1/*
2 * Copyright (C) 2024 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
17import {Operation} from 'trace/tree_node/operations/operation';
18import {UiHierarchyTreeNode} from 'viewers/common/ui_hierarchy_tree_node';
19
20export class FlattenChildren implements Operation<UiHierarchyTreeNode> {
21  apply(node: UiHierarchyTreeNode): void {
22    const flattenedChildren = this.extractFlattenedChildren(node);
23
24    node.removeAllChildren();
25    flattenedChildren.forEach((child) => {
26      child.removeAllChildren();
27      node.addOrReplaceChild(child);
28    });
29  }
30
31  private extractFlattenedChildren(
32    node: UiHierarchyTreeNode,
33  ): UiHierarchyTreeNode[] {
34    const children: UiHierarchyTreeNode[] = [];
35    node.getAllChildren().forEach((child) => {
36      children.push(child);
37      children.push(...this.extractFlattenedChildren(child));
38    });
39    return children;
40  }
41}
42