Added material design mouse hover feedback support.

ui/views/animation/ink_drop_animation_controller_impl.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/ink_drop_animation_controller_impl.h"
 
+#include "ui/compositor/layer.h"
 #include "ui/views/animation/ink_drop_animation.h"
 #include "ui/views/animation/ink_drop_host.h"
+#include "ui/views/animation/ink_drop_hover.h"
 
 namespace views {
 
+namespace {
+
+// The duration of the hover state fade in animation.
+const int kFadeInDurationInMs = 250;
+
+// The duration of the hover state fade out animation.
+const int kFadeOutDurationInMs = 250;
+
+}  // namespace
+
 InkDropAnimationControllerImpl::InkDropAnimationControllerImpl(
     InkDropHost* ink_drop_host)
-    : ink_drop_host_(ink_drop_host) {}
+    : ink_drop_host_(ink_drop_host),
+      root_layer_(new ui::Layer(ui::LAYER_NOT_DRAWN)),
+      is_hovered_(false) {
+  ink_drop_host_->AddInkDropLayer(root_layer_.get());
+}
 
 InkDropAnimationControllerImpl::~InkDropAnimationControllerImpl() {
   // Explicitly destroy the InkDropAnimation so that this still exists if
   // views::InkDropAnimationObserver methods are called on this.
   DestroyInkDropAnimation();
 }
 
 InkDropState InkDropAnimationControllerImpl::GetInkDropState() const {
   if (!ink_drop_animation_)
     return InkDropState::HIDDEN;
   return ink_drop_animation_->ink_drop_state();
 }
 
 void InkDropAnimationControllerImpl::AnimateToState(
     InkDropState ink_drop_state) {
   if (!ink_drop_animation_)
     CreateInkDropAnimation();
   ink_drop_animation_->AnimateToState(ink_drop_state);
 }
 
+void InkDropAnimationControllerImpl::SetHovered(bool is_hovered) {
+  if (is_hovered_ == is_hovered)
+    return;
+
+  is_hovered_ = is_hovered;
+  if (is_hovered_) {
+    if (!hover_)
+      CreateInkDropHover();
+    if (GetInkDropState() == views::InkDropState::HIDDEN) {
+      base::TimeDelta duration =
+          base::TimeDelta::FromMilliseconds(kFadeInDurationInMs);
+      hover_->FadeIn(duration);
+    }
+  } else {
+    base::TimeDelta duration =
+        base::TimeDelta::FromMilliseconds(kFadeOutDurationInMs);
+    hover_->FadeOut(duration);
+  }
+}
+
+bool InkDropAnimationControllerImpl::IsHovered() const {
+  return is_hovered_;
+}
+
 gfx::Size InkDropAnimationControllerImpl::GetInkDropLargeSize() const {
   return ink_drop_large_size_;
 }
 
 void InkDropAnimationControllerImpl::SetInkDropSize(const gfx::Size& large_size,
                                                     int large_corner_radius,
                                                     const gfx::Size& small_size,
                                                     int small_corner_radius) {
   // TODO(bruthig): Fix the ink drop animations to work for non-square sizes.
   DCHECK_EQ(large_size.width(), large_size.height())
       << "The ink drop animation does not currently support non-square sizes.";
   DCHECK_EQ(small_size.width(), small_size.height())
       << "The ink drop animation does not currently support non-square sizes.";
   ink_drop_large_size_ = large_size;
   ink_drop_large_corner_radius_ = large_corner_radius;
   ink_drop_small_size_ = small_size;
   ink_drop_small_corner_radius_ = small_corner_radius;
-  ink_drop_animation_.reset();
+
+  DestroyInkDropAnimation();
+  DestroyInkDropHover();
 }
 
 void InkDropAnimationControllerImpl::SetInkDropCenter(
     const gfx::Point& center_point) {
   ink_drop_center_ = center_point;
   if (ink_drop_animation_)
     ink_drop_animation_->SetCenterPoint(ink_drop_center_);
+  if (hover_)
+    hover_->SetCenterPoint(ink_drop_center_);
 }
 
 void InkDropAnimationControllerImpl::CreateInkDropAnimation() {
   DestroyInkDropAnimation();
 
   ink_drop_animation_.reset(new InkDropAnimation(
       ink_drop_large_size_, ink_drop_large_corner_radius_, ink_drop_small_size_,
       ink_drop_small_corner_radius_));
 
   ink_drop_animation_->AddObserver(this);
   ink_drop_animation_->SetCenterPoint(ink_drop_center_);
-  ink_drop_host_->AddInkDropLayer(ink_drop_animation_->root_layer());
+  root_layer_->Add(ink_drop_animation_->root_layer());
 }
 
 void InkDropAnimationControllerImpl::DestroyInkDropAnimation() {
   if (!ink_drop_animation_)
     return;
-  ink_drop_host_->RemoveInkDropLayer(ink_drop_animation_->root_layer());
+  root_layer_->Remove(ink_drop_animation_->root_layer());
   ink_drop_animation_->RemoveObserver(this);
   ink_drop_animation_.reset();
 }
 
+void InkDropAnimationControllerImpl::CreateInkDropHover() {
+  DestroyInkDropHover();
+
+  hover_.reset(
+      new InkDropHover(ink_drop_small_size_, ink_drop_small_corner_radius_));
+  hover_->SetCenterPoint(ink_drop_center_);
+  root_layer_->Add(hover_->root_layer());
+}
+
+void InkDropAnimationControllerImpl::DestroyInkDropHover() {
+  if (!hover_)
+    return;
+  root_layer_->Remove(hover_->root_layer());
+  hover_.reset();
+}
+
 void InkDropAnimationControllerImpl::InkDropAnimationStarted(
-    InkDropState ink_drop_state) {}
+    InkDropState ink_drop_state) {
+  switch (ink_drop_state) {
+    case views::InkDropState::HIDDEN:
+      break;
+    case views::InkDropState::ACTION_PENDING:
+    case views::InkDropState::QUICK_ACTION:
+    case views::InkDropState::SLOW_ACTION_PENDING:
+    case views::InkDropState::SLOW_ACTION:
+    case views::InkDropState::ACTIVATED:
+    case views::InkDropState::DEACTIVATED:
+      if (is_hovered_ && hover_) {
+        hover_->FadeOut(
+            base::TimeDelta::FromMilliseconds(kFadeOutDurationInMs));
+      }
+      break;
+  }
+}
 
 void InkDropAnimationControllerImpl::InkDropAnimationEnded(
     InkDropState ink_drop_state,
     InkDropAnimationEndedReason reason) {
   if (reason != SUCCESS)
     return;
   switch (ink_drop_state) {
     case views::InkDropState::QUICK_ACTION:
     case views::InkDropState::SLOW_ACTION:
     case views::InkDropState::DEACTIVATED:
       ink_drop_animation_->AnimateToState(views::InkDropState::HIDDEN);
       break;
     case views::InkDropState::HIDDEN:
       // TODO(bruthig): Investigate whether creating and destroying
       // InkDropAnimations is expensive and consider creating an
       // InkDropAnimationPool. See www.crbug.com/522175.
       DestroyInkDropAnimation();
+
+      if (is_hovered_ && hover_) {
+        hover_->FadeIn(base::TimeDelta::FromMilliseconds(kFadeInDurationInMs));
+      }
       break;
     default:
       break;
   }
 }
 
 }  // namespace views