Extend EAttachmentView by subclassing EAttachmentHandler.

So far it only supports extending the attachment pop-up menu, but I
also plan to support extending drag and drop types.  Might even end
up replacing EMFormatHook.

Two subclasses created so far:

   EAttachmentHandlerImage	handles images (built-in)
   EAttachmentHandlerMail	handles emails (defined in mail module)


svn path=/branches/kill-bonobo/; revision=37487

1 files changed, 157 insertions, 0 deletions

diff --git a/widgets/misc/e-attachment-handler.c b/widgets/misc/e-attachment-handler.c
new file mode 100644
index 0000000000..dce139f9c3
--- /dev/null
+++ b/widgets/misc/e-attachment-handler.c
@@ -0,0 +1,157 @@
+/*
+ * e-attachment-handler.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the program; if not, see <http://www.gnu.org/licenses/>  
+ *
+ *
+ * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
+ *
+ */
+
+#include "e-attachment-handler.h"
+
+#define E_ATTACHMENT_HANDLER_GET_PRIVATE(obj) \
+	(G_TYPE_INSTANCE_GET_PRIVATE \
+	((obj), E_TYPE_ATTACHMENT_HANDLER, EAttachmentHandlerPrivate))
+
+struct _EAttachmentHandlerPrivate {
+	gpointer view;  /* weak pointer */
+};
+
+enum {
+	PROP_0,
+	PROP_VIEW
+};
+
+static gpointer parent_class;
+
+static void
+attachment_handler_set_view (EAttachmentHandler *handler,
+                             EAttachmentView *view)
+{
+	g_return_if_fail (handler->priv->view == NULL);
+
+	handler->priv->view = view;
+
+	g_object_add_weak_pointer (
+		G_OBJECT (view), &handler->priv->view);
+}
+
+static void
+attachment_handler_set_property (GObject *object,
+                                 guint property_id,
+                                 const GValue *value,
+                                 GParamSpec *pspec)
+{
+	switch (property_id) {
+		case PROP_VIEW:
+			attachment_handler_set_view (
+				E_ATTACHMENT_HANDLER (object),
+				g_value_get_object (value));
+			return;
+	}
+
+	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+}
+
+static void
+attachment_handler_get_property (GObject *object,
+                                 guint property_id,
+                                 GValue *value,
+                                 GParamSpec *pspec)
+{
+	switch (property_id) {
+		case PROP_VIEW:
+			g_value_set_object (
+				value, e_attachment_handler_get_view (
+				E_ATTACHMENT_HANDLER (object)));
+			return;
+	}
+
+	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+}
+
+static void
+attachment_handler_constructed (GObject *object)
+{
+	/* This allows subclasses to chain up safely since GObject
+	 * does not implement this method, and we might want to do
+	 * something here in the future. */
+}
+
+static void
+attachment_handler_class_init (EAttachmentHandlerClass *class)
+{
+	GObjectClass *object_class;
+
+	parent_class = g_type_class_peek_parent (class);
+	g_type_class_add_private (class, sizeof (EAttachmentHandlerPrivate));
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->set_property = attachment_handler_set_property;
+	object_class->get_property = attachment_handler_get_property;
+	object_class->constructed = attachment_handler_constructed;
+
+	g_object_class_install_property (
+		object_class,
+		PROP_VIEW,
+		g_param_spec_object (
+			"view",
+			"View",
+			NULL,
+			E_TYPE_ATTACHMENT_VIEW,
+			G_PARAM_READWRITE |
+			G_PARAM_CONSTRUCT_ONLY));
+}
+
+static void
+attachment_handler_init (EAttachmentHandler *handler)
+{
+	handler->priv = E_ATTACHMENT_HANDLER_GET_PRIVATE (handler);
+}
+
+GType
+e_attachment_handler_get_type (void)
+{
+	static GType type = 0;
+
+	if (G_UNLIKELY (type == 0)) {
+		static const GTypeInfo type_info = {
+			sizeof (EAttachmentHandlerClass),
+			(GBaseInitFunc) NULL,
+			(GBaseFinalizeFunc) NULL,
+			(GClassInitFunc) attachment_handler_class_init,
+			(GClassFinalizeFunc) NULL,
+			NULL,  /* class_data */
+			sizeof (EAttachmentHandler),
+			0,     /* n_preallocs */
+			(GInstanceInitFunc) attachment_handler_init,
+			NULL   /* value_table */
+		};
+
+		type = g_type_register_static (
+			G_TYPE_OBJECT, "EAttachmentHandler",
+			&type_info, G_TYPE_FLAG_ABSTRACT);
+	}
+
+	return type;
+}
+
+EAttachmentView *
+e_attachment_handler_get_view (EAttachmentHandler *handler)
+{
+	g_return_val_if_fail (E_IS_ATTACHMENT_HANDLER (handler), NULL);
+
+	return E_ATTACHMENT_VIEW (handler->priv->view);
+}