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
11namespace views {
12
13ExternalFocusTracker::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
25ExternalFocusTracker::~ExternalFocusTracker() {
26  view_storage_->RemoveView(last_focused_view_storage_id_);
27  if (focus_manager_)
28    focus_manager_->RemoveFocusChangeListener(this);
29}
30
31void 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
40void ExternalFocusTracker::OnDidChangeFocus(View* focused_before,
41                                            View* focused_now) {
42}
43
44void 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
51void 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
59void 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
67void ExternalFocusTracker::StartTracking() {
68  StoreLastFocusedView(focus_manager_->GetFocusedView());
69  focus_manager_->AddFocusChangeListener(this);
70}
71
72}  // namespace views
73