@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
211 lines • 32.1 kB
JavaScript
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { SPACE } from '@angular/cdk/keycodes';
import { ChangeDetectorRef, Directive, ElementRef, EventEmitter, HostBinding, HostListener, inject, Input, Output } from '@angular/core';
import { Subject } from 'rxjs';
import { debounceTime, map, skip, takeUntil, tap } from 'rxjs/operators';
import { FocusIndicatorService, ManagedFocusContainerService } from '../accessibility/index';
import { SelectionService } from './selection.service';
import * as i0 from "@angular/core";
export class SelectionItemDirective {
/** Defines whether or not this item is currently selected. */
set selected(selected) {
selected ? this.select() : this.deselect();
}
get selected() {
return this._selected;
}
/** Determine whether or not this item can be selected */
set uxSelectionDisabled(isDisabled) {
// if this item was selected then deselect it
if (this._selected && isDisabled) {
this.deselect();
}
// inform the selection service of the disabled state
this._selectionService.setItemDisabled(this.uxSelectionItem, isDisabled);
// store the current disabled state
this._isDisabled = isDisabled;
}
/** Whether aria-selected is added to the host element */
set addAriaAttributes(value) {
this._addAriaAttributes = coerceBooleanProperty(value);
}
get addAriaAttributes() {
return this._addAriaAttributes;
}
get attrTabIndex() {
return (this.tabindex !== null) ? this.tabindex : this._managedTabIndex;
}
constructor() {
this.focusIndicatorService = inject(FocusIndicatorService);
this._selectionService = inject(SelectionService);
this._elementRef = inject(ElementRef);
this._managedFocusContainerService = inject(ManagedFocusContainerService);
this._changeDetector = inject(ChangeDetectorRef);
/** Defines the tab index of the row */
this.tabindex = null;
/** Defines whether or not this item is currently selected. */
this.selectedChange = new EventEmitter();
/** Store whether this item is the focusable item */
this.active = false;
/** Store the focused state of the element */
this.isFocused = false;
/** Store the current selected state */
this._selected = false;
/** Store the disabled state */
this._isDisabled = false;
/** Store the tab indexed if using the managed focus container */
this._managedTabIndex = -1;
/** Determine if there is a pending state change as we debounce before emitting */
this._hasPendingStateChange = false;
/** Store value for _addAriaAttributes */
this._addAriaAttributes = true;
/** Automatically unsubscribe when the component is destroyed */
this._onDestroy = new Subject();
this._focusIndicator = this.focusIndicatorService.monitor(this._elementRef.nativeElement);
}
ngOnInit() {
// if there is no associated data then throw an error
if (!this.uxSelectionItem) {
throw new Error('The uxSelectionItem directive must have data associated with it.');
}
// subscribe to changes to the active state
this._selectionService.active$.pipe(takeUntil(this._onDestroy), map(active => active === this.uxSelectionItem)).subscribe(active => {
// store the focus state
this.active = active;
// if it is active then focus the element
if (active === true) {
this._selectionService.focus$.next(this.uxSelectionItem);
this._elementRef.nativeElement.focus();
}
});
// Subscribe to changes to the focus target
// This is mostly the same as active$, except that it has an initial value of the first item in the collection.
this._selectionService.focus$.pipe(takeUntil(this._onDestroy)).subscribe(focusTarget => {
this._managedTabIndex = (focusTarget === this.uxSelectionItem) ? 0 : -1;
});
// Watch for focus within the container element and manage tabindex of descendants
this._managedFocusContainerService.register(this._elementRef.nativeElement, this);
// Listen for changes to the focus state and apply the appropriate class
this._focusIndicator.origin$.pipe(map(origin => origin === 'keyboard'), takeUntil(this._onDestroy))
.subscribe(isFocused => {
this.isFocused = isFocused;
this._changeDetector.markForCheck();
});
}
ngOnChanges(changes) {
if (changes.uxSelectionItem) {
this.updateSelectionItem();
}
}
ngOnDestroy() {
this._onDestroy.next();
this._onDestroy.complete();
this._focusIndicator.destroy();
this._managedFocusContainerService.unregister(this._elementRef.nativeElement, this);
}
click(event) {
if (!this._isDisabled && !this._hasPendingStateChange && this._selectionService.isEnabled && this._selectionService.isClickEnabled) {
this._selectionService.strategy.click(event, this.uxSelectionItem);
}
}
mousedown(event) {
if (!this._isDisabled && this._selectionService.isEnabled && this._selectionService.isClickEnabled) {
this._selectionService.strategy.mousedown(event, this.uxSelectionItem);
}
}
keydown(event) {
// if the space key (selection key) is pressed and we are disabled then we should block
// the event from propagating. However if this is a key such as arrow presses then we do
// still want this to propagate to allow keyboard navigation for accessibility purposes.
const isDisabled = this._isDisabled && event.keyCode === SPACE;
if (!isDisabled && this._selectionService.isEnabled && this._selectionService.isKeyboardEnabled) {
this._selectionService.strategy.keydown(event, this.uxSelectionItem);
}
}
focus() {
// If tabbed to from outside the component, activate.
if (this._selectionService.active$.getValue() !== this.uxSelectionItem) {
this._selectionService.activate(this.uxSelectionItem);
}
}
/**
* Select this item using the current strategy
*/
select() {
if (!this._isDisabled && this._selectionService.isEnabled) {
this._selectionService.strategy.select(this.uxSelectionItem);
}
}
/**
* Deselect this item using the current strategy
*/
deselect() {
if (!this._isDisabled && this._selectionService.isEnabled) {
this._selectionService.strategy.deselect(this.uxSelectionItem);
}
}
updateSelectionItem() {
if (this._selectionStateSubscription) {
this._selectionStateSubscription.unsubscribe();
}
// subscribe to selection changes on this item (don't emit the initial value)
this._selectionStateSubscription = this._selectionService.getSelectionState(this.uxSelectionItem).pipe(skip(1), tap(() => this._hasPendingStateChange = true), debounceTime(0), takeUntil(this._onDestroy)).subscribe(selected => {
this._hasPendingStateChange = false;
if (this._selected === selected) {
return;
}
// store the selected state
this._selected = selected;
// emit the selected state
this.selectedChange.emit(selected);
this._changeDetector.markForCheck();
});
this._selected = this._selectionService.isSelected(this.uxSelectionItem);
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: SelectionItemDirective, deps: [], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.2.12", type: SelectionItemDirective, selector: "[uxSelectionItem]", inputs: { uxSelectionItem: "uxSelectionItem", selected: "selected", tabindex: "tabindex", uxSelectionDisabled: "uxSelectionDisabled", addAriaAttributes: "addAriaAttributes" }, outputs: { selectedChange: "selectedChange" }, host: { listeners: { "click": "click($event)", "mousedown": "mousedown($event)", "keydown": "keydown($event)", "focus": "focus()" }, properties: { "attr.aria-selected": "addAriaAttributes ? selected : null", "class.ux-selection-selected": "this.selected", "class.ux-selection-focused": "this.isFocused", "attr.tabindex": "this.attrTabIndex" } }, exportAs: ["ux-selection-item"], usesOnChanges: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: SelectionItemDirective, decorators: [{
type: Directive,
args: [{
selector: '[uxSelectionItem]',
exportAs: 'ux-selection-item',
host: {
'[attr.aria-selected]': 'addAriaAttributes ? selected : null',
}
}]
}], ctorParameters: () => [], propDecorators: { uxSelectionItem: [{
type: Input
}], selected: [{
type: Input
}, {
type: HostBinding,
args: ['class.ux-selection-selected']
}], tabindex: [{
type: Input
}], uxSelectionDisabled: [{
type: Input
}], addAriaAttributes: [{
type: Input
}], selectedChange: [{
type: Output
}], isFocused: [{
type: HostBinding,
args: ['class.ux-selection-focused']
}], attrTabIndex: [{
type: HostBinding,
args: ['attr.tabindex']
}], click: [{
type: HostListener,
args: ['click', ['$event']]
}], mousedown: [{
type: HostListener,
args: ['mousedown', ['$event']]
}], keydown: [{
type: HostListener,
args: ['keydown', ['$event']]
}], focus: [{
type: HostListener,
args: ['focus']
}] } });
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{ BooleanInput, coerceBooleanProperty } from '@angular/cdk/coercion';\r\nimport { SPACE } from '@angular/cdk/keycodes';\r\nimport { ChangeDetectorRef, Directive, ElementRef, EventEmitter, HostBinding, HostListener, inject, Input, OnChanges, OnDestroy, OnInit, Output, SimpleChanges } from '@angular/core';\r\nimport { Subject, Subscription } from 'rxjs';\r\nimport { debounceTime, map, skip, takeUntil, tap } from 'rxjs/operators';\r\nimport { FocusIndicator, FocusIndicatorService, ManagedFocusContainerService } from '../accessibility/index';\r\nimport { SelectionService } from './selection.service';\r\n\r\n@Directive({\r\n    selector: '[uxSelectionItem]',\r\n    exportAs: 'ux-selection-item',\r\n    host: {\r\n        '[attr.aria-selected]': 'addAriaAttributes ? selected : null',\r\n    }\r\n})\r\nexport class SelectionItemDirective<T> implements OnInit, OnChanges, OnDestroy {\r\n    readonly focusIndicatorService = inject(FocusIndicatorService);\r\n\r\n    private readonly _selectionService = inject<SelectionService<T>>(SelectionService);\r\n\r\n    private readonly _elementRef = inject(ElementRef);\r\n\r\n    private readonly _managedFocusContainerService = inject(ManagedFocusContainerService);\r\n\r\n    private readonly _changeDetector = inject(ChangeDetectorRef);\r\n\r\n    /** Defines the data associated with this item. */\r\n    @Input() uxSelectionItem: T;\r\n\r\n    /** Defines whether or not this item is currently selected. */\r\n    @Input()\r\n    @HostBinding('class.ux-selection-selected')\r\n    set selected(selected: boolean) {\r\n        selected ? this.select() : this.deselect();\r\n    }\r\n\r\n    get selected(): boolean {\r\n        return this._selected;\r\n    }\r\n\r\n    /** Defines the tab index of the row */\r\n    @Input() tabindex: number = null;\r\n\r\n    /** Determine whether or not this item can be selected */\r\n    @Input() set uxSelectionDisabled(isDisabled: boolean) {\r\n        // if this item was selected then deselect it\r\n        if (this._selected && isDisabled) {\r\n            this.deselect();\r\n        }\r\n\r\n        // inform the selection service of the disabled state\r\n        this._selectionService.setItemDisabled(this.uxSelectionItem, isDisabled);\r\n\r\n        // store the current disabled state\r\n        this._isDisabled = isDisabled;\r\n    }\r\n\r\n    /** Whether aria-selected is added to the host element */\r\n    @Input() set addAriaAttributes(value: boolean) {\r\n        this._addAriaAttributes = coerceBooleanProperty(value);\r\n    }\r\n\r\n    get addAriaAttributes(): boolean {\r\n        return this._addAriaAttributes;\r\n    }\r\n\r\n    /** Defines whether or not this item is currently selected. */\r\n    @Output() selectedChange = new EventEmitter<boolean>();\r\n\r\n    /** Store whether this item is the focusable item */\r\n    active: boolean = false;\r\n\r\n    /** Store the focused state of the element */\r\n    @HostBinding('class.ux-selection-focused') isFocused: boolean = false;\r\n\r\n    @HostBinding('attr.tabindex')\r\n    get attrTabIndex(): number {\r\n        return (this.tabindex !== null) ? this.tabindex : this._managedTabIndex;\r\n    }\r\n\r\n    /** Store the current selected state */\r\n    private _selected: boolean = false;\r\n\r\n    /** Store the disabled state */\r\n    private _isDisabled: boolean = false;\r\n\r\n    /** Store the tab indexed if using the managed focus container */\r\n    private _managedTabIndex: number = -1;\r\n\r\n    /** Determine if there is a pending state change as we debounce before emitting */\r\n    private _hasPendingStateChange: boolean = false;\r\n\r\n    /** Subscription to the selection state observable. */\r\n    private _selectionStateSubscription: Subscription;\r\n\r\n    /** Store value for _addAriaAttributes */\r\n    private _addAriaAttributes: boolean = true;\r\n\r\n    /** Automatically unsubscribe when the component is destroyed */\r\n    private readonly _onDestroy = new Subject<void>();\r\n\r\n    /** The the instance of the focus indicator */\r\n    private readonly _focusIndicator: FocusIndicator;\r\n\r\n    constructor() {\r\n        this._focusIndicator = this.focusIndicatorService.monitor(this._elementRef.nativeElement);\r\n    }\r\n\r\n    ngOnInit(): void {\r\n\r\n        // if there is no associated data then throw an error\r\n        if (!this.uxSelectionItem) {\r\n            throw new Error('The uxSelectionItem directive must have data associated with it.');\r\n        }\r\n\r\n        // subscribe to changes to the active state\r\n        this._selectionService.active$.pipe(takeUntil(this._onDestroy), map(active => active === this.uxSelectionItem)).subscribe(active => {\r\n\r\n            // store the focus state\r\n            this.active = active;\r\n\r\n            // if it is active then focus the element\r\n            if (active === true) {\r\n                this._selectionService.focus$.next(this.uxSelectionItem);\r\n                this._elementRef.nativeElement.focus();\r\n            }\r\n        });\r\n\r\n        // Subscribe to changes to the focus target\r\n        // This is mostly the same as active$, except that it has an initial value of the first item in the collection.\r\n        this._selectionService.focus$.pipe(takeUntil(this._onDestroy)).subscribe(focusTarget => {\r\n            this._managedTabIndex = (focusTarget === this.uxSelectionItem) ? 0 : -1;\r\n        });\r\n\r\n        // Watch for focus within the container element and manage tabindex of descendants\r\n        this._managedFocusContainerService.register(this._elementRef.nativeElement, this);\r\n\r\n        // Listen for changes to the focus state and apply the appropriate class\r\n       this._focusIndicator.origin$.pipe(map(origin => origin === 'keyboard'), takeUntil(this._onDestroy))\r\n           .subscribe(isFocused => {\r\n               this.isFocused = isFocused;\r\n               this._changeDetector.markForCheck();\r\n           });\r\n    }\r\n\r\n    ngOnChanges(changes: SimpleChanges): void {\r\n        if (changes.uxSelectionItem) {\r\n            this.updateSelectionItem();\r\n        }\r\n    }\r\n\r\n    ngOnDestroy(): void {\r\n        this._onDestroy.next();\r\n        this._onDestroy.complete();\r\n        this._focusIndicator.destroy();\r\n        this._managedFocusContainerService.unregister(this._elementRef.nativeElement, this);\r\n    }\r\n\r\n    @HostListener('click', ['$event'])\r\n    click(event: MouseEvent): void {\r\n        if (!this._isDisabled && !this._hasPendingStateChange && this._selectionService.isEnabled && this._selectionService.isClickEnabled) {\r\n            this._selectionService.strategy.click(event, this.uxSelectionItem);\r\n        }\r\n    }\r\n\r\n    @HostListener('mousedown', ['$event'])\r\n    mousedown(event: MouseEvent): void {\r\n        if (!this._isDisabled && this._selectionService.isEnabled && this._selectionService.isClickEnabled) {\r\n            this._selectionService.strategy.mousedown(event, this.uxSelectionItem);\r\n        }\r\n    }\r\n\r\n    @HostListener('keydown', ['$event'])\r\n    keydown(event: KeyboardEvent): void {\r\n\r\n        // if the space key (selection key) is pressed and we are disabled then we should block\r\n        // the event from propagating. However if this is a key such as arrow presses then we do\r\n        // still want this to propagate to allow keyboard navigation for accessibility purposes.\r\n        const isDisabled = this._isDisabled && event.keyCode === SPACE;\r\n\r\n        if (!isDisabled && this._selectionService.isEnabled && this._selectionService.isKeyboardEnabled) {\r\n            this._selectionService.strategy.keydown(event, this.uxSelectionItem);\r\n        }\r\n    }\r\n\r\n    @HostListener('focus')\r\n    focus(): void {\r\n        // If tabbed to from outside the component, activate.\r\n        if (this._selectionService.active$.getValue() !== this.uxSelectionItem) {\r\n            this._selectionService.activate(this.uxSelectionItem);\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Select this item using the current strategy\r\n     */\r\n    select(): void {\r\n        if (!this._isDisabled && this._selectionService.isEnabled) {\r\n            this._selectionService.strategy.select(this.uxSelectionItem);\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Deselect this item using the current strategy\r\n     */\r\n    deselect(): void {\r\n        if (!this._isDisabled && this._selectionService.isEnabled) {\r\n            this._selectionService.strategy.deselect(this.uxSelectionItem);\r\n        }\r\n    }\r\n\r\n    private updateSelectionItem(): void {\r\n\r\n        if (this._selectionStateSubscription) {\r\n            this._selectionStateSubscription.unsubscribe();\r\n        }\r\n\r\n        // subscribe to selection changes on this item (don't emit the initial value)\r\n        this._selectionStateSubscription = this._selectionService.getSelectionState(this.uxSelectionItem).pipe(\r\n            skip(1),\r\n            tap(() => this._hasPendingStateChange = true),\r\n            debounceTime(0),\r\n            takeUntil(this._onDestroy)\r\n        ).subscribe(selected => {\r\n            this._hasPendingStateChange = false;\r\n\r\n            if (this._selected === selected) {\r\n                return;\r\n            }\r\n\r\n            // store the selected state\r\n            this._selected = selected;\r\n\r\n            // emit the selected state\r\n            this.selectedChange.emit(selected);\r\n\r\n            this._changeDetector.markForCheck();\r\n        });\r\n\r\n        this._selected = this._selectionService.isSelected(this.uxSelectionItem);\r\n    }\r\n\r\n    static ngAcceptInputType_addAriaAttributes: BooleanInput;\r\n}\r\n"]}