@angular/cdk
Version:
Angular Material Component Development Kit
70 lines • 6.42 kB
JavaScript
/**
* @fileoverview added by tsickle
* Generated from: src/cdk/tree/control/flat-tree-control.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { BaseTreeControl } from './base-tree-control';
/**
* Flat tree control. Able to expand/collapse a subtree recursively for flattened tree.
* @template T
*/
export class FlatTreeControl extends BaseTreeControl {
/**
* Construct with flat tree data node functions getLevel and isExpandable.
* @param {?} getLevel
* @param {?} isExpandable
*/
constructor(getLevel, isExpandable) {
super();
this.getLevel = getLevel;
this.isExpandable = isExpandable;
}
/**
* Gets a list of the data node's subtree of descendent data nodes.
*
* To make this working, the `dataNodes` of the TreeControl must be flattened tree nodes
* with correct levels.
* @param {?} dataNode
* @return {?}
*/
getDescendants(dataNode) {
/** @type {?} */
const startIndex = this.dataNodes.indexOf(dataNode);
/** @type {?} */
const results = [];
// Goes through flattened tree nodes in the `dataNodes` array, and get all descendants.
// The level of descendants of a tree node must be greater than the level of the given
// tree node.
// If we reach a node whose level is equal to the level of the tree node, we hit a sibling.
// If we reach a node whose level is greater than the level of the tree node, we hit a
// sibling of an ancestor.
for (let i = startIndex + 1; i < this.dataNodes.length && this.getLevel(dataNode) < this.getLevel(this.dataNodes[i]); i++) {
results.push(this.dataNodes[i]);
}
return results;
}
/**
* Expands all data nodes in the tree.
*
* To make this working, the `dataNodes` variable of the TreeControl must be set to all flattened
* data nodes of the tree.
* @return {?}
*/
expandAll() {
this.expansionModel.select(...this.dataNodes);
}
}
if (false) {
/** @type {?} */
FlatTreeControl.prototype.getLevel;
/** @type {?} */
FlatTreeControl.prototype.isExpandable;
}
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