@theia/core/src/browser/menu/context-menu-context.ts

// *****************************************************************************
// Copyright (C) 2019 TypeFox and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0.
//
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License v. 2.0 are satisfied: GNU General Public License, version 2
// with the GNU Classpath Exception which is available at
// https://www.gnu.org/software/classpath/license.html.
//
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
// *****************************************************************************

import { injectable } from 'inversify';
import { OS } from '../../common/os';

@injectable()
export class ContextMenuContext {

    protected _altPressed = false;
    get altPressed(): boolean {
        return this._altPressed;
    }

    protected setAltPressed(altPressed: boolean): void {
        this._altPressed = altPressed;
    }

    resetAltPressed(): void {
        this.setAltPressed(false);
    }

    constructor() {
        document.addEventListener('keydown', e => this.setAltPressed(e.altKey || (OS.type() !== OS.Type.OSX && e.shiftKey)), true);
        document.addEventListener('keyup', () => this.resetAltPressed(), true);
    }

}