| /* |
| * Copyright 2020 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.ui.core.semantics |
| |
| import androidx.compose.runtime.remember |
| import androidx.ui.core.AtomicInt |
| import androidx.ui.core.Modifier |
| import androidx.ui.core.composed |
| import androidx.ui.semantics.SemanticsPropertyReceiver |
| |
| /** |
| * A [Modifier.Element] that adds semantics key/value for use in testing, |
| * accessibility, and similar use cases. |
| */ |
| interface SemanticsModifier : Modifier.Element { |
| /** |
| * The unique id of this semantics. |
| * |
| * Should be generated from SemanticsModifierCore.generateSemanticsId(). |
| */ |
| val id: Int |
| |
| /** |
| * The SemanticsConfiguration holds substantive data, especially a list of key/value pairs |
| * such as (label -> "buttonName"). |
| */ |
| val semanticsConfiguration: SemanticsConfiguration |
| } |
| |
| internal class SemanticsModifierCore( |
| override val id: Int, |
| mergeAllDescendants: Boolean, |
| properties: (SemanticsPropertyReceiver.() -> Unit) |
| ) : SemanticsModifier { |
| override val semanticsConfiguration: SemanticsConfiguration = |
| SemanticsConfiguration().also { |
| it.isMergingSemanticsOfDescendants = mergeAllDescendants |
| |
| it.properties() |
| } |
| companion object { |
| private var lastIdentifier = AtomicInt(0) |
| fun generateSemanticsId() = lastIdentifier.addAndGet(1) |
| } |
| } |
| |
| /** |
| * Add semantics key/value for use in testing, accessibility, and similar use cases. |
| * |
| * @param mergeAllDescendants Whether the semantic information provided by the owning component and |
| * all of its descendants should be treated as one logical entity. |
| * @param properties properties to add to the semantics. [SemanticsPropertyReceiver] will be |
| * provided in the scope to allow access for common properties and its values. |
| */ |
| fun Modifier.semantics( |
| mergeAllDescendants: Boolean = false, |
| properties: (SemanticsPropertyReceiver.() -> Unit) |
| ): Modifier = composed { |
| val id = remember { SemanticsModifierCore.generateSemanticsId() } |
| SemanticsModifierCore(id, mergeAllDescendants, properties) |
| } |