ui/views/focus/external_focus_tracker.cc

   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