[evolution/wip/gsettings] Bug #623593 - Cannot drag&drop attached messages from mails

[Rodrigo Moya <rodrigo src gnome org>]

commit 391e21025ae5ff0a5b7f0c5280886b329c993ec5
Author: Milan Crha <mcrha redhat com>
Date:   Tue Feb 22 17:00:10 2011 +0100

    Bug #623593 - Cannot drag&drop attached messages from mails

 widgets/misc/e-attachment-button.c |   80 ++++++++++++++++++++++++++++++++++++
 widgets/misc/e-attachment.c        |   37 +++++++++++++---
 widgets/misc/e-attachment.h        |    1 +
 3 files changed, 111 insertions(+), 7 deletions(-)
---
diff --git a/widgets/misc/e-attachment-button.c b/widgets/misc/e-attachment-button.c
index 7cadf57..16ddaab 100644
--- a/widgets/misc/e-attachment-button.c
+++ b/widgets/misc/e-attachment-button.c
@@ -268,6 +268,50 @@ attachment_button_expand_drag_data_get_cb (EAttachmentButton *button,
 {
 	EAttachmentView *view;
 
+	if (button->priv->attachment) {
+		gchar *mime_type;
+
+		mime_type = e_attachment_get_mime_type (button->priv->attachment);
+
+		if (mime_type) {
+			gboolean processed = FALSE;
+			GdkAtom atom;
+			gchar *atom_name;
+
+			atom = gtk_selection_data_get_target (selection);
+			atom_name = gdk_atom_name (atom);
+
+			if (g_strcmp0 (atom_name, mime_type) == 0) {
+				CamelMimePart *mime_part;
+
+				mime_part = e_attachment_get_mime_part (button->priv->attachment);
+				if (CAMEL_IS_MIME_PART (mime_part)) {
+					CamelDataWrapper *wrapper;
+					CamelStream *stream;
+					GByteArray *buffer;
+
+					buffer = g_byte_array_new ();
+					stream = camel_stream_mem_new ();
+					camel_stream_mem_set_byte_array (CAMEL_STREAM_MEM (stream), buffer);
+					wrapper = camel_medium_get_content (CAMEL_MEDIUM (mime_part));
+					camel_data_wrapper_decode_to_stream_sync (wrapper, stream, NULL, NULL);
+					g_object_unref (stream);
+
+					gtk_selection_data_set (selection, atom, 8, buffer->data, buffer->len);
+					processed = TRUE;
+
+					g_byte_array_free (buffer, TRUE);
+				}
+			}
+
+			g_free (atom_name);
+			g_free (mime_type);
+
+			if (processed)
+				return;
+		}
+	}
+
 	view = e_attachment_button_get_view (button);
 
 	e_attachment_view_drag_data_get (
@@ -670,6 +714,10 @@ void
 e_attachment_button_set_attachment (EAttachmentButton *button,
                                     EAttachment *attachment)
 {
+	GtkTargetEntry *targets;
+	GtkTargetList *list;
+	gint n_targets;
+
 	g_return_if_fail (E_IS_ATTACHMENT_BUTTON (button));
 
 	if (attachment != NULL) {
@@ -718,6 +766,38 @@ e_attachment_button_set_attachment (EAttachmentButton *button,
 		attachment_button_update_pixbufs (button);
 	}
 
+	/* update drag sources */
+	list = gtk_target_list_new (NULL, 0);
+	gtk_target_list_add_uri_targets (list, 0);
+
+	if (attachment) {
+		gchar *simple_type;
+
+		simple_type = e_attachment_get_mime_type (attachment);
+		if (simple_type) {
+			GtkTargetEntry attach_entry[] = { { NULL, 0, 2 } };
+
+			attach_entry[0].target = simple_type;
+
+			gtk_target_list_add_table (list, attach_entry, G_N_ELEMENTS (attach_entry));
+
+			g_free (simple_type);
+		}
+	}
+
+	targets = gtk_target_table_new_from_list (list, &n_targets);
+
+	gtk_drag_source_set (
+		button->priv->expand_button, GDK_BUTTON1_MASK,
+		targets, n_targets, GDK_ACTION_COPY);
+
+	gtk_drag_source_set (
+		button->priv->toggle_button, GDK_BUTTON1_MASK,
+		targets, n_targets, GDK_ACTION_COPY);
+
+	gtk_target_table_free (targets, n_targets);
+	gtk_target_list_unref (list);
+
 	g_object_notify (G_OBJECT (button), "attachment");
 }
 
diff --git a/widgets/misc/e-attachment.c b/widgets/misc/e-attachment.c
index 0a3bfab..a96f7ed 100644
--- a/widgets/misc/e-attachment.c
+++ b/widgets/misc/e-attachment.c
@@ -1358,26 +1358,49 @@ e_attachment_get_thumbnail_path (EAttachment *attachment)
 	return g_file_info_get_attribute_byte_string (file_info, attribute);
 }
 
-gboolean
-e_attachment_is_rfc822 (EAttachment *attachment)
+/**
+ * e_attachment_get_mime_type:
+ *
+ * Returns mime_type part of the file_info as a newly allocated string,
+ * which should be freed with g_free().
+ * Returns NULL, if mime_type not found or set on the attachment.
+ **/
+gchar *
+e_attachment_get_mime_type (EAttachment *attachment)
 {
 	GFileInfo *file_info;
 	const gchar *content_type;
 	gchar *mime_type;
-	gboolean is_rfc822;
 
-	g_return_val_if_fail (E_IS_ATTACHMENT (attachment), FALSE);
+	g_return_val_if_fail (E_IS_ATTACHMENT (attachment), NULL);
 
 	file_info = e_attachment_get_file_info (attachment);
 	if (file_info == NULL)
-		return FALSE;
+		return NULL;
 
 	content_type = g_file_info_get_content_type (file_info);
 	if (content_type == NULL)
-		return FALSE;
+		return NULL;
 
 	mime_type = g_content_type_get_mime_type (content_type);
-	is_rfc822 = (g_ascii_strcasecmp (mime_type, "message/rfc822") == 0);
+	if (!mime_type)
+		return NULL;
+
+	camel_strdown (mime_type);
+
+	return mime_type;
+}
+
+gboolean
+e_attachment_is_rfc822 (EAttachment *attachment)
+{
+	gchar *mime_type;
+	gboolean is_rfc822;
+
+	g_return_val_if_fail (E_IS_ATTACHMENT (attachment), FALSE);
+
+	mime_type = e_attachment_get_mime_type (attachment);
+	is_rfc822 = mime_type && g_ascii_strcasecmp (mime_type, "message/rfc822") == 0;
 	g_free (mime_type);
 
 	return is_rfc822;
diff --git a/widgets/misc/e-attachment.h b/widgets/misc/e-attachment.h
index 8b9edc9..26eceeb 100644
--- a/widgets/misc/e-attachment.h
+++ b/widgets/misc/e-attachment.h
@@ -80,6 +80,7 @@ void		e_attachment_set_file		(EAttachment *attachment,
 GFileInfo *	e_attachment_get_file_info	(EAttachment *attachment);
 void		e_attachment_set_file_info	(EAttachment *attachment,
 						 GFileInfo *file_info);
+gchar *		e_attachment_get_mime_type	(EAttachment *attachment);
 GIcon *		e_attachment_get_icon		(EAttachment *attachment);
 gboolean	e_attachment_get_loading	(EAttachment *attachment);
 CamelMimePart *	e_attachment_get_mime_part	(EAttachment *attachment);