Implement Gamepad API

components/script/dom/gamepadbuttonlist.rs

@@ -0,0 +1,63 @@
+/* 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::codegen::Bindings::GamepadButtonListBinding;
+use dom::bindings::codegen::Bindings::GamepadButtonListBinding::GamepadButtonListMethods;
+use dom::bindings::js::{JS, Root, RootedReference};
+use dom::bindings::reflector::{Reflector, reflect_dom_object};
+use dom::gamepadbutton::GamepadButton;
+use dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
+use webvr_traits::WebVRGamepadButton;
+
+// https://w3c.github.io/gamepad/#gamepadbutton-interface
+#[dom_struct]
+pub struct GamepadButtonList {
+    reflector_: Reflector,
+    list: Vec<JS<GamepadButton>>
+}
+
+impl GamepadButtonList {
+    #[allow(unrooted_must_root)]
+    fn new_inherited(list: &[&GamepadButton]) -> GamepadButtonList {
+        GamepadButtonList {
+            reflector_: Reflector::new(),
+            list: list.iter().map(|button| JS::from_ref(*button)).collect(),
+        }
+    }
+
+    pub fn new_from_vr(global: &GlobalScope, buttons: &[WebVRGamepadButton]) -> Root<GamepadButtonList> {
+        rooted_vec!(let list <- buttons.iter()
+                                       .map(|btn| GamepadButton::new(&global, btn.pressed, btn.touched)));
+
+        reflect_dom_object(box GamepadButtonList::new_inherited(list.r()),
+                           global,
+                           GamepadButtonListBinding::Wrap)
+    }
+
+    pub fn sync_from_vr(&self, vr_buttons: &[WebVRGamepadButton]) {
+        let mut index = 0;
+        for btn in vr_buttons {
+            self.list.get(index).as_ref().unwrap().update(btn.pressed, btn.touched);
+            index += 1;
+        }
+    }
+}
+
+impl GamepadButtonListMethods for GamepadButtonList {
+    // https://w3c.github.io/gamepad/#dom-gamepad-buttons
+    fn Length(&self) -> u32 {
+        self.list.len() as u32
+    }
+
+    // https://w3c.github.io/gamepad/#dom-gamepad-buttons
+    fn Item(&self, index: u32) -> Option<Root<GamepadButton>> {
+        self.list.get(index as usize).map(|button| Root::from_ref(&**button))
+    }
+
+    // https://w3c.github.io/gamepad/#dom-gamepad-buttons
+    fn IndexedGetter(&self, index: u32) -> Option<Root<GamepadButton>> {
+        self.Item(index)
+    }
+}