Print Preview: Handle a crashed initiator tab by showing a message in PP.

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 64 matching lines @@
 const maxCloudPrinters = 10;
 
 /**
  * Window onload handler, sets up the page and starts print preview by getting
  * the printer list.
  */
 function onLoad() {
   cr.enablePlatformSpecificCSSRules();
 
   if (!checkCompatiblePluginExists()) {
-    disableInputElementsInSidebar();
     displayErrorMessageWithButton(localStrings.getString('noPlugin'),
                                   localStrings.getString('launchNativeDialog'),
                                   launchNativePrintDialog);
     $('mainview').parentElement.removeChild($('dummy-viewer'));
     return;
   }
 
   $('system-dialog-link').addEventListener('click', onSystemDialogLinkClicked);
   $('mainview').parentElement.removeChild($('dummy-viewer'));
 
@@ skipping 59 matching lines @@
  */
 function launchNativePrintDialog() {
   showingSystemDialog = true;
   $('error-button').disabled = true;
   $('native-print-dialog-throbber').classList.remove('hidden');
   chrome.send('showSystemDialog');
 }
 
 /**
  * Disables the controls which need the initiator tab to generate preview
+ * data. This function is called when the initiator tab has crashed.
+ * @param {string} initiatorTabURL The URL of the initiator tab.
+ */
+function onInitiatorTabCrashed(initiatorTabURL) {
+  displayErrorMessageWithButton(
+      localStrings.getString('initiatorTabCrashed'),
+      localStrings.getString('reopenPage'),
+      function() { chrome.send('reloadCrashedInitiatorTab') });

[dpapad, 2011/08/08 22:01:58]

Nit: add a semicolon after chrome.send('reloadCrashedInitiatorTab')

[kmadhusu, 2011/08/10 16:46:59]

Done.

+}
+
+/**
+ * Disables the controls which need the initiator tab to generate preview
  * data. This function is called when the initiator tab is closed.
  * @param {string} initiatorTabURL The URL of the initiator tab.
  */
 function onInitiatorTabClosed(initiatorTabURL) {
-  disableInputElementsInSidebar();
   displayErrorMessageWithButton(
       localStrings.getString('initiatorTabClosed'),
       localStrings.getString('reopenPage'),
       function() { window.location = initiatorTabURL; });
 }
 
 /**
  * Gets the selected printer capabilities and updates the controls accordingly.
  */
 function updateControlsWithSelectedPrinterCapabilities() {
@@ skipping 563 matching lines @@
 /**
  * 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.
  */
 function displayErrorMessageWithButton(
     errorMessage, buttonText, buttonListener) {
+  disableInputElementsInSidebar();
+
   var errorButton = $('error-button');
   errorButton.disabled = false;
   errorButton.textContent = buttonText;
   errorButton.onclick = buttonListener;
   errorButton.classList.remove('hidden');
   $('system-dialog-throbber').classList.add('hidden');
   $('native-print-dialog-throbber').classList.add('hidden');
   displayErrorMessage(errorMessage);
 }
 
@@ skipping 196 matching lines @@
 }
 
 /**
  * Takes a snapshot of the print settings.
  */
 PrintSettings.prototype.save = function() {
   this.deviceName = getSelectedPrinterName();
   this.isLandscape = layoutSettings.isLandscape();
 }