| // Copyright 2013 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'; |
| |
| /** |
| * @return {number} Width of a scrollbar in pixels |
| */ |
| function getScrollbarWidth() { |
| var div = document.createElement('div'); |
| div.style.visibility = 'hidden'; |
| div.style.overflow = 'scroll'; |
| div.style.width = '50px'; |
| div.style.height = '50px'; |
| div.style.position = 'absolute'; |
| document.body.appendChild(div); |
| var result = div.offsetWidth - div.clientWidth; |
| div.parentNode.removeChild(div); |
| return result; |
| } |
| |
| /** |
| * Return the filename component of a URL. |
| * @param {string} url The URL to get the filename from. |
| * @return {string} The filename component. |
| */ |
| function getFilenameFromURL(url) { |
| var components = url.split(/\/|\\/); |
| return components[components.length - 1]; |
| } |
| |
| /** |
| * The minimum number of pixels to offset the toolbar by from the bottom and |
| * right side of the screen. |
| */ |
| PDFViewer.MIN_TOOLBAR_OFFSET = 15; |
| |
| /** |
| * Creates a new PDFViewer. There should only be one of these objects per |
| * document. |
| * @param {Object} streamDetails The stream object which points to the data |
| * contained in the PDF. |
| */ |
| function PDFViewer(streamDetails) { |
| this.streamDetails = streamDetails; |
| this.loaded = false; |
| |
| // The sizer element is placed behind the plugin element to cause scrollbars |
| // to be displayed in the window. It is sized according to the document size |
| // of the pdf and zoom level. |
| this.sizer_ = $('sizer'); |
| this.toolbar_ = $('toolbar'); |
| this.pageIndicator_ = $('page-indicator'); |
| this.progressBar_ = $('progress-bar'); |
| this.passwordScreen_ = $('password-screen'); |
| this.passwordScreen_.addEventListener('password-submitted', |
| this.onPasswordSubmitted_.bind(this)); |
| this.errorScreen_ = $('error-screen'); |
| |
| // Create the viewport. |
| this.viewport_ = new Viewport(window, |
| this.sizer_, |
| this.viewportChanged_.bind(this), |
| this.beforeZoom_.bind(this), |
| this.afterZoom_.bind(this), |
| getScrollbarWidth()); |
| // Create the plugin object dynamically so we can set its src. The plugin |
| // element is sized to fill the entire window and is set to be fixed |
| // positioning, acting as a viewport. The plugin renders into this viewport |
| // according to the scroll position of the window. |
| this.plugin_ = document.createElement('embed'); |
| // NOTE: The plugin's 'id' field must be set to 'plugin' since |
| // chrome/renderer/printing/print_web_view_helper.cc actually references it. |
| this.plugin_.id = 'plugin'; |
| this.plugin_.type = 'application/x-google-chrome-pdf'; |
| this.plugin_.addEventListener('message', this.handlePluginMessage_.bind(this), |
| false); |
| |
| // Handle scripting messages from outside the extension that wish to interact |
| // with it. We also send a message indicating that extension has loaded and |
| // is ready to receive messages. |
| window.addEventListener('message', this.handleScriptingMessage_.bind(this), |
| false); |
| this.sendScriptingMessage_({type: 'readyToReceive'}); |
| |
| document.title = getFilenameFromURL(this.streamDetails.originalUrl); |
| this.plugin_.setAttribute('src', this.streamDetails.originalUrl); |
| this.plugin_.setAttribute('stream-url', this.streamDetails.streamUrl); |
| var headers = ''; |
| for (var header in this.streamDetails.responseHeaders) { |
| headers += header + ': ' + |
| this.streamDetails.responseHeaders[header] + '\n'; |
| } |
| this.plugin_.setAttribute('headers', headers); |
| |
| if (!this.streamDetails.embedded) |
| this.plugin_.setAttribute('full-frame', ''); |
| document.body.appendChild(this.plugin_); |
| |
| // TODO(raymes): Remove this spurious message once crbug.com/388606 is fixed. |
| // This is a hack to initialize pepper sync scripting and avoid re-entrancy. |
| this.plugin_.postMessage({ |
| type: 'viewport', |
| zoom: 1, |
| xOffset: 0, |
| yOffset: 0 |
| }); |
| |
| // Setup the button event listeners. |
| $('fit-to-width-button').addEventListener('click', |
| this.viewport_.fitToWidth.bind(this.viewport_)); |
| $('fit-to-page-button').addEventListener('click', |
| this.viewport_.fitToPage.bind(this.viewport_)); |
| $('zoom-in-button').addEventListener('click', |
| this.viewport_.zoomIn.bind(this.viewport_)); |
| $('zoom-out-button').addEventListener('click', |
| this.viewport_.zoomOut.bind(this.viewport_)); |
| $('save-button').addEventListener('click', this.save_.bind(this)); |
| $('print-button').addEventListener('click', this.print_.bind(this)); |
| |
| // Setup the keyboard event listener. |
| document.onkeydown = this.handleKeyEvent_.bind(this); |
| |
| // Set up the zoom API. |
| if (this.shouldManageZoom_()) { |
| chrome.tabs.setZoomSettings(this.streamDetails.tabId, |
| {mode: 'manual', scope: 'per-tab'}, |
| this.afterZoom_.bind(this)); |
| chrome.tabs.onZoomChange.addListener(function(zoomChangeInfo) { |
| if (zoomChangeInfo.tabId != this.streamDetails.tabId) |
| return; |
| // If the zoom level is close enough to the current zoom level, don't |
| // change it. This avoids us getting into an infinite loop of zoom changes |
| // due to floating point error. |
| var MIN_ZOOM_DELTA = 0.01; |
| var zoomDelta = Math.abs(this.viewport_.zoom - |
| zoomChangeInfo.newZoomFactor); |
| // We should not change zoom level when we are responsible for initiating |
| // the zoom. onZoomChange() is called before setZoomComplete() callback |
| // when we initiate the zoom. |
| if ((zoomDelta > MIN_ZOOM_DELTA) && !this.setZoomInProgress_) |
| this.viewport_.setZoom(zoomChangeInfo.newZoomFactor); |
| }.bind(this)); |
| } |
| |
| // Parse open pdf parameters. |
| var paramsParser = new OpenPDFParamsParser(this.streamDetails.originalUrl); |
| this.urlParams_ = paramsParser.urlParams; |
| } |
| |
| PDFViewer.prototype = { |
| /** |
| * @private |
| * Handle key events. These may come from the user directly or via the |
| * scripting API. |
| * @param {KeyboardEvent} e the event to handle. |
| */ |
| handleKeyEvent_: function(e) { |
| var position = this.viewport_.position; |
| // Certain scroll events may be sent from outside of the extension. |
| var fromScriptingAPI = e.type == 'scriptingKeypress'; |
| |
| var pageUpHandler = function() { |
| // Go to the previous page if we are fit-to-page. |
| if (this.viewport_.fittingType == Viewport.FittingType.FIT_TO_PAGE) { |
| this.viewport_.goToPage(this.viewport_.getMostVisiblePage() - 1); |
| // Since we do the movement of the page. |
| e.preventDefault(); |
| } else if (fromScriptingAPI) { |
| position.y -= this.viewport.size.height; |
| this.viewport.position = position; |
| } |
| }.bind(this); |
| var pageDownHandler = function() { |
| // Go to the next page if we are fit-to-page. |
| if (this.viewport_.fittingType == Viewport.FittingType.FIT_TO_PAGE) { |
| this.viewport_.goToPage(this.viewport_.getMostVisiblePage() + 1); |
| // Since we do the movement of the page. |
| e.preventDefault(); |
| } else if (fromScriptingAPI) { |
| position.y += this.viewport.size.height; |
| this.viewport.position = position; |
| } |
| }.bind(this); |
| |
| switch (e.keyCode) { |
| case 32: // Space key. |
| if (e.shiftKey) |
| pageUpHandler(); |
| else |
| pageDownHandler(); |
| return; |
| case 33: // Page up key. |
| pageUpHandler(); |
| return; |
| case 34: // Page down key. |
| pageDownHandler(); |
| return; |
| case 37: // Left arrow key. |
| // Go to the previous page if there are no horizontal scrollbars. |
| if (!this.viewport_.documentHasScrollbars().x) { |
| this.viewport_.goToPage(this.viewport_.getMostVisiblePage() - 1); |
| // Since we do the movement of the page. |
| e.preventDefault(); |
| } else if (fromScriptingAPI) { |
| position.x -= Viewport.SCROLL_INCREMENT; |
| this.viewport.position = position; |
| } |
| return; |
| case 38: // Up arrow key. |
| if (fromScriptingAPI) { |
| position.y -= Viewport.SCROLL_INCREMENT; |
| this.viewport.position = position; |
| } |
| return; |
| case 39: // Right arrow key. |
| // Go to the next page if there are no horizontal scrollbars. |
| if (!this.viewport_.documentHasScrollbars().x) { |
| this.viewport_.goToPage(this.viewport_.getMostVisiblePage() + 1); |
| // Since we do the movement of the page. |
| e.preventDefault(); |
| } else if (fromScriptingAPI) { |
| position.x += Viewport.SCROLL_INCREMENT; |
| this.viewport.position = position; |
| } |
| return; |
| case 40: // Down arrow key. |
| if (fromScriptingAPI) { |
| position.y += Viewport.SCROLL_INCREMENT; |
| this.viewport.position = position; |
| } |
| return; |
| case 65: // a key. |
| if (e.ctrlKey || e.metaKey) { |
| this.plugin_.postMessage({ |
| type: 'selectAll', |
| }); |
| } |
| return; |
| case 80: // p key. |
| if (e.ctrlKey || e.metaKey) { |
| this.print_(); |
| // Since we do the printing of the page. |
| e.preventDefault(); |
| } |
| return; |
| case 219: // left bracket. |
| if (e.ctrlKey) { |
| this.plugin_.postMessage({ |
| type: 'rotateCounterclockwise', |
| }); |
| } |
| return; |
| case 221: // right bracket. |
| if (e.ctrlKey) { |
| this.plugin_.postMessage({ |
| type: 'rotateClockwise', |
| }); |
| } |
| return; |
| } |
| }, |
| |
| /** |
| * @private |
| * Notify the plugin to print. |
| */ |
| print_: function() { |
| this.plugin_.postMessage({ |
| type: 'print', |
| }); |
| }, |
| |
| /** |
| * @private |
| * Notify the plugin to save. |
| */ |
| save_: function() { |
| this.plugin_.postMessage({ |
| type: 'save', |
| }); |
| }, |
| |
| /** |
| * @private |
| * Handle open pdf parameters. This function updates the viewport as per |
| * the parameters mentioned in the url while opening pdf. The order is |
| * important as later actions can override the effects of previous actions. |
| */ |
| handleURLParams_: function() { |
| if (this.urlParams_.page) |
| this.viewport_.goToPage(this.urlParams_.page); |
| if (this.urlParams_.position) { |
| // Make sure we don't cancel effect of page parameter. |
| this.viewport_.position = { |
| x: this.viewport_.position.x + this.urlParams_.position.x, |
| y: this.viewport_.position.y + this.urlParams_.position.y |
| }; |
| } |
| if (this.urlParams_.zoom) |
| this.viewport_.setZoom(this.urlParams_.zoom); |
| }, |
| |
| /** |
| * @private |
| * Update the loading progress of the document in response to a progress |
| * message being received from the plugin. |
| * @param {number} progress the progress as a percentage. |
| */ |
| updateProgress_: function(progress) { |
| this.progressBar_.progress = progress; |
| if (progress == -1) { |
| // Document load failed. |
| this.errorScreen_.style.visibility = 'visible'; |
| this.sizer_.style.display = 'none'; |
| this.toolbar_.style.visibility = 'hidden'; |
| if (this.passwordScreen_.active) { |
| this.passwordScreen_.deny(); |
| this.passwordScreen_.active = false; |
| } |
| } else if (progress == 100) { |
| // Document load complete. |
| if (this.lastViewportPosition_) |
| this.viewport_.position = this.lastViewportPosition_; |
| this.handleURLParams_(); |
| this.loaded = true; |
| var loadEvent = new Event('pdfload'); |
| window.dispatchEvent(loadEvent); |
| this.sendScriptingMessage_({ |
| type: 'documentLoaded' |
| }); |
| } |
| }, |
| |
| /** |
| * @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(); |
| |
| this.pageIndicator_.initialFadeIn(); |
| this.toolbar_.initialFadeIn(); |
| 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; |
| var w = window.open(href, '_blank', 'width=1,height=1'); |
| if (w) |
| w.close(); |
| break; |
| case 'getAccessibilityJSONReply': |
| this.sendScriptingMessage_(message.data); |
| 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 'goToPage': |
| this.viewport_.goToPage(message.data.page); |
| break; |
| case 'loadProgress': |
| this.updateProgress_(message.data.progress); |
| break; |
| case 'navigate': |
| if (message.data.newTab) |
| window.open(message.data.url); |
| else |
| window.location.href = message.data.url; |
| 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 'setTranslatedStrings': |
| this.passwordScreen_.text = message.data.getPasswordString; |
| this.progressBar_.text = message.data.loadingString; |
| this.progressBar_.style.visibility = 'visible'; |
| this.errorScreen_.text = message.data.loadFailedString; |
| break; |
| case 'cancelStreamUrl': |
| chrome.streamsPrivate.abort(this.streamDetails.streamUrl); |
| 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; |
| if (this.shouldManageZoom_() && !this.setZoomInProgress_) { |
| this.setZoomInProgress_ = true; |
| chrome.tabs.setZoom(this.streamDetails.tabId, zoom, |
| this.setZoomComplete_.bind(this, zoom)); |
| } |
| this.plugin_.postMessage({ |
| type: 'viewport', |
| zoom: zoom, |
| xOffset: position.x, |
| yOffset: position.y |
| }); |
| }, |
| |
| /** |
| * @private |
| * A callback that's called after chrome.tabs.setZoom is complete. This will |
| * call chrome.tabs.setZoom again if the zoom level has changed since it was |
| * last called. |
| * @param {number} lastZoom the zoom level that chrome.tabs.setZoom was called |
| * with. |
| */ |
| setZoomComplete_: function(lastZoom) { |
| var zoom = this.viewport_.zoom; |
| if (zoom != lastZoom) { |
| chrome.tabs.setZoom(this.streamDetails.tabId, zoom, |
| this.setZoomComplete_.bind(this, zoom)); |
| } else { |
| this.setZoomInProgress_ = false; |
| } |
| }, |
| |
| /** |
| * @private |
| * A callback that's called after the viewport changes. |
| */ |
| viewportChanged_: function() { |
| if (!this.documentDimensions_) |
| return; |
| |
| // Update the buttons selected. |
| $('fit-to-page-button').classList.remove('polymer-selected'); |
| $('fit-to-width-button').classList.remove('polymer-selected'); |
| if (this.viewport_.fittingType == Viewport.FittingType.FIT_TO_PAGE) { |
| $('fit-to-page-button').classList.add('polymer-selected'); |
| } else if (this.viewport_.fittingType == |
| Viewport.FittingType.FIT_TO_WIDTH) { |
| $('fit-to-width-button').classList.add('polymer-selected'); |
| } |
| |
| var hasScrollbars = this.viewport_.documentHasScrollbars(); |
| var scrollbarWidth = this.viewport_.scrollbarWidth; |
| // Offset the toolbar position so that it doesn't move if scrollbars appear. |
| var toolbarRight = Math.max(PDFViewer.MIN_TOOLBAR_OFFSET, scrollbarWidth); |
| var toolbarBottom = Math.max(PDFViewer.MIN_TOOLBAR_OFFSET, scrollbarWidth); |
| if (hasScrollbars.vertical) |
| toolbarRight -= scrollbarWidth; |
| if (hasScrollbars.horizontal) |
| toolbarBottom -= scrollbarWidth; |
| this.toolbar_.style.right = toolbarRight + 'px'; |
| this.toolbar_.style.bottom = toolbarBottom + 'px'; |
| // Hide the toolbar if it doesn't fit in the viewport. |
| if (this.toolbar_.offsetLeft < 0 || this.toolbar_.offsetTop < 0) |
| this.toolbar_.style.visibility = 'hidden'; |
| else |
| this.toolbar_.style.visibility = 'visible'; |
| |
| // Update the page indicator. |
| var visiblePage = this.viewport_.getMostVisiblePage(); |
| 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, |
| }); |
| }, |
| |
| /** |
| * @private |
| * 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) { |
| switch (message.data.type.toString()) { |
| case 'getAccessibilityJSON': |
| case 'loadPreviewPage': |
| this.plugin_.postMessage(message.data); |
| break; |
| case 'resetPrintPreviewMode': |
| 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) |
| }); |
| break; |
| case 'sendKeyEvent': |
| var e = document.createEvent('Event'); |
| e.initEvent('scriptingKeypress'); |
| e.keyCode = message.data.keyCode; |
| this.handleKeyEvent_(e); |
| break; |
| } |
| |
| }, |
| |
| /** |
| * @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) { |
| window.parent.postMessage(message, '*'); |
| }, |
| |
| /** |
| * @private |
| * Return whether this PDFViewer should manage zoom for its containing page. |
| * @return {boolean} Whether this PDFViewer should manage zoom for its |
| * containing page. |
| */ |
| shouldManageZoom_: function() { |
| return !!(chrome.tabs && !this.streamDetails.embedded && |
| this.streamDetails.tabId != -1); |
| }, |
| |
| /** |
| * @type {Viewport} the viewport of the PDF viewer. |
| */ |
| get viewport() { |
| return this.viewport_; |
| } |
| }; |
