@clr/angular
Version:
Angular components for Clarity
94 lines • 13.1 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 { Injectable, Optional, Renderer2, SkipSelf } from '@angular/core';
import { isObservable, of } from 'rxjs';
import { ArrowKeyDirection } from './arrow-key-direction.enum';
import * as i0 from "@angular/core";
export class FocusService {
constructor(renderer) {
this.renderer = renderer;
this._unlistenFuncs = [];
}
get current() {
return this._current;
}
reset(first) {
this._current = first;
}
listenToArrowKeys(el) {
// The following listeners return false when there was an action to take for the key pressed,
// in order to prevent the default behavior of that key.
this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.arrowup', () => !this.move(ArrowKeyDirection.UP)));
this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.arrowdown', () => !this.move(ArrowKeyDirection.DOWN)));
this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.arrowleft', () => !this.move(ArrowKeyDirection.LEFT)));
this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.arrowright', () => !this.move(ArrowKeyDirection.RIGHT)));
}
registerContainer(el, tabIndex = '0') {
this.renderer.setAttribute(el, 'tabindex', tabIndex);
this.listenToArrowKeys(el);
// The following listeners return false when there was an action to take for the key pressed,
// in order to prevent the default behavior of that key.
this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.space', () => !this.activateCurrent()));
this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.enter', () => !this.activateCurrent()));
}
moveTo(item) {
/**
* Make sure that item is not undefined,
* This is safety net in the case that someone sometime decide to
* call this method without having FocusableItem.
*/
if (item === undefined) {
return;
}
if (this.current) {
this.current.blur();
}
item.focus();
this._current = item;
}
move(direction) {
let moved = false;
if (this.current) {
const next = this.current[direction];
if (next) {
// Turning the value into an Observable isn't great, but it's the fastest way to avoid code duplication.
// If performance ever matters for this, we can refactor using additional private methods.
const nextObs = isObservable(next) ? next : of(next);
nextObs.subscribe(item => {
if (item) {
this.moveTo(item);
moved = true;
}
});
}
}
return moved;
}
activateCurrent() {
if (this.current && this.current.activate) {
this.current.activate();
return true;
}
return false;
}
detachListeners() {
this._unlistenFuncs.forEach(unlisten => unlisten());
}
}
FocusService.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: FocusService, deps: [{ token: i0.Renderer2 }], target: i0.ɵɵFactoryTarget.Injectable });
FocusService.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: FocusService });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: FocusService, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: i0.Renderer2 }]; } });
export function clrFocusServiceFactory(existing, renderer) {
return existing || new FocusService(renderer);
}
export const FOCUS_SERVICE_PROVIDER = {
provide: FocusService,
useFactory: clrFocusServiceFactory,
deps: [[new Optional(), new SkipSelf(), FocusService], Renderer2],
};
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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 { Injectable, Optional, Renderer2, SkipSelf } from '@angular/core';\nimport { isObservable, of } from 'rxjs';\n\nimport { ArrowKeyDirection } from './arrow-key-direction.enum';\nimport { FocusableItem } from './focusable-item/focusable-item';\n\n@Injectable()\nexport class FocusService {\n  private _current: FocusableItem;\n  private _unlistenFuncs: (() => void)[] = [];\n\n  constructor(private renderer: Renderer2) {}\n\n  get current() {\n    return this._current;\n  }\n\n  reset(first: FocusableItem) {\n    this._current = first;\n  }\n\n  listenToArrowKeys(el: HTMLElement) {\n    // The following listeners return false when there was an action to take for the key pressed,\n    // in order to prevent the default behavior of that key.\n    this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.arrowup', () => !this.move(ArrowKeyDirection.UP)));\n    this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.arrowdown', () => !this.move(ArrowKeyDirection.DOWN)));\n    this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.arrowleft', () => !this.move(ArrowKeyDirection.LEFT)));\n    this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.arrowright', () => !this.move(ArrowKeyDirection.RIGHT)));\n  }\n\n  registerContainer(el: HTMLElement, tabIndex = '0') {\n    this.renderer.setAttribute(el, 'tabindex', tabIndex);\n    this.listenToArrowKeys(el);\n    // The following listeners return false when there was an action to take for the key pressed,\n    // in order to prevent the default behavior of that key.\n    this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.space', () => !this.activateCurrent()));\n    this._unlistenFuncs.push(this.renderer.listen(el, 'keydown.enter', () => !this.activateCurrent()));\n  }\n\n  moveTo(item: FocusableItem) {\n    /**\n     * Make sure that item is not undefined,\n     * This is safety net in the case that someone sometime decide to\n     * call this method without having FocusableItem.\n     */\n    if (item === undefined) {\n      return;\n    }\n\n    if (this.current) {\n      this.current.blur();\n    }\n    item.focus();\n    this._current = item;\n  }\n\n  move(direction: ArrowKeyDirection): boolean {\n    let moved = false;\n    if (this.current) {\n      const next = this.current[direction];\n      if (next) {\n        // Turning the value into an Observable isn't great, but it's the fastest way to avoid code duplication.\n        // If performance ever matters for this, we can refactor using additional private methods.\n        const nextObs = isObservable(next) ? next : of(next);\n        nextObs.subscribe(item => {\n          if (item) {\n            this.moveTo(item);\n            moved = true;\n          }\n        });\n      }\n    }\n    return moved;\n  }\n\n  activateCurrent() {\n    if (this.current && this.current.activate) {\n      this.current.activate();\n      return true;\n    }\n    return false;\n  }\n\n  detachListeners() {\n    this._unlistenFuncs.forEach(unlisten => unlisten());\n  }\n}\n\nexport function clrFocusServiceFactory(existing: FocusService, renderer: Renderer2) {\n  return existing || new FocusService(renderer);\n}\n\nexport const FOCUS_SERVICE_PROVIDER = {\n  provide: FocusService,\n  useFactory: clrFocusServiceFactory,\n  deps: [[new Optional(), new SkipSelf(), FocusService], Renderer2],\n};\n"]}