Print Preview: Hold on to tabs that do window.print(); window.close() until print preview finishes.

chrome/browser/printing/background_printing_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/background_printing_manager.h"
 
 #include "chrome/browser/printing/print_job.h"
 #include "chrome/browser/printing/print_preview_tab_controller.h"
 #include "chrome/browser/sessions/restore_tab_helper.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/browser/browser_thread.h"
+#include "content/browser/renderer_host/render_view_host.h"
 #include "content/common/notification_details.h"
 #include "content/common/notification_source.h"
 
 namespace printing {
 
 BackgroundPrintingManager::BackgroundPrintingManager() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
 BackgroundPrintingManager::~BackgroundPrintingManager() {
   DCHECK(CalledOnValidThread());
   // The might be some TabContentsWrappers still in |printing_tabs_| at
   // this point. E.g. when the last remaining tab is a print preview tab and
   // tries to print. In which case it will fail to print.
   // TODO(thestig) handle this case better.
 }
 
 void BackgroundPrintingManager::OwnPrintPreviewTab(
     TabContentsWrapper* preview_tab) {
   DCHECK(CalledOnValidThread());
   DCHECK(PrintPreviewTabController::IsPrintPreviewTab(preview_tab));
   CHECK(printing_tabs_.find(preview_tab) == printing_tabs_.end());
 
   printing_tabs_.insert(preview_tab);
 
   registrar_.Add(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
                  Source<TabContentsWrapper>(preview_tab));
-  registrar_.Add(this, content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
-                 Source<TabContents>(preview_tab->tab_contents()));
 
-  // Detach |preview_tab| from its tab strip.
-  Browser* browser = BrowserList::FindBrowserWithID(
-      preview_tab->restore_tab_helper()->window_id().id());
-  DCHECK(browser);
+  // OwnInitiatorTabContents() may have already added this notification.
+  TabContents* preview_contents = preview_tab->tab_contents();
+  if (!registrar_.IsRegistered(this,
+                               content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
+                               Source<TabContents>(preview_contents))) {
+    registrar_.Add(this, content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
+                   Source<TabContents>(preview_contents));
+  }
 
-  TabStripModel* tabstrip = browser->tabstrip_model();
-  tabstrip->DetachTabContentsAt(tabstrip->GetIndexOfTabContents(preview_tab));
+  // If a tab that is printing crashes, the user cannot destroy it since it is
+  // not in any tab strip. Thus listen for crashes here and delete the tab.
+  //
+  // Multiple sites may share the same RenderProcessHost, so check if this
+  // notification has already been added.
+  RenderProcessHost* rph = preview_tab->render_view_host()->process();
+  if (!registrar_.IsRegistered(this,
+                               content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
+                               Source<RenderProcessHost>(rph))) {
+    registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
+                   Source<RenderProcessHost>(rph));
+  }
+
+  RemoveFromTabStrip(preview_tab);
 
   // Activate the initiator tab.
   PrintPreviewTabController* tab_controller =
       PrintPreviewTabController::GetInstance();
   if (!tab_controller)
     return;
   TabContentsWrapper* initiator_tab =
       tab_controller->GetInitiatorTab(preview_tab);
   if (!initiator_tab)
     return;
   static_cast<RenderViewHostDelegate*>(
       initiator_tab->tab_contents())->Activate();
 }
 
+bool BackgroundPrintingManager::OwnInitiatorTab(
+    TabContentsWrapper* initiator_tab) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(!PrintPreviewTabController::IsPrintPreviewTab(initiator_tab));
+  CHECK(initiator_tabs_.find(initiator_tab) == initiator_tabs_.end());
+
+  PrintPreviewTabController* tab_controller =
+      PrintPreviewTabController::GetInstance();
+  if (!tab_controller)
+    return false;
+  TabContentsWrapper* preview_tab =
+      tab_controller->GetPrintPreviewForTab(initiator_tab);
+  if (!preview_tab)
+    return false;
+
+  initiator_tabs_.insert(initiator_tab);
+  map_[preview_tab] = initiator_tab;
+
+  // OwnPrintPreviewTab() may have already added this notification.
+  TabContents* preview_contents = preview_tab->tab_contents();
+  if (!registrar_.IsRegistered(this,
+                               content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
+                               Source<TabContents>(preview_contents))) {
+    registrar_.Add(this, content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
+                   Source<TabContents>(preview_contents));
+  }
+
+  RemoveFromTabStrip(initiator_tab);
+  return true;
+}
+
 void BackgroundPrintingManager::Observe(int type,
                                         const NotificationSource& source,
                                         const NotificationDetails& details) {
   switch (type) {
+    case content::NOTIFICATION_RENDERER_PROCESS_CLOSED: {
+      OnRendererProcessClosed(Source<RenderProcessHost>(source).ptr());
+      break;
+    }
     case chrome::NOTIFICATION_PRINT_JOB_RELEASED: {
-      TabContentsWrapper* tab = Source<TabContentsWrapper>(source).ptr();
-      registrar_.Remove(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
-                        Source<TabContentsWrapper>(tab));
-
-      // This might be happening in the middle of a RenderViewGone() loop.
-      // Deleting |contents| later so the RenderViewGone() loop can finish.
-      MessageLoop::current()->DeleteSoon(FROM_HERE, tab);
+      OnPrintJobReleased(Source<TabContentsWrapper>(source).ptr());
       break;
     }
     case content::NOTIFICATION_TAB_CONTENTS_DESTROYED: {
-      TabContentsWrapper* tab =
+      OnTabContentsDestroyed(
           TabContentsWrapper::GetCurrentWrapperForContents(
-              Source<TabContents>(source).ptr());
-      if (registrar_.IsRegistered(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
-                                  Source<TabContentsWrapper>(tab))) {
-        registrar_.Remove(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
-                          Source<TabContentsWrapper>(tab));
-      }
-      registrar_.Remove(this, content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
-                        Source<TabContents>(tab->tab_contents()));
-      printing_tabs_.erase(tab);
+              Source<TabContents>(source).ptr()));
       break;
     }
     default: {
       NOTREACHED();
       break;
     }
   }
 }
 
+void BackgroundPrintingManager::OnRendererProcessClosed(
+    RenderProcessHost* rph) {
+  TabContentsWrapperSet::const_iterator it;
+  for (it = begin(); it != end(); ++it) {
+    TabContentsWrapper* tab = *it;
+    if (tab->render_view_host()->process() == rph)
+      MessageLoop::current()->DeleteSoon(FROM_HERE, tab);

[kmadhusu, 2011/09/07 23:21:10]

When exactly multiple preview tabs share the same render_view_host?

[Lei Zhang, 2011/09/07 23:41:16]

This happens quite often. For example, open two tabs to google.com and print
from both. There's a good change both print preview tabs will be the same
process.

+  }
+}
+
+void BackgroundPrintingManager::OnPrintJobReleased(
+    TabContentsWrapper* preview_tab) {
+  registrar_.Remove(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
+                    Source<TabContentsWrapper>(preview_tab));
+
+  // This might be happening in the middle of a RenderViewGone() loop.
+  // Deleting |contents| later so the RenderViewGone() loop can finish.
+  MessageLoop::current()->DeleteSoon(FROM_HERE, preview_tab);
+}
+
+void BackgroundPrintingManager::OnTabContentsDestroyed(
+    TabContentsWrapper* preview_tab) {
+  bool is_owned_printing_tab =
+      (printing_tabs_.find(preview_tab) != printing_tabs_.end());

[kmadhusu, 2011/09/07 23:21:10]

= HasPrintPreviewTab(preview_tab);

[Lei Zhang, 2011/09/07 23:41:16]

Done.

+  bool is_preview_tab_for_owned_initator_tab =
+      (map_.find(preview_tab) != map_.end());
+  DCHECK(is_owned_printing_tab || is_preview_tab_for_owned_initator_tab);
+
+  // Always need to remove this notification since the tab is gone.
+  registrar_.Remove(this, content::NOTIFICATION_TAB_CONTENTS_DESTROYED,
+                    Source<TabContents>(preview_tab->tab_contents()));
+
+  // Delete the associated initiator tab if one exists.
+  if (is_preview_tab_for_owned_initator_tab) {
+    TabContentsWrapper* initiator_tab = map_[preview_tab];
+    initiator_tabs_.erase(initiator_tab);
+    MessageLoop::current()->DeleteSoon(FROM_HERE, initiator_tab);
+  }
+
+  // If |preview_tab| is not owned, then we are done.
+  if (!is_owned_printing_tab)
+    return;
+
+  // Remove NOTIFICATION_RENDERER_PROCESS_CLOSED if |tab| is the last
+  // TabContents associated with |rph|.
+  bool shared_rph = false;
+  RenderProcessHost* rph = preview_tab->render_view_host()->process();
+  TabContentsWrapperSet::const_iterator it;
+  for (it = begin(); it != end(); ++it) {
+    TabContentsWrapper* iter_tab = *it;
+    if (iter_tab == preview_tab)
+      continue;
+    if (iter_tab->render_view_host()->process() == rph) {
+      shared_rph = true;
+      break;
+    }
+  }
+  if (!shared_rph) {
+    registrar_.Remove(this, content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
+                      Source<RenderProcessHost>(rph));
+  }
+
+  // Remove other notifications and remove the tab from |printing_tabs_|.
+  if (registrar_.IsRegistered(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
+                              Source<TabContentsWrapper>(preview_tab))) {
+    registrar_.Remove(this, chrome::NOTIFICATION_PRINT_JOB_RELEASED,
+                      Source<TabContentsWrapper>(preview_tab));
+  }
+  printing_tabs_.erase(preview_tab);
+}
+
+void BackgroundPrintingManager::RemoveFromTabStrip(TabContentsWrapper* tab) {
+  Browser* browser = BrowserList::FindBrowserWithID(
+      tab->restore_tab_helper()->window_id().id());
+  DCHECK(browser);
+
+  TabStripModel* tabstrip = browser->tabstrip_model();
+  int index = tabstrip->GetIndexOfTabContents(tab);
+  if (index == TabStripModel::kNoTab)
+    return;
+  tabstrip->DetachTabContentsAt(index);
+}
+
 BackgroundPrintingManager::TabContentsWrapperSet::const_iterator
     BackgroundPrintingManager::begin() {
   return printing_tabs_.begin();
 }
 
 BackgroundPrintingManager::TabContentsWrapperSet::const_iterator
     BackgroundPrintingManager::end() {
   return printing_tabs_.end();
 }
 
 bool BackgroundPrintingManager::HasPrintPreviewTab(
     TabContentsWrapper* preview_tab) {
   return printing_tabs_.find(preview_tab) != printing_tabs_.end();
 }
 
 }  // namespace printing