Change to node output socket drawing: Instead of always drawing only the...

Change to node output socket drawing: Instead of always drawing only the socket label for outputs, leave this check up to the socket type draw function. This gives custom node scripts more flexibility in
how to draw socket values by allowing buttons on output sockets as well.

http://wiki.blender.org/index.php/Extensions:2.6/Py/API_Changes#Python_Node_Output_Drawing

release/scripts/templates_py/custom_nodes.py

@@ -40,7 +40,7 @@ class MyCustomSocket(NodeSocket):
 
     # Optional function for drawing the socket input value
     def draw(self, context, layout, node, text):
-        if self.is_linked:
+        if self.is_output or self.is_linked:
             layout.label(text)
         else:
             layout.prop(self, "myEnumProperty", text=text)

source/blender/editors/space_node/drawnode.c

@@ -86,18 +86,12 @@ static void node_socket_button_label(bContext *UNUSED(C), uiLayout *layout, Poin
 	uiItemL(layout, text, 0);
 }
 
-static void node_draw_input_default(bContext *C, uiLayout *layout, PointerRNA *ptr, PointerRNA *node_ptr)
+static void node_draw_socket_default(bContext *C, uiLayout *layout, PointerRNA *ptr, PointerRNA *node_ptr)
 {
 	bNodeSocket *sock = (bNodeSocket *)ptr->data;
 	sock->typeinfo->draw(C, layout, ptr, node_ptr, IFACE_(sock->name));
 }
 
-static void node_draw_output_default(bContext *C, uiLayout *layout, PointerRNA *ptr, PointerRNA *node_ptr)
-{
-	bNodeSocket *sock = ptr->data;
-	node_socket_button_label(C, layout, ptr, node_ptr, IFACE_(sock->name));
-}
-
 
 /* ****************** BASE DRAW FUNCTIONS FOR NEW OPERATOR NODES ***************** */
 
@@ -2752,8 +2746,8 @@ void ED_node_init_butfuncs(void)
 	NodeTypeUndefined.tweak_area_func = node_tweak_area_default;
 	NodeTypeUndefined.draw_buttons = NULL;
 	NodeTypeUndefined.draw_buttons_ex = NULL;
-	NodeTypeUndefined.draw_input = node_draw_input_default;
-	NodeTypeUndefined.draw_output = node_draw_output_default;
+	NodeTypeUndefined.draw_input = node_draw_socket_default;
+	NodeTypeUndefined.draw_output = node_draw_socket_default;
 	NodeTypeUndefined.resize_area_func = node_resize_area_default;
 	
 	NodeSocketTypeUndefined.draw = node_socket_undefined_draw;
@@ -2770,8 +2764,8 @@ void ED_node_init_butfuncs(void)
 		ntype->tweak_area_func = node_tweak_area_default;
 		ntype->draw_buttons = NULL;
 		ntype->draw_buttons_ex = NULL;
-		ntype->draw_input = node_draw_input_default;
-		ntype->draw_output = node_draw_output_default;
+		ntype->draw_input = node_draw_socket_default;
+		ntype->draw_output = node_draw_socket_default;
 		ntype->resize_area_func = node_resize_area_default;
 		
 		node_common_set_butfunc(ntype);
@@ -2795,8 +2789,8 @@ void ED_init_custom_node_type(bNodeType *ntype)
 	/* default ui functions */
 	ntype->draw_nodetype = node_draw_default;
 	ntype->draw_nodetype_prepare = node_update_default;
-	ntype->draw_input = node_draw_input_default;
-	ntype->draw_output = node_draw_output_default;
+	ntype->draw_input = node_draw_socket_default;
+	ntype->draw_output = node_draw_socket_default;
 	ntype->resize_area_func = node_resize_area_default;
 	ntype->select_area_func = node_select_area_default;
 	ntype->tweak_area_func = node_tweak_area_default;
@@ -2840,7 +2834,7 @@ static void std_node_socket_draw(bContext *C, uiLayout *layout, PointerRNA *ptr,
 	int type = sock->typeinfo->type;
 	/*int subtype = sock->typeinfo->subtype;*/
 	
-	if ((sock->flag & SOCK_IN_USE) || (sock->flag & SOCK_HIDE_VALUE)) {
+	if ((sock->in_out == SOCK_OUT) || (sock->flag & SOCK_IN_USE) || (sock->flag & SOCK_HIDE_VALUE)) {
 		node_socket_button_label(C, layout, ptr, node_ptr, text);
 		return;
 	}