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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.
#ifndef CHROME_BROWSER_UI_GTK_G_OBJECT_WEAK_REF_H_
#define CHROME_BROWSER_UI_GTK_G_OBJECT_WEAK_REF_H_
#pragma once
#include <gtk/gtk.h>
#include "base/memory/ref_counted.h"
// GObjectWeakRef is like base::WeakRef, but for GLib objects. It can be useful
// when passing GObject/GtkWidget arguments to closures (e.g. base::Bind()) that
// may not necessarily outlast the closure. It is not thread-safe. Use like so:
//
// void DelayedAction(const GObjectWeakRef& object) {
// if (!object.get()) return;
// GtkWidget* widget = GTK_WIDGET(object.get());
// // code using |widget|
// }
//
// GtkWidget* widget = ...;
// MessageLoop::current()->PostTask(
// FROM_HERE, base::Bind(&DelayedAction, GObjectWeakRef(widget)));
class GObjectWeakRef {
public:
// GObjectWeakRef is just a thin wrapper around GObjectWeakRefDelegate that
// can be copied and assigned, even though the delegate is reference counted.
explicit GObjectWeakRef(GObject* object);
explicit GObjectWeakRef(GtkWidget* widget);
GObjectWeakRef(const GObjectWeakRef& ref); // NOLINT: explicitly non-explicit
~GObjectWeakRef();
// Assignment operators for GObject, GtkWidget, and GObjectWeakRef.
GObjectWeakRef& operator=(GObject* object);
GObjectWeakRef& operator=(GtkWidget* widget);
GObjectWeakRef& operator=(const GObjectWeakRef& ref);
GObject* get() const;
private:
class GObjectWeakRefDelegate;
void reset(GObject* object);
scoped_refptr<GObjectWeakRefDelegate> ref_;
};
#endif // CHROME_BROWSER_UI_GTK_G_OBJECT_WEAK_REF_H_
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