| // Copyright 2017 The Chromium Authors |
| // 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 <utility> |
| |
| #include "base/functional/callback.h" |
| #include "ui/views/view.h" |
| |
| namespace views { |
| |
| ViewTracker::ViewTracker(View* view) { |
| SetView(view); |
| } |
| |
| ViewTracker::~ViewTracker() = default; |
| |
| void ViewTracker::SetView(View* view) { |
| if (view == view_) |
| return; |
| |
| observation_.Reset(); |
| view_ = view; |
| if (view_) |
| observation_.Observe(view_.get()); |
| } |
| |
| void ViewTracker::SetIsDeletingCallback( |
| base::OnceClosure is_deleting_callback) { |
| is_deleting_callback_ = std::move(is_deleting_callback); |
| } |
| |
| void ViewTracker::OnViewIsDeleting(View* observed_view) { |
| if (track_entire_view_hierarchy_) { |
| return; |
| } |
| HandleViewDestruction(); |
| } |
| |
| void ViewTracker::OnViewHierarchyWillBeDeleted(View* observed_view) { |
| if (!track_entire_view_hierarchy_) { |
| return; |
| } |
| HandleViewDestruction(); |
| } |
| |
| void ViewTracker::HandleViewDestruction() { |
| // View is already in destructor. Set to nullptr first before running any |
| // callbacks. |
| SetView(nullptr); |
| if (is_deleting_callback_.is_null()) { |
| return; |
| } |
| std::move(is_deleting_callback_).Run(); |
| } |
| |
| } // namespace views |