@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
150 lines • 21.4 kB
JavaScript
import { inject, Injectable, RendererFactory2 } from '@angular/core';
import { BehaviorSubject } from 'rxjs';
import * as i0 from "@angular/core";
export class ManagedFocusContainerService {
constructor() {
this.rendererFactory = inject(RendererFactory2);
this._containers = [];
// programmatically create a renderer as it can't be injected into a service
this._renderer = this.rendererFactory.createRenderer(null, null);
}
/**
* Create or get an existing object which manages the tabindex of descendants.
* @param element The element containing focusable descendants.
* @param component The component requesting the managed focus container.
*/
register(element, component) {
// Only create a new instance if no other component has created a container on the same element
let containerRef = this._containers.find(ref => ref.container.element.isEqualNode(element));
if (!containerRef) {
containerRef = new ManagedFocusContainerWithReferences(new ManagedFocusContainer(element, this._renderer));
this._containers.push(containerRef);
// Start listening for focus
containerRef.container.register();
}
// Track references to dispose correctly
if (component) {
containerRef.addReference(component);
}
}
/**
* Remove the container object. This will call `unregister` on the container if `component` is the last reference
* to it.
* @param element The element containing focusable descendants.
* @param component The component requesting the managed focus container.
*/
unregister(element, component) {
// Remove the container's reference to the source component
const containerRef = this._containers.find(ref => ref.container.element.isEqualNode(element));
// technically this function can be called before the register function if ngOnDestroy runs before it
// is fully initialized so we should stop here if there is no containRef.
if (!containerRef) {
return;
}
containerRef.removeReference(component);
if (!containerRef.isAlive()) {
// Last reference was removed, so unregister the listeners
containerRef.container.unregister();
// Clean up the reference tracking array
this._containers = this._containers.filter(c => c !== containerRef);
}
}
/**
* Get an observable which can be used to determine when the element or one of its descendants has focus.
* @param element The element containing focusable descendants.
*/
hasFocus(element) {
const container = this.getContainer(element);
return container ? container.hasFocus$.asObservable() : null;
}
getContainer(element) {
const containerRef = this._containers.find(ref => ref.container.element.isEqualNode(element));
return containerRef ? containerRef.container : null;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: ManagedFocusContainerService, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: ManagedFocusContainerService }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: ManagedFocusContainerService, decorators: [{
type: Injectable
}], ctorParameters: () => [] });
class ManagedFocusContainer {
constructor(element, _renderer) {
this.element = element;
this._renderer = _renderer;
/** Whether the container or one of its descendants has focus. */
this.hasFocus$ = new BehaviorSubject(false);
this._modifiedElements = [];
this._unlisten = [];
}
/** Start managing the focus of child elements. */
register() {
this._unlisten.push(this._renderer.listen(this.element, 'focusin', this.onFocusIn.bind(this)));
this._unlisten.push(this._renderer.listen(this.element, 'focusout', this.onFocusOut.bind(this)));
// Check if the container already has focus
setTimeout(() => {
if (!this.element.contains(document.activeElement)) {
this.removeTabFocus();
}
});
}
/** Stop managing the focus of child elements. */
unregister() {
// Dispose the event handlers
this._unlisten.forEach(unlisten => unlisten());
this._unlisten = [];
// Undo any tabindex modifications
this.restoreTabFocus();
}
onFocusIn() {
this.restoreTabFocus();
}
onFocusOut() {
this.removeTabFocus();
}
removeTabFocus() {
this.hasFocus$.next(false);
// Clear the list of affected elements
this._modifiedElements = [];
// Get all focusable children
const focusable = this.element.querySelectorAll('button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])');
// Remove focusable children from the tab ring
Array.from(focusable).forEach(element => {
const originalTabIndex = element.getAttribute('tabindex');
this._renderer.setAttribute(element, 'tabindex', '-1');
this._modifiedElements.push({
element,
tabindex: originalTabIndex
});
});
}
restoreTabFocus() {
this.hasFocus$.next(true);
// Restore tab focus ability by removing the custom `tabindex` attribute
this._modifiedElements.forEach(elementInfo => {
if (elementInfo.tabindex === null) {
this._renderer.removeAttribute(elementInfo.element, 'tabindex');
}
else {
this._renderer.setAttribute(elementInfo.element, 'tabindex', elementInfo.tabindex);
}
});
// Clear the list of affected elements
this._modifiedElements = [];
}
}
class ManagedFocusContainerWithReferences {
constructor(container) {
this.container = container;
this._components = [];
}
addReference(component) {
this._components.push(component);
}
removeReference(component) {
this._components = this._components.filter(c => c !== component);
}
isAlive() {
return this._components.length > 0;
}
}
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{ inject, Injectable, Renderer2, RendererFactory2 } from '@angular/core';\nimport { BehaviorSubject, Observable } from 'rxjs';\n\n@Injectable()\nexport class ManagedFocusContainerService {\n    readonly rendererFactory = inject(RendererFactory2);\n\n    private _containers: ManagedFocusContainerWithReferences[] = [];\n    private readonly _renderer: Renderer2;\n\n    constructor() {\n        // programmatically create a renderer as it can't be injected into a service\n        this._renderer = this.rendererFactory.createRenderer(null, null);\n    }\n\n    /**\n     * Create or get an existing object which manages the tabindex of descendants.\n     * @param element The element containing focusable descendants.\n     * @param component The component requesting the managed focus container.\n     */\n    register(element: HTMLElement, component: unknown): void {\n\n        // Only create a new instance if no other component has created a container on the same element\n        let containerRef = this._containers.find(ref => ref.container.element.isEqualNode(element));\n        if (!containerRef) {\n            containerRef = new ManagedFocusContainerWithReferences(new ManagedFocusContainer(element, this._renderer));\n            this._containers.push(containerRef);\n\n            // Start listening for focus\n            containerRef.container.register();\n        }\n\n        // Track references to dispose correctly\n        if (component) {\n            containerRef.addReference(component);\n        }\n    }\n\n    /**\n     * Remove the container object. This will call `unregister` on the container if `component` is the last reference\n     * to it.\n     * @param element The element containing focusable descendants.\n     * @param component The component requesting the managed focus container.\n     */\n    unregister(element: HTMLElement, component: unknown): void {\n\n        // Remove the container's reference to the source component\n        const containerRef = this._containers.find(ref => ref.container.element.isEqualNode(element));\n\n        // technically this function can be called before the register function if ngOnDestroy runs before it\n        // is fully initialized so we should stop here if there is no containRef.\n        if (!containerRef) {\n            return;\n        }\n\n        containerRef.removeReference(component);\n\n        if (!containerRef.isAlive()) {\n\n            // Last reference was removed, so unregister the listeners\n            containerRef.container.unregister();\n\n            // Clean up the reference tracking array\n            this._containers = this._containers.filter(c => c !== containerRef);\n        }\n    }\n\n    /**\n     * Get an observable which can be used to determine when the element or one of its descendants has focus.\n     * @param element The element containing focusable descendants.\n     */\n    hasFocus(element: HTMLElement): Observable<boolean> {\n        const container = this.getContainer(element);\n        return container ? container.hasFocus$.asObservable() : null;\n    }\n\n    private getContainer(element: HTMLElement): ManagedFocusContainer {\n        const containerRef = this._containers.find(ref => ref.container.element.isEqualNode(element));\n        return containerRef ? containerRef.container : null;\n    }\n}\n\nclass ManagedFocusContainer {\n\n    /** Whether the container or one of its descendants has focus. */\n    readonly hasFocus$ = new BehaviorSubject<boolean>(false);\n\n    private _modifiedElements: ManagedFocusElementInfo[] = [];\n    private _unlisten: (() => void)[] = [];\n\n    constructor(\n        public readonly element: HTMLElement,\n        private readonly _renderer: Renderer2\n    ) { }\n\n    /** Start managing the focus of child elements. */\n    register(): void {\n\n        this._unlisten.push(this._renderer.listen(this.element, 'focusin', this.onFocusIn.bind(this)));\n        this._unlisten.push(this._renderer.listen(this.element, 'focusout', this.onFocusOut.bind(this)));\n\n        // Check if the container already has focus\n        setTimeout(() => {\n            if (!this.element.contains(document.activeElement)) {\n                this.removeTabFocus();\n            }\n        });\n    }\n\n    /** Stop managing the focus of child elements. */\n    unregister(): void {\n\n        // Dispose the event handlers\n        this._unlisten.forEach(unlisten => unlisten());\n        this._unlisten = [];\n\n        // Undo any tabindex modifications\n        this.restoreTabFocus();\n    }\n\n    private onFocusIn(): void {\n        this.restoreTabFocus();\n    }\n\n    private onFocusOut(): void {\n        this.removeTabFocus();\n    }\n\n    private removeTabFocus(): void {\n\n        this.hasFocus$.next(false);\n\n        // Clear the list of affected elements\n        this._modifiedElements = [];\n\n        // Get all focusable children\n        const focusable = this.element.querySelectorAll(\n            'button, [href], input, select, textarea, [tabindex]:not([tabindex=\"-1\"])'\n        );\n\n        // Remove focusable children from the tab ring\n        Array.from(focusable).forEach(element => {\n            const originalTabIndex = element.getAttribute('tabindex');\n            this._renderer.setAttribute(element, 'tabindex', '-1');\n            this._modifiedElements.push({\n                element,\n                tabindex: originalTabIndex\n            });\n        });\n    }\n\n    private restoreTabFocus(): void {\n\n        this.hasFocus$.next(true);\n\n        // Restore tab focus ability by removing the custom `tabindex` attribute\n        this._modifiedElements.forEach(elementInfo => {\n            if (elementInfo.tabindex === null) {\n                this._renderer.removeAttribute(elementInfo.element, 'tabindex');\n            } else {\n                this._renderer.setAttribute(elementInfo.element, 'tabindex', elementInfo.tabindex);\n            }\n        });\n\n        // Clear the list of affected elements\n        this._modifiedElements = [];\n    }\n}\n\ninterface ManagedFocusElementInfo {\n    element: Element;\n    tabindex: string;\n}\n\nclass ManagedFocusContainerWithReferences {\n\n    private _components: unknown[] = [];\n\n    constructor(public container: ManagedFocusContainer) { }\n\n    addReference(component: unknown): void {\n        this._components.push(component);\n    }\n\n    removeReference(component: unknown): void {\n        this._components = this._components.filter(c => c !== component);\n    }\n\n    isAlive(): boolean {\n        return this._components.length > 0;\n    }\n}"]}