Print Preview: Display a throbber when the user requests the system print

chrome/browser/ui/webui/print_preview_handler.cc

 // 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.
 
 #include "chrome/browser/ui/webui/print_preview_handler.h"
 
 #include <string>
 
 #include "base/i18n/file_util_icu.h"
 #include "base/json/json_reader.h"
@@ skipping 550 matching lines @@
                         printer_name));
 }
 
 void PrintPreviewHandler::HandleShowSystemDialog(const ListValue* args) {
   ReportStats();
   ReportUserActionHistogram(FALLBACK_TO_ADVANCED_SETTINGS_DIALOG);
 
   TabContents* initiator_tab = GetInitiatorTab();
   if (!initiator_tab)
     return;
-  initiator_tab->Activate();
 
   TabContentsWrapper* wrapper =
       TabContentsWrapper::GetCurrentWrapperForContents(initiator_tab);
-  wrapper->print_view_manager()->PrintNow();
-
-  ClosePrintPreviewTab();
+  printing::PrintViewManager* manager = wrapper->print_view_manager();
+  manager->set_observer(this);
+  manager->PrintNow();
 }
 
 void PrintPreviewHandler::HandleManagePrinters(const ListValue* args) {
   ++manage_printers_dialog_request_count_;
   printing::PrinterManagerDialog::ShowPrinterManagerDialog();
 }
 
 void PrintPreviewHandler::HandleClosePreviewTab(const ListValue* args) {
   ReportStats();
   ReportUserActionHistogram(CANCEL);
@@ skipping 52 matching lines @@
   if (!preview_tab_browser)
     return;
   TabStripModel* tabstrip = preview_tab_browser->tabstrip_model();
 
   // Keep print preview tab out of the recently closed tab list, because
   // re-opening that page will just display a non-functional print preview page.
   tabstrip->CloseTabContentsAt(tabstrip->GetIndexOfController(
       &preview_tab()->controller()), TabStripModel::CLOSE_NONE);
 }
 
+void PrintPreviewHandler::OnPrintDialogShown() {
+  TabContents* initiator_tab = GetInitiatorTab();
+  DCHECK(initiator_tab);
+
+  initiator_tab->Activate();
+  ClosePrintPreviewTab();
+}
+
 void PrintPreviewHandler::SelectFile(const FilePath& default_filename) {
   SelectFileDialog::FileTypeInfo file_type_info;
   file_type_info.extensions.resize(1);
   file_type_info.extensions[0].push_back(FILE_PATH_LITERAL("pdf"));
 
   // Initializing last_saved_path_ if it is not already initialized.
   if (!last_saved_path_) {
     last_saved_path_ = new FilePath();
     // Allowing IO operation temporarily. It is ok to do so here because
     // the select file dialog performs IO anyway in order to display the
@@ skipping 10 matching lines @@
       string16(),
       last_saved_path_->Append(default_filename),
       &file_type_info,
       0,
       FILE_PATH_LITERAL(""),
       preview_tab(),
       platform_util::GetTopLevel(preview_tab()->GetNativeView()),
       NULL);
 }
 
+void PrintPreviewHandler::OnNavigation() {
+  TabContents* initiator_tab = GetInitiatorTab();
+  if (!initiator_tab)
+    return;
+
+  TabContentsWrapper* wrapper =
+      TabContentsWrapper::GetCurrentWrapperForContents(initiator_tab);
+  wrapper->print_view_manager()->set_observer(NULL);
+}
+
 void PrintPreviewHandler::FileSelected(const FilePath& path,
                                        int index, void* params) {
   PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(web_ui_);
   scoped_refptr<RefCountedBytes> data(new RefCountedBytes());
   print_preview_ui->GetPrintPreviewData(&data);
   if (!data->front()) {
     NOTREACHED();
     return;
   }
 
@@ skipping 17 matching lines @@
 void PrintPreviewHandler::HidePreviewTab() {
   TabContentsWrapper* preview_tab_wrapper =
       TabContentsWrapper::GetCurrentWrapperForContents(preview_tab());
   if (GetBackgroundPrintingManager()->HasTabContents(preview_tab_wrapper))
     return;
   GetBackgroundPrintingManager()->OwnTabContents(preview_tab_wrapper);
 }
 
 void PrintPreviewHandler::ClearInitiatorTabDetails() {
   TabContents* initiator_tab = GetInitiatorTab();
-  if (initiator_tab) {
-    // We no longer require the intiator tab details. Remove those details
-    // associated with the preview tab to allow the initiator tab to create
-    // another preview tab.
-    printing::PrintPreviewTabController* tab_controller =
-       printing::PrintPreviewTabController::GetInstance();
-    if (tab_controller)
-      tab_controller->EraseInitiatorTabInfo(preview_tab());
-  }
+  if (!initiator_tab)
+    return;
+
+  // We no longer require the initiator tab details. Remove those details
+  // associated with the preview tab to allow the initiator tab to create
+  // another preview tab.
+  printing::PrintPreviewTabController* tab_controller =
+     printing::PrintPreviewTabController::GetInstance();
+  if (tab_controller)
+    tab_controller->EraseInitiatorTabInfo(preview_tab());
 }