/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import { Emitter, Event } from '../../../../vs/base/common/event';

export interface IEditorZoom {
  onDidChangeZoomLevel: Event<number>;
  getZoomLevel(): number;
  setZoomLevel(zoomLevel: number): void;
}

export const EditorZoom: IEditorZoom = new (class implements IEditorZoom {
  private _zoomLevel: number = 0;

  private readonly _onDidChangeZoomLevel = new Emitter<number>();
  public readonly onDidChangeZoomLevel: Event<number> =
    this._onDidChangeZoomLevel.event;

  public getZoomLevel(): number {
    return this._zoomLevel;
  }

  public setZoomLevel(zoomLevel: number): void {
    zoomLevel = Math.min(Math.max(-5, zoomLevel), 20);
    if (this._zoomLevel === zoomLevel) {
      return;
    }

    this._zoomLevel = zoomLevel;
    this._onDidChangeZoomLevel.fire(this._zoomLevel);
  }
})();