@spartacus/storefront
Version:
Spartacus Storefront is a package that you can include in your application, which allows you to add default storefront features.
109 lines • 15.5 kB
JavaScript
import { Injectable } from '@angular/core';
import { AutoFocusService } from '../autofocus/auto-focus.service';
import * as i0 from "@angular/core";
export class TabFocusService extends AutoFocusService {
/**
* Moves to the next (or previous) tab.
*/
moveTab(host, config, increment, event) {
if (config === null || config === void 0 ? void 0 : config.tab) {
const next = config.tab === 'scroll'
? this.findNextScrollable(host, config, increment)
: this.findNext(host, config, increment);
next === null || next === void 0 ? void 0 : next.focus();
event.preventDefault();
event.stopPropagation();
}
}
/**
* builds out virtual slides out of the full scrollable area, to allow
* for maximum flexibility for the underlying layout without using hardcoded
* slide sizes.
*/
findNextScrollable(host, config, increment) {
var _a;
const active = this.getActiveChild(host, config);
if (!active) {
return;
}
// slide count
const virtualSlideCount = Math.round(host.scrollWidth / host.clientWidth);
// find current virtual slide
const currentVirtualSlide = Math.round(active.offsetLeft / (host.scrollWidth / virtualSlideCount));
let nextVirtualSlide = currentVirtualSlide + increment;
if (increment === 1 /* NEXT */ &&
nextVirtualSlide >= virtualSlideCount) {
nextVirtualSlide = 0;
}
if (increment === -1 /* PREV */ && nextVirtualSlide < 0) {
nextVirtualSlide = virtualSlideCount - 1;
}
const firstItemOnNextSlide = (_a = this.getChildren(host, config)) === null || _a === void 0 ? void 0 : _a.find((tab) => tab.offsetLeft >=
(host.scrollWidth / virtualSlideCount) * nextVirtualSlide);
return firstItemOnNextSlide;
}
findNext(host, config, increment) {
const childs = this.getChildren(host, config);
let activeIndex = childs === null || childs === void 0 ? void 0 : childs.findIndex((c) => c === this.getActiveChild(host, config));
if (!activeIndex || activeIndex === -1) {
activeIndex = 0;
}
activeIndex += increment;
if (increment === 1 /* NEXT */ && activeIndex >= (childs === null || childs === void 0 ? void 0 : childs.length)) {
activeIndex = childs.length - 1;
}
if (increment === -1 /* PREV */ && activeIndex < 0) {
activeIndex = 0;
}
return childs ? childs[activeIndex] : undefined;
}
/**
* Returns the active focusable child element. If there's no active
* focusable child element, the first focusable child is returned.
*/
getActiveChild(host, config) {
const persisted = this.getPersisted(host, config === null || config === void 0 ? void 0 : config.group);
if (persisted) {
return persisted;
}
const children = this.getChildren(host, config);
let index = children.findIndex((tab) => this.isActive(tab));
if (!index || index === -1) {
index = 0;
}
return children[index];
}
getChildren(host, config) {
if (typeof config.tab === 'string' && config.tab !== 'scroll') {
return this.selectFocusUtil.query(host, config.tab);
}
else {
return this.findFocusable(host, true);
}
}
/**
* Returns all focusable child elements of the host element.
*
* @param host The host element is used to query child focusable elements.
* @param locked Indicates if locked elements (tabindex=-1) should be returned, defaults to false.
* @param invisible Indicates if invisible child elements should be returned, defaults to false.
*/
findFocusable(host, locked = false, invisible = false) {
return this.selectFocusUtil.findFocusable(host, locked, invisible);
}
isActive(el) {
const child = document.activeElement;
const selector = child.tagName;
return (el === child ||
!!Array.from(el.querySelectorAll(selector)).find((e) => e === child));
}
}
TabFocusService.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.0.5", ngImport: i0, type: TabFocusService, deps: null, target: i0.ɵɵFactoryTarget.Injectable });
TabFocusService.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "12.0.5", ngImport: i0, type: TabFocusService, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.0.5", ngImport: i0, type: TabFocusService, decorators: [{
type: Injectable,
args: [{
providedIn: 'root',
}]
}] });
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this.findNextScrollable(host, config, increment)\n          : this.findNext(host, config, increment);\n\n      next?.focus();\n\n      event.preventDefault();\n      event.stopPropagation();\n    }\n  }\n\n  /**\n   * builds out virtual slides out of the full scrollable area, to allow\n   * for maximum flexibility for the underlying layout without using hardcoded\n   * slide sizes.\n   */\n  protected findNextScrollable(\n    host: HTMLElement,\n    config: TabFocusConfig,\n    increment: MOVE_FOCUS\n  ): HTMLElement {\n    const active = this.getActiveChild(host, config);\n\n    if (!active) {\n      return;\n    }\n    // slide count\n    const virtualSlideCount = Math.round(host.scrollWidth / host.clientWidth);\n\n    // find current virtual slide\n    const currentVirtualSlide = Math.round(\n      active.offsetLeft / (host.scrollWidth / virtualSlideCount)\n    );\n\n    let nextVirtualSlide = currentVirtualSlide + increment;\n    if (\n      increment === MOVE_FOCUS.NEXT &&\n      nextVirtualSlide >= virtualSlideCount\n    ) {\n      nextVirtualSlide = 0;\n    }\n    if (increment === MOVE_FOCUS.PREV && nextVirtualSlide < 0) {\n      nextVirtualSlide = virtualSlideCount - 1;\n    }\n\n    const firstItemOnNextSlide = this.getChildren(host, config)?.find(\n      (tab) =>\n        tab.offsetLeft >=\n        (host.scrollWidth / virtualSlideCount) * nextVirtualSlide\n    );\n\n    return firstItemOnNextSlide;\n  }\n\n  protected findNext(\n    host: HTMLElement,\n    config: TabFocusConfig,\n    increment: MOVE_FOCUS\n  ): HTMLElement {\n    const childs = this.getChildren(host, config);\n    let activeIndex = childs?.findIndex(\n      (c) => c === this.getActiveChild(host, config)\n    );\n\n    if (!activeIndex || activeIndex === -1) {\n      activeIndex = 0;\n    }\n    activeIndex += increment;\n\n    if (increment === MOVE_FOCUS.NEXT && activeIndex >= childs?.length) {\n      activeIndex = childs.length - 1;\n    }\n    if (increment === MOVE_FOCUS.PREV && activeIndex < 0) {\n      activeIndex = 0;\n    }\n    return childs ? childs[activeIndex] : undefined;\n  }\n\n  /**\n   * Returns the active focusable child element. If there's no active\n   * focusable child element, the first focusable child is returned.\n   */\n  protected getActiveChild(\n    host: HTMLElement,\n    config: TabFocusConfig\n  ): HTMLElement {\n    const persisted = this.getPersisted(host, config?.group);\n    if (persisted) {\n      return persisted;\n    }\n    const children = this.getChildren(host, config);\n    let index = children.findIndex((tab) => this.isActive(tab));\n    if (!index || index === -1) {\n      index = 0;\n    }\n    return children[index];\n  }\n\n  protected getChildren(\n    host: HTMLElement,\n    config: TabFocusConfig\n  ): HTMLElement[] {\n    if (typeof config.tab === 'string' && config.tab !== 'scroll') {\n      return this.selectFocusUtil.query(host, config.tab);\n    } else {\n      return this.findFocusable(host, true);\n    }\n  }\n\n  /**\n   * Returns all focusable child elements of the host element.\n   *\n   * @param host The host element is used to query child focusable elements.\n   * @param locked Indicates if locked elements (tabindex=-1) should be returned, defaults to false.\n   * @param invisible Indicates if invisible child elements should be returned, defaults to false.\n   */\n  findFocusable(\n    host: HTMLElement,\n    locked = false,\n    invisible = false\n  ): HTMLElement[] {\n    return this.selectFocusUtil.findFocusable(host, locked, invisible);\n  }\n\n  protected isActive(el: HTMLElement): boolean {\n    const child = document.activeElement;\n    const selector = child.tagName;\n\n    return (\n      el === child ||\n      !!Array.from(el.querySelectorAll(selector)).find((e) => e === child)\n    );\n  }\n}\n"]}