diff -r 000000000000 -r 6474c204b198 dom/gamepad/Gamepad.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/gamepad/Gamepad.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,113 @@
+/* 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/. */
+
+#include "Gamepad.h"
+#include "nsAutoPtr.h"
+#include "nsTArray.h"
+#include "nsVariant.h"
+#include "mozilla/dom/GamepadBinding.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(Gamepad)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(Gamepad)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Gamepad)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_2(Gamepad, mParent, mButtons)
+
+Gamepad::Gamepad(nsISupports* aParent,
+                 const nsAString& aID, uint32_t aIndex,
+                 GamepadMappingType aMapping,
+                 uint32_t aNumButtons, uint32_t aNumAxes)
+  : mParent(aParent),
+    mID(aID),
+    mIndex(aIndex),
+    mMapping(aMapping),
+    mConnected(true),
+    mButtons(aNumButtons),
+    mAxes(aNumAxes)
+{
+  SetIsDOMBinding();
+  for (unsigned i = 0; i < aNumButtons; i++) {
+    mButtons.InsertElementAt(i, new GamepadButton(mParent));
+  }
+  mAxes.InsertElementsAt(0, aNumAxes, 0.0f);
+}
+
+void
+Gamepad::SetIndex(uint32_t aIndex)
+{
+  mIndex = aIndex;
+}
+
+void
+Gamepad::SetConnected(bool aConnected)
+{
+  mConnected = aConnected;
+}
+
+void
+Gamepad::SetButton(uint32_t aButton, bool aPressed, double aValue)
+{
+  MOZ_ASSERT(aButton < mButtons.Length());
+  mButtons[aButton]->SetPressed(aPressed);
+  mButtons[aButton]->SetValue(aValue);
+}
+
+void
+Gamepad::SetAxis(uint32_t aAxis, double aValue)
+{
+  MOZ_ASSERT(aAxis < mAxes.Length());
+  if (mAxes[aAxis] != aValue) {
+    mAxes[aAxis] = aValue;
+    GamepadBinding::ClearCachedAxesValue(this);
+  }
+}
+
+void
+Gamepad::SyncState(Gamepad* aOther)
+{
+  if (mButtons.Length() != aOther->mButtons.Length() ||
+      mAxes.Length() != aOther->mAxes.Length()) {
+    return;
+  }
+
+  mConnected = aOther->mConnected;
+  for (uint32_t i = 0; i < mButtons.Length(); ++i) {
+    mButtons[i]->SetPressed(aOther->mButtons[i]->Pressed());
+    mButtons[i]->SetValue(aOther->mButtons[i]->Value());
+  }
+  bool changed = false;
+  for (uint32_t i = 0; i < mAxes.Length(); ++i) {
+    changed = changed || (mAxes[i] != aOther->mAxes[i]);
+    mAxes[i] = aOther->mAxes[i];
+  }
+  if (changed) {
+    GamepadBinding::ClearCachedAxesValue(this);
+  }
+}
+
+already_AddRefed<Gamepad>
+Gamepad::Clone(nsISupports* aParent)
+{
+  nsRefPtr<Gamepad> out =
+    new Gamepad(aParent, mID, mIndex, mMapping,
+                mButtons.Length(), mAxes.Length());
+  out->SyncState(this);
+  return out.forget();
+}
+
+/* virtual */ JSObject*
+Gamepad::WrapObject(JSContext* aCx)
+{
+  return GamepadBinding::Wrap(aCx, this);
+}
+
+} // namespace dom
+} // namespace mozilla