1 files changed, 65 insertions, 0 deletions
diff --git a/chrome/views/focus/external_focus_tracker.cc b/chrome/views/focus/external_focus_tracker.cc
new file mode 100644
index 0000000..89ea93e
--- /dev/null
+++ b/chrome/views/focus/external_focus_tracker.cc
@@ -0,0 +1,65 @@
+// Copyright (c) 2006-2008 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/views/focus/external_focus_tracker.h"
+
+#include "chrome/views/view.h"
+#include "chrome/views/focus/view_storage.h"
+
+namespace views {
+
+ExternalFocusTracker::ExternalFocusTracker(View* parent_view,
+                                           FocusManager* focus_manager)
+    : focus_manager_(focus_manager),
+      parent_view_(parent_view) {
+  view_storage_ = ViewStorage::GetSharedInstance();
+  last_focused_view_storage_id_ = view_storage_->CreateStorageID();
+  // Store the view which is focused when we're created.
+  StartTracking();
+}
+
+ExternalFocusTracker::~ExternalFocusTracker() {
+  view_storage_->RemoveView(last_focused_view_storage_id_);
+  if (focus_manager_)
+    focus_manager_->RemoveFocusChangeListener(this);
+}
+
+void ExternalFocusTracker::FocusWillChange(View* focused_before,
+                                           View* focused_now) {
+  if (focused_now && !parent_view_->IsParentOf(focused_now) &&
+      parent_view_ != focused_now) {
+    // Store the newly focused view.
+    StoreLastFocusedView(focused_now);
+  }
+}
+
+void ExternalFocusTracker::FocusLastFocusedExternalView() {
+  View* last_focused_view =
+      view_storage_->RetrieveView(last_focused_view_storage_id_);
+  if (last_focused_view)
+    last_focused_view->RequestFocus();
+}
+
+void ExternalFocusTracker::SetFocusManager(FocusManager* focus_manager) {
+  if (focus_manager_)
+    focus_manager_->RemoveFocusChangeListener(this);
+  focus_manager_ = focus_manager;
+  if (focus_manager_)
+    StartTracking();
+}
+
+void ExternalFocusTracker::StoreLastFocusedView(View* view) {
+  view_storage_->RemoveView(last_focused_view_storage_id_);
+  // If the view is NULL, remove the last focused view from storage, but don't
+  // try to store NULL.
+  if (view != NULL)
+    view_storage_->StoreView(last_focused_view_storage_id_, view);
+}
+
+void ExternalFocusTracker::StartTracking() {
+  StoreLastFocusedView(focus_manager_->GetFocusedView());
+  focus_manager_->AddFocusChangeListener(this);
+}
+
+}  // namespace views