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// Copyright (c) 2011 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.
cr.define('print_preview', function() {
'strict';
/**
* Creates a PreviewArea object. It represents the area where the preview
* document is displayed.
* @constructor
*/
function PreviewArea() {
// The embedded pdf plugin object.
this.pdfPlugin_ = null;
// @type {HTMLDivElement} A layer on top of |this.pdfPlugin_| used for
// displaying messages to the user.
this.overlayLayer = $('overlay-layer');
// @type {HTMLDivElement} Contains text displayed to the user followed by
// three animated dots.
this.customMessageWithDots_ = $('custom-message-with-dots');
// @type {HTMLDivElement} Contains text displayed to the user.
this.customMessage_ = $('custom-message');
// @type {HTMLInputElement} Button associated with a displayed error
// message.
this.errorButton = $('error-button');
// @type {HTMLDivElement} Contains three animated (dancing) dots.
this.dancingDotsText = $('dancing-dots-text');
// True if the pdf document is loaded in the preview area.
this.pdfLoaded_ = false;
// Contains the zoom level just before a new preview is requested so the
// same zoom level can be restored.
this.zoomLevel_ = null;
// @type {{x: number, y: number}} Contains the page offset values just
// before a new preview is requested so that the scroll amount can be
// restored later.
this.pageOffset_ = null;
// @type {print_preview.Rect} A rectangle describing the postion of the
// most visible page normalized with respect to the total height and width
// of the plugin.
this.pageLocationNormalized = null;
// @type {EventTracker} Used to keep track of certain event listeners.
this.eventTracker = new EventTracker();
this.addEventListeners_();
}
cr.addSingletonGetter(PreviewArea);
PreviewArea.prototype = {
/**
* The width of the plugin area in pixels, excluding any visible scrollbars,
* @type {number}
*/
get width() {
return this.widthPercent * this.pdfPlugin_.offsetWidth;
},
/**
* The height of the plugin area in pixels, excluding any visible
* scrollbars.
* @type {number}
*/
get height() {
return this.heightPercent * this.pdfPlugin_.offsetHeight;
},
/**
* The width of the plugin area in percent, excluding any visible
* scrollbars.
* @type {number}
*/
get widthPercent() {
var width = this.pdfPlugin_.getWidth();
var scrollbarWidth = this.pdfPlugin_.getVerticalScrollbarThickness();
return (width - scrollbarWidth) / width;
},
/**
* The height of the plugin area in percent, excluding any visible
* scrollbars.
* @type {number}
*/
get heightPercent() {
var height = this.pdfPlugin_.getHeight();
var scrollbarHeight = this.pdfPlugin_.getHorizontalScrollbarThickness();
return (height - scrollbarHeight) / height;
},
get pdfLoaded() {
return this.pdfLoaded_;
},
set pdfLoaded(pdfLoaded) {
this.pdfLoaded_ = pdfLoaded;
},
/**
* Queries the plugin for the location of the most visible page and updates
* |this.pageLocationNormalized|.
*/
update: function() {
if (!this.pdfLoaded_)
return;
var pluginLocation =
this.pdfPlugin_.getPageLocationNormalized().split(';');
this.pageLocationNormalized = new print_preview.Rect(
parseFloat(pluginLocation[0]),
parseFloat(pluginLocation[1]),
parseFloat(pluginLocation[2]),
parseFloat(pluginLocation[3]));
},
/**
* Resets the state variables of |this|.
*/
resetState: function() {
if (this.pdfPlugin_) {
this.zoomLevel_ = this.pdfPlugin_.getZoomLevel();
this.pageOffset_ = {
x: this.pdfPlugin_.pageXOffset(),
y: this.pdfPlugin_.pageYOffset()
};
}
this.pdfLoaded_ = false;
},
/**
* Adds event listeners for various events.
* @private
*/
addEventListeners_: function() {
document.addEventListener(customEvents.PDF_LOADED,
this.onPDFLoaded_.bind(this));
},
/**
* Listener executing when a |customEvents.PDF_LOADED| event occurs.
* @private
*/
onPDFLoaded_: function() {
this.pdfPlugin_ = $('pdf-viewer');
this.pdfLoaded_ = true;
if (this.zoomLevel_ != null && this.pageOffset_ != null) {
this.pdfPlugin_.setZoomLevel(this.zoomLevel_);
this.pdfPlugin_.setPageXOffset(this.pageOffset_.x);
this.pdfPlugin_.setPageYOffset(this.pageOffset_.y);
} else {
this.pdfPlugin_.fitToHeight();
}
},
/**
* Hides the |this.overlayLayer| and any messages currently displayed.
*/
hideOverlayLayer: function() {
this.eventTracker.add(this.overlayLayer, 'webkitTransitionEnd',
this.hideOverlayLayerCleanup_.bind(this), false);
if (this.pdfPlugin_)
this.pdfPlugin_.classList.remove('invisible');
this.overlayLayer.classList.add('invisible');
},
/**
* Displays the "Preview loading..." animation.
*/
showLoadingAnimation: function() {
this.showCustomMessage(localStrings.getString('loading'));
},
/**
* Necessary cleanup so that the dancing dots animation is not being
* rendered in the background when not displayed.
*/
hideOverlayLayerCleanup_: function() {
this.customMessageWithDots_.hidden = true;
this.eventTracker.remove(this.overlayLayer, 'webkitTransitionEnd');
},
/**
* Displays |message| followed by three dancing dots animation.
* @param {string} message The message to be displayed.
*/
showCustomMessage: function(message) {
this.customMessageWithDots_.innerHTML = message +
this.dancingDotsText.innerHTML;
this.customMessageWithDots_.hidden = false;
if (this.pdfPlugin_)
this.pdfPlugin_.classList.add('invisible');
this.overlayLayer.classList.remove('invisible');
},
/**
* Clears the custom message with dots animation.
*/
clearCustomMessageWithDots: function() {
this.customMessageWithDots_.innerHTML = '';
this.customMessageWithDots_.hidden = true;
},
/**
* Display an error message in the center of the preview area.
* @param {string} errorMessage The error message to be displayed.
*/
displayErrorMessageAndNotify: function(errorMessage) {
this.overlayLayer.classList.remove('invisible');
this.customMessage_.textContent = errorMessage;
this.customMessage_.hidden = false;
this.customMessageWithDots_.innerHTML = '';
this.customMessageWithDots_.hidden = true;
if (this.pdfPlugin_) {
$('mainview').removeChild(this.pdfPlugin_);
this.pdfPlugin_ = null;
}
cr.dispatchSimpleEvent(document, customEvents.PDF_GENERATION_ERROR);
},
/**
* Display an error message in the center of the preview area followed by a
* button.
* @param {string} errorMessage The error message to be displayed.
* @param {string} buttonText The text to be displayed within the button.
* @param {string} buttonListener The listener to be executed when the
* button is clicked.
*/
displayErrorMessageWithButtonAndNotify: function(
errorMessage, buttonText, buttonListener) {
this.errorButton.disabled = false;
this.errorButton.textContent = buttonText;
this.errorButton.onclick = buttonListener;
this.errorButton.hidden = false;
$('system-dialog-throbber').hidden = true;
$('native-print-dialog-throbber').hidden = true;
if (cr.isMac)
$('open-preview-app-throbber').hidden = true;
this.displayErrorMessageAndNotify(errorMessage);
}
};
return {
PreviewArea: PreviewArea,
};
});
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