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Component,
ElementRef,
EventEmitter,
HostBinding,
HostListener,
Input,
OnChanges,
Output,
QueryList,
SimpleChanges,
TemplateRef,
ViewChildren,
} from '@angular/core';
import { FocusableElementOwner, Item, Key } from '../utils/util.types';
import { ConversationItemComponent } from '../internal/conversation-item/conversation-item.component';
// Item
type BasicItem = Item;
export type QuestionItem = BasicItem & {
type: 'Question';
time: string;
};
export type AnswerItem = BasicItem & {
type: 'Answer';
time: string;
partial: boolean;
rating?: string;
};
export type HintItem = BasicItem & {
type: 'Hint';
};
export type ConversationItem = QuestionItem | AnswerItem | HintItem;
export function isAnswerItem(i: ConversationItem | undefined): i is AnswerItem {
return i !== undefined && i.type === 'Answer';
}
export function isQuestionItem(
i: ConversationItem | undefined,
): i is QuestionItem {
return i !== undefined && i.type === 'Question';
}
export interface ConversationItemTemplateContext {
$implicit: ConversationItem;
}
@Component({
selector: 'gc-conversation',
templateUrl: './conversation.component.html',
styleUrl: './conversation.component.css',
standalone: false,
})
export class ConversationComponent implements FocusableElementOwner, OnChanges {
/** emitted when a rate answer button is pressed. */
@Output()
public readonly onRateItem: EventEmitter<Key> = new EventEmitter<Key>();
/** The convsation items */
@Input()
public items: readonly ConversationItem[] = [];
/** Optional icon provider to use for the selected entry */
@Input()
public iconProvider?: TemplateRef<ConversationItemTemplateContext>;
/** @ignore */
@HostBinding('tabindex')
protected _tabIndex = -1;
/** @ignore */
@ViewChildren(ConversationItemComponent)
private readonly conversationItems?: QueryList<ConversationItemComponent>;
/** @ignore */
protected _lastFocusItemKey: Key | undefined;
constructor(private readonly host: ElementRef<HTMLElement>) {}
/** @ignore */
@HostListener('focus')
protected _handle_onfocus() {
this._impl_restoreFocus();
}
/** @ignore */
@HostListener('keydown', ['$event'])
protected _handleKeyDown(e: KeyboardEvent) {
switch (e.key) {
case 'ArrowDown':
this._impl_focusDown();
e.preventDefault();
break;
case 'ArrowUp':
this._impl_focusUp();
e.preventDefault();
break;
case 'Home':
this._impl_focusFirst();
e.preventDefault();
break;
case 'End':
this._impl_focusLast();
e.preventDefault();
break;
default:
}
}
/** gives to focus to the item which was focused before. */
public focusChild(): boolean {
return this._impl_restoreFocus();
}
/** focuses the given item */
public focusItem(item: ConversationItem) {
this.conversationItems?.find(it => it.key === item.key)?.focusChild();
}
/** @ignore */
ngOnChanges(changes: SimpleChanges): void {
if ('items' in changes) {
// reset last focus if item was removed
const focusItem = this.items.find(
it => it.key === this._lastFocusItemKey,
);
if (!focusItem) {
this._lastFocusItemKey = undefined;
}
// initialize last focus to last item
if (this._lastFocusItemKey === undefined && this.items.length > 0) {
this._lastFocusItemKey = this.items[this.items.length - 1].key;
}
this._impl_ensure_scrolledToBottom();
}
}
/** @ignore */
protected onItemFocused(it: ConversationItemComponent) {
this._lastFocusItemKey = it.key;
}
/** @ignore */
protected _impl_triggerRating(itemKey: string) {
this.onRateItem.emit(itemKey);
}
/** @ignore */
protected _impl_time(it: ConversationItem) {
if (isAnswerItem(it) || isQuestionItem(it)) {
return it.time;
}
return undefined;
}
/** @ignore */
protected _impl_rating(it: ConversationItem) {
if (isAnswerItem(it)) {
return it.rating;
}
return undefined;
}
/** @ignore */
protected _impl_partial(it: ConversationItem) {
if (isAnswerItem(it)) {
return it.partial;
}
return false;
}
/** @ignore */
private _impl_getLastItem() {
return this.conversationItems?.last;
}
/** @ignore */
private _impl_computeNextKey(key: string): string {
const curIdx = this.items.findIndex(it => it.key === key);
const nextIdx = Math.min(this.items.length - 1, curIdx + 1);
return this.items[nextIdx].key;
}
/** @ignore */
private _impl_computePrevKey(key: string): string {
const curIdx = this.items.findIndex(it => it.key === key);
const nextIdx = Math.max(0, curIdx - 1);
return this.items[nextIdx].key;
}
/** @ignore */
private _impl_getFocusItem() {
return this.conversationItems?.find(
it => it.key === this._lastFocusItemKey,
);
}
/** @ignore */
private _impl_restoreFocus(): boolean {
return this._impl_getFocusItem()?.focusChild() ?? false;
}
/** @ignore */
private _impl_focusFirst() {
const nextKey = this.items[0].key;
const nextItem = this.conversationItems?.find(it => it.key === nextKey);
nextItem?.focusChild();
}
/** @ignore */
private _impl_focusLast() {
const nextKey = this.items[this.items.length - 1].key;
const nextItem = this.conversationItems?.find(it => it.key === nextKey);
nextItem?.focusChild();
}
/** @ignore */
private _impl_focusDown() {
const curItem = this._impl_getFocusItem() ?? this._impl_getLastItem();
if (curItem?.key) {
const nextKey = this._impl_computeNextKey(curItem.key);
const nextItem = this.conversationItems?.find(it => it.key === nextKey);
nextItem?.focusChild();
}
}
/** @ignore */
private _impl_focusUp() {
const curItem = this._impl_getFocusItem() ?? this._impl_getLastItem();
if (curItem?.key) {
const nextKey = this._impl_computePrevKey(curItem.key);
const nextItem = this.conversationItems?.find(it => it.key === nextKey);
nextItem?.focusChild();
}
}
/** @ignore */
private _impl_scrollToBottom() {
const el = this.host.nativeElement;
const bottomPos = el.scrollHeight - el.clientHeight;
el.scrollTop = bottomPos;
}
/** @ignore */
private _impl_isScrolledToBottom() {
const el = this.host.nativeElement;
const bottomPos = el.scrollHeight - el.clientHeight;
return el.scrollTop == bottomPos;
}
/** @ignore */
private _impl_ensure_scrolledToBottom() {
if (this._impl_isScrolledToBottom()) {
setTimeout(() => this._impl_scrollToBottom(), 0);
}
}
}
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