Use ink drop hover for focus states on toolbar buttons and location

ui/views/animation/ink_drop_host_view.cc

 // Copyright 2016 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_host_view.h"
 
 #include "ui/gfx/color_palette.h"
 #include "ui/gfx/geometry/size_conversions.h"
+#include "ui/views/animation/ink_drop.h"
 #include "ui/views/animation/ink_drop_hover.h"
 #include "ui/views/animation/square_ink_drop_ripple.h"
 
 namespace views {
 
 // Default sizes for ink drop effects.
 const int kInkDropSize = 24;
 const int kInkDropLargeCornerRadius = 4;
 
 // The scale factor to compute the large ink drop size.
 const float kLargeInkDropScale = 1.333f;
 
 namespace {
 
 gfx::Size CalculateLargeInkDropSize(const gfx::Size small_size) {
   return gfx::ScaleToCeiledSize(gfx::Size(small_size), kLargeInkDropScale);
 }
 
 }  // namespace
 
 // static
 const int InkDropHostView::kInkDropSmallCornerRadius = 2;
 
 InkDropHostView::InkDropHostView()
-    : ink_drop_size_(kInkDropSize, kInkDropSize) {}
+    : ink_drop_size_(kInkDropSize, kInkDropSize), destroying_(false) {}
 
-InkDropHostView::~InkDropHostView() {}
+InkDropHostView::~InkDropHostView() {
+  // TODO(bruthig): Improve InkDropImpl to be safer about calling back to
+  // potentially destroyed InkDropHosts and remove |destroying_|.
+  destroying_ = true;
+}
 
 void InkDropHostView::AddInkDropLayer(ui::Layer* ink_drop_layer) {
   SetPaintToLayer(true);
   layer()->SetFillsBoundsOpaquely(false);
   layer()->Add(ink_drop_layer);
   layer()->StackAtBottom(ink_drop_layer);
 }
 
 void InkDropHostView::RemoveInkDropLayer(ui::Layer* ink_drop_layer) {
+  // No need to do anything when called during shutdown, and if a derived
+  // class has overridden Add/RemoveInkDropLayer, running this implementation
+  // would be wrong.
+  if (destroying_)
+    return;
   layer()->Remove(ink_drop_layer);
   SetPaintToLayer(false);
 }
 
 std::unique_ptr<InkDropRipple> InkDropHostView::CreateInkDropRipple() const {
   std::unique_ptr<InkDropRipple> ripple(new SquareInkDropRipple(
       CalculateLargeInkDropSize(ink_drop_size_), kInkDropLargeCornerRadius,
       ink_drop_size_, kInkDropSmallCornerRadius, GetInkDropCenter(),
       GetInkDropBaseColor()));
   return ripple;
 }
 
 std::unique_ptr<InkDropHover> InkDropHostView::CreateInkDropHover() const {
   std::unique_ptr<InkDropHover> hover(
       new InkDropHover(ink_drop_size_, kInkDropSmallCornerRadius,
                        GetInkDropCenter(), GetInkDropBaseColor()));
   hover->set_explode_size(CalculateLargeInkDropSize(ink_drop_size_));
   return hover;
 }
 
+void InkDropHostView::OnFocus() {
+  views::View::OnFocus();
+  if (ink_drop_delegate() && ShouldShowInkDropForFocus())
+    ink_drop_delegate()->GetInkDrop()->SetFocused(true);
+}
+
+void InkDropHostView::OnBlur() {
+  views::View::OnBlur();
+  if (ink_drop_delegate() && ShouldShowInkDropForFocus())
+    ink_drop_delegate()->GetInkDrop()->SetFocused(false);
+}
+
 gfx::Point InkDropHostView::GetInkDropCenter() const {
   return GetLocalBounds().CenterPoint();
 }
 
 SkColor InkDropHostView::GetInkDropBaseColor() const {
   NOTREACHED();
   return gfx::kPlaceholderColor;
 }
 
+bool InkDropHostView::ShouldShowInkDropForFocus() const {
+  return false;
+}
+
 }  // namespace views