@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
131 lines • 21.1 kB
JavaScript
import { ContentChildren, Directive, ElementRef, inject, Input, QueryList } from '@angular/core';
import { Subject } from 'rxjs';
import { filter, takeUntil } from 'rxjs/operators';
import { TabbableListItemDirective } from './tabbable-list-item.directive';
import { TabbableListService } from './tabbable-list.service';
import * as i0 from "@angular/core";
export class TabbableListDirective {
/** Enabling handling of hierarchical lists via use of the `TabbableListItemDirective.parent` property. */
set hierarchy(value) { this._tabbableList.hierarchy = value; }
/** Prevent keyboard interaction when alt modifier key is pressed */
set allowAltModifier(value) { this._tabbableList.allowAltModifier = value; }
/** Prevent keyboard interaction when ctrl modifier key is pressed */
set allowCtrlModifier(value) { this._tabbableList.allowCtrlModifier = value; }
/** Focus the first or last item when Home or End keys are pressed */
set allowBoundaryKeys(value) { this._tabbableList.allowBoundaryKeys = value; }
get focusKeyManager() {
return this._tabbableList.focusKeyManager;
}
constructor() {
/** Access the tabbable list service */
this._tabbableList = inject(TabbableListService);
/** Access the native dom element */
this.elementRef = inject(ElementRef);
/** Determine whether the up/down arrows should be used or the left/right arrows */
this.direction = 'vertical';
/** Indicate whether or not focus should loop back to the first element after the last */
this.wrap = true;
/** Indicate whether or not the first item should receive focus on show - useful for modals and popovers */
this.focusOnShow = false;
/** Indicate whether or not focus should be returned to the previous element (only applicable when using focusOnShow) */
this.returnFocus = false;
/** Unsubscribe from all observables automatically on destroy */
this._onDestroy = new Subject();
// store a reference to the container element
this._tabbableList.containerRef = this.elementRef.nativeElement;
}
ngAfterContentInit() {
// store the currently focused element
this._focusedElement = document.activeElement;
this._orderedItems = new QueryList();
if (this._tabbableList.hierarchy) {
// Sort items in a hierarchy
this._orderedItems.reset(this._tabbableList.sortItemsByHierarchy(this.items));
// Ensure that the child items remain sorted
this.items.changes.pipe(takeUntil(this._onDestroy)).subscribe(() => {
this._orderedItems.reset(this._tabbableList.sortItemsByHierarchy(this.items));
this._orderedItems.notifyOnChanges();
});
}
else {
// Items are already in order
this._orderedItems = this.items;
// Ensure we reselect a selected item after the querylist has changed
this.items.changes.pipe(filter(() => this._tabbableList.shouldFocusOnChange && this._tabbableList.isFocused), takeUntil(this._onDestroy))
.subscribe((items) => {
// check if an item is currently focused
const activeItem = this._tabbableList.focusKeyManager.activeItem;
// restore the selected item if there was one and it is still visible
if (activeItem) {
// find the matching index
const index = items.toArray().findIndex(item => item.key === activeItem.key);
// if the item is still in the list we want to focus it
if (index > -1) {
// however we are refocusing an item that was focused so we dont want to scroll into view again as this can prevent wheel scrolling
this._tabbableList.shouldScrollInView = false;
// refocus the item again
this._tabbableList.activateItemAtIndex(index, !this._tabbableList.isFocused);
// re-enable scrolling into view
this._tabbableList.shouldScrollInView = true;
}
}
});
}
// Set up the focus monitoring
this._tabbableList.initialize(this._orderedItems, this.direction, this.wrap);
// focus the first element if specified
if (this.focusOnShow) {
this._tabbableList.focusKeyManager.setFirstItemActive();
}
}
ngOnDestroy() {
if (this.returnFocus && this._focusedElement instanceof HTMLElement) {
setTimeout(() => this._focusedElement.focus());
}
this._onDestroy.next();
this._onDestroy.complete();
}
setFirstItemTabbable() {
if (!this._tabbableList.isAnyItemTabbable()) {
this._tabbableList.setFirstItemTabbable();
}
}
focus() {
if (this._tabbableList.focusKeyManager && this._tabbableList.focusKeyManager.activeItem) {
this._tabbableList.focusKeyManager.activeItem.focus();
}
}
focusTabbableItem() {
this._tabbableList.focusTabbableItem();
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: TabbableListDirective, deps: [], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.2.12", type: TabbableListDirective, selector: "[uxTabbableList]", inputs: { direction: "direction", wrap: "wrap", focusOnShow: "focusOnShow", returnFocus: "returnFocus", hierarchy: "hierarchy", allowAltModifier: "allowAltModifier", allowCtrlModifier: "allowCtrlModifier", allowBoundaryKeys: "allowBoundaryKeys" }, providers: [TabbableListService], queries: [{ propertyName: "items", predicate: TabbableListItemDirective, descendants: true }], exportAs: ["ux-tabbable-list"], ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: TabbableListDirective, decorators: [{
type: Directive,
args: [{
selector: '[uxTabbableList]',
exportAs: 'ux-tabbable-list',
providers: [TabbableListService]
}]
}], ctorParameters: () => [], propDecorators: { direction: [{
type: Input
}], wrap: [{
type: Input
}], focusOnShow: [{
type: Input
}], returnFocus: [{
type: Input
}], hierarchy: [{
type: Input
}], allowAltModifier: [{
type: Input
}], allowCtrlModifier: [{
type: Input
}], allowBoundaryKeys: [{
type: Input
}], items: [{
type: ContentChildren,
args: [TabbableListItemDirective, { descendants: true }]
}] } });
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{ FocusKeyManager } from '@angular/cdk/a11y';\nimport { AfterContentInit, ContentChildren, Directive, ElementRef, inject, Input, OnDestroy, QueryList } from '@angular/core';\nimport { Subject } from 'rxjs';\nimport { filter, takeUntil } from 'rxjs/operators';\nimport { TabbableListItemDirective } from './tabbable-list-item.directive';\nimport { TabbableListService } from './tabbable-list.service';\n\n@Directive({\n    selector: '[uxTabbableList]',\n    exportAs: 'ux-tabbable-list',\n    providers: [TabbableListService]\n})\nexport class TabbableListDirective implements AfterContentInit, OnDestroy {\n    /** Access the tabbable list service */\n    private readonly _tabbableList = inject(TabbableListService);\n    /** Access the native dom element */\n    readonly elementRef = inject(ElementRef);\n\n    /** Determine whether the up/down arrows should be used or the left/right arrows */\n    @Input() direction: 'horizontal' | 'vertical' = 'vertical';\n\n    /** Indicate whether or not focus should loop back to the first element after the last */\n    @Input() wrap: boolean = true;\n\n    /** Indicate whether or not the first item should receive focus on show - useful for modals and popovers */\n    @Input() focusOnShow: boolean = false;\n\n    /** Indicate whether or not focus should be returned to the previous element (only applicable when using focusOnShow) */\n    @Input() returnFocus: boolean = false;\n\n    /** Enabling handling of hierarchical lists via use of the `TabbableListItemDirective.parent` property. */\n    @Input() set hierarchy(value: boolean) { this._tabbableList.hierarchy = value; }\n\n    /** Prevent keyboard interaction when alt modifier key is pressed */\n    @Input() set allowAltModifier(value: boolean) { this._tabbableList.allowAltModifier = value; }\n\n    /** Prevent keyboard interaction when ctrl modifier key is pressed */\n    @Input() set allowCtrlModifier(value: boolean) { this._tabbableList.allowCtrlModifier = value; }\n\n    /** Focus the first or last item when Home or End keys are pressed */\n    @Input() set allowBoundaryKeys(value: boolean) { this._tabbableList.allowBoundaryKeys = value; }\n\n    /** Find all tabbable list items */\n    @ContentChildren(TabbableListItemDirective, { descendants: true }) items: QueryList<TabbableListItemDirective>;\n\n    /** Store the currently focused HTML element */\n    private _focusedElement: HTMLElement;\n\n    /** Store the items in a specific order */\n    private _orderedItems: QueryList<TabbableListItemDirective>;\n\n    /** Unsubscribe from all observables automatically on destroy */\n    private readonly _onDestroy = new Subject<void>();\n\n    get focusKeyManager(): FocusKeyManager<TabbableListItemDirective> {\n        return this._tabbableList.focusKeyManager;\n    }\n\n    constructor() {\n        // store a reference to the container element\n        this._tabbableList.containerRef = this.elementRef.nativeElement;\n    }\n\n    ngAfterContentInit(): void {\n\n        // store the currently focused element\n        this._focusedElement = document.activeElement as HTMLElement;\n        this._orderedItems = new QueryList<TabbableListItemDirective>();\n\n        if (this._tabbableList.hierarchy) {\n\n            // Sort items in a hierarchy\n            this._orderedItems.reset(this._tabbableList.sortItemsByHierarchy(this.items));\n\n            // Ensure that the child items remain sorted\n            this.items.changes.pipe(takeUntil(this._onDestroy)).subscribe(() => {\n                this._orderedItems.reset(this._tabbableList.sortItemsByHierarchy(this.items));\n                this._orderedItems.notifyOnChanges();\n            });\n\n        } else {\n\n            // Items are already in order\n            this._orderedItems = this.items;\n\n            // Ensure we reselect a selected item after the querylist has changed\n            this.items.changes.pipe(filter(() => this._tabbableList.shouldFocusOnChange && this._tabbableList.isFocused), takeUntil(this._onDestroy))\n                .subscribe((items: QueryList<TabbableListItemDirective>) => {\n\n                    // check if an item is currently focused\n                    const activeItem = this._tabbableList.focusKeyManager.activeItem;\n\n                    // restore the selected item if there was one and it is still visible\n                    if (activeItem) {\n\n                        // find the matching index\n                        const index = items.toArray().findIndex(item => item.key === activeItem.key);\n\n                        // if the item is still in the list we want to focus it\n                        if (index > -1) {\n\n                            // however we are refocusing an item that was focused so we dont want to scroll into view again as this can prevent wheel scrolling\n                            this._tabbableList.shouldScrollInView = false;\n\n                            // refocus the item again\n                            this._tabbableList.activateItemAtIndex(index, !this._tabbableList.isFocused);\n\n                            // re-enable scrolling into view\n                            this._tabbableList.shouldScrollInView = true;\n                        }\n                    }\n                });\n        }\n\n        // Set up the focus monitoring\n        this._tabbableList.initialize(this._orderedItems, this.direction, this.wrap);\n\n        // focus the first element if specified\n        if (this.focusOnShow) {\n            this._tabbableList.focusKeyManager.setFirstItemActive();\n        }\n    }\n\n    ngOnDestroy(): void {\n        if (this.returnFocus && this._focusedElement instanceof HTMLElement) {\n            setTimeout(() => this._focusedElement.focus());\n        }\n\n        this._onDestroy.next();\n        this._onDestroy.complete();\n    }\n\n    setFirstItemTabbable(): void {\n        if (!this._tabbableList.isAnyItemTabbable()) {\n            this._tabbableList.setFirstItemTabbable();\n        }\n    }\n\n    focus(): void {\n        if (this._tabbableList.focusKeyManager && this._tabbableList.focusKeyManager.activeItem) {\n            this._tabbableList.focusKeyManager.activeItem.focus();\n        }\n    }\n\n    focusTabbableItem(): void {\n        this._tabbableList.focusTabbableItem();\n    }\n}\n"]}