clr-angular-static-fix/data/tree-view/abstract-tree-selection.ts

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/*
 * Copyright (c) 2016-2018 VMware, Inc. All Rights Reserved.
 * This software is released under MIT license.
 * The full license information can be found in LICENSE in the root directory of this project.
 */

export abstract class AbstractTreeSelection {
  constructor(public parent: AbstractTreeSelection) {}

  abstract get children(): AbstractTreeSelection[];

  abstract selectedChanged(): void;
  abstract indeterminateChanged(): void;

  private _selected: boolean = false;
  private _indeterminate: boolean = false;

  public get selected(): boolean {
    return this._selected;
  }

  public set selected(value: boolean) {
    this._selected = value;
    this.indeterminate = false;
    this.children.forEach(child => child.parentChanged(value));
    if (this.parent) {
      this.parent.childChanged();
    }
    this.selectedChanged();
  }

  public get indeterminate(): boolean {
    return this._indeterminate;
  }

  public set indeterminate(value: boolean) {
    value = !!value;
    if (this._indeterminate !== value) {
      this._indeterminate = value;
      this.indeterminateChanged();
    }
  }

  childChanged(): void {
    let oneSelectedChild = false;
    const previousSelectedValue: boolean = this._selected;
    const previousIndeterminateValue: boolean = this._indeterminate;
    this._selected = true;
    this._indeterminate = false;

    for (const child of this.children) {
      if (child.indeterminate) {
        this._selected = false;
        this._indeterminate = true;
        break;
      }
      if (child.selected) {
        oneSelectedChild = true;
        if (this._selected === false) {
          this._indeterminate = true;
          break;
        }
      } else {
        this._selected = false;
        if (oneSelectedChild) {
          this._indeterminate = true;
          break;
        }
      }
    }

    if (
      this.parent &&
      (this._selected !== previousSelectedValue || this._indeterminate !== previousIndeterminateValue)
    ) {
      this.parent.childChanged();
    }

    if (this.selected !== previousSelectedValue) {
      this.selectedChanged();
    }

    if (this.indeterminate !== previousIndeterminateValue) {
      this.indeterminateChanged();
    }
  }

  parentChanged(selected: boolean) {
    if (selected && !this.selected) {
      this._selected = true;
      this.indeterminate = false;
      this.children.forEach(child => child.parentChanged(true));
      this.selectedChanged();
    }
    if (!selected && (this.selected || this.indeterminate)) {
      this._selected = false;
      this.indeterminate = false;
      this.children.forEach(child => child.parentChanged(false));
      this.selectedChanged();
    }
  }
}