Enhance the material design ripple API so the ripple's state can be controlled by it's owning View.

ui/views/animation/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/ink_drop_delegate.h"
+
+#include "third_party/skia/include/core/SkPaint.h"
+#include "ui/compositor/layer.h"
+#include "ui/compositor/paint_recorder.h"
+#include "ui/gfx/canvas.h"
+
+namespace views {
+
+InkDropDelegate::InkDropDelegate(ui::Layer* layer,
+                                 SkColor color,
+                                 int circle_radius,
+                                 int rounded_rect_corner_radius)
+    : layer_(layer),
+      color_(color),
+      should_render_circle_(true),
+      circle_radius_(circle_radius),
+      rounded_rect_corner_radius_(rounded_rect_corner_radius) {}
+
+InkDropDelegate::~InkDropDelegate() {}
+
+void InkDropDelegate::OnPaintLayer(const ui::PaintContext& context) {
+  SkPaint paint;
+  paint.setColor(color_);
+  paint.setFlags(SkPaint::kAntiAlias_Flag);
+  paint.setStyle(SkPaint::kFill_Style);
+
+  gfx::Rect bounds = layer_->bounds();
+
+  ui::PaintRecorder recorder(context, layer_->size());
+  gfx::Canvas* canvas = recorder.canvas();
+  if (should_render_circle()) {
+    gfx::Point midpoint(bounds.width() * 0.5f, bounds.height() * 0.5f);
+    canvas->DrawCircle(midpoint, circle_radius_, paint);
+  } else {
+    canvas->DrawRoundRect(bounds, rounded_rect_corner_radius_, paint);
+  }
+}
+
+void InkDropDelegate::OnDelegatedFrameDamage(
+    const gfx::Rect& damage_rect_in_dip) {}
+
+void InkDropDelegate::OnDeviceScaleFactorChanged(float device_scale_factor) {}
+
+base::Closure InkDropDelegate::PrepareForLayerBoundsChange() {
+  return base::Closure();
+}
+
+}  // namespace views