITY_SERVICE) as
        android.view.accessibility.AccessibilityManager

    override fun calculateRecommendedTimeoutMillis(
        originalTimeoutMillis: Long,
        containsIcons: Boolean,
        containsText: Boolean,
        containsControls: Boolean
    ): Long {
        if (originalTimeoutMillis >= Int.MAX_VALUE) {
            return originalTimeoutMillis
        }
        var uiContentFlags = 0
        if (containsIcons) {
            uiContentFlags = uiContentFlags or FlagContentIcons
        }
        if (containsText) {
            uiContentFlags = uiContentFlags or FlagContentText
        }
        if (containsControls) {
            uiContentFlags = uiContentFlags or FlagContentControls
        }
        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            val recommended = Api29Impl.getRecommendedTimeoutMillis(
                accessibilityManager,
                originalTimeoutMillis.toInt(),
                uiContentFlags
            )
            if (recommended == Int.MAX_VALUE) {
                Long.MAX_VALUE
            } else {
                recommended.toLong()
            }
        } else if (containsControls && accessibilityManager.isTouchExplorationEnabled) {
            Long.MAX_VALUE
        } else {
            originalTimeoutMillis
        }
    }
}

/**
 * This class is here to ensure that the classes that use this API will get verified and can be
 * AOT compiled. It is expected that this class will soft-fail verification, but the classes
 * which use this method will pass.
 */
@RequiresApi(Build.VERSION_CODES.Q)
internal object Api29Impl {
    @DoNotInline
    fun getRecommendedTimeoutMillis(
        accessibilityManager: android.view.accessibility.AccessibilityManager,
        originalTimeout: Int,
        uiContentFlags: Int
    ): Int {
        return accessibilityManager.getRecommendedTimeoutMillis(originalTimeout, uiContentFlags)
    }
}