130 lines
3.6 KiB
JavaScript
130 lines
3.6 KiB
JavaScript
// Copyright 2015 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.
|
|
|
|
'use strict';
|
|
|
|
/**
|
|
* Returns a promise that will resolve to the default zoom factor.
|
|
* @return {Promise<number>} A promise that will resolve to the default zoom
|
|
* factor.
|
|
*/
|
|
function lookupDefaultZoom() {
|
|
return cr.sendWithPromise('getDefaultZoom');
|
|
}
|
|
|
|
/**
|
|
* Returns a promise that will resolve to the initial zoom factor
|
|
* upon starting the plugin. This may differ from the default zoom
|
|
* if, for example, the page is zoomed before the plugin is run.
|
|
* @return {Promise<number>} A promise that will resolve to the initial zoom
|
|
* factor.
|
|
*/
|
|
function lookupInitialZoom() {
|
|
return cr.sendWithPromise('getInitialZoom');
|
|
}
|
|
|
|
/**
|
|
* A class providing an interface to the browser.
|
|
*/
|
|
class BrowserApi {
|
|
/**
|
|
* @constructor
|
|
* @param {!Object} streamInfo The stream object which points to the data
|
|
* contained in the PDF.
|
|
* @param {number} defaultZoom The default browser zoom.
|
|
* @param {number} initialZoom The initial browser zoom
|
|
* upon starting the plugin.
|
|
* @param {boolean} manageZoom Whether to manage zoom.
|
|
*/
|
|
constructor(streamInfo, defaultZoom, initialZoom, manageZoom) {
|
|
this.streamInfo_ = streamInfo;
|
|
this.defaultZoom_ = defaultZoom;
|
|
this.initialZoom_ = initialZoom;
|
|
this.manageZoom_ = manageZoom;
|
|
}
|
|
|
|
/**
|
|
* Returns a promise to a BrowserApi.
|
|
* @param {!Object} streamInfo The stream object pointing to the data
|
|
* contained in the PDF.
|
|
* @param {boolean} manageZoom Whether to manage zoom.
|
|
*/
|
|
static create(streamInfo, manageZoom) {
|
|
return Promise.all([
|
|
lookupDefaultZoom(),
|
|
lookupInitialZoom()
|
|
]).then(function(zoomFactors) {
|
|
return new BrowserApi(
|
|
streamInfo, zoomFactors[0], zoomFactors[1], manageZoom);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Returns the stream info pointing to the data contained in the PDF.
|
|
* @return {Object} The stream info object.
|
|
*/
|
|
getStreamInfo() {
|
|
return this.streamInfo_;
|
|
}
|
|
|
|
/**
|
|
* Sets the browser zoom.
|
|
* @param {number} zoom The zoom factor to send to the browser.
|
|
* @return {Promise} A promise that will be resolved when the browser zoom
|
|
* has been updated.
|
|
*/
|
|
setZoom(zoom) {
|
|
if (!this.manageZoom_)
|
|
return Promise.resolve();
|
|
return cr.sendWithPromise('setZoom', zoom);
|
|
}
|
|
|
|
/**
|
|
* Returns the default browser zoom factor.
|
|
* @return {number} The default browser zoom factor.
|
|
*/
|
|
getDefaultZoom() {
|
|
return this.defaultZoom_;
|
|
}
|
|
|
|
/**
|
|
* Returns the initial browser zoom factor.
|
|
* @return {number} The initial browser zoom factor.
|
|
*/
|
|
getInitialZoom() {
|
|
return this.initialZoom_;
|
|
}
|
|
|
|
/**
|
|
* Adds an event listener to be notified when the browser zoom changes.
|
|
* @param {function} listener The listener to be called with the new zoom
|
|
* factor.
|
|
*/
|
|
addZoomEventListener(listener) {
|
|
if (!this.manageZoom_)
|
|
return;
|
|
|
|
cr.addWebUIListener('onZoomLevelChanged', function(newZoomFactor) {
|
|
listener(newZoomFactor);
|
|
});
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Creates a BrowserApi instance for an extension not running as a mime handler.
|
|
* @return {Promise<BrowserApi>} A promise to a BrowserApi instance constructed
|
|
* from the URL.
|
|
*/
|
|
function createBrowserApi(opts) {
|
|
let streamInfo = {
|
|
streamUrl: opts.originalURL,
|
|
originalUrl: opts.originalURL,
|
|
responseHeaders: {},
|
|
embedded: window.parent != window,
|
|
tabId: -1,
|
|
};
|
|
return new Promise(function(resolve, reject) {
|
|
resolve(BrowserApi.create(streamInfo, true));
|
|
});
|
|
}
|