auto merge of #4779 : Manishearth/servo/more-activation, r=jdm

components/script/dom/activation.rs

@@ -17,6 +17,9 @@ use std::borrow::ToOwned;
 pub trait Activatable : Copy {
     fn as_element(&self) -> Temporary<Element>;
 
+    // Is this particular instance of the element activatable?
+    fn is_instance_activatable(&self) -> bool;
+
     // https://html.spec.whatwg.org/multipage/interaction.html#run-pre-click-activation-steps
     fn pre_click_activation(&self);
 

components/script/dom/element.rs

@@ -1449,7 +1449,11 @@ impl<'a> ActivationElementHelpers<'a> for JSRef<'a, Element> {
         match node.type_id() {
             NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLInputElement)) => {
                 let element: &'a JSRef<'a, HTMLInputElement> = HTMLInputElementCast::to_borrowed_ref(self).unwrap();
+                if element.is_instance_activatable() {
                     Some(element as &'a (Activatable + 'a))
+                } else {
+                    None
+                }
             },
             _ => {
                 None

components/script/dom/htmlinputelement.rs

@@ -588,7 +588,8 @@ impl<'a> FormControl<'a> for JSRef<'a, HTMLInputElement> {
     fn mutable(self) -> bool {
         // https://html.spec.whatwg.org/multipage/forms.html#the-input-element:concept-fe-mutable
         // https://html.spec.whatwg.org/multipage/forms.html#the-readonly-attribute:concept-fe-mutable
-        !(self.Disabled() || self.ReadOnly())
+        let node: JSRef<Node> = NodeCast::from_ref(self);
+        !(node.get_disabled_state() || self.ReadOnly())
     }
 
     // https://html.spec.whatwg.org/multipage/forms.html#the-input-element:concept-form-reset-control
@@ -613,6 +614,18 @@ impl<'a> Activatable for JSRef<'a, HTMLInputElement> {
         Temporary::from_rooted(ElementCast::from_ref(*self))
     }
 
+    fn is_instance_activatable(&self) -> bool {
+        match self.input_type.get() {
+            // https://html.spec.whatwg.org/multipage/forms.html#submit-button-state-%28type=submit%29:activation-behaviour-2
+            // https://html.spec.whatwg.org/multipage/forms.html#reset-button-state-%28type=reset%29:activation-behaviour-2
+            // https://html.spec.whatwg.org/multipage/forms.html#checkbox-state-%28type=checkbox%29:activation-behaviour-2
+            // https://html.spec.whatwg.org/multipage/forms.html#radio-button-state-%28type=radio%29:activation-behaviour-2
+            InputType::InputSubmit | InputType::InputReset
+            | InputType::InputCheckbox | InputType::InputRadio => self.mutable(),
+            _ => false
+        }
+    }
+
     // https://html.spec.whatwg.org/multipage/interaction.html#run-pre-click-activation-steps
     #[allow(unsafe_blocks)]
     fn pre_click_activation(&self) {