META-INF.dirigible.dev-tools.ui.ZoomManager.js Maven / Gradle / Ivy
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import * as Common from '../common/common.js';
import * as Host from '../host/host.js'; // eslint-disable-line no-unused-vars
/**
* @type {!ZoomManager}
*/
let zoomManagerInstance;
/**
* @unrestricted
*/
export class ZoomManager extends Common.ObjectWrapper.ObjectWrapper {
/**
* @private
* @param {!Window} window
* @param {!Host.InspectorFrontendHostAPI.InspectorFrontendHostAPI} frontendHost
*/
constructor(window, frontendHost) {
super();
this._frontendHost = frontendHost;
this._zoomFactor = this._frontendHost.zoomFactor();
window.addEventListener('resize', this._onWindowResize.bind(this), true);
}
/**
* @param {{forceNew: ?boolean, win: ?Window, frontendHost: ?Host.InspectorFrontendHostAPI.InspectorFrontendHostAPI}} opts
*/
static instance(opts = {forceNew: null, win: null, frontendHost: null}) {
const {forceNew, win, frontendHost} = opts;
if (!zoomManagerInstance || forceNew) {
if (!win || !frontendHost) {
throw new Error(
`Unable to create zoom manager: window and frontendHost must be provided: ${new Error().stack}`);
}
zoomManagerInstance = new ZoomManager(win, frontendHost);
}
return zoomManagerInstance;
}
/**
* @return {number}
*/
zoomFactor() {
return this._zoomFactor;
}
/**
* @param {number} value
* @return {number}
*/
cssToDIP(value) {
return value * this._zoomFactor;
}
/**
* @param {number} valueDIP
* @return {number}
*/
dipToCSS(valueDIP) {
return valueDIP / this._zoomFactor;
}
_onWindowResize() {
const oldZoomFactor = this._zoomFactor;
this._zoomFactor = this._frontendHost.zoomFactor();
if (oldZoomFactor !== this._zoomFactor) {
this.dispatchEventToListeners(Events.ZoomChanged, {from: oldZoomFactor, to: this._zoomFactor});
}
}
}
/** @enum {symbol} */
export const Events = {
ZoomChanged: Symbol('ZoomChanged')
};