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

chrome/browser/printing/print_view_manager.cc

Index: chrome/browser/printing/print_view_manager.cc
diff --git a/chrome/browser/printing/print_view_manager.cc b/chrome/browser/printing/print_view_manager.cc
index 65b63f0e4e34ab0989f4ed0b11a03b234e9b57ad..f8546b9be3d4d80f7719d4a1752bea11a9724b7a 100644
--- a/chrome/browser/printing/print_view_manager.cc
+++ b/chrome/browser/printing/print_view_manager.cc
@@ -11,6 +11,7 @@
 #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_delegate.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"
@@ -47,7 +48,8 @@ PrintViewManager::PrintViewManager(TabContentsWrapper* tab)
       number_pages_(0),
       printing_succeeded_(false),
       inside_inner_message_loop_(false),
-      is_title_overridden_(false) {
+      is_title_overridden_(false),
+      delegate_(NULL) {
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
   expecting_first_page_ = true;
 #endif
@@ -57,7 +59,9 @@ PrintViewManager::~PrintViewManager() {
   DisconnectFromCurrentPrintJob();
 }
 
-bool PrintViewManager::PrintNow() {
+bool PrintViewManager::PrintNow(PrintViewManagerDelegate* delegate) {
+  delegate_ = delegate;
+
   // Don't print interstitials.
   if (tab_contents()->showing_interstitial_page())
     return false;
@@ -123,6 +127,11 @@ void PrintViewManager::OnDidGetPrintedPagesCount(int cookie, int number_pages) {
   OpportunisticallyCreatePrintJob(cookie);
 }
 
+void PrintViewManager::OnDidShowPrintDialog() {
+  if (delegate_)
+    delegate_->OnPrintDialogShown();
+}
+
 void PrintViewManager::OnDidPrintPage(
     const PrintHostMsg_DidPrintPage_Params& params) {
   if (!OpportunisticallyCreatePrintJob(params.document_cookie))
@@ -205,6 +214,7 @@ bool PrintViewManager::OnMessageReceived(const IPC::Message& message) {
   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)
@@ -384,6 +394,8 @@ void PrintViewManager::TerminatePrintJob(bool cancel) {
   if (!print_job_.get())
     return;
 
+  delegate_ = NULL;
+
   if (cancel) {
     // We don't need the metafile data anymore because the printing is canceled.
     print_job_->Cancel();