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

chrome/browser/printing/print_view_manager.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/printing/print_view_manager.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/printing/print_job.h"
 #include "chrome/browser/printing/print_job_manager.h"
 #include "chrome/browser/printing/print_preview_tab_controller.h"
 #include "chrome/browser/printing/printer_query.h"
+#include "chrome/browser/printing/print_view_manager_observer.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/webui/print_preview_ui.h"
 #include "chrome/common/print_messages.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/tab_contents/navigation_entry.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/common/notification_details.h"
 #include "content/common/notification_service.h"
 #include "content/common/notification_source.h"
 #include "grit/generated_resources.h"
@@ skipping 16 matching lines @@
 }  // namespace
 
 namespace printing {
 
 PrintViewManager::PrintViewManager(TabContentsWrapper* tab)
     : TabContentsObserver(tab->tab_contents()),
       tab_(tab),
       number_pages_(0),
       printing_succeeded_(false),
       inside_inner_message_loop_(false),
-      is_title_overridden_(false) {
+      is_title_overridden_(false),
+      observer_(NULL) {
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
   expecting_first_page_ = true;
 #endif
 }
 
 PrintViewManager::~PrintViewManager() {
   DisconnectFromCurrentPrintJob();
 }
 
 bool PrintViewManager::PrintNow() {
@@ skipping 12 matching lines @@
   return Send(new PrintMsg_InitiatePrintPreview(routing_id()));
 }
 
 void PrintViewManager::PreviewPrintingRequestCancelled() {
   if (!tab_contents())
     return;
   RenderViewHost* rvh = tab_contents()->render_view_host();
   rvh->Send(new PrintMsg_PreviewPrintingRequestCancelled(rvh->routing_id()));
 }
 
+void PrintViewManager::set_observer(PrintViewManagerObserver* observer) {
+  DCHECK(!observer || !observer_);
+  observer_ = observer;
+}
+
 void PrintViewManager::StopNavigation() {
   // Cancel the current job, wait for the worker to finish.
   TerminatePrintJob(true);
 }
 
 void PrintViewManager::RenderViewGone() {
   if (!print_job_.get())
     return;
 
   scoped_refptr<PrintedDocument> document(print_job_->document());
@@ skipping 23 matching lines @@
   return GURL();
 }
 
 void PrintViewManager::OnDidGetPrintedPagesCount(int cookie, int number_pages) {
   DCHECK_GT(cookie, 0);
   DCHECK_GT(number_pages, 0);
   number_pages_ = number_pages;
   OpportunisticallyCreatePrintJob(cookie);
 }
 
+void PrintViewManager::OnDidShowPrintDialog() {
+  if (observer_)
+    observer_->OnPrintDialogShown();
+}
+
 void PrintViewManager::OnDidPrintPage(
     const PrintHostMsg_DidPrintPage_Params& params) {
   if (!OpportunisticallyCreatePrintJob(params.document_cookie))
     return;
 
   PrintedDocument* document = print_job_->document();
   if (!document || params.document_cookie != document->cookie()) {
     // Out of sync. It may happen since we are completely asynchronous. Old
     // spurious messages can be received if one of the processes is overloaded.
     return;
@@ skipping 62 matching lines @@
       NotificationType::PRINT_JOB_RELEASED,
       Source<TabContents>(tab_contents()),
       NotificationService::NoDetails());
 }
 
 bool PrintViewManager::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PrintViewManager, message)
     IPC_MESSAGE_HANDLER(PrintHostMsg_DidGetPrintedPagesCount,
                         OnDidGetPrintedPagesCount)
+    IPC_MESSAGE_HANDLER(PrintHostMsg_DidShowPrintDialog, OnDidShowPrintDialog)
     IPC_MESSAGE_HANDLER(PrintHostMsg_DidPrintPage, OnDidPrintPage)
     IPC_MESSAGE_HANDLER(PrintHostMsg_PrintingFailed, OnPrintingFailed)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void PrintViewManager::Observe(NotificationType type,
                                const NotificationSource& source,
                                const NotificationDetails& details) {
@@ skipping 255 matching lines @@
     return false;
   }
 
   // Settings are already loaded. Go ahead. This will set
   // print_job_->is_job_pending() to true.
   print_job_->StartPrinting();
   return true;
 }
 
 }  // namespace printing