| // Copyright 2017 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/view_tracker.h" |
| |
| #include "ui/views/view.h" |
| |
| namespace views { |
| |
| ViewTracker::ViewTracker(View* view) : view_(nullptr) { |
| SetView(view); |
| } |
| |
| ViewTracker::~ViewTracker() { |
| SetView(nullptr); |
| } |
| |
| void ViewTracker::SetView(View* view) { |
| if (view == view_) |
| return; |
| |
| if (view_) |
| view_->RemoveObserver(this); |
| view_ = view; |
| if (view_) |
| view_->AddObserver(this); |
| } |
| |
| void ViewTracker::OnViewIsDeleting(View* observed_view) { |
| SetView(nullptr); |
| } |
| |
| } // namespace views |
