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// 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
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