@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
170 lines • 20.5 kB
JavaScript
import { DOWN_ARROW, END, ESCAPE, HOME, LEFT_ARROW, RIGHT_ARROW, UP_ARROW } from '@angular/cdk/keycodes';
import { Directive, EventEmitter, HostListener, inject, Input, Output } from '@angular/core';
import { Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { MenuNavigationService } from './menu-navigation.service';
import * as i0 from "@angular/core";
export class MenuNavigationDirective {
constructor() {
this._menuNavigationService = inject(MenuNavigationService);
/** Define the position of the toggle button relative to the menu */
this.toggleButtonPosition = 'top';
/** Emit when the menu is no longer focused */
this.navigatedOut = new EventEmitter();
/** Determine if the menu currently has focus */
this._isFocused = false;
/** Unsubscribe from all observables on destroy */
this._onDestroy = new Subject();
}
/** Get the index of the currently active item */
get activeIndex() {
return this.menuItems.indexOf(this._menuNavigationService.active$.value);
}
// get the list of menu items
get menuItems() {
return this._menuNavigationService.menuItems;
}
ngOnInit() {
if (this.toggleButton) {
this.toggleButton.keyEnter.pipe(takeUntil(this._onDestroy))
.subscribe(() => this.focusFirst());
}
}
ngOnDestroy() {
this._onDestroy.next();
this._onDestroy.complete();
}
focusFirst() {
this.moveFirst();
}
onFocusIn() {
this._isFocused = true;
}
onFocusOut() {
this._isFocused = false;
}
keydownHandler(event) {
// Only handle events when focus in within the list of menu items
if (this._isFocused === false) {
return;
}
let handled = false;
switch (event.which) {
case UP_ARROW:
this.movePrevious(event);
handled = true;
break;
case DOWN_ARROW:
this.moveNext(event);
handled = true;
break;
case LEFT_ARROW:
if (this.toggleButtonPosition === 'left') {
this.moveToToggleButton(event);
handled = true;
}
break;
case RIGHT_ARROW:
if (this.toggleButtonPosition === 'right') {
this.moveToToggleButton(event);
handled = true;
}
break;
case HOME:
this.moveFirst();
handled = true;
break;
case END:
this.moveLast();
handled = true;
break;
case ESCAPE:
this.moveToToggleButton(event);
handled = true;
break;
}
if (handled) {
event.preventDefault();
event.stopPropagation();
}
}
moveNext(event) {
// Do nothing if there's no active menu item registered
if (this.activeIndex < 0) {
return;
}
const nextIndex = this.activeIndex + 1;
if (nextIndex < this.menuItems.length) {
// Activate the next menu item
// (uxMenuNavigationItem subscribes to this and applies focus if it matches)
this._menuNavigationService.active$.next(this.menuItems[nextIndex]);
}
else {
// Check if focus went out of bounds in the direction of the origin toggle button
if (this.toggleButtonPosition === 'bottom') {
this.moveToToggleButton(event);
}
}
}
movePrevious(event) {
// Do nothing if there's no active menu item registered
if (this.activeIndex < 0) {
return;
}
const nextIndex = this.activeIndex - 1;
if (nextIndex >= 0) {
// Activate the previous menu item
// (uxMenuNavigationItem subscribes to this and applies focus if it matches)
this._menuNavigationService.active$.next(this.menuItems[nextIndex]);
}
else {
// Check if focus went out of bounds in the direction of the origin toggle button
if (this.toggleButtonPosition === 'top') {
this.moveToToggleButton(event);
}
}
}
moveFirst() {
if (this.menuItems.length > 0) {
this._menuNavigationService.active$.next(this.menuItems[0]);
}
}
moveLast() {
if (this.menuItems.length > 0) {
this._menuNavigationService.active$.next(this.menuItems[this.menuItems.length - 1]);
}
}
moveToToggleButton(event) {
if (this.toggleButton) {
this.toggleButton.focus('keyboard');
this.toggleButton.menuOpen = false;
}
this.navigatedOut.emit(event);
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: MenuNavigationDirective, deps: [], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.2.12", type: MenuNavigationDirective, selector: "[uxMenuNavigation]", inputs: { toggleButton: "toggleButton", toggleButtonPosition: "toggleButtonPosition" }, outputs: { navigatedOut: "navigatedOut" }, host: { listeners: { "focusin": "onFocusIn()", "focusout": "onFocusOut()", "keydown": "keydownHandler($event)" } }, providers: [MenuNavigationService], exportAs: ["uxMenuNavigation"], ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: MenuNavigationDirective, decorators: [{
type: Directive,
args: [{
selector: '[uxMenuNavigation]',
exportAs: 'uxMenuNavigation',
providers: [MenuNavigationService]
}]
}], propDecorators: { toggleButton: [{
type: Input
}], toggleButtonPosition: [{
type: Input
}], navigatedOut: [{
type: Output
}], onFocusIn: [{
type: HostListener,
args: ['focusin']
}], onFocusOut: [{
type: HostListener,
args: ['focusout']
}], keydownHandler: [{
type: HostListener,
args: ['keydown', ['$event']]
}] } });
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{ DOWN_ARROW, END, ESCAPE, HOME, LEFT_ARROW, RIGHT_ARROW, UP_ARROW } from '@angular/cdk/keycodes';\nimport { Directive, EventEmitter, HostListener, inject, Input, OnDestroy, OnInit, Output } from '@angular/core';\nimport { Subject } from 'rxjs';\nimport { takeUntil } from 'rxjs/operators';\nimport { MenuNavigationItemDirective } from './menu-navigation-item.directive';\nimport { MenuNavigationToggleDirective } from './menu-navigation-toggle.directive';\nimport { MenuNavigationService } from './menu-navigation.service';\n\n@Directive({\n    selector: '[uxMenuNavigation]',\n    exportAs: 'uxMenuNavigation',\n    providers: [MenuNavigationService]\n})\nexport class MenuNavigationDirective implements OnInit, OnDestroy {\n    private readonly _menuNavigationService = inject(MenuNavigationService);\n\n    /** Define the menu toggle button */\n    @Input() toggleButton: MenuNavigationToggleDirective;\n\n    /** Define the position of the toggle button relative to the menu */\n    @Input() toggleButtonPosition: 'top' | 'right' | 'bottom' | 'left' = 'top';\n\n    /** Emit when the menu is no longer focused */\n    @Output() navigatedOut = new EventEmitter<KeyboardEvent>();\n\n    /** Get the index of the currently active item */\n    get activeIndex(): number {\n        return this.menuItems.indexOf(this._menuNavigationService.active$.value);\n    }\n\n    // get the list of menu items\n    get menuItems(): ReadonlyArray<MenuNavigationItemDirective> {\n        return this._menuNavigationService.menuItems;\n    }\n\n    /** Determine if the menu currently has focus */\n    private _isFocused: boolean = false;\n\n    /** Unsubscribe from all observables on destroy */\n    private readonly _onDestroy = new Subject<void>();\n\n    ngOnInit(): void {\n        if (this.toggleButton) {\n            this.toggleButton.keyEnter.pipe(takeUntil(this._onDestroy))\n                .subscribe(() => this.focusFirst());\n        }\n    }\n\n    ngOnDestroy(): void {\n        this._onDestroy.next();\n        this._onDestroy.complete();\n    }\n\n    focusFirst(): void {\n        this.moveFirst();\n    }\n\n    @HostListener('focusin')\n    onFocusIn(): void {\n        this._isFocused = true;\n    }\n\n    @HostListener('focusout')\n    onFocusOut(): void {\n        this._isFocused = false;\n    }\n\n    @HostListener('keydown', ['$event'])\n    keydownHandler(event: KeyboardEvent): void {\n\n        // Only handle events when focus in within the list of menu items\n        if (this._isFocused === false) {\n            return;\n        }\n\n        let handled = false;\n\n        switch (event.which) {\n\n            case UP_ARROW:\n                this.movePrevious(event);\n                handled = true;\n                break;\n\n            case DOWN_ARROW:\n                this.moveNext(event);\n                handled = true;\n                break;\n\n            case LEFT_ARROW:\n                if (this.toggleButtonPosition === 'left') {\n                    this.moveToToggleButton(event);\n                    handled = true;\n                }\n                break;\n\n            case RIGHT_ARROW:\n                if (this.toggleButtonPosition === 'right') {\n                    this.moveToToggleButton(event);\n                    handled = true;\n                }\n                break;\n\n            case HOME:\n                this.moveFirst();\n                handled = true;\n                break;\n\n            case END:\n                this.moveLast();\n                handled = true;\n                break;\n\n            case ESCAPE:\n                this.moveToToggleButton(event);\n                handled = true;\n                break;\n        }\n\n        if (handled) {\n            event.preventDefault();\n            event.stopPropagation();\n        }\n    }\n\n    private moveNext(event: KeyboardEvent): void {\n\n        // Do nothing if there's no active menu item registered\n        if (this.activeIndex < 0) {\n            return;\n        }\n\n        const nextIndex = this.activeIndex + 1;\n        if (nextIndex < this.menuItems.length) {\n\n            // Activate the next menu item\n            // (uxMenuNavigationItem subscribes to this and applies focus if it matches)\n            this._menuNavigationService.active$.next(this.menuItems[nextIndex]);\n\n        } else {\n\n            // Check if focus went out of bounds in the direction of the origin toggle button\n            if (this.toggleButtonPosition === 'bottom') {\n                this.moveToToggleButton(event);\n            }\n        }\n    }\n\n    private movePrevious(event: KeyboardEvent): void {\n\n        // Do nothing if there's no active menu item registered\n        if (this.activeIndex < 0) {\n            return;\n        }\n\n        const nextIndex = this.activeIndex - 1;\n        if (nextIndex >= 0) {\n\n            // Activate the previous menu item\n            // (uxMenuNavigationItem subscribes to this and applies focus if it matches)\n            this._menuNavigationService.active$.next(this.menuItems[nextIndex]);\n\n        } else {\n\n            // Check if focus went out of bounds in the direction of the origin toggle button\n            if (this.toggleButtonPosition === 'top') {\n                this.moveToToggleButton(event);\n            }\n        }\n    }\n\n    private moveFirst(): void {\n        if (this.menuItems.length > 0) {\n            this._menuNavigationService.active$.next(this.menuItems[0]);\n        }\n    }\n\n    private moveLast(): void {\n        if (this.menuItems.length > 0) {\n            this._menuNavigationService.active$.next(this.menuItems[this.menuItems.length - 1]);\n        }\n    }\n\n    private moveToToggleButton(event: KeyboardEvent): void {\n        if (this.toggleButton) {\n            this.toggleButton.focus('keyboard');\n            this.toggleButton.menuOpen = false;\n        }\n\n        this.navigatedOut.emit(event);\n    }\n}"]}