Move Sad Tab implementation out of the TabContentsViews.

chrome/browser/ui/sad_tab_observer.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/sad_tab_observer.h"
+
+#include "chrome/browser/browser_shutdown.h"
+#include "content/browser/tab_contents/tab_contents.h"
+#include "content/browser/tab_contents/tab_contents_view.h"
+#include "content/public/browser/notification_source.h"
+#include "content/public/browser/notification_types.h"
+
+#if defined(OS_MACOSX)
+#include "chrome/browser/ui/cocoa/tab_contents/sad_tab_controller.h"
+#elif defined(TOOLKIT_VIEWS)
+#include "chrome/browser/ui/views/sad_tab_view.h"
+#include "chrome/browser/ui/views/tab_contents/tab_contents_view_views.h"
+#elif defined(TOOLKIT_GTK)
+#include "chrome/browser/ui/gtk/sad_tab_gtk.h"
+#endif
+
+SadTabObserver::SadTabObserver(TabContents* tab_contents)
+    : TabContentsObserver(tab_contents) {
+  registrar_.Add(this, content::NOTIFICATION_TAB_CONTENTS_CONNECTED,
+                 content::Source<TabContents>(tab_contents));
+}
+
+SadTabObserver::~SadTabObserver() {
+}
+
+void SadTabObserver::RenderViewGone(base::TerminationStatus status) {
+  // Only show the sad tab if we're not in browser shutdown, so that TabContents
+  // objects that are not in a browser (e.g., HTML dialogs) and thus are
+  // visible do not flash a sad tab page.
+  if (browser_shutdown::GetShutdownType() != browser_shutdown::NOT_VALID)
+    return;
+
+  if (HasSadTab())
+    return;
+
+  gfx::NativeView view = AcquireSadTab(status);
+  tab_contents()->view()->InstallOverlayView(view);
+}
+
+void SadTabObserver::Observe(int type,
+                             const content::NotificationSource& source,
+                             const content::NotificationDetails& details) {
+  switch (type) {
+    case content::NOTIFICATION_TAB_CONTENTS_CONNECTED:
+      if (HasSadTab()) {
+        tab_contents()->view()->RemoveOverlayView();
+        ReleaseSadTab();
+      }
+      break;
+
+    default:
+      NOTREACHED() << "Got a notification we didn't register for.";
+  }
+}
+
+gfx::NativeView SadTabObserver::AcquireSadTab(base::TerminationStatus status) {
+#if defined(OS_MACOSX)
+  sad_tab_.reset(
+      sad_tab_controller_mac::CreateSadTabController(tab_contents()));
+  return sad_tab_controller_mac::GetViewOfSadTabController(sad_tab_.get());
+#elif defined(TOOLKIT_VIEWS)
+  SadTabView::Kind kind =
+      status == base::TERMINATION_STATUS_PROCESS_WAS_KILLED ?
+      SadTabView::KILLED : SadTabView::CRASHED;
+  views::Widget::InitParams sad_tab_params(
+      views::Widget::InitParams::TYPE_CONTROL);
+  // It is not possible to create a widget that has no parent, and later
+  // re-parent it. TODO(avi): This is a cheat. Can this be made cleaner?
+  sad_tab_params.parent_widget =
+      static_cast<TabContentsViewViews*>(tab_contents()->view());
+  sad_tab_params.ownership =
+      views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
+  sad_tab_.reset(new views::Widget);
+  sad_tab_->Init(sad_tab_params);
+  sad_tab_->SetContentsView(new SadTabView(tab_contents(), kind));
+  return sad_tab_->GetNativeView();
+#elif defined(TOOLKIT_GTK)
+gfx::NativeView SadTabObserver::AcquireSadTab(base::TerminationStatus status) {
+  sad_tab_.reset(new SadTabGtk(
+      tab_contents(),
+      status == base::TERMINATION_STATUS_PROCESS_WAS_KILLED
+          ? SadTabGtk::KILLED
+          : SadTabGtk::CRASHED));
+  return sad_tab_->widget();
+#else
+#error Unknown platform
+#endif
+}
+
+void SadTabObserver::ReleaseSadTab() {
+  sad_tab_.reset();
+}
+
+bool SadTabObserver::HasSadTab() {
+  return sad_tab_.get() != NULL;
+}