@clr/angular
Version:
Angular components for Clarity
198 lines • 24 kB
JavaScript
/*
* Copyright (c) 2016-2023 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.
*/
import { Component, ContentChildren, EventEmitter, HostListener, Input, Output, } from '@angular/core';
import { Keys } from '../../enums/keys.enum';
import { ClrFocusDirection } from './enums/focus-direction.enum';
import { ClrKeyFocusItem } from './key-focus-item';
import { normalizeKey, preventArrowKeyScroll } from './util';
import * as i0 from "@angular/core";
export class ClrKeyFocus {
constructor(elementRef) {
this.elementRef = elementRef;
this.direction = ClrFocusDirection.VERTICAL;
this.focusOnLoad = false;
this.subscriptions = [];
this.focusChange = new EventEmitter();
this._current = 0;
}
/**
* Here we use `any` cause any other type require reworking all methods below and a lot of more ifs.
* this method will only work with array with FocusableItems anyway so any other value will be ignored.
*/
get focusableItems() {
if (this._focusableItems) {
return this._focusableItems;
}
else if (this.clrKeyFocusItems) {
return this.clrKeyFocusItems.toArray();
}
return [];
}
set focusableItems(elements) {
// We accept a list of focusable elements (HTMLElements or existing Directives) or auto query for clrKeyFocusItem
// We accept a list reference in the cases where we cannot use ContentChildren to query
// ContentChildren can be unavailable if content is projected outside the scope of the component (see tabs).
if (Array.isArray(elements) && elements.length) {
this._focusableItems = elements;
this.initializeFocus();
}
}
get nativeElement() {
return this.elementRef.nativeElement;
}
get current() {
return this._current;
}
set current(value) {
if (this._current !== value) {
this._current = value;
}
}
get currentItem() {
return this.focusableItems[this._current];
}
get currentItemElement() {
return this.currentItem.nativeElement ? this.currentItem.nativeElement : this.currentItem;
}
ngAfterContentInit() {
this.subscriptions.push(this.listenForItemUpdates());
this.initializeFocus();
}
ngOnDestroy() {
this.subscriptions.forEach(s => s.unsubscribe());
}
handleKeyboardEvent(event) {
// Make sure event was originated on the current item's element
if (this.currentItemElement !== event.target) {
const position = this.getItemPosition(event.target);
if (this.positionInRange(position)) {
this.current = position;
}
}
if (this.prevKeyPressed(event) && this.currentFocusIsNotFirstItem()) {
this.moveTo(this.current - 1);
}
else if (this.nextKeyPressed(event) && this.currentFocusIsNotLastItem()) {
this.moveTo(this.current + 1);
}
else if (event.code === Keys.Home) {
this.moveTo(0);
}
else if (event.code === Keys.End) {
this.moveTo(this.focusableItems.length - 1);
}
preventArrowKeyScroll(event);
}
setClickedItemCurrent(event) {
const position = this.getItemPosition(event.target);
if (position > -1) {
this.moveTo(position);
}
}
focusCurrent() {
this.currentItem.focus();
this.focusChange.next(this._current);
}
moveTo(position) {
if (this.positionInRange(position)) {
this.current = position;
this.focusCurrent();
}
}
positionInRange(position) {
return position >= 0 && position < this.focusableItems.length;
}
currentFocusIsNotFirstItem() {
return this._current - 1 >= 0;
}
currentFocusIsNotLastItem() {
return this._current + 1 < this.focusableItems.length;
}
initializeFocus() {
if (this.focusableItems && this.focusableItems.length) {
// It is possible that the focus was on an element, whose index is no longer available.
// This can happen when some of the focusable elements are being removed.
// In such cases, the new focus is initialized on the last focusable element.
if (this._current >= this.focusableItems.length) {
this._current = this.focusableItems.length - 1;
}
if (this.focusOnLoad) {
this.currentItem.focus();
this.focusChange.next();
}
}
}
nextKeyPressed(event) {
const key = normalizeKey(event.key);
switch (this.direction) {
case ClrFocusDirection.VERTICAL:
return key === Keys.ArrowDown;
case ClrFocusDirection.HORIZONTAL:
return key === Keys.ArrowRight;
case ClrFocusDirection.BOTH:
return key === Keys.ArrowDown || key === Keys.ArrowRight;
default:
return false;
}
}
prevKeyPressed(event) {
const key = normalizeKey(event.key);
switch (this.direction) {
case ClrFocusDirection.VERTICAL:
return key === Keys.ArrowUp;
case ClrFocusDirection.HORIZONTAL:
return key === Keys.ArrowLeft;
case ClrFocusDirection.BOTH:
return key === Keys.ArrowUp || key === Keys.ArrowLeft;
default:
return false;
}
}
getItemPosition(item) {
if (this._focusableItems) {
return this.focusableItems.indexOf(item);
}
else {
return this.focusableItems.map(_item => _item.nativeElement).indexOf(item);
}
}
listenForItemUpdates() {
return this.clrKeyFocusItems.changes.subscribe(() => {
this.initializeFocus();
});
}
}
ClrKeyFocus.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: ClrKeyFocus, deps: [{ token: i0.ElementRef }], target: i0.ɵɵFactoryTarget.Component });
ClrKeyFocus.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "14.0.0", version: "15.2.2", type: ClrKeyFocus, selector: "[clrKeyFocus]", inputs: { direction: ["clrDirection", "direction"], focusOnLoad: ["clrFocusOnLoad", "focusOnLoad"], focusableItems: ["clrKeyFocus", "focusableItems"] }, outputs: { focusChange: "clrFocusChange" }, host: { listeners: { "keydown": "handleKeyboardEvent($event)", "click": "setClickedItemCurrent($event)" } }, queries: [{ propertyName: "clrKeyFocusItems", predicate: ClrKeyFocusItem, descendants: true }], ngImport: i0, template: '<ng-content></ng-content>', isInline: true });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: ClrKeyFocus, decorators: [{
type: Component,
args: [{
selector: '[clrKeyFocus]',
template: '<ng-content></ng-content>',
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }]; }, propDecorators: { direction: [{
type: Input,
args: ['clrDirection']
}], focusOnLoad: [{
type: Input,
args: ['clrFocusOnLoad']
}], clrKeyFocusItems: [{
type: ContentChildren,
args: [ClrKeyFocusItem, { descendants: true }]
}], focusChange: [{
type: Output,
args: ['clrFocusChange']
}], focusableItems: [{
type: Input,
args: ['clrKeyFocus']
}], handleKeyboardEvent: [{
type: HostListener,
args: ['keydown', ['$event']]
}], setClickedItemCurrent: [{
type: HostListener,
args: ['click', ['$event']]
}] } });
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* Copyright (c) 2016-2023 VMware, Inc. All Rights Reserved.\n * This software is released under MIT license.\n * The full license information can be found in LICENSE in the root directory of this project.\n */\n\nimport {\n  Component,\n  ContentChildren,\n  ElementRef,\n  EventEmitter,\n  HostListener,\n  Input,\n  Output,\n  QueryList,\n} from '@angular/core';\nimport { Subscription } from 'rxjs';\n\nimport { Keys } from '../../enums/keys.enum';\nimport { ClrFocusDirection } from './enums/focus-direction.enum';\nimport { FocusableItem } from './interfaces';\nimport { ClrKeyFocusItem } from './key-focus-item';\nimport { normalizeKey, preventArrowKeyScroll } from './util';\n\n@Component({\n  selector: '[clrKeyFocus]',\n  template: '<ng-content></ng-content>',\n})\nexport class ClrKeyFocus {\n  @Input('clrDirection') direction: ClrFocusDirection | string = ClrFocusDirection.VERTICAL;\n  @Input('clrFocusOnLoad') focusOnLoad = false;\n\n  @ContentChildren(ClrKeyFocusItem, { descendants: true }) protected clrKeyFocusItems: QueryList<ClrKeyFocusItem>;\n\n  protected subscriptions: Subscription[] = [];\n\n  @Output('clrFocusChange') private focusChange = new EventEmitter<number>();\n\n  private _current = 0;\n  private _focusableItems: Array<FocusableItem>;\n\n  constructor(private elementRef: ElementRef) {}\n\n  /**\n   * Here we use `any` cause any other type require reworking all methods below and a lot of more ifs.\n   * this method will only work with array with FocusableItems anyway so any other value will be ignored.\n   */\n  @Input('clrKeyFocus')\n  get focusableItems() {\n    if (this._focusableItems) {\n      return this._focusableItems;\n    } else if (this.clrKeyFocusItems) {\n      return this.clrKeyFocusItems.toArray();\n    }\n    return [];\n  }\n  set focusableItems(elements: Array<FocusableItem> | any) {\n    // We accept a list of focusable elements (HTMLElements or existing Directives) or auto query for clrKeyFocusItem\n    // We accept a list reference in the cases where we cannot use ContentChildren to query\n    // ContentChildren can be unavailable if content is projected outside the scope of the component (see tabs).\n    if (Array.isArray(elements) && elements.length) {\n      this._focusableItems = elements as Array<FocusableItem>;\n      this.initializeFocus();\n    }\n  }\n\n  get nativeElement(): HTMLElement {\n    return this.elementRef.nativeElement;\n  }\n\n  get current() {\n    return this._current;\n  }\n  set current(value: number) {\n    if (this._current !== value) {\n      this._current = value;\n    }\n  }\n\n  get currentItem() {\n    return this.focusableItems[this._current];\n  }\n\n  get currentItemElement(): HTMLElement {\n    return this.currentItem.nativeElement ? this.currentItem.nativeElement : (this.currentItem as HTMLElement);\n  }\n\n  ngAfterContentInit() {\n    this.subscriptions.push(this.listenForItemUpdates());\n    this.initializeFocus();\n  }\n\n  ngOnDestroy() {\n    this.subscriptions.forEach(s => s.unsubscribe());\n  }\n\n  @HostListener('keydown', ['$event'])\n  handleKeyboardEvent(event: KeyboardEvent) {\n    // Make sure event was originated on the current item's element\n    if (this.currentItemElement !== event.target) {\n      const position = this.getItemPosition(event.target as HTMLElement);\n      if (this.positionInRange(position)) {\n        this.current = position;\n      }\n    }\n\n    if (this.prevKeyPressed(event) && this.currentFocusIsNotFirstItem()) {\n      this.moveTo(this.current - 1);\n    } else if (this.nextKeyPressed(event) && this.currentFocusIsNotLastItem()) {\n      this.moveTo(this.current + 1);\n    } else if (event.code === Keys.Home) {\n      this.moveTo(0);\n    } else if (event.code === Keys.End) {\n      this.moveTo(this.focusableItems.length - 1);\n    }\n\n    preventArrowKeyScroll(event);\n  }\n\n  @HostListener('click', ['$event'])\n  setClickedItemCurrent(event: any) {\n    const position = this.getItemPosition(event.target);\n\n    if (position > -1) {\n      this.moveTo(position);\n    }\n  }\n\n  focusCurrent() {\n    this.currentItem.focus();\n    this.focusChange.next(this._current);\n  }\n\n  moveTo(position: number) {\n    if (this.positionInRange(position)) {\n      this.current = position;\n      this.focusCurrent();\n    }\n  }\n\n  protected positionInRange(position: number) {\n    return position >= 0 && position < this.focusableItems.length;\n  }\n\n  protected currentFocusIsNotFirstItem() {\n    return this._current - 1 >= 0;\n  }\n\n  protected currentFocusIsNotLastItem() {\n    return this._current + 1 < this.focusableItems.length;\n  }\n\n  protected initializeFocus() {\n    if (this.focusableItems && this.focusableItems.length) {\n      // It is possible that the focus was on an element, whose index is no longer available.\n      // This can happen when some of the focusable elements are being removed.\n      // In such cases, the new focus is initialized on the last focusable element.\n      if (this._current >= this.focusableItems.length) {\n        this._current = this.focusableItems.length - 1;\n      }\n\n      if (this.focusOnLoad) {\n        this.currentItem.focus();\n        this.focusChange.next();\n      }\n    }\n  }\n\n  protected nextKeyPressed(event: KeyboardEvent) {\n    const key = normalizeKey(event.key);\n\n    switch (this.direction) {\n      case ClrFocusDirection.VERTICAL:\n        return key === Keys.ArrowDown;\n      case ClrFocusDirection.HORIZONTAL:\n        return key === Keys.ArrowRight;\n      case ClrFocusDirection.BOTH:\n        return key === Keys.ArrowDown || key === Keys.ArrowRight;\n      default:\n        return false;\n    }\n  }\n\n  protected prevKeyPressed(event: KeyboardEvent) {\n    const key = normalizeKey(event.key);\n\n    switch (this.direction) {\n      case ClrFocusDirection.VERTICAL:\n        return key === Keys.ArrowUp;\n      case ClrFocusDirection.HORIZONTAL:\n        return key === Keys.ArrowLeft;\n      case ClrFocusDirection.BOTH:\n        return key === Keys.ArrowUp || key === Keys.ArrowLeft;\n      default:\n        return false;\n    }\n  }\n\n  private getItemPosition(item: HTMLElement) {\n    if (this._focusableItems) {\n      return this.focusableItems.indexOf(item);\n    } else {\n      return this.focusableItems.map(_item => _item.nativeElement).indexOf(item);\n    }\n  }\n\n  private listenForItemUpdates() {\n    return this.clrKeyFocusItems.changes.subscribe(() => {\n      this.initializeFocus();\n    });\n  }\n}\n"]}