Added material design mouse hover feedback support.

ui/views/animation/button_ink_drop_delegate.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/animation/button_ink_drop_delegate.h"
 
 #include "ui/events/event.h"
 #include "ui/events/scoped_target_handler.h"
 #include "ui/views/animation/ink_drop_animation_controller.h"
 #include "ui/views/animation/ink_drop_animation_controller_factory.h"
@@ skipping 25 matching lines @@
 
 void ButtonInkDropDelegate::OnLayout() {
   ink_drop_animation_controller_->SetInkDropCenter(
       ink_drop_host_->CalculateInkDropCenter());
 }
 
 void ButtonInkDropDelegate::OnAction(InkDropState state) {
   ink_drop_animation_controller_->AnimateToState(state);
 }
 
+void ButtonInkDropDelegate::SetHovered(bool is_hovered) {
+  ink_drop_animation_controller_->SetHovered(is_hovered);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // ui::EventHandler:
 
+void ButtonInkDropDelegate::OnMouseEvent(ui::MouseEvent* event) {
+  switch (event->type()) {
+    case ui::ET_MOUSE_ENTERED:
+    case ui::ET_MOUSE_EXITED:
+      SetHovered(ink_drop_host_->ShouldShowInkDropHover());
+      break;
+    default:
+      return;
+  }
+}
+
 void ButtonInkDropDelegate::OnGestureEvent(ui::GestureEvent* event) {
   InkDropState current_ink_drop_state =
       ink_drop_animation_controller_->GetInkDropState();
 
   InkDropState ink_drop_state = InkDropState::HIDDEN;
   switch (event->type()) {
     case ui::ET_GESTURE_TAP_DOWN:
       ink_drop_state = InkDropState::ACTION_PENDING;
       // The ui::ET_GESTURE_TAP_DOWN event needs to be marked as handled so that
       // subsequent events for the gesture are sent to |this|.
@@ skipping 22 matching lines @@
        current_ink_drop_state == InkDropState::DEACTIVATED)) {
     // These InkDropStates automatically transition to the HIDDEN state so we
     // don't make an explicit call. Explicitly animating to HIDDEN in this case
     // would prematurely pre-empt these animations.
     return;
   }
   ink_drop_animation_controller_->AnimateToState(ink_drop_state);
 }
 
 }  // namespace views