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nyxmuks/web/src/util/focus.ts

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TypeScript

// gomuks - A Matrix client written in Go.
// Copyright (C) 2024 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
import { NonNullCachedEventDispatcher, useNonNullEventAsState } from "@/util/eventdispatcher.ts"
export const focused = new NonNullCachedEventDispatcher(document.hasFocus())
window.addEventListener("focus", () => focused.emit(true))
window.addEventListener("blur", () => focused.emit(false))
export default function useFocus() {
return useNonNullEventAsState(focused)
}