64 lines
2.2 KiB
TypeScript
64 lines
2.2 KiB
TypeScript
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// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { find as findFirst, findLast, first, last } from 'lodash';
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import { PropsData as ConversationListItemPropsType } from '../conversationList/ConversationListItem';
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import { isConversationUnread } from '../../util/isConversationUnread';
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import { FindDirection, ToFindType } from './LeftPaneHelper';
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/**
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* This will look up or down in an array of conversations for the next one to select.
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* Refer to the tests for the intended behavior.
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*/
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export const getConversationInDirection = (
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conversations: ReadonlyArray<ConversationListItemPropsType>,
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toFind: Readonly<ToFindType>,
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selectedConversationId: undefined | string
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): undefined | { conversationId: string } => {
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// As an optimization, we don't need to search if no conversation is selected.
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const selectedConversationIndex = selectedConversationId
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? conversations.findIndex(({ id }) => id === selectedConversationId)
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: -1;
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let conversation: ConversationListItemPropsType | undefined;
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if (selectedConversationIndex < 0) {
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if (toFind.unreadOnly) {
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conversation =
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toFind.direction === FindDirection.Up
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? findLast(conversations, isConversationUnread)
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: findFirst(conversations, isConversationUnread);
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} else {
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conversation =
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toFind.direction === FindDirection.Up
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? last(conversations)
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: first(conversations);
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}
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} else if (toFind.unreadOnly) {
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conversation =
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toFind.direction === FindDirection.Up
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? findLast(
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conversations.slice(0, selectedConversationIndex),
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isConversationUnread
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)
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: findFirst(
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conversations.slice(selectedConversationIndex + 1),
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isConversationUnread
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);
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} else {
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const newIndex =
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selectedConversationIndex +
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(toFind.direction === FindDirection.Up ? -1 : 1);
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if (newIndex < 0) {
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conversation = last(conversations);
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} else if (newIndex >= conversations.length) {
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conversation = first(conversations);
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} else {
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conversation = conversations[newIndex];
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}
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}
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return conversation ? { conversationId: conversation.id } : undefined;
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};
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