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external_focus_tracker.cc
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external_focus_tracker.cc
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// 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 "ui/views/focus/external_focus_tracker.h"
#include <memory>
#include "base/check.h"
#include "ui/views/view.h"
#include "ui/views/view_tracker.h"
namespace views {
ExternalFocusTracker::ExternalFocusTracker(View* parent_view,
FocusManager* focus_manager)
: focus_manager_(focus_manager),
parent_view_(parent_view),
last_focused_view_tracker_(std::make_unique<ViewTracker>()) {
DCHECK(parent_view);
// Store the view which is focused when we're created.
if (focus_manager_)
StartTracking();
}
ExternalFocusTracker::~ExternalFocusTracker() {
if (focus_manager_)
focus_manager_->RemoveFocusChangeListener(this);
}
void ExternalFocusTracker::OnWillChangeFocus(View* focused_before,
View* focused_now) {
if (focused_now && !parent_view_->Contains(focused_now) &&
parent_view_ != focused_now) {
// Store the newly focused view.
StoreLastFocusedView(focused_now);
}
}
void ExternalFocusTracker::OnDidChangeFocus(View* focused_before,
View* focused_now) {}
void ExternalFocusTracker::FocusLastFocusedExternalView() {
View* last_focused_view = last_focused_view_tracker_->view();
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) {
last_focused_view_tracker_->SetView(view);
}
void ExternalFocusTracker::StartTracking() {
View* current_focused_view = focus_manager_->GetFocusedView();
// During focus restore events, it's possible for focus to already be within
// the parent_view_.
if (!parent_view_->Contains(current_focused_view))
StoreLastFocusedView(current_focused_view);
focus_manager_->AddFocusChangeListener(this);
}
} // namespace views