Added Header and Footer support using Skia

chrome/browser/resources/print_preview/print_preview.js

 // 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.
 
 // require: cr/ui/print_preview_cloud.js
 
 var localStrings = new LocalStrings();
 
 // If useCloudPrint is true we attempt to connect to cloud print
 // and populate the list of printers with cloud print printers.
@@ skipping 94 matching lines @@
   showLoadingAnimation();
   chrome.send('getDefaultPrinter');
 }
 
 /**
  * Adds event listeners to the settings controls.
  */
 function addEventListeners() {
   // Controls that require preview rendering.
   $('printer-list').onchange = updateControlsWithSelectedPrinterCapabilities;
+  $('header-footer').onclick = onHeaderFooterChanged;
 
   // Controls that do not require preview rendering.
   $('color').onclick = function() { setColor(true); };
   $('bw').onclick = function() { setColor(false); };
 }
 
 /**
  * Removes event listeners from the settings controls.
  */
 function removeEventListeners() {
   if (pageSettings)
     clearTimeout(pageSettings.timerId_);
 
   // Controls that require preview rendering
   $('printer-list').onchange = null;
+  $('header-footer').onclick = null;
 
   // Controls that don't require preview rendering.
   $('color').onclick = null;
   $('bw').onclick = null;
 }
 
 /**
  * Disables the input elements in the sidebar.
  */
 function disableInputElementsInSidebar() {
@@ skipping 174 matching lines @@
  *
  * @return {boolean} true if settings are valid, false if not.
  */
 function areSettingsValid() {
   return pageSettings.isPageSelectionValid() &&
       (copiesSettings.isValid() ||
        getSelectedPrinterName() == PRINT_TO_PDF);
 }
 
 /**
+ * Checks whether the Headers and Footers checkbox is checked or not.
+ *
+ * @return {boolean} true if Headers and Footers are checked.
+ */
+function hasHeaderFooter() {
+  return $('header-footer').checked;
+}
+
+/**
  * Creates an object based on the values in the printer settings.
  *
  * @return {Object} Object containing print job settings.
  */
 function getSettings() {
   var deviceName = getSelectedPrinterName();
   var printToPDF = (deviceName == PRINT_TO_PDF);
 
   var settings =
       {'deviceName': deviceName,
        'pageRange': pageSettings.selectedPageRanges,
        'printAll': pageSettings.allPagesRadioButton.checked,
        'duplex': copiesSettings.duplexMode,
        'copies': copiesSettings.numberOfCopies,
        'collate': copiesSettings.isCollated(),
        'landscape': layoutSettings.isLandscape(),
        'color': isColor(),
        'printToPDF': printToPDF,
+       'headerFooter': hasHeaderFooter(),
        'requestID': 0};
 
   var printerList = $('printer-list');
   var selectedPrinter = printerList.selectedIndex;
   if (cloudprint.isCloudPrint(printerList.options[selectedPrinter])) {
     settings['cloudPrintID'] =
         printerList.options[selectedPrinter].value;
   }
   return settings;
 }
@@ skipping 435 matching lines @@
 }
 
 /**
  * Called when the PDF plugin loads its document.
  */
 function onPDFLoad() {
   $('pdf-viewer').fitToHeight();
   setColor($('color').checked);
   hideLoadingAnimation();
 
+  if (!previewModifiable) {

[dpapad, 2011/07/25 15:40:01]

Nit: No need for {}.

[Aayush Kumar, 2011/07/25 18:37:23]

Done.

+    fadeOutElement($('options-option'));
+  }
   cr.dispatchSimpleEvent(document, 'PDFLoaded');
 }
 
 /**
  * Update the page count and check the page range.
  * Called from PrintPreviewUI::OnDidGetPreviewPageCount().
  * @param {number} pageCount The number of pages.
  */
 function onDidGetPreviewPageCount(pageCount) {
   pageSettings.updateState(pageCount);
@@ skipping 53 matching lines @@
   tempPrintSettings.save();
 
   if (printSettings.deviceName != tempPrintSettings.deviceName) {
     updateControlsWithSelectedPrinterCapabilities();
     return true;
   }
   if (printSettings.isLandscape != tempPrintSettings.isLandscape) {
     setDefaultValuesAndRegeneratePreview();
     return true;
   }
+  if (printSettings.hasHeaderFooter != tempPrintSettings.hasHeaderFooter) {
+    requestPrintPreview();
+    return true;
+  }
   if (pageSettings.requestPrintPreviewIfNeeded())
     return true;
 
   return false;
 }
 
 /**
  * Create the PDF plugin or reload the existing one.
  * @param {string} previewUid Preview unique identifier.
  */
@@ skipping 28 matching lines @@
 function checkCompatiblePluginExists() {
   var dummyPlugin = $('dummy-viewer')
   return (dummyPlugin.onload &&
           dummyPlugin.goToPage &&
           dummyPlugin.removePrintButton);
 }
 
 window.addEventListener('DOMContentLoaded', onLoad);
 
 /**
+ * When the user selects or de-selects the headers and footers option then we

[dpapad, 2011/07/25 15:40:01]

Nit: Don't use "we"n in comments.

When the user selects/deselects headers and footers a new preview is requested.

[Aayush Kumar, 2011/07/25 18:37:23]

Done.

+ * regenerate the preview pdf.
+ */
+function onHeaderFooterChanged() {
+  requestPrintPreview();
+}
+
+/**
  * Sets the default values and sends a request to regenerate preview data.
  */
 function setDefaultValuesAndRegeneratePreview() {
   pageSettings.resetState();
   requestPrintPreview();
 }
 
 /**
  * Class that represents the state of the print settings.
  */
 function PrintSettings() {
   this.deviceName = '';
   this.isLandscape = '';
+  this.hasHeaderFooter = '';
 }
 
 /**
  * Takes a snapshot of the print settings.
  */
 PrintSettings.prototype.save = function() {
   this.deviceName = getSelectedPrinterName();
   this.isLandscape = layoutSettings.isLandscape();
+  this.hasHeaderFooter = hasHeaderFooter();
 }