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// Copyright 2020 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/widget/unique_widget_ptr.h"
#include <utility>
#include "base/scoped_observer.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_observer.h"
namespace views {
namespace {
struct WidgetAutoCloser {
void operator()(Widget* widget) {
widget->CloseWithReason(Widget::ClosedReason::kUnspecified);
}
};
using WidgetAutoClosePtr = std::unique_ptr<Widget, WidgetAutoCloser>;
} // namespace
class UniqueWidgetPtr::UniqueWidgetPtrImpl : public WidgetObserver {
public:
UniqueWidgetPtrImpl() = default;
// This class acts like unique_ptr<Widget>, so this constructor is
// deliberately implicit.
UniqueWidgetPtrImpl(std::unique_ptr<Widget> widget) // NOLINT
: widget_closer_(widget.release()) {
widget_observer_.Add(widget_closer_.get());
}
UniqueWidgetPtrImpl(const UniqueWidgetPtrImpl&) = delete;
UniqueWidgetPtrImpl& operator=(const UniqueWidgetPtrImpl&) = delete;
~UniqueWidgetPtrImpl() override = default;
Widget* Get() const { return widget_closer_.get(); }
void Reset() {
if (!widget_closer_)
return;
widget_observer_.RemoveAll();
widget_closer_.reset();
}
// WidgetObserver overrides.
void OnWidgetDestroying(Widget* widget) override {
DCHECK_EQ(widget, widget_closer_.get());
widget_observer_.RemoveAll();
widget_closer_.release();
}
private:
ScopedObserver<Widget, WidgetObserver> widget_observer_{this};
WidgetAutoClosePtr widget_closer_;
};
UniqueWidgetPtr::UniqueWidgetPtr() = default;
UniqueWidgetPtr::UniqueWidgetPtr(std::unique_ptr<Widget> widget)
: unique_widget_ptr_impl_(
std::make_unique<UniqueWidgetPtrImpl>(std::move(widget))) {}
UniqueWidgetPtr::UniqueWidgetPtr(UniqueWidgetPtr&& other) = default;
UniqueWidgetPtr& UniqueWidgetPtr::operator=(UniqueWidgetPtr&& other) = default;
UniqueWidgetPtr::~UniqueWidgetPtr() = default;
UniqueWidgetPtr::operator bool() const {
return !!get();
}
Widget& UniqueWidgetPtr::operator*() const {
return *get();
}
Widget* UniqueWidgetPtr::operator->() const {
return get();
}
void UniqueWidgetPtr::reset() {
unique_widget_ptr_impl_.reset();
}
Widget* UniqueWidgetPtr::get() const {
return unique_widget_ptr_impl_ ? unique_widget_ptr_impl_->Get() : nullptr;
}
} // namespace views
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