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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_LIBGTK2UI_GTK2_SIGNAL_REGISTRAR_H_
#define CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_REGISTRAR_H_
#include <glib.h>
#include <map>
#include <vector>
#include "base/basictypes.h"
typedef void (*GCallback) (void);
typedef struct _GObject GObject;
typedef struct _GtkWidget GtkWidget;
namespace libgtk2ui {
// A class that ensures that callbacks don't run on stale owner objects. Similar
// in spirit to NotificationRegistrar. Use as follows:
//
// class ChromeObject {
// public:
// ChromeObject() {
// ...
//
// signals_.Connect(widget, "event", CallbackThunk, this);
// }
//
// ...
//
// private:
// Gtk2SignalRegistrar signals_;
// };
//
// When |signals_| goes down, it will disconnect the handlers connected via
// Connect.
class Gtk2SignalRegistrar {
public:
Gtk2SignalRegistrar();
~Gtk2SignalRegistrar();
// Connect before the default handler. Returns the handler id.
glong Connect(gpointer instance, const gchar* detailed_signal,
GCallback signal_handler, gpointer data);
// Connect after the default handler. Returns the handler id.
glong ConnectAfter(gpointer instance, const gchar* detailed_signal,
GCallback signal_handler, gpointer data);
// Disconnects all signal handlers connected to |instance|.
void DisconnectAll(gpointer instance);
private:
typedef std::vector<glong> HandlerList;
typedef std::map<GObject*, HandlerList> HandlerMap;
static void WeakNotifyThunk(gpointer data, GObject* where_the_object_was) {
reinterpret_cast<Gtk2SignalRegistrar*>(data)->WeakNotify(
where_the_object_was);
}
void WeakNotify(GObject* where_the_object_was);
glong ConnectInternal(gpointer instance, const gchar* detailed_signal,
GCallback signal_handler, gpointer data, bool after);
HandlerMap handler_lists_;
DISALLOW_COPY_AND_ASSIGN(Gtk2SignalRegistrar);
};
} // namespace libgtk2ui
#endif // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_REGISTRAR_H_
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