@angular/cdk
Version:
Angular Material Component Development Kit
59 lines • 8.56 kB
JavaScript
import { __read, __spread } from "tslib";
/**
* @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 { SelectionModel } from '@angular/cdk/collections';
/** Base tree control. It has basic toggle/expand/collapse operations on a single data node. */
var BaseTreeControl = /** @class */ (function () {
function BaseTreeControl() {
/** A selection model with multi-selection to track expansion status. */
this.expansionModel = new SelectionModel(true);
}
/** Toggles one single data node's expanded/collapsed state. */
BaseTreeControl.prototype.toggle = function (dataNode) {
this.expansionModel.toggle(dataNode);
};
/** Expands one single data node. */
BaseTreeControl.prototype.expand = function (dataNode) {
this.expansionModel.select(dataNode);
};
/** Collapses one single data node. */
BaseTreeControl.prototype.collapse = function (dataNode) {
this.expansionModel.deselect(dataNode);
};
/** Whether a given data node is expanded or not. Returns true if the data node is expanded. */
BaseTreeControl.prototype.isExpanded = function (dataNode) {
return this.expansionModel.isSelected(dataNode);
};
/** Toggles a subtree rooted at `node` recursively. */
BaseTreeControl.prototype.toggleDescendants = function (dataNode) {
this.expansionModel.isSelected(dataNode)
? this.collapseDescendants(dataNode)
: this.expandDescendants(dataNode);
};
/** Collapse all dataNodes in the tree. */
BaseTreeControl.prototype.collapseAll = function () {
this.expansionModel.clear();
};
/** Expands a subtree rooted at given data node recursively. */
BaseTreeControl.prototype.expandDescendants = function (dataNode) {
var _a;
var toBeProcessed = [dataNode];
toBeProcessed.push.apply(toBeProcessed, __spread(this.getDescendants(dataNode)));
(_a = this.expansionModel).select.apply(_a, __spread(toBeProcessed));
};
/** Collapses a subtree rooted at given data node recursively. */
BaseTreeControl.prototype.collapseDescendants = function (dataNode) {
var _a;
var toBeProcessed = [dataNode];
toBeProcessed.push.apply(toBeProcessed, __spread(this.getDescendants(dataNode)));
(_a = this.expansionModel).deselect.apply(_a, __spread(toBeProcessed));
};
return BaseTreeControl;
}());
export { BaseTreeControl };
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