75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_REGISTRAR_H_
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#define CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_REGISTRAR_H_
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#include <glib.h>
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#include <map>
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#include <vector>
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#include "base/basictypes.h"
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typedef void (*GCallback) (void);
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typedef struct _GObject GObject;
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typedef struct _GtkWidget GtkWidget;
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namespace libgtk2ui {
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// A class that ensures that callbacks don't run on stale owner objects. Similar
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// in spirit to NotificationRegistrar. Use as follows:
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//
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// class ChromeObject {
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// public:
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// ChromeObject() {
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// ...
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//
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// signals_.Connect(widget, "event", CallbackThunk, this);
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// }
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//
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// ...
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//
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// private:
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// Gtk2SignalRegistrar signals_;
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// };
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//
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// When |signals_| goes down, it will disconnect the handlers connected via
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// Connect.
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class Gtk2SignalRegistrar {
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public:
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Gtk2SignalRegistrar();
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~Gtk2SignalRegistrar();
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// Connect before the default handler. Returns the handler id.
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glong Connect(gpointer instance, const gchar* detailed_signal,
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GCallback signal_handler, gpointer data);
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// Connect after the default handler. Returns the handler id.
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glong ConnectAfter(gpointer instance, const gchar* detailed_signal,
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GCallback signal_handler, gpointer data);
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// Disconnects all signal handlers connected to |instance|.
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void DisconnectAll(gpointer instance);
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private:
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typedef std::vector<glong> HandlerList;
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typedef std::map<GObject*, HandlerList> HandlerMap;
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static void WeakNotifyThunk(gpointer data, GObject* where_the_object_was) {
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reinterpret_cast<Gtk2SignalRegistrar*>(data)->WeakNotify(
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where_the_object_was);
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}
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void WeakNotify(GObject* where_the_object_was);
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glong ConnectInternal(gpointer instance, const gchar* detailed_signal,
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GCallback signal_handler, gpointer data, bool after);
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HandlerMap handler_lists_;
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DISALLOW_COPY_AND_ASSIGN(Gtk2SignalRegistrar);
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};
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} // namespace libgtk2ui
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#endif // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_REGISTRAR_H_
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