Refactoring to make adding ink drop animations easier

ui/views/animation/button_ink_drop_delegate.cc

Index: ui/views/animation/button_ink_drop_delegate.cc
diff --git a/ui/views/animation/button_ink_drop_delegate.cc b/ui/views/animation/button_ink_drop_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5d3b9ebedabc418c74d1e56ddcf09f79f0fb2f86
--- /dev/null
+++ b/ui/views/animation/button_ink_drop_delegate.cc
@@ -0,0 +1,87 @@
+// 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/views/animation/ink_drop_animation_controller.h"
+#include "ui/views/animation/ink_drop_animation_controller_factory.h"
+#include "ui/views/animation/ink_drop_host.h"
+#include "ui/views/animation/ink_drop_state.h"
+#include "ui/views/scoped_target_handler.h"
+#include "ui/views/view.h"
+
+namespace views {
+
+ButtonInkDropDelegate::ButtonInkDropDelegate(InkDropHost* ink_drop_host,
+                                             View* view)
+    : target_handler_(new views::ScopedTargetHandler(view, this)),
+      ink_drop_host_(ink_drop_host),
+      ink_drop_animation_controller_(
+          InkDropAnimationControllerFactory::CreateInkDropAnimationController(
+              ink_drop_host_)) {}
+
+ButtonInkDropDelegate::~ButtonInkDropDelegate() {
+}
+
+void ButtonInkDropDelegate::SetInkDropSize(int large_size,
+                                           int large_corner_radius,
+                                           int small_size,
+                                           int small_corner_radius) {
+  ink_drop_animation_controller_->SetInkDropSize(
+      gfx::Size(large_size, large_size), large_corner_radius,
+      gfx::Size(small_size, small_size), small_corner_radius);
+}
+
+void ButtonInkDropDelegate::OnLayout() {
+  ink_drop_animation_controller_->SetInkDropCenter(
+      ink_drop_host_->CalculateInkDropCenter());
+}
+
+void ButtonInkDropDelegate::OnAction(InkDropState state) {
+  ink_drop_animation_controller_->AnimateToState(state);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ui::EventHandler:
+
+void ButtonInkDropDelegate::OnGestureEvent(ui::GestureEvent* event) {
+  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|.
+      event->SetHandled();
+      break;
+    case ui::ET_GESTURE_LONG_PRESS:
+      ink_drop_state = InkDropState::SLOW_ACTION_PENDING;
+      break;
+    case ui::ET_GESTURE_LONG_TAP:
+      ink_drop_state = InkDropState::SLOW_ACTION;
+      break;
+    case ui::ET_GESTURE_SCROLL_BEGIN:
+    case ui::ET_GESTURE_END:
+      ink_drop_state = InkDropState::HIDDEN;
+      break;
+    default:
+      return;
+  }
+
+  InkDropState current_ink_drop_state =
+      ink_drop_animation_controller_->GetInkDropState();
+
+  if (ink_drop_state == InkDropState::HIDDEN &&
+      (current_ink_drop_state == InkDropState::QUICK_ACTION ||
+       current_ink_drop_state == InkDropState::SLOW_ACTION ||
+       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