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AfterViewInit,
Component,
DoCheck,
ElementRef,
EventEmitter,
HostListener,
Input,
IterableDiffers,
Output,
ViewChild,
} from '@angular/core';
import {
IndexedItem,
ItemStorage,
isOnlyAltPressedOrNothing,
} from '../utils/internal-utils';
import {
Callback,
Converter,
FocusableElementOwner,
Item,
Key,
hasSublabel,
} from '../utils/util.types';
import { FocusScopeDirective } from '../internal/focus-scope.directive';
import { AutoIdDirective } from '../internal/label-container/label-container.component';
import {
FocusTargetFirst,
FocusTargetLast,
ListBoxDirective,
} from '../internal/listbox.directive';
import {
OverlayContainerComponent,
OverlayLocation,
} from '../internal/overlay-container/overlay-container.component';
import { TextInputComponent } from '../text-input-field/text-input-field.component';
export type KeyFocusTarget =
| Key
| typeof FocusTargetFirst
| typeof FocusTargetLast;
/**
* Internal Base Class to implement pickers
*/
@Component({
template: '',
})
export abstract class BasePickerComponent<T, I extends Item>
implements AfterViewInit, DoCheck, FocusableElementOwner
{
/** If set to true it disables selection of items */
@Input()
public disabled = false;
/**
* Set of item keys that will be rendered as disabled items.
*/
@Input()
public disabledItems: ReadonlySet<string> = new Set();
/** Fires if the picker has focus. */
@Output()
public readonly onFocusEntered: EventEmitter<void> = new EventEmitter<void>();
/** Fires if the picker has lost focus. */
@Output()
public readonly onFocusLeft: EventEmitter<void> = new EventEmitter<void>();
/** @ignore */
@ViewChild('popup')
public popup?: OverlayContainerComponent;
/** @ignore */
@ViewChild(ListBoxDirective)
public menu?: ListBoxDirective;
/** @ignore */
@ViewChild(FocusScopeDirective)
public focusScope?: FocusScopeDirective;
/** @ignore */
@ViewChild('button')
public buttonElement?: ElementRef<HTMLButtonElement>;
/** @ignore */
@ViewChild('readonlyTextInput')
public readonlyTextInput?: TextInputComponent;
/** @ignore */
@ViewChild(AutoIdDirective)
protected autoIdDirective?: AutoIdDirective;
/**
* Decides if the picker renders in a readonly state.
*/
@Input()
public get readonly(): boolean {
return this._readonly;
}
set readonly(value: boolean) {
this._readonly = value;
// waits a tick after re-querying the popup in order for it to be available
setTimeout(() => {
this.connectPopup();
});
}
/** The items to display in the selection list */
@Input()
public get items(): readonly T[] {
return this.storage.values;
}
public set items(items: readonly T[]) {
this.storage.values = items;
}
/** Adapts the domain type T to the internal Item structure */
@Input()
public get itemAdapter(): Converter<T, I> | undefined {
return this.storage.converter;
}
public set itemAdapter(itemAdapter: Converter<T, I> | undefined) {
this.storage.converter = itemAdapter;
}
/** @ignore */
public readonly storage: ItemStorage<T, I>;
/** @ignore */
public _impl_drawerOpen = false;
/** @ignore */
public labelId?: string;
/**
* @ignore
*/
public _overlayLocation: OverlayLocation = 'end-bottom';
/** @ignore */
private keepFocus = false;
/**
* @ignore
*/
private _readonly = false;
/**
* @ignore
*/
private _impl_popupCallback: Callback | undefined;
constructor(private itDiff: IterableDiffers) {
this.storage = new ItemStorage<T, I>(itDiff);
}
/** @ignore */
@HostListener('keydown', ['$event'])
public _impl_onKeyDown(event: KeyboardEvent): void {
if (this.disabled) {
return;
}
const key = event.key;
switch (key) {
case 'Enter':
this._impl_onEnter();
event.preventDefault();
break;
case ' ':
this._impl_onSpace();
event.preventDefault();
break;
case 'ArrowUp':
if (event.altKey) {
this._impl_onUp();
event.preventDefault();
}
break;
case 'ArrowDown':
if (isOnlyAltPressedOrNothing(event)) {
this._impl_onDown();
event.preventDefault();
}
break;
}
}
/** @ignore */
@HostListener('keyup', ['$event'])
public _impl_onKeyUp(event: KeyboardEvent): void {
if (this.disabled) {
return;
}
const key = event.key;
switch (key) {
case 'Enter':
case ' ':
event.preventDefault();
break;
}
}
public focusChild(): boolean {
if (this.disabled) {
return false;
} else if (this.readonly && this.readonlyTextInput) {
return this.readonlyTextInput.focusChild();
} else if (this.buttonElement) {
this.buttonElement.nativeElement.focus();
return true;
} else {
return false;
}
}
/** @ignore */
public ngDoCheck(): void {
this.storage.onCheck();
}
/** @ignore */
public ngAfterViewInit(): void {
this.connectPopup();
// Fix problem in dev-mode - see https://angular.io/errors/NG0100
setTimeout(() => (this.labelId = this.autoIdDirective?.labelId));
}
/** @ignore */
public isFocusWithin(): boolean {
if (this.focusScope !== undefined) {
return this.focusScope.focusWithin;
}
return false;
}
/** @ignore */
public isButtonFocused(): boolean {
return document.activeElement == this.buttonElement?.nativeElement;
}
/** @ignore */
protected _impl_open(focusItem: KeyFocusTarget): void {
focusItem = this._impl_onOpen(focusItem);
this._impl_popupCallback = () => this.menu?.focusItemByKey(focusItem);
this._impl_drawerOpen = true;
}
/** @ignore */
protected _impl_onFocusEntered(): void {
if (!this.keepFocus) {
this.onFocusEntered.emit();
}
}
/** @ignore */
protected _impl_onFocusLeft(relatedTarget?: EventTarget | null): void {
this.keepFocus = this._impl_drawerOpen && relatedTarget === null;
if (this._impl_drawerOpen) {
this._impl_close(this.keepFocus);
}
if (!this.keepFocus) {
this.onFocusLeft.emit();
}
}
/** @ignore */
protected _impl_onButtonClick(): void {
if (this.disabled) {
return;
}
if (this._impl_drawerOpen) {
this._impl_close(true);
} else {
this._impl_open(FocusTargetFirst);
}
}
/** @ignore */
protected _impl_handlePopupVisible(): void {
if (this._impl_popupCallback) {
// Wait a tick because the popup might not be ready to receive the focus
setTimeout(() => {
if (this._impl_popupCallback) {
this._impl_popupCallback();
this._impl_popupCallback = undefined;
}
});
}
}
/** @ignore */
protected _impl_handleHide(): void {
this._impl_close(true);
}
/** @ignore */
protected _impl_onSpace(): void {
this._impl_open(FocusTargetFirst);
}
/** @ignore */
protected _impl_onEnter(): void {
this._impl_open(FocusTargetFirst);
}
/** @ignore */
protected _impl_onDown(): void {
this._impl_open(FocusTargetFirst);
}
/** @ignore */
protected _impl_onUp(): void {
this._impl_open(FocusTargetLast);
}
/** @ignore */
protected _impl_onCancel(): void {
this._impl_close(document.activeElement !== document.body);
}
/**
* @ignore
*/
protected _handleLocationChange(location: OverlayLocation): void {
this._overlayLocation = location;
}
/** @ignore */
protected _getSubLabel(item: IndexedItem<T, I>): string | undefined {
if (hasSublabel(item.item)) {
return item.item.sublabel;
}
return undefined;
}
/** @ignore */
protected _isDisabled(key: Key): boolean {
return this.disabledItems.has(key);
}
/** @ignore */
protected _impl_close(keepFocus: boolean): void {
if (keepFocus) {
this.buttonElement?.nativeElement.focus();
}
this._impl_drawerOpen = false;
}
/** @ignore */
private connectPopup(): void {
if (this.popup) {
this.popup.anker = this.getAnker();
this.popup.scrollTargetElement = this.getScrollTarget();
}
}
/** @ignore */
public abstract getAnker(): ElementRef<HTMLElement>;
/** @ignore */
public abstract getScrollTarget(): ElementRef<HTMLElement> | undefined;
/** @ignore */
protected abstract _impl_onOpen(focusItem: KeyFocusTarget): KeyFocusTarget;
}
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