| /* |
| * Copyright 2019 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.ui.core.ExperimentalLayoutNodeApi |
| import androidx.ui.core.LayoutNode |
| import androidx.ui.semantics.AccessibilityAction |
| import androidx.ui.semantics.SemanticsPropertyKey |
| import androidx.ui.util.fastForEach |
| |
| // TODO(b/142821673): Clean up and integrate this (probably with AndroidComposeView) |
| |
| /** |
| * Owns [SemanticsNode] objects and notifies listeners of changes to the |
| * semantics tree |
| */ |
| @OptIn(ExperimentalLayoutNodeApi::class) |
| class SemanticsOwner(val rootNode: LayoutNode) { |
| /** |
| * The root node of the semantics tree. Does not contain any unmerged data. |
| * May contain merged data. |
| */ |
| val rootSemanticsNode: SemanticsNode |
| get() { |
| return rootNode.outerSemantics!!.semanticsNode() |
| } |
| |
| private fun <T : Function<Boolean>> getSemanticsActionHandlerForId( |
| id: Int, |
| action: SemanticsPropertyKey<AccessibilityAction<T>> |
| ): AccessibilityAction<*>? { |
| var result: SemanticsNode? = rootSemanticsNode.findChildById(id) |
| if (result != null && !result.canPerformAction(action)) { |
| result.visitDescendants { node: SemanticsNode -> |
| if (node.canPerformAction(action)) { |
| result = node |
| return@visitDescendants false // found node, abort walk |
| } |
| return@visitDescendants true // continue walk |
| } |
| } |
| if (result?.canPerformAction(action) != true) { |
| return null |
| } |
| return result!!.unmergedConfig.getOrNull(action) |
| } |
| } |
| |
| /** |
| * Finds all [SemanticsNode]s in the tree owned by this [SemanticsOwner]. Return the results in a |
| * list. |
| */ |
| fun SemanticsOwner.getAllSemanticsNodes(): List<SemanticsNode> { |
| return getAllSemanticsNodesToMap().values.toList() |
| } |
| |
| /** |
| * Finds all [SemanticsNode]s in the tree owned by this [SemanticsOwner]. Return the results in a |
| * map. |
| */ |
| internal fun SemanticsOwner.getAllSemanticsNodesToMap(): Map<Int, SemanticsNode> { |
| val nodes = mutableMapOf<Int, SemanticsNode>() |
| |
| fun findAllSemanticNodesRecursive(currentNode: SemanticsNode) { |
| nodes[currentNode.id] = currentNode |
| currentNode.children.fastForEach { child -> |
| findAllSemanticNodesRecursive(child) |
| } |
| } |
| |
| findAllSemanticNodesRecursive(rootSemanticsNode) |
| return nodes |
| } |