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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ui/views/focus/external_focus_tracker.h"
      6 
      7 #include "base/logging.h"
      8 #include "ui/views/focus/view_storage.h"
      9 #include "ui/views/view.h"
     10 
     11 namespace views {
     12 
     13 ExternalFocusTracker::ExternalFocusTracker(View* parent_view,
     14                                            FocusManager* focus_manager)
     15     : focus_manager_(focus_manager),
     16       parent_view_(parent_view) {
     17   DCHECK(parent_view);
     18   view_storage_ = ViewStorage::GetInstance();
     19   last_focused_view_storage_id_ = view_storage_->CreateStorageID();
     20   // Store the view which is focused when we're created.
     21   if (focus_manager_)
     22     StartTracking();
     23 }
     24 
     25 ExternalFocusTracker::~ExternalFocusTracker() {
     26   view_storage_->RemoveView(last_focused_view_storage_id_);
     27   if (focus_manager_)
     28     focus_manager_->RemoveFocusChangeListener(this);
     29 }
     30 
     31 void ExternalFocusTracker::OnWillChangeFocus(View* focused_before,
     32                                              View* focused_now) {
     33   if (focused_now && !parent_view_->Contains(focused_now) &&
     34       parent_view_ != focused_now) {
     35     // Store the newly focused view.
     36     StoreLastFocusedView(focused_now);
     37   }
     38 }
     39 
     40 void ExternalFocusTracker::OnDidChangeFocus(View* focused_before,
     41                                             View* focused_now) {
     42 }
     43 
     44 void ExternalFocusTracker::FocusLastFocusedExternalView() {
     45   View* last_focused_view =
     46       view_storage_->RetrieveView(last_focused_view_storage_id_);
     47   if (last_focused_view)
     48     last_focused_view->RequestFocus();
     49 }
     50 
     51 void ExternalFocusTracker::SetFocusManager(FocusManager* focus_manager) {
     52   if (focus_manager_)
     53     focus_manager_->RemoveFocusChangeListener(this);
     54   focus_manager_ = focus_manager;
     55   if (focus_manager_)
     56     StartTracking();
     57 }
     58 
     59 void ExternalFocusTracker::StoreLastFocusedView(View* view) {
     60   view_storage_->RemoveView(last_focused_view_storage_id_);
     61   // If the view is NULL, remove the last focused view from storage, but don't
     62   // try to store NULL.
     63   if (view != NULL)
     64     view_storage_->StoreView(last_focused_view_storage_id_, view);
     65 }
     66 
     67 void ExternalFocusTracker::StartTracking() {
     68   StoreLastFocusedView(focus_manager_->GetFocusedView());
     69   focus_manager_->AddFocusChangeListener(this);
     70 }
     71 
     72 }  // namespace views
     73