Move child_inserted into VirtualMethods.

Follow-up from #1984.

src/components/script/dom/htmlstyleelement.rs

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use dom::bindings::codegen::HTMLStyleElementBinding;
-use dom::bindings::codegen::InheritTypes::{HTMLStyleElementDerived, NodeCast};
+use dom::bindings::codegen::InheritTypes::{HTMLElementCast, HTMLStyleElementDerived, NodeCast};
 use dom::bindings::js::JS;
 use dom::bindings::error::ErrorResult;
 use dom::document::Document;
@@ -11,6 +11,7 @@ use dom::element::HTMLStyleElementTypeId;
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
 use dom::htmlelement::HTMLElement;
 use dom::node::{Node, ElementNodeTypeId, window_from_node};
+use dom::virtualmethods::VirtualMethods;
 use html::cssparse::parse_inline_css;
 use layout_interface::{AddStylesheetMsg, LayoutChan};
 use servo_util::str::DOMString;
@@ -91,3 +92,18 @@ impl StyleElementHelpers for JS<HTMLStyleElement> {
         layout_chan.send(AddStylesheetMsg(sheet));
     }
 }
+
+impl VirtualMethods for JS<HTMLStyleElement> {
+    fn super_type(&self) -> Option<~VirtualMethods:> {
+        let htmlelement: JS<HTMLElement> = HTMLElementCast::from(self);
+        Some(~htmlelement as ~VirtualMethods:)
+    }
+
+    fn child_inserted(&mut self, child: &JS<Node>) {
+        match self.super_type() {
+            Some(ref mut s) => s.child_inserted(child),
+            _ => (),
+        }
+        self.parse_own_css();
+    }
+}

src/components/script/dom/node.rs

@@ -6,7 +6,7 @@
 
 use dom::attr::Attr;
 use dom::bindings::codegen::InheritTypes::{CommentCast, DocumentCast, DocumentTypeCast};
-use dom::bindings::codegen::InheritTypes::{ElementCast, HTMLStyleElementCast, TextCast, NodeCast};
+use dom::bindings::codegen::InheritTypes::{ElementCast, TextCast, NodeCast};
 use dom::bindings::codegen::InheritTypes::{CharacterDataCast, NodeBase, NodeDerived};
 use dom::bindings::codegen::InheritTypes::{ProcessingInstructionCast, EventTargetCast};
 use dom::bindings::codegen::NodeBinding::NodeConstants;
@@ -21,7 +21,6 @@ use dom::documentfragment::DocumentFragment;
 use dom::documenttype::DocumentType;
 use dom::element::{Element, ElementTypeId, HTMLAnchorElementTypeId};
 use dom::eventtarget::{EventTarget, NodeTargetTypeId};
-use dom::htmlstyleelement::StyleElementHelpers;
 use dom::nodelist::{NodeList};
 use dom::processinginstruction::ProcessingInstruction;
 use dom::text::Text;
@@ -270,8 +269,6 @@ pub trait NodeHelpers {
     fn add_child(&mut self, new_child: &mut JS<Node>, before: Option<JS<Node>>);
     fn remove_child(&mut self, child: &mut JS<Node>);
 
-    fn child_inserted(&self);
-
     fn get_hover_state(&self) -> bool;
     fn set_hover_state(&mut self, state: bool);
 
@@ -411,7 +408,7 @@ impl NodeHelpers for JS<Node> {
             }
         }
 
-        self.parent_node().map(|parent| parent.child_inserted());
+        self.parent_node().map(|parent| vtable_for(&parent).child_inserted(self));
         document.get().content_changed();
     }
 
@@ -503,15 +500,6 @@ impl NodeHelpers for JS<Node> {
         child_node.set_parent_node(None);
     }
 
-    fn child_inserted(&self) {
-        // Parse text content added to an inline stylesheet.
-        match HTMLStyleElementCast::to(self) {
-            Some(elem) => elem.parse_own_css(),
-            None => ()
-        }
-    }
-
-
     fn get_hover_state(&self) -> bool {
         self.get().flags.get_in_hover_state()
     }

src/components/script/dom/virtualmethods.rs

@@ -7,14 +7,16 @@ use dom::bindings::codegen::InheritTypes::HTMLElementCast;
 use dom::bindings::codegen::InheritTypes::HTMLIFrameElementCast;
 use dom::bindings::codegen::InheritTypes::HTMLImageElementCast;
 use dom::bindings::codegen::InheritTypes::HTMLObjectElementCast;
+use dom::bindings::codegen::InheritTypes::HTMLStyleElementCast;
 use dom::bindings::js::JS;
 use dom::element::Element;
 use dom::element::{ElementTypeId, HTMLImageElementTypeId};
-use dom::element::{HTMLIFrameElementTypeId, HTMLObjectElementTypeId};
+use dom::element::{HTMLIFrameElementTypeId, HTMLObjectElementTypeId, HTMLStyleElementTypeId};
 use dom::htmlelement::HTMLElement;
 use dom::htmliframeelement::HTMLIFrameElement;
 use dom::htmlimageelement::HTMLImageElement;
 use dom::htmlobjectelement::HTMLObjectElement;
+use dom::htmlstyleelement::HTMLStyleElement;
 use dom::node::{Node, ElementNodeTypeId};
 use servo_util::str::DOMString;
 
@@ -58,6 +60,14 @@ pub trait VirtualMethods {
             _ => (),
         }
     }
+
+    /// Called on the parent when a node is added to its child list.
+    fn child_inserted(&mut self, child: &JS<Node>) {
+        match self.super_type() {
+            Some(ref mut s) => s.child_inserted(child),
+            _ => (),
+        }
+    }
 }
 
 /// Obtain a VirtualMethods instance for a given Node-derived object. Any
@@ -78,6 +88,10 @@ pub fn vtable_for<'a>(node: &JS<Node>) -> ~VirtualMethods: {
             let element: JS<HTMLObjectElement> = HTMLObjectElementCast::to(node).unwrap();
             ~element as ~VirtualMethods:
         }
+        ElementNodeTypeId(HTMLStyleElementTypeId) => {
+            let element: JS<HTMLStyleElement> = HTMLStyleElementCast::to(node).unwrap();
+            ~element as ~VirtualMethods:
+        }
         ElementNodeTypeId(ElementTypeId) => {
             let element: JS<Element> = ElementCast::to(node).unwrap();
             ~element as ~VirtualMethods: