debug-server-next
Version:
Dev server for hippy-core.
46 lines (45 loc) • 1.75 kB
JavaScript
// 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.
/* eslint-disable rulesdir/no_underscored_properties */
import * as Common from '../../core/common/common.js';
let zoomManagerInstance;
export class ZoomManager extends Common.ObjectWrapper.ObjectWrapper {
_frontendHost;
_zoomFactor;
constructor(window, frontendHost) {
super();
this._frontendHost = frontendHost;
this._zoomFactor = this._frontendHost.zoomFactor();
window.addEventListener('resize', this._onWindowResize.bind(this), true);
}
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;
}
static removeInstance() {
zoomManagerInstance = undefined;
}
zoomFactor() {
return this._zoomFactor;
}
cssToDIP(value) {
return value * this._zoomFactor;
}
dipToCSS(valueDIP) {
return valueDIP / this._zoomFactor;
}
_onWindowResize() {
const oldZoomFactor = this._zoomFactor;
this._zoomFactor = this._frontendHost.zoomFactor();
if (oldZoomFactor !== this._zoomFactor) {
this.dispatchEventToListeners("ZoomChanged" /* ZoomChanged */, { from: oldZoomFactor, to: this._zoomFactor });
}
}
}