Implement Gamepad API

components/script/dom/gamepadlist.rs

@@ -0,0 +1,61 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use dom::bindings::cell::DOMRefCell;
+use dom::bindings::codegen::Bindings::GamepadListBinding;
+use dom::bindings::codegen::Bindings::GamepadListBinding::GamepadListMethods;
+use dom::bindings::js::{JS, Root};
+use dom::bindings::reflector::{Reflector, reflect_dom_object};
+use dom::gamepad::Gamepad;
+use dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
+
+// https://www.w3.org/TR/gamepad/
+#[dom_struct]
+pub struct GamepadList {
+    reflector_: Reflector,
+    list: DOMRefCell<Vec<JS<Gamepad>>>
+}
+
+impl GamepadList {
+    fn new_inherited(list: &[&Gamepad]) -> GamepadList {
+        GamepadList {
+            reflector_: Reflector::new(),
+            list: DOMRefCell::new(list.iter().map(|g| JS::from_ref(&**g)).collect())
+        }
+    }
+
+    pub fn new(global: &GlobalScope, list: &[&Gamepad]) -> Root<GamepadList> {
+        reflect_dom_object(box GamepadList::new_inherited(list),
+                           global,
+                           GamepadListBinding::Wrap)
+    }
+
+    pub fn add_if_not_exists(&self, gamepads: &[Root<Gamepad>]) {
+        for gamepad in gamepads {
+            if !self.list.borrow().iter().any(|g| g.gamepad_id() == gamepad.gamepad_id()) {
+                self.list.borrow_mut().push(JS::from_ref(&*gamepad));
+                // Ensure that the gamepad has the correct index
+                gamepad.update_index(self.list.borrow().len() as i32 - 1);
+            }
+        }
+    }
+}
+
+impl GamepadListMethods for GamepadList {
+    // https://w3c.github.io/gamepad/#dom-navigator-getgamepads
+    fn Length(&self) -> u32 {
+        self.list.borrow().len() as u32
+    }
+
+    // https://w3c.github.io/gamepad/#dom-navigator-getgamepads
+    fn Item(&self, index: u32) -> Option<Root<Gamepad>> {
+        self.list.borrow().get(index as usize).map(|gamepad| Root::from_ref(&**gamepad))
+    }
+
+    // https://w3c.github.io/gamepad/#dom-navigator-getgamepads
+    fn IndexedGetter(&self, index: u32) -> Option<Root<Gamepad>> {
+        self.Item(index)
+    }
+}