All files / lib/checkbox-group checkbox-group.component.ts

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/*******************************************************************************
 * Copyright bei
 * Entwicklungs- und Pflegeverbund für das gemeinsame Fachverfahren gefa
 *
 *******************************************************************************/
 
import { AfterViewInit, Component, ElementRef, EventEmitter, Input, NgZone, OnChanges, OnDestroy, Output, QueryList, SimpleChanges, ViewChild, ViewChildren } from '@angular/core';
 
import { Callback, Converter, FocusableElementOwner, Item, WidgetKeySet } from '../utils/util.types';
import { createWidgetKeySet, isItem, itemTrack } from '../utils/utilities';
import { isSetEqual, observeSize } from '../utils/internal-utils';
import { CheckboxComponent } from '../checkbox/checkbox.component';
 
/**
 * A Checkbox Group element that allows the user to mark an arbitrary number of values as
 * selected from a set of different checkboxes.
 */
@Component({
  selector: 'gc-checkbox-group',
  templateUrl: './checkbox-group.component.html',
  styleUrls: [ './checkbox-group.component.css' ]
})
export class CheckboxGroupComponent<T, I extends Item = Item> implements OnChanges, AfterViewInit, OnDestroy, FocusableElementOwner {
 
  /**
   * Custom id to use.
   * @deprecated
   */
  @Input()
  public _id?: string;
 
  /**
   * Text that shows within the checkbox group border.
   */
  @Input()
  public label = '';
 
  /**
   * List of items that will be rendered as checkboxes.
   */
  @Input()
  public items: readonly T[] = [];
 
  /**
   * Adapter that manages the conversion of item types.
   */
  @Input()
  public itemAdapter?: Converter<T, I>;
 
  /**
   * Keys of items which are in the readonly mode.
   */
  @Input()
  public readonlyItems?: ReadonlySet<string>;
 
  /**
   * Keys of items which are in the disabled mode.
   */
  @Input()
  public disabledItems?: ReadonlySet<string>;
 
  /**
   * An error message that shows within a checkbox.
   */
  @Input()
  public errorMessage = '';
 
  /**
   * Inform about the change of the value
   */
  @Output()
  public readonly valueChange: EventEmitter<ReadonlySet<T>> = new EventEmitter<ReadonlySet<T>>();
 
  /**
   * @ignore
   */
  @ViewChild('error')
  private errorMessageElement?: ElementRef<HTMLParagraphElement>;
 
  /**
   * @ignore
   */
  @ViewChildren(CheckboxComponent)
  private  checkboxElements?: QueryList<CheckboxComponent>;
 
  /**
   * Set of checked items.
   */
  @Input()
  public get value() : ReadonlySet<T> {
    return this._value;
  }
 
  public set value(items: ReadonlySet<T>) {
    this._value = items;
  }
 
  /** @ignore */
  readonly _widgetKeys: WidgetKeySet = createWidgetKeySet('checkbox-group');
 
  /**
   * @ignore
   */
  _convertedItems: readonly Item[] = [];
 
  /**
   * @ignore
   */
  public _numberOfColumns: 1 | 2 | 3 = 1;
 
  /**
   * @ignore
   */
  private _value: ReadonlySet<T> = new Set();
 
  /**
   * @ignore
   */
  private resizeObserver?: Callback;
 
  constructor(private el: ElementRef<HTMLFieldSetElement>, private zone: NgZone) {}
 
  /**
   * @ignore
   */
  public _itemTrackBy(index: number, item: Item): string {
    return itemTrack(item);
  }
 
  /**
   * @ignore
   */
  ngOnChanges(changes: SimpleChanges): void {
    this.convertItems();
    if (changes.items) {
      setTimeout(() => {
        this.updateValue(new Set(this.items.filter(i => this._isChecked(this.getAsItem(i).key))));
      });
    }
 
    if(this.errorMessage.length > 0) {
      this.setErrorMessageProviderToInputs();
    }
  }
 
  /**
   * @ignore
   */
  ngAfterViewInit(): void {
    this.resizeObserver = observeSize(this.el, this.zone, this.resizeObserverCallback.bind(this));
  }
 
  /**
   * @ignore
   */
  ngOnDestroy(): void {
    if(this.resizeObserver) {
      this.resizeObserver();
    }
  }
 
  public focusChild(): boolean {
    if(this.checkboxElements) {
      const firstNonDisabledElement = this.checkboxElements.find(el => !el.disabled);
 
      if(firstNonDisabledElement) {
        return firstNonDisabledElement.focusChild();
      } else {
        return false;
      }
    }
 
    return false;
  }
 
  /**
   * @ignore
   */
  _valueChanged(key: string, checked: boolean): void {
    const foundValue = this.findValueByKey(key);
 
    if (foundValue) {
      if (checked) {
        this.updateValue(new Set([ ...this.value, foundValue ]));
      } else {
        this.updateValue(new Set(Array.from(this.value).filter(val => foundValue != val)));
      }
    }
  }
 
  /**
   * @ignore
   */
  public _isChecked(key: string): boolean {
    const foundItem = Array.from(this.value).find(i => this.getAsItem(i).key == key);
    return foundItem !== undefined;
  }
 
  /**
   * @ignore
   */
  public _computeCellRow(item : Item): null | number {
    if( this._numberOfColumns === 1 ) {
      return null;
    } else {
      const itemsPerColumn = Math.ceil(this._convertedItems.length / this._numberOfColumns);
      const idx = this._convertedItems.indexOf(item);
      if( idx !== undefined ) {
        return idx % itemsPerColumn + 1;
      }
      return null;
    }
  }
 
  /**
   * @ignore
   */
  private convertItems() {
    this._convertedItems = Array.from(this.items).map(i => this.getAsItem(i));
  }
 
  /**
   * @ignore
   */
  private findValueByKey(key: string): T | null {
    const foundVal = Array.from(this.items).find(i => this.getAsItem(i).key == key);

    return foundVal ? foundVal : null;
  }
 
  /**
   * @ignore
   */
  private getAsItem(item: T): Item {
    if( this.itemAdapter === undefined ) {
      if(isItem(item)){
        return item;
      }
      throw new Error( 'missing converter' );
    } else {
      return this.itemAdapter(item);
    }
  }
 
  /**
   * @ignore
   */
  private setErrorMessageProviderToInputs(): void {
    if(this.errorMessageElement ){
      const errorProvider = this.errorMessageElement.nativeElement.getAttribute('id');

      this.checkboxElements?.toArray().forEach(el => {
        if(errorProvider && this.checkboxElements) {
          el._inputElement.nativeElement.setAttribute('errormessage', errorProvider);
        }
      });
    }
  }
 
  /**
   * @ignore
   */
  private resizeObserverCallback(): void {
    const elementWidth = this.el.nativeElement.getBoundingClientRect().width;
 
    if(elementWidth < 440) {
      this._numberOfColumns = 1;
    }
 
    if(elementWidth > 440 && elementWidth < 760) {
      this._numberOfColumns = 2;
    }
 
    if(elementWidth > 761) {
      this._numberOfColumns = 3;
    }
 
    if(this.items.length <= 4) {
      this._numberOfColumns = 1;
    }
  }
 
  /**
   * @ignore
   */
  private updateValue(value: ReadonlySet<T>): void {
    if(!isSetEqual(this.value, value) ) {
      this.value = value;
      this.valueChange.emit(value);
    }
  }
}