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[evolution/express] Make EShell and related classes extensible.

commit c69a60e74cb70bca3aa198de5d7019ac36a94fbf
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sat Mar 20 00:00:28 2010 -0400

    Make EShell and related classes extensible.

 shell/e-shell-content.c   |   44 ++++++++------------------------
 shell/e-shell-searchbar.c |   42 +++++++------------------------
 shell/e-shell-sidebar.c   |   46 +++++++++-------------------------
 shell/e-shell-switcher.c  |   60 +++++++++++++-------------------------------
 shell/e-shell-taskbar.c   |   46 +++++++++-------------------------
 shell/e-shell-view.c      |   16 ++++++++++-
 shell/e-shell-window.c    |   43 ++++++++------------------------
 shell/e-shell.c           |   47 +++++++++-------------------------
 8 files changed, 101 insertions(+), 243 deletions(-)
---
diff --git a/shell/e-shell-content.c b/shell/e-shell-content.c
index e010290..af799ae 100644
--- a/shell/e-shell-content.c
+++ b/shell/e-shell-content.c
@@ -24,6 +24,7 @@
 #include <glib/gi18n.h>
 
 #include "e-util/e-binding.h"
+#include "e-util/e-extensible.h"
 #include "e-util/e-util.h"
 #include "e-util/e-alert-dialog.h"
 #include "filter/e-rule-editor.h"
@@ -54,7 +55,9 @@ enum {
 	PROP_SHELL_VIEW
 };
 
-static gpointer parent_class;
+G_DEFINE_TYPE_WITH_CODE (
+	EShellContent, e_shell_content, GTK_TYPE_BIN,
+	G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL));
 
 static void
 shell_content_dialog_rule_changed (GtkWidget *dialog,
@@ -131,7 +134,7 @@ shell_content_dispose (GObject *object)
 	}
 
 	/* Chain up to parent's dispose() method. */
-	G_OBJECT_CLASS (parent_class)->dispose (object);
+	G_OBJECT_CLASS (e_shell_content_parent_class)->dispose (object);
 }
 
 static void
@@ -166,6 +169,8 @@ shell_content_constructed (GObject *object)
 		shell_content->priv->searchbar = g_object_ref (widget);
 		gtk_widget_show (widget);
 	}
+
+	e_extensible_load_extensions (E_EXTENSIBLE (object));
 }
 
 static void
@@ -186,7 +191,7 @@ shell_content_destroy (GtkObject *gtk_object)
 	}
 
 	/* Chain up to parent's destroy() method. */
-	GTK_OBJECT_CLASS (parent_class)->destroy (gtk_object);
+	GTK_OBJECT_CLASS (e_shell_content_parent_class)->destroy (gtk_object);
 }
 
 static void
@@ -265,7 +270,7 @@ shell_content_forall (GtkContainer *container,
 		callback (priv->searchbar, callback_data);
 
 	/* Chain up to parent's forall() method. */
-	GTK_CONTAINER_CLASS (parent_class)->forall (
+	GTK_CONTAINER_CLASS (e_shell_content_parent_class)->forall (
 		container, include_internals, callback, callback_data);
 }
 
@@ -302,14 +307,13 @@ shell_content_construct_searchbar (EShellContent *shell_content)
 }
 
 static void
-shell_content_class_init (EShellContentClass *class)
+e_shell_content_class_init (EShellContentClass *class)
 {
 	GObjectClass *object_class;
 	GtkObjectClass *gtk_object_class;
 	GtkWidgetClass *widget_class;
 	GtkContainerClass *container_class;
 
-	parent_class = g_type_class_peek_parent (class);
 	g_type_class_add_private (class, sizeof (EShellContentPrivate));
 
 	object_class = G_OBJECT_CLASS (class);
@@ -349,39 +353,13 @@ shell_content_class_init (EShellContentClass *class)
 }
 
 static void
-shell_content_init (EShellContent *shell_content)
+e_shell_content_init (EShellContent *shell_content)
 {
 	shell_content->priv = E_SHELL_CONTENT_GET_PRIVATE (shell_content);
 
 	GTK_WIDGET_SET_FLAGS (shell_content, GTK_NO_WINDOW);
 }
 
-GType
-e_shell_content_get_type (void)
-{
-	static GType type = 0;
-
-	if (G_UNLIKELY (type == 0)) {
-		static const GTypeInfo type_info = {
-			sizeof (EShellContentClass),
-			(GBaseInitFunc) NULL,
-			(GBaseFinalizeFunc) NULL,
-			(GClassInitFunc) shell_content_class_init,
-			(GClassFinalizeFunc) NULL,
-			NULL,  /* class_data */
-			sizeof (EShellContent),
-			0,     /* n_preallocs */
-			(GInstanceInitFunc) shell_content_init,
-			NULL   /* value_table */
-		};
-
-		type = g_type_register_static (
-			GTK_TYPE_BIN, "EShellContent", &type_info, 0);
-	}
-
-	return type;
-}
-
 /**
  * e_shell_content_new:
  * @shell_view: an #EShellView
diff --git a/shell/e-shell-searchbar.c b/shell/e-shell-searchbar.c
index 272ba0e..4b2c2c8 100644
--- a/shell/e-shell-searchbar.c
+++ b/shell/e-shell-searchbar.c
@@ -26,6 +26,7 @@
 
 #include "e-util/e-util.h"
 #include "e-util/e-binding.h"
+#include "e-util/e-extensible.h"
 #include "widgets/misc/e-action-combo-box.h"
 #include "widgets/misc/e-hinted-entry.h"
 
@@ -82,7 +83,9 @@ enum {
 	PROP_STATE_GROUP
 };
 
-static gpointer parent_class;
+G_DEFINE_TYPE_WITH_CODE (
+	EShellSearchbar, e_shell_searchbar, GTK_TYPE_BOX,
+	G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL))
 
 static void
 shell_searchbar_save_search_filter (EShellSearchbar *searchbar)
@@ -620,7 +623,7 @@ shell_searchbar_dispose (GObject *object)
 	}
 
 	/* Chain up to parent's dispose() method. */
-	G_OBJECT_CLASS (parent_class)->dispose (object);
+	G_OBJECT_CLASS (e_shell_searchbar_parent_class)->dispose (object);
 }
 
 static void
@@ -693,13 +696,15 @@ shell_searchbar_constructed (GObject *object)
 
 	widget = GTK_WIDGET (searchbar);
 	gtk_size_group_add_widget (size_group, widget);
+
+	e_extensible_load_extensions (E_EXTENSIBLE (object));
 }
 
 static void
 shell_searchbar_map (GtkWidget *widget)
 {
 	/* Chain up to parent's map() method. */
-	GTK_WIDGET_CLASS (parent_class)->map (widget);
+	GTK_WIDGET_CLASS (e_shell_searchbar_parent_class)->map (widget);
 
 	/* Load state after constructed() so we don't derail
 	 * subclass initialization.  We wait until map() so we
@@ -708,12 +713,11 @@ shell_searchbar_map (GtkWidget *widget)
 }
 
 static void
-shell_searchbar_class_init (EShellSearchbarClass *class)
+e_shell_searchbar_class_init (EShellSearchbarClass *class)
 {
 	GObjectClass *object_class;
 	GtkWidgetClass *widget_class;
 
-	parent_class = g_type_class_peek_parent (class);
 	g_type_class_add_private (class, sizeof (EShellSearchbarPrivate));
 
 	object_class = G_OBJECT_CLASS (class);
@@ -853,7 +857,7 @@ shell_searchbar_class_init (EShellSearchbarClass *class)
 }
 
 static void
-shell_searchbar_init (EShellSearchbar *searchbar)
+e_shell_searchbar_init (EShellSearchbar *searchbar)
 {
 	GtkBox *box;
 	GtkLabel *label;
@@ -989,32 +993,6 @@ shell_searchbar_init (EShellSearchbar *searchbar)
 		G_CONNECT_AFTER | G_CONNECT_SWAPPED);
 }
 
-GType
-e_shell_searchbar_get_type (void)
-{
-	static GType type = 0;
-
-	if (G_UNLIKELY (type == 0)) {
-		static const GTypeInfo type_info = {
-			sizeof (EShellSearchbarClass),
-			(GBaseInitFunc) NULL,
-			(GBaseFinalizeFunc) NULL,
-			(GClassInitFunc) shell_searchbar_class_init,
-			(GClassFinalizeFunc) NULL,
-			NULL,  /* class_data */
-			sizeof (EShellSearchbar),
-			0,     /* n_preallocs */
-			(GInstanceInitFunc) shell_searchbar_init,
-			NULL   /* value_table */
-		};
-
-		type = g_type_register_static (
-			GTK_TYPE_BOX, "EShellSearchbar", &type_info, 0);
-	}
-
-	return type;
-}
-
 /**
  * e_shell_searchbar_new:
  * @shell_view: an #EShellView
diff --git a/shell/e-shell-sidebar.c b/shell/e-shell-sidebar.c
index 5701321..d293f08 100644
--- a/shell/e-shell-sidebar.c
+++ b/shell/e-shell-sidebar.c
@@ -22,6 +22,7 @@
 #include "e-shell-sidebar.h"
 
 #include <e-util/e-binding.h>
+#include <e-util/e-extensible.h>
 #include <e-util/e-unicode.h>
 #include <shell/e-shell-view.h>
 
@@ -48,7 +49,9 @@ enum {
 	PROP_SHELL_VIEW
 };
 
-static gpointer parent_class;
+G_DEFINE_TYPE_WITH_CODE (
+	EShellSidebar, e_shell_sidebar, GTK_TYPE_BIN,
+	G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL))
 
 static void
 shell_sidebar_set_shell_view (EShellSidebar *shell_sidebar,
@@ -147,7 +150,7 @@ shell_sidebar_dispose (GObject *object)
 	}
 
 	/* Chain up to parent's dispose() method. */
-	G_OBJECT_CLASS (parent_class)->dispose (object);
+	G_OBJECT_CLASS (e_shell_sidebar_parent_class)->dispose (object);
 }
 
 static void
@@ -162,7 +165,7 @@ shell_sidebar_finalize (GObject *object)
 	g_free (priv->secondary_text);
 
 	/* Chain up to parent's finalize() method. */
-	G_OBJECT_CLASS (parent_class)->finalize (object);
+	G_OBJECT_CLASS (e_shell_sidebar_parent_class)->finalize (object);
 }
 
 static void
@@ -191,6 +194,8 @@ shell_sidebar_constructed (GObject *object)
 	g_object_get (action, "label", &label, NULL);
 	e_shell_sidebar_set_primary_text (shell_sidebar, label);
 	g_free (label);
+
+	e_extensible_load_extensions (E_EXTENSIBLE (object));
 }
 
 static void
@@ -211,7 +216,7 @@ shell_sidebar_destroy (GtkObject *gtk_object)
 	}
 
 	/* Chain up to parent's destroy() method. */
-	GTK_OBJECT_CLASS (parent_class)->destroy (gtk_object);
+	GTK_OBJECT_CLASS (e_shell_sidebar_parent_class)->destroy (gtk_object);
 }
 
 static void
@@ -282,19 +287,18 @@ shell_sidebar_forall (GtkContainer *container,
 		callback (priv->event_box, callback_data);
 
 	/* Chain up to parent's forall() method. */
-	GTK_CONTAINER_CLASS (parent_class)->forall (
+	GTK_CONTAINER_CLASS (e_shell_sidebar_parent_class)->forall (
 		container, include_internals, callback, callback_data);
 }
 
 static void
-shell_sidebar_class_init (EShellSidebarClass *class)
+e_shell_sidebar_class_init (EShellSidebarClass *class)
 {
 	GObjectClass *object_class;
 	GtkObjectClass *gtk_object_class;
 	GtkWidgetClass *widget_class;
 	GtkContainerClass *container_class;
 
-	parent_class = g_type_class_peek_parent (class);
 	g_type_class_add_private (class, sizeof (EShellSidebarPrivate));
 
 	object_class = G_OBJECT_CLASS (class);
@@ -378,7 +382,7 @@ shell_sidebar_class_init (EShellSidebarClass *class)
 }
 
 static void
-shell_sidebar_init (EShellSidebar *shell_sidebar)
+e_shell_sidebar_init (EShellSidebar *shell_sidebar)
 {
 	GtkStyle *style;
 	GtkWidget *widget;
@@ -446,32 +450,6 @@ shell_sidebar_init (EShellSidebar *shell_sidebar)
 	e_binding_new (shell_sidebar, "secondary-text", widget, "label");
 }
 
-GType
-e_shell_sidebar_get_type (void)
-{
-	static GType type = 0;
-
-	if (G_UNLIKELY (type == 0)) {
-		static const GTypeInfo type_info = {
-			sizeof (EShellSidebarClass),
-			(GBaseInitFunc) NULL,
-			(GBaseFinalizeFunc) NULL,
-			(GClassInitFunc) shell_sidebar_class_init,
-			(GClassFinalizeFunc) NULL,
-			NULL,  /* class_data */
-			sizeof (EShellSidebar),
-			0,     /* n_preallocs */
-			(GInstanceInitFunc) shell_sidebar_init,
-			NULL   /* value_table */
-		};
-
-		type = g_type_register_static (
-			GTK_TYPE_BIN, "EShellSidebar", &type_info, 0);
-	}
-
-	return type;
-}
-
 /**
  * e_shell_sidebar_new:
  * @shell_view: an #EShellView
diff --git a/shell/e-shell-switcher.c b/shell/e-shell-switcher.c
index 7e82e55..ad9a3c7 100644
--- a/shell/e-shell-switcher.c
+++ b/shell/e-shell-switcher.c
@@ -22,6 +22,7 @@
 #include "e-shell-switcher.h"
 
 #include <glib/gi18n.h>
+#include <e-util/e-extensible.h>
 
 #define E_SHELL_SWITCHER_GET_PRIVATE(obj) \
 	(G_TYPE_INSTANCE_GET_PRIVATE \
@@ -50,9 +51,17 @@ enum {
 	LAST_SIGNAL
 };
 
-static gpointer parent_class;
 static guint signals[LAST_SIGNAL];
 
+/* Forward Declarations */
+static void shell_switcher_tool_shell_iface_init (GtkToolShellIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (
+	EShellSwitcher, e_shell_switcher, GTK_TYPE_BIN,
+	G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL)
+	G_IMPLEMENT_INTERFACE (GTK_TYPE_TOOL_SHELL,
+		shell_switcher_tool_shell_iface_init))
+
 static gint
 shell_switcher_layout_actions (EShellSwitcher *switcher)
 {
@@ -223,7 +232,7 @@ shell_switcher_dispose (GObject *object)
 	}
 
 	/* Chain up to parent's dispose() method. */
-	G_OBJECT_CLASS (parent_class)->dispose (object);
+	G_OBJECT_CLASS (e_shell_switcher_parent_class)->dispose (object);
 }
 
 static void
@@ -346,7 +355,8 @@ shell_switcher_remove (GtkContainer *container,
 	}
 
 	/* Chain up to parent's remove() method. */
-	GTK_CONTAINER_CLASS (parent_class)->remove (container, widget);
+	GTK_CONTAINER_CLASS (e_shell_switcher_parent_class)->remove (
+		container, widget);
 }
 
 static void
@@ -364,7 +374,7 @@ shell_switcher_forall (GtkContainer *container,
 			priv->proxies, (GFunc) callback, callback_data);
 
 	/* Chain up to parent's forall() method. */
-	GTK_CONTAINER_CLASS (parent_class)->forall (
+	GTK_CONTAINER_CLASS (e_shell_switcher_parent_class)->forall (
 		container, include_internals, callback, callback_data);
 }
 
@@ -410,13 +420,12 @@ shell_switcher_get_relief_style (GtkToolShell *shell)
 }
 
 static void
-shell_switcher_class_init (EShellSwitcherClass *class)
+e_shell_switcher_class_init (EShellSwitcherClass *class)
 {
 	GObjectClass *object_class;
 	GtkWidgetClass *widget_class;
 	GtkContainerClass *container_class;
 
-	parent_class = g_type_class_peek_parent (class);
 	g_type_class_add_private (class, sizeof (EShellSwitcherPrivate));
 
 	object_class = G_OBJECT_CLASS (class);
@@ -487,11 +496,13 @@ shell_switcher_class_init (EShellSwitcherClass *class)
 }
 
 static void
-shell_switcher_init (EShellSwitcher *switcher)
+e_shell_switcher_init (EShellSwitcher *switcher)
 {
 	switcher->priv = E_SHELL_SWITCHER_GET_PRIVATE (switcher);
 
 	GTK_WIDGET_SET_FLAGS (switcher, GTK_NO_WINDOW);
+
+	e_extensible_load_extensions (E_EXTENSIBLE (switcher));
 }
 
 static void
@@ -503,41 +514,6 @@ shell_switcher_tool_shell_iface_init (GtkToolShellIface *iface)
 	iface->get_relief_style = shell_switcher_get_relief_style;
 }
 
-GType
-e_shell_switcher_get_type (void)
-{
-	static GType type = 0;
-
-	if (G_UNLIKELY (type == 0)) {
-		static const GTypeInfo type_info = {
-			sizeof (EShellSwitcherClass),
-			(GBaseInitFunc) NULL,
-			(GBaseFinalizeFunc) NULL,
-			(GClassInitFunc) shell_switcher_class_init,
-			(GClassFinalizeFunc) NULL,
-			NULL,  /* class_data */
-			sizeof (EShellSwitcher),
-			0,     /* n_preallocs */
-			(GInstanceInitFunc) shell_switcher_init,
-			NULL   /* value_table */
-		};
-
-		static const GInterfaceInfo tool_shell_info = {
-			(GInterfaceInitFunc) shell_switcher_tool_shell_iface_init,
-			(GInterfaceFinalizeFunc) NULL,
-			NULL   /* interface_data */
-		};
-
-		type = g_type_register_static (
-			GTK_TYPE_BIN, "EShellSwitcher", &type_info, 0);
-
-		g_type_add_interface_static (
-			type, GTK_TYPE_TOOL_SHELL, &tool_shell_info);
-	}
-
-	return type;
-}
-
 /**
  * e_shell_switcher_new:
  *
diff --git a/shell/e-shell-taskbar.c b/shell/e-shell-taskbar.c
index 53ccae6..a2e0e36 100644
--- a/shell/e-shell-taskbar.c
+++ b/shell/e-shell-taskbar.c
@@ -23,7 +23,8 @@
 
 #include <e-shell-view.h>
 
-#include <widgets/misc/e-activity-proxy.h>
+#include <e-util/e-extensible.h>
+#include <misc/e-activity-proxy.h>
 
 #define E_SHELL_TASKBAR_GET_PRIVATE(obj) \
 	(G_TYPE_INSTANCE_GET_PRIVATE \
@@ -49,7 +50,9 @@ enum {
 	PROP_SHELL_VIEW
 };
 
-static gpointer parent_class;
+G_DEFINE_TYPE_WITH_CODE (
+	EShellTaskbar, e_shell_taskbar, GTK_TYPE_HBOX,
+	G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL))
 
 static void
 shell_taskbar_activity_remove (EShellTaskbar *shell_taskbar,
@@ -191,7 +194,7 @@ shell_taskbar_dispose (GObject *object)
 	g_hash_table_remove_all (priv->proxy_table);
 
 	/* Chain up to parent's dispose() method. */
-	G_OBJECT_CLASS (parent_class)->dispose (object);
+	G_OBJECT_CLASS (e_shell_taskbar_parent_class)->dispose (object);
 }
 
 static void
@@ -204,7 +207,7 @@ shell_taskbar_finalize (GObject *object)
 	g_hash_table_destroy (priv->proxy_table);
 
 	/* Chain up to parent's finalize() method. */
-	G_OBJECT_CLASS (parent_class)->finalize (object);
+	G_OBJECT_CLASS (e_shell_taskbar_parent_class)->finalize (object);
 }
 
 static void
@@ -226,16 +229,17 @@ shell_taskbar_constructed (GObject *object)
 		shell_backend, "activity-added",
 		G_CALLBACK (shell_taskbar_activity_add), shell_taskbar);
 
-	/* to not enlarge window width on new activities */
+	/* Do not enlarge window width on new activities. */
 	gtk_widget_set_size_request (GTK_WIDGET (shell_taskbar), 0, -1);
+
+	e_extensible_load_extensions (E_EXTENSIBLE (object));
 }
 
 static void
-shell_taskbar_class_init (EShellTaskbarClass *class)
+e_shell_taskbar_class_init (EShellTaskbarClass *class)
 {
 	GObjectClass *object_class;
 
-	parent_class = g_type_class_peek_parent (class);
 	g_type_class_add_private (class, sizeof (EShellTaskbarPrivate));
 
 	object_class = G_OBJECT_CLASS (class);
@@ -279,7 +283,7 @@ shell_taskbar_class_init (EShellTaskbarClass *class)
 }
 
 static void
-shell_taskbar_init (EShellTaskbar *shell_taskbar)
+e_shell_taskbar_init (EShellTaskbar *shell_taskbar)
 {
 	GtkWidget *widget;
 	GHashTable *proxy_table;
@@ -315,32 +319,6 @@ shell_taskbar_init (EShellTaskbar *shell_taskbar)
 		GTK_WIDGET (shell_taskbar), -1, (height * 2));
 }
 
-GType
-e_shell_taskbar_get_type (void)
-{
-	static GType type = 0;
-
-	if (G_UNLIKELY (type == 0)) {
-		static const GTypeInfo type_info = {
-			sizeof (EShellTaskbarClass),
-			(GBaseInitFunc) NULL,
-			(GBaseFinalizeFunc) NULL,
-			(GClassInitFunc) shell_taskbar_class_init,
-			(GClassFinalizeFunc) NULL,
-			NULL,  /* class_data */
-			sizeof (EShellTaskbar),
-			0,     /* n_preallocs */
-			(GInstanceInitFunc) shell_taskbar_init,
-			NULL   /* value_table */
-		};
-
-		type = g_type_register_static (
-			GTK_TYPE_HBOX, "EShellTaskbar", &type_info, 0);
-	}
-
-	return type;
-}
-
 /**
  * e_shell_taskbar_new:
  * @shell_view: an #EShellView
diff --git a/shell/e-shell-view.c b/shell/e-shell-view.c
index 537024a..8b94200 100644
--- a/shell/e-shell-view.c
+++ b/shell/e-shell-view.c
@@ -24,11 +24,12 @@
 #include <string.h>
 #include <glib/gi18n.h>
 
-#include "e-util/e-util-private.h"
-#include "e-util/e-util.h"
+#include "e-util/e-extensible.h"
 #include "e-util/e-file-utils.h"
 #include "e-util/e-plugin-ui.h"
 #include "e-util/e-ui-manager.h"
+#include "e-util/e-util-private.h"
+#include "e-util/e-util.h"
 #include "filter/e-rule-context.h"
 
 #include "e-shell-window-actions.h"
@@ -575,6 +576,8 @@ shell_view_constructed (GObject *object)
 	/* Size group should be safe to unreference now. */
 	g_object_unref (shell_view->priv->size_group);
 	shell_view->priv->size_group = NULL;
+
+	e_extensible_load_extensions (E_EXTENSIBLE (object));
 }
 
 static void
@@ -970,9 +973,18 @@ e_shell_view_get_type (void)
 			NULL   /* value_table */
 		};
 
+		const GInterfaceInfo extensible_info = {
+			(GInterfaceInitFunc) NULL,
+			(GInterfaceFinalizeFunc) NULL,
+			NULL   /* interface_data */
+		};
+
 		type = g_type_register_static (
 			G_TYPE_OBJECT, "EShellView",
 			&type_info, G_TYPE_FLAG_ABSTRACT);
+
+		g_type_add_interface_static (
+			type, E_TYPE_EXTENSIBLE, &extensible_info);
 	}
 
 	return type;
diff --git a/shell/e-shell-window.c b/shell/e-shell-window.c
index 2834457..8215faa 100644
--- a/shell/e-shell-window.c
+++ b/shell/e-shell-window.c
@@ -23,6 +23,7 @@
 
 #include <gconf/gconf-client.h>
 
+#include <e-util/e-extensible.h>
 #include <e-util/e-plugin-ui.h>
 #include <e-util/e-util-private.h>
 
@@ -45,9 +46,12 @@ enum {
 	LAST_SIGNAL
 };
 
-static gpointer parent_class;
 static gulong signals[LAST_SIGNAL];
 
+G_DEFINE_TYPE_WITH_CODE (
+	EShellWindow, e_shell_window, GTK_TYPE_WINDOW,
+	G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL))
+
 static void
 shell_window_menubar_update_new_menu (EShellWindow *shell_window)
 {
@@ -299,7 +303,7 @@ shell_window_dispose (GObject *object)
 	e_shell_window_private_dispose (E_SHELL_WINDOW (object));
 
 	/* Chain up to parent's dispose() method. */
-	G_OBJECT_CLASS (parent_class)->dispose (object);
+	G_OBJECT_CLASS (e_shell_window_parent_class)->dispose (object);
 }
 
 static void
@@ -308,13 +312,15 @@ shell_window_finalize (GObject *object)
 	e_shell_window_private_finalize (E_SHELL_WINDOW (object));
 
 	/* Chain up to parent's finalize() method. */
-	G_OBJECT_CLASS (parent_class)->finalize (object);
+	G_OBJECT_CLASS (e_shell_window_parent_class)->finalize (object);
 }
 
 static void
 shell_window_constructed (GObject *object)
 {
 	e_shell_window_private_constructed (E_SHELL_WINDOW (object));
+
+	e_extensible_load_extensions (E_EXTENSIBLE (object));
 }
 
 static GtkWidget *
@@ -583,11 +589,10 @@ shell_window_create_shell_view (EShellWindow *shell_window,
 }
 
 static void
-shell_window_class_init (EShellWindowClass *class)
+e_shell_window_class_init (EShellWindowClass *class)
 {
 	GObjectClass *object_class;
 
-	parent_class = g_type_class_peek_parent (class);
 	g_type_class_add_private (class, sizeof (EShellWindowPrivate));
 
 	object_class = G_OBJECT_CLASS (class);
@@ -780,39 +785,13 @@ shell_window_class_init (EShellWindowClass *class)
 }
 
 static void
-shell_window_init (EShellWindow *shell_window)
+e_shell_window_init (EShellWindow *shell_window)
 {
 	shell_window->priv = E_SHELL_WINDOW_GET_PRIVATE (shell_window);
 
 	e_shell_window_private_init (shell_window);
 }
 
-GType
-e_shell_window_get_type (void)
-{
-	static GType type = 0;
-
-	if (G_UNLIKELY (type == 0)) {
-		const GTypeInfo type_info = {
-			sizeof (EShellWindowClass),
-			(GBaseInitFunc) NULL,
-			(GBaseFinalizeFunc) NULL,
-			(GClassInitFunc) shell_window_class_init,
-			(GClassFinalizeFunc) NULL,
-			NULL,  /* class_data */
-			sizeof (EShellWindow),
-			0,     /* n_preallocs */
-			(GInstanceInitFunc) shell_window_init,
-			NULL   /* value_table */
-		};
-
-		type = g_type_register_static (
-			GTK_TYPE_WINDOW, "EShellWindow", &type_info, 0);
-	}
-
-	return type;
-}
-
 /**
  * e_shell_window_new:
  * @shell: an #EShell
diff --git a/shell/e-shell.c b/shell/e-shell.c
index 8dbf8a5..f428984 100644
--- a/shell/e-shell.c
+++ b/shell/e-shell.c
@@ -24,9 +24,10 @@
 #include <glib/gi18n.h>
 #include <libedataserverui/e-passwords.h>
 
+#include "e-util/e-module.h"
+#include "e-util/e-extensible.h"
 #include "e-util/e-util-private.h"
 #include "e-util/e-util.h"
-#include "e-util/e-module.h"
 #include "smclient/eggsmclient.h"
 #include "widgets/misc/e-preferences-window.h"
 
@@ -94,7 +95,6 @@ static GDebugKey debug_keys[] = {
 	{ "settings",	DEBUG_KEY_SETTINGS }
 };
 
-static gpointer parent_class;
 static gpointer default_shell;
 static guint signals[LAST_SIGNAL];
 
@@ -102,6 +102,10 @@ static guint signals[LAST_SIGNAL];
 gboolean e_shell_dbus_initialize (EShell *shell);
 #endif
 
+G_DEFINE_TYPE_WITH_CODE (
+	EShell, e_shell, UNIQUE_TYPE_APP,
+	G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL))
+
 static void
 shell_parse_debug_string (EShell *shell)
 {
@@ -606,7 +610,7 @@ shell_dispose (GObject *object)
 	}
 
 	/* Chain up to parent's dispose() method. */
-	G_OBJECT_CLASS (parent_class)->dispose (object);
+	G_OBJECT_CLASS (e_shell_parent_class)->dispose (object);
 }
 
 static void
@@ -627,7 +631,7 @@ shell_finalize (GObject *object)
 	g_free (priv->module_directory);
 
 	/* Chain up to parent's finalize() method. */
-	G_OBJECT_CLASS (parent_class)->finalize (object);
+	G_OBJECT_CLASS (e_shell_parent_class)->finalize (object);
 }
 
 static void
@@ -656,6 +660,8 @@ shell_constructed (GObject *object)
 	e_type_traverse (
 		E_TYPE_SHELL_BACKEND, (ETypeFunc)
 		shell_add_backend, object);
+
+	e_extensible_load_extensions (E_EXTENSIBLE (object));
 }
 
 static UniqueResponse
@@ -740,7 +746,7 @@ shell_message_received (UniqueApp *app,
 	}
 
 	/* Chain up to parent's message_received() method. */
-	return UNIQUE_APP_CLASS (parent_class)->
+	return UNIQUE_APP_CLASS (e_shell_parent_class)->
 		message_received (app, command, data, time_);
 }
 
@@ -752,12 +758,11 @@ shell_window_destroyed (EShell *shell)
 }
 
 static void
-shell_class_init (EShellClass *class)
+e_shell_class_init (EShellClass *class)
 {
 	GObjectClass *object_class;
 	UniqueAppClass *unique_app_class;
 
-	parent_class = g_type_class_peek_parent (class);
 	g_type_class_add_private (class, sizeof (EShellPrivate));
 
 	object_class = G_OBJECT_CLASS (class);
@@ -1061,7 +1066,7 @@ shell_class_init (EShellClass *class)
 }
 
 static void
-shell_init (EShell *shell)
+e_shell_init (EShell *shell)
 {
 	GHashTable *backends_by_name;
 	GHashTable *backends_by_scheme;
@@ -1148,32 +1153,6 @@ shell_init (EShell *shell)
 		G_CALLBACK (shell_sm_quit_cb), shell);
 }
 
-GType
-e_shell_get_type (void)
-{
-	static GType type = 0;
-
-	if (G_UNLIKELY (type == 0)) {
-		const GTypeInfo type_info = {
-			sizeof (EShellClass),
-			(GBaseInitFunc) NULL,
-			(GBaseFinalizeFunc) NULL,
-			(GClassInitFunc) shell_class_init,
-			(GClassFinalizeFunc) NULL,
-			NULL,  /* class_data */
-			sizeof (EShell),
-			0,     /* n_preallocs */
-			(GInstanceInitFunc) shell_init,
-			NULL   /* value_table */
-		};
-
-		type = g_type_register_static (
-			UNIQUE_TYPE_APP, "EShell", &type_info, 0);
-	}
-
-	return type;
-}
-
 /**
  * e_shell_get_default:
  *
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