зеркало из https://github.com/electron/pdf-viewer.git
872 строки
29 KiB
JavaScript
872 строки
29 KiB
JavaScript
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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'use strict';
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/**
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* @return {number} Width of a scrollbar in pixels
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*/
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function getScrollbarWidth() {
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var div = document.createElement('div');
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div.style.visibility = 'hidden';
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div.style.overflow = 'scroll';
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div.style.width = '50px';
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div.style.height = '50px';
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div.style.position = 'absolute';
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document.body.appendChild(div);
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var result = div.offsetWidth - div.clientWidth;
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div.parentNode.removeChild(div);
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return result;
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}
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/**
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* Return the filename component of a URL, percent decoded if possible.
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* @param {string} url The URL to get the filename from.
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* @return {string} The filename component.
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*/
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function getFilenameFromURL(url) {
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// Ignore the query and fragment.
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var mainUrl = url.split(/#|\?/)[0];
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var components = mainUrl.split(/\/|\\/);
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var filename = components[components.length - 1];
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try {
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return decodeURIComponent(filename);
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} catch (e) {
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if (e instanceof URIError)
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return filename;
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throw e;
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}
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}
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/**
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* Called when navigation happens in the current tab.
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* @param {string} url The url to be opened in the current tab.
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*/
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function onNavigateInCurrentTab(url) {
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window.location.href = url;
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}
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/**
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* Called when navigation happens in the new tab.
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* @param {string} url The url to be opened in the new tab.
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*/
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function onNavigateInNewTab(url) {
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window.open(url);
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}
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/**
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* Whether keydown events should currently be ignored. Events are ignored when
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* an editable element has focus, to allow for proper editing controls.
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* @param {HTMLElement} activeElement The currently selected DOM node.
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* @return {boolean} True if keydown events should be ignored.
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*/
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function shouldIgnoreKeyEvents(activeElement) {
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while (activeElement.shadowRoot != null &&
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activeElement.shadowRoot.activeElement != null) {
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activeElement = activeElement.shadowRoot.activeElement;
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}
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return (activeElement.isContentEditable ||
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activeElement.tagName == 'INPUT' ||
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activeElement.tagName == 'TEXTAREA');
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}
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/**
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* The minimum number of pixels to offset the toolbar by from the bottom and
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* right side of the screen.
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*/
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PDFViewer.MIN_TOOLBAR_OFFSET = 15;
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/**
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* The height of the toolbar along the top of the page. The document will be
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* shifted down by this much in the viewport.
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*/
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PDFViewer.MATERIAL_TOOLBAR_HEIGHT = 56;
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/**
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* Minimum height for the material toolbar to show (px). Should match the media
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* query in index-material.css. If the window is smaller than this at load,
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* leave no space for the toolbar.
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*/
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PDFViewer.TOOLBAR_WINDOW_MIN_HEIGHT = 250;
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/**
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* The light-gray background color used for print preview.
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*/
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PDFViewer.LIGHT_BACKGROUND_COLOR = '0xFFCCCCCC';
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/**
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* The dark-gray background color used for the regular viewer.
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*/
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PDFViewer.DARK_BACKGROUND_COLOR = '0xFF525659';
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/**
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* Creates a new PDFViewer. There should only be one of these objects per
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* document.
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* @constructor
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* @param {!BrowserApi} browserApi An object providing an API to the browser.
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*/
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function PDFViewer(browserApi) {
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this.browserApi_ = browserApi;
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this.originalUrl_ = this.browserApi_.getStreamInfo().originalUrl;
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this.loadState_ = LoadState.LOADING;
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this.parentWindow_ = null;
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this.parentOrigin_ = null;
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this.isFormFieldFocused_ = false;
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this.delayedScriptingMessages_ = [];
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this.isPrintPreview_ = this.originalUrl_.indexOf('chrome://print') == 0;
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// Parse open pdf parameters.
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this.paramsParser_ =
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new OpenPDFParamsParser(this.getNamedDestination_.bind(this));
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var toolbarEnabled =
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this.paramsParser_.getUiUrlParams(this.originalUrl_).toolbar &&
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!this.isPrintPreview_;
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// The sizer element is placed behind the plugin element to cause scrollbars
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// to be displayed in the window. It is sized according to the document size
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// of the pdf and zoom level.
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this.sizer_ = $('sizer');
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if (this.isPrintPreview_)
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this.pageIndicator_ = $('page-indicator');
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this.passwordScreen_ = $('password-screen');
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this.passwordScreen_.addEventListener('password-submitted',
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this.onPasswordSubmitted_.bind(this));
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this.errorScreen_ = $('error-screen');
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// Can only reload if we are in a normal tab.
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if (!this.browserApi_.getStreamInfo().embedded) {
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this.errorScreen_.reloadFn = function() {
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chrome.send('reload');
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};
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}
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// Create the viewport.
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var shortWindow = window.innerHeight < PDFViewer.TOOLBAR_WINDOW_MIN_HEIGHT;
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var topToolbarHeight =
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(toolbarEnabled) ? PDFViewer.MATERIAL_TOOLBAR_HEIGHT : 0;
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this.viewport_ = new Viewport(window,
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this.sizer_,
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this.viewportChanged_.bind(this),
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this.beforeZoom_.bind(this),
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this.afterZoom_.bind(this),
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getScrollbarWidth(),
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this.browserApi_.getDefaultZoom(),
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topToolbarHeight);
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// Create the plugin object dynamically so we can set its src. The plugin
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// element is sized to fill the entire window and is set to be fixed
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// positioning, acting as a viewport. The plugin renders into this viewport
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// according to the scroll position of the window.
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this.plugin_ = document.createElement('embed');
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// NOTE: The plugin's 'id' field must be set to 'plugin' since
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// chrome/renderer/printing/print_web_view_helper.cc actually references it.
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this.plugin_.id = 'plugin';
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this.plugin_.type = 'application/x-google-chrome-pdf';
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this.plugin_.addEventListener('message', this.handlePluginMessage_.bind(this),
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false);
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// Handle scripting messages from outside the extension that wish to interact
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// with it. We also send a message indicating that extension has loaded and
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// is ready to receive messages.
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window.addEventListener('message', this.handleScriptingMessage.bind(this),
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false);
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this.plugin_.setAttribute('src', this.originalUrl_);
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this.plugin_.setAttribute('stream-url',
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this.browserApi_.getStreamInfo().streamUrl);
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var headers = '';
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for (var header in this.browserApi_.getStreamInfo().responseHeaders) {
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headers += header + ': ' +
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this.browserApi_.getStreamInfo().responseHeaders[header] + '\n';
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}
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this.plugin_.setAttribute('headers', headers);
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var backgroundColor = PDFViewer.DARK_BACKGROUND_COLOR;
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this.plugin_.setAttribute('background-color', backgroundColor);
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this.plugin_.setAttribute('top-toolbar-height', topToolbarHeight);
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if (!this.browserApi_.getStreamInfo().embedded)
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this.plugin_.setAttribute('full-frame', '');
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this.sizer_.appendChild(this.plugin_);
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// Setup the button event listeners.
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this.zoomToolbar_ = $('zoom-toolbar');
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this.zoomToolbar_.addEventListener('fit-to-width',
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this.viewport_.fitToWidth.bind(this.viewport_));
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this.zoomToolbar_.addEventListener('fit-to-page',
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this.fitToPage_.bind(this));
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this.zoomToolbar_.addEventListener('zoom-in',
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this.viewport_.zoomIn.bind(this.viewport_));
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this.zoomToolbar_.addEventListener('zoom-out',
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this.viewport_.zoomOut.bind(this.viewport_));
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if (toolbarEnabled) {
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this.toolbar_ = $('toolbar');
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this.toolbar_.hidden = false;
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this.toolbar_.addEventListener('save', this.save_.bind(this));
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this.toolbar_.addEventListener('print', this.print_.bind(this));
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this.toolbar_.addEventListener('rotate-right',
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this.rotateClockwise_.bind(this));
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// Must attach to mouseup on the plugin element, since it eats mousedown
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// and click events.
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this.plugin_.addEventListener('mouseup',
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this.toolbar_.hideDropdowns.bind(this.toolbar_));
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this.toolbar_.docTitle = getFilenameFromURL(this.originalUrl_);
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}
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document.body.addEventListener('change-page', function(e) {
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this.viewport_.goToPage(e.detail.page);
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}.bind(this));
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document.body.addEventListener('navigate', function(e) {
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var disposition =
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e.detail.newtab ? Navigator.WindowOpenDisposition.NEW_BACKGROUND_TAB :
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Navigator.WindowOpenDisposition.CURRENT_TAB;
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this.navigator_.navigate(e.detail.uri, disposition);
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}.bind(this));
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this.toolbarManager_ =
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new ToolbarManager(window, this.toolbar_, this.zoomToolbar_);
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// Set up the ZoomManager.
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this.zoomManager_ = new ZoomManager(
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this.viewport_, this.browserApi_.setZoom.bind(this.browserApi_),
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this.browserApi_.getInitialZoom());
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this.browserApi_.addZoomEventListener(
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this.zoomManager_.onBrowserZoomChange.bind(this.zoomManager_));
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// Setup the keyboard event listener.
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document.addEventListener('keydown', this.handleKeyEvent_.bind(this));
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document.addEventListener('mousemove', this.handleMouseEvent_.bind(this));
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document.addEventListener('mouseout', this.handleMouseEvent_.bind(this));
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this.navigator_ = new Navigator(this.originalUrl_,
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this.viewport_, this.paramsParser_,
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onNavigateInCurrentTab,
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onNavigateInNewTab);
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this.viewportScroller_ =
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new ViewportScroller(this.viewport_, this.plugin_, window);
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// Request translated strings.
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cr.sendWithPromise('getStrings').then(this.handleStrings_.bind(this));
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}
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PDFViewer.prototype = {
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/**
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* @private
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* Handle key events. These may come from the user directly or via the
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* scripting API.
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* @param {KeyboardEvent} e the event to handle.
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*/
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handleKeyEvent_: function(e) {
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var position = this.viewport_.position;
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// Certain scroll events may be sent from outside of the extension.
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var fromScriptingAPI = e.fromScriptingAPI;
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if (shouldIgnoreKeyEvents(document.activeElement) || e.defaultPrevented)
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return;
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this.toolbarManager_.hideToolbarsAfterTimeout(e);
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var pageUpHandler = function() {
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// Go to the previous page if we are fit-to-page.
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if (this.viewport_.fittingType == Viewport.FittingType.FIT_TO_PAGE) {
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this.viewport_.goToPage(this.viewport_.getMostVisiblePage() - 1);
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// Since we do the movement of the page.
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e.preventDefault();
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} else if (fromScriptingAPI) {
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position.y -= this.viewport.size.height;
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this.viewport.position = position;
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}
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}.bind(this);
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var pageDownHandler = function() {
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// Go to the next page if we are fit-to-page.
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if (this.viewport_.fittingType == Viewport.FittingType.FIT_TO_PAGE) {
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this.viewport_.goToPage(this.viewport_.getMostVisiblePage() + 1);
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// Since we do the movement of the page.
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e.preventDefault();
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} else if (fromScriptingAPI) {
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position.y += this.viewport.size.height;
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this.viewport.position = position;
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}
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}.bind(this);
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switch (e.keyCode) {
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case 9: // Tab key.
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this.toolbarManager_.showToolbarsForKeyboardNavigation();
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return;
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case 27: // Escape key.
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if (!this.isPrintPreview_) {
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this.toolbarManager_.hideSingleToolbarLayer();
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return;
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}
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break; // Ensure escape falls through to the print-preview handler.
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case 32: // Space key.
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if (e.shiftKey)
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pageUpHandler();
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else
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pageDownHandler();
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return;
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case 33: // Page up key.
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pageUpHandler();
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return;
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case 34: // Page down key.
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pageDownHandler();
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return;
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case 37: // Left arrow key.
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if (!(e.altKey || e.ctrlKey || e.metaKey || e.shiftKey)) {
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// Go to the previous page if there are no horizontal scrollbars and
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// no form field is focused.
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if (!(this.viewport_.documentHasScrollbars().horizontal ||
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this.isFormFieldFocused_)) {
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this.viewport_.goToPage(this.viewport_.getMostVisiblePage() - 1);
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// Since we do the movement of the page.
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e.preventDefault();
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} else if (fromScriptingAPI) {
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position.x -= Viewport.SCROLL_INCREMENT;
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this.viewport.position = position;
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}
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}
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return;
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case 38: // Up arrow key.
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if (fromScriptingAPI) {
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position.y -= Viewport.SCROLL_INCREMENT;
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this.viewport.position = position;
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}
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return;
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case 39: // Right arrow key.
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if (!(e.altKey || e.ctrlKey || e.metaKey || e.shiftKey)) {
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// Go to the next page if there are no horizontal scrollbars and no
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// form field is focused.
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if (!(this.viewport_.documentHasScrollbars().horizontal ||
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this.isFormFieldFocused_)) {
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this.viewport_.goToPage(this.viewport_.getMostVisiblePage() + 1);
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// Since we do the movement of the page.
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e.preventDefault();
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} else if (fromScriptingAPI) {
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position.x += Viewport.SCROLL_INCREMENT;
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this.viewport.position = position;
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}
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}
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return;
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case 40: // Down arrow key.
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if (fromScriptingAPI) {
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position.y += Viewport.SCROLL_INCREMENT;
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this.viewport.position = position;
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}
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return;
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case 65: // a key.
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if (e.ctrlKey || e.metaKey) {
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this.plugin_.postMessage({
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type: 'selectAll'
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});
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// Since we do selection ourselves.
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e.preventDefault();
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}
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return;
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case 71: // g key.
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if (this.toolbar_ && (e.ctrlKey || e.metaKey) && e.altKey) {
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this.toolbarManager_.showToolbars();
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this.toolbar_.selectPageNumber();
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}
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return;
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case 219: // left bracket.
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if (e.ctrlKey)
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this.rotateCounterClockwise_();
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return;
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case 221: // right bracket.
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if (e.ctrlKey)
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this.rotateClockwise_();
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return;
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}
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// Give print preview a chance to handle the key event.
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if (!fromScriptingAPI && this.isPrintPreview_) {
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this.sendScriptingMessage_({
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type: 'sendKeyEvent',
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keyEvent: SerializeKeyEvent(e)
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});
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} else {
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// Show toolbars as a fallback.
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if (!(e.shiftKey || e.ctrlKey || e.altKey))
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this.toolbarManager_.showToolbars();
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}
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},
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handleMouseEvent_: function(e) {
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if (e.type == 'mousemove')
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this.toolbarManager_.handleMouseMove(e);
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else if (e.type == 'mouseout')
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this.toolbarManager_.hideToolbarsForMouseOut();
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},
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/**
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* @private
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* Rotate the plugin clockwise.
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*/
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rotateClockwise_: function() {
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this.plugin_.postMessage({
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type: 'rotateClockwise'
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});
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},
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/**
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* @private
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* Rotate the plugin counter-clockwise.
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*/
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rotateCounterClockwise_: function() {
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this.plugin_.postMessage({
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type: 'rotateCounterclockwise'
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});
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},
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fitToPage_: function() {
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this.viewport_.fitToPage();
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this.toolbarManager_.forceHideTopToolbar();
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},
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/**
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* @private
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* Notify the plugin to print.
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*/
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print_: function() {
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this.plugin_.postMessage({
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type: 'print'
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});
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},
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/**
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* @private
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* Notify the plugin to save.
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*/
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save_: function() {
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this.plugin_.postMessage({
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type: 'save'
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});
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},
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/**
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* Fetches the page number corresponding to the given named destination from
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* the plugin.
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* @param {string} name The namedDestination to fetch page number from plugin.
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*/
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getNamedDestination_: function(name) {
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this.plugin_.postMessage({
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type: 'getNamedDestination',
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namedDestination: name
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});
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},
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/**
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* @private
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* Sends a 'documentLoaded' message to the PDFScriptingAPI if the document has
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* finished loading.
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*/
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sendDocumentLoadedMessage_: function() {
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if (this.loadState_ == LoadState.LOADING)
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return;
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this.sendScriptingMessage_({
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type: 'documentLoaded',
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load_state: this.loadState_
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});
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},
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/**
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* @private
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* Handle open pdf parameters. This function updates the viewport as per
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* the parameters mentioned in the url while opening pdf. The order is
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* important as later actions can override the effects of previous actions.
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* @param {Object} viewportPosition The initial position of the viewport to be
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* displayed.
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*/
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handleURLParams_: function(viewportPosition) {
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if (viewportPosition.page != undefined)
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this.viewport_.goToPage(viewportPosition.page);
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if (viewportPosition.position) {
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// Make sure we don't cancel effect of page parameter.
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this.viewport_.position = {
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x: this.viewport_.position.x + viewportPosition.position.x,
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y: this.viewport_.position.y + viewportPosition.position.y
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};
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}
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if (viewportPosition.zoom)
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this.viewport_.setZoom(viewportPosition.zoom);
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},
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/**
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* @private
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* Update the loading progress of the document in response to a progress
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* message being received from the plugin.
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* @param {number} progress the progress as a percentage.
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*/
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updateProgress_: function(progress) {
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if (this.toolbar_)
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this.toolbar_.loadProgress = progress;
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if (progress == -1) {
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// Document load failed.
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this.errorScreen_.show();
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this.sizer_.style.display = 'none';
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if (this.passwordScreen_.active) {
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this.passwordScreen_.deny();
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this.passwordScreen_.active = false;
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}
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this.loadState_ = LoadState.FAILED;
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this.sendDocumentLoadedMessage_();
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} else if (progress == 100) {
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|
// Document load complete.
|
|
if (this.lastViewportPosition_)
|
|
this.viewport_.position = this.lastViewportPosition_;
|
|
this.paramsParser_.getViewportFromUrlParams(
|
|
this.originalUrl_,
|
|
this.handleURLParams_.bind(this));
|
|
this.loadState_ = LoadState.SUCCESS;
|
|
this.sendDocumentLoadedMessage_();
|
|
while (this.delayedScriptingMessages_.length > 0)
|
|
this.handleScriptingMessage(this.delayedScriptingMessages_.shift());
|
|
|
|
this.toolbarManager_.hideToolbarsAfterTimeout();
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @private
|
|
* Load a dictionary of translated strings into the UI. Used as a callback for
|
|
* chrome.resourcesPrivate.
|
|
* @param {Object} strings Dictionary of translated strings
|
|
*/
|
|
handleStrings_: function(strings) {
|
|
document.documentElement.dir = strings.textdirection;
|
|
document.documentElement.lang = strings.language;
|
|
|
|
$('toolbar').strings = strings;
|
|
$('zoom-toolbar').strings = strings;
|
|
$('password-screen').strings = strings;
|
|
$('error-screen').strings = strings;
|
|
},
|
|
|
|
/**
|
|
* @private
|
|
* An event handler for handling password-submitted events. These are fired
|
|
* when an event is entered into the password screen.
|
|
* @param {Object} event a password-submitted event.
|
|
*/
|
|
onPasswordSubmitted_: function(event) {
|
|
this.plugin_.postMessage({
|
|
type: 'getPasswordComplete',
|
|
password: event.detail.password
|
|
});
|
|
},
|
|
|
|
/**
|
|
* @private
|
|
* An event handler for handling message events received from the plugin.
|
|
* @param {MessageObject} message a message event.
|
|
*/
|
|
handlePluginMessage_: function(message) {
|
|
switch (message.data.type.toString()) {
|
|
case 'documentDimensions':
|
|
this.documentDimensions_ = message.data;
|
|
this.viewport_.setDocumentDimensions(this.documentDimensions_);
|
|
// If we received the document dimensions, the password was good so we
|
|
// can dismiss the password screen.
|
|
if (this.passwordScreen_.active)
|
|
this.passwordScreen_.accept();
|
|
|
|
if (this.pageIndicator_)
|
|
this.pageIndicator_.initialFadeIn();
|
|
|
|
if (this.toolbar_) {
|
|
this.toolbar_.docLength =
|
|
this.documentDimensions_.pageDimensions.length;
|
|
}
|
|
break;
|
|
case 'email':
|
|
var href = 'mailto:' + message.data.to + '?cc=' + message.data.cc +
|
|
'&bcc=' + message.data.bcc + '&subject=' + message.data.subject +
|
|
'&body=' + message.data.body;
|
|
window.location.href = href;
|
|
break;
|
|
case 'getPassword':
|
|
// If the password screen isn't up, put it up. Otherwise we're
|
|
// responding to an incorrect password so deny it.
|
|
if (!this.passwordScreen_.active)
|
|
this.passwordScreen_.active = true;
|
|
else
|
|
this.passwordScreen_.deny();
|
|
break;
|
|
case 'getSelectedTextReply':
|
|
this.sendScriptingMessage_(message.data);
|
|
break;
|
|
case 'goToPage':
|
|
this.viewport_.goToPage(message.data.page);
|
|
break;
|
|
case 'loadProgress':
|
|
this.updateProgress_(message.data.progress);
|
|
break;
|
|
case 'navigate':
|
|
// If in print preview, always open a new tab.
|
|
if (this.isPrintPreview_) {
|
|
this.navigator_.navigate(
|
|
message.data.url,
|
|
Navigator.WindowOpenDisposition.NEW_BACKGROUND_TAB);
|
|
} else {
|
|
this.navigator_.navigate(message.data.url, message.data.disposition);
|
|
}
|
|
break;
|
|
case 'setScrollPosition':
|
|
var position = this.viewport_.position;
|
|
if (message.data.x !== undefined)
|
|
position.x = message.data.x;
|
|
if (message.data.y !== undefined)
|
|
position.y = message.data.y;
|
|
this.viewport_.position = position;
|
|
break;
|
|
case 'cancelStreamUrl':
|
|
//chrome.mimeHandlerPrivate.abortStream();
|
|
break;
|
|
case 'metadata':
|
|
if (message.data.title) {
|
|
document.title = message.data.title;
|
|
} else {
|
|
document.title = getFilenameFromURL(this.originalUrl_);
|
|
}
|
|
this.bookmarks_ = message.data.bookmarks;
|
|
if (this.toolbar_) {
|
|
this.toolbar_.docTitle = document.title;
|
|
this.toolbar_.bookmarks = this.bookmarks;
|
|
}
|
|
break;
|
|
case 'setIsSelecting':
|
|
this.viewportScroller_.setEnableScrolling(message.data.isSelecting);
|
|
break;
|
|
case 'getNamedDestinationReply':
|
|
this.paramsParser_.onNamedDestinationReceived(message.data.pageNumber);
|
|
break;
|
|
case 'formFocusChange':
|
|
this.isFormFieldFocused_ = message.data.focused;
|
|
break;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @private
|
|
* A callback that's called before the zoom changes. Notify the plugin to stop
|
|
* reacting to scroll events while zoom is taking place to avoid flickering.
|
|
*/
|
|
beforeZoom_: function() {
|
|
this.plugin_.postMessage({
|
|
type: 'stopScrolling'
|
|
});
|
|
},
|
|
|
|
/**
|
|
* @private
|
|
* A callback that's called after the zoom changes. Notify the plugin of the
|
|
* zoom change and to continue reacting to scroll events.
|
|
*/
|
|
afterZoom_: function() {
|
|
var position = this.viewport_.position;
|
|
var zoom = this.viewport_.zoom;
|
|
this.plugin_.postMessage({
|
|
type: 'viewport',
|
|
zoom: zoom,
|
|
xOffset: position.x,
|
|
yOffset: position.y
|
|
});
|
|
this.zoomManager_.onPdfZoomChange();
|
|
},
|
|
|
|
/**
|
|
* @private
|
|
* A callback that's called after the viewport changes.
|
|
*/
|
|
viewportChanged_: function() {
|
|
if (!this.documentDimensions_)
|
|
return;
|
|
|
|
// Offset the toolbar position so that it doesn't move if scrollbars appear.
|
|
var hasScrollbars = this.viewport_.documentHasScrollbars();
|
|
var scrollbarWidth = this.viewport_.scrollbarWidth;
|
|
var verticalScrollbarWidth = hasScrollbars.vertical ? scrollbarWidth : 0;
|
|
var horizontalScrollbarWidth =
|
|
hasScrollbars.horizontal ? scrollbarWidth : 0;
|
|
|
|
// Shift the zoom toolbar to the left by half a scrollbar width. This
|
|
// gives a compromise: if there is no scrollbar visible then the toolbar
|
|
// will be half a scrollbar width further left than the spec but if there
|
|
// is a scrollbar visible it will be half a scrollbar width further right
|
|
// than the spec. In RTL layout, the zoom toolbar is on the left side, but
|
|
// the scrollbar is still on the right, so this is not necessary.
|
|
if (!isRTL()) {
|
|
this.zoomToolbar_.style.right = -verticalScrollbarWidth +
|
|
(scrollbarWidth / 2) + 'px';
|
|
}
|
|
// Having a horizontal scrollbar is much rarer so we don't offset the
|
|
// toolbar from the bottom any more than what the spec says. This means
|
|
// that when there is a scrollbar visible, it will be a full scrollbar
|
|
// width closer to the bottom of the screen than usual, but this is ok.
|
|
this.zoomToolbar_.style.bottom = -horizontalScrollbarWidth + 'px';
|
|
|
|
// Update the page indicator.
|
|
var visiblePage = this.viewport_.getMostVisiblePage();
|
|
|
|
if (this.toolbar_)
|
|
this.toolbar_.pageNo = visiblePage + 1;
|
|
|
|
// TODO(raymes): Give pageIndicator_ the same API as toolbar_.
|
|
if (this.pageIndicator_) {
|
|
this.pageIndicator_.index = visiblePage;
|
|
if (this.documentDimensions_.pageDimensions.length > 1 &&
|
|
hasScrollbars.vertical) {
|
|
this.pageIndicator_.style.visibility = 'visible';
|
|
} else {
|
|
this.pageIndicator_.style.visibility = 'hidden';
|
|
}
|
|
}
|
|
|
|
var visiblePageDimensions = this.viewport_.getPageScreenRect(visiblePage);
|
|
var size = this.viewport_.size;
|
|
this.sendScriptingMessage_({
|
|
type: 'viewport',
|
|
pageX: visiblePageDimensions.x,
|
|
pageY: visiblePageDimensions.y,
|
|
pageWidth: visiblePageDimensions.width,
|
|
viewportWidth: size.width,
|
|
viewportHeight: size.height
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Handle a scripting message from outside the extension (typically sent by
|
|
* PDFScriptingAPI in a page containing the extension) to interact with the
|
|
* plugin.
|
|
* @param {MessageObject} message the message to handle.
|
|
*/
|
|
handleScriptingMessage: function(message) {
|
|
if (this.parentWindow_ != message.source) {
|
|
this.parentWindow_ = message.source;
|
|
this.parentOrigin_ = message.origin;
|
|
// Ensure that we notify the embedder if the document is loaded.
|
|
if (this.loadState_ != LoadState.LOADING)
|
|
this.sendDocumentLoadedMessage_();
|
|
}
|
|
|
|
if (this.handlePrintPreviewScriptingMessage_(message))
|
|
return;
|
|
|
|
// Delay scripting messages from users of the scripting API until the
|
|
// document is loaded. This simplifies use of the APIs.
|
|
if (this.loadState_ != LoadState.SUCCESS) {
|
|
this.delayedScriptingMessages_.push(message);
|
|
return;
|
|
}
|
|
|
|
switch (message.data.type.toString()) {
|
|
case 'getSelectedText':
|
|
case 'print':
|
|
case 'selectAll':
|
|
this.plugin_.postMessage(message.data);
|
|
break;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @private
|
|
* Handle scripting messages specific to print preview.
|
|
* @param {MessageObject} message the message to handle.
|
|
* @return {boolean} true if the message was handled, false otherwise.
|
|
*/
|
|
handlePrintPreviewScriptingMessage_: function(message) {
|
|
if (!this.isPrintPreview_)
|
|
return false;
|
|
|
|
switch (message.data.type.toString()) {
|
|
case 'loadPreviewPage':
|
|
this.plugin_.postMessage(message.data);
|
|
return true;
|
|
case 'resetPrintPreviewMode':
|
|
this.loadState_ = LoadState.LOADING;
|
|
if (!this.inPrintPreviewMode_) {
|
|
this.inPrintPreviewMode_ = true;
|
|
this.viewport_.fitToPage();
|
|
}
|
|
|
|
// Stash the scroll location so that it can be restored when the new
|
|
// document is loaded.
|
|
this.lastViewportPosition_ = this.viewport_.position;
|
|
|
|
// TODO(raymes): Disable these properly in the plugin.
|
|
var printButton = $('print-button');
|
|
if (printButton)
|
|
printButton.parentNode.removeChild(printButton);
|
|
var saveButton = $('save-button');
|
|
if (saveButton)
|
|
saveButton.parentNode.removeChild(saveButton);
|
|
|
|
this.pageIndicator_.pageLabels = message.data.pageNumbers;
|
|
|
|
this.plugin_.postMessage({
|
|
type: 'resetPrintPreviewMode',
|
|
url: message.data.url,
|
|
grayscale: message.data.grayscale,
|
|
// If the PDF isn't modifiable we send 0 as the page count so that no
|
|
// blank placeholder pages get appended to the PDF.
|
|
pageCount: (message.data.modifiable ?
|
|
message.data.pageNumbers.length : 0)
|
|
});
|
|
return true;
|
|
case 'sendKeyEvent':
|
|
this.handleKeyEvent_(DeserializeKeyEvent(message.data.keyEvent));
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
},
|
|
|
|
/**
|
|
* @private
|
|
* Send a scripting message outside the extension (typically to
|
|
* PDFScriptingAPI in a page containing the extension).
|
|
* @param {Object} message the message to send.
|
|
*/
|
|
sendScriptingMessage_: function(message) {
|
|
if (this.parentWindow_ && this.parentOrigin_) {
|
|
var targetOrigin;
|
|
// Only send data back to the embedder if it is from the same origin,
|
|
// unless we're sending it to ourselves (which could happen in the case
|
|
// of tests). We also allow documentLoaded messages through as this won't
|
|
// leak important information.
|
|
if (this.parentOrigin_ == window.location.origin)
|
|
targetOrigin = this.parentOrigin_;
|
|
else if (message.type == 'documentLoaded')
|
|
targetOrigin = '*';
|
|
else
|
|
targetOrigin = this.originalUrl_;
|
|
this.parentWindow_.postMessage(message, targetOrigin);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* @type {Viewport} the viewport of the PDF viewer.
|
|
*/
|
|
get viewport() {
|
|
return this.viewport_;
|
|
},
|
|
|
|
/**
|
|
* Each bookmark is an Object containing a:
|
|
* - title
|
|
* - page (optional)
|
|
* - array of children (themselves bookmarks)
|
|
* @type {Array} the top-level bookmarks of the PDF.
|
|
*/
|
|
get bookmarks() {
|
|
return this.bookmarks_;
|
|
}
|
|
};
|