Adding new maximize menu according to spec

ui/views/radial_menu/radial_menu_views.cc

+// Copyright (c) 2012 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/radial_menu/radial_menu_views.h"
+
+#include "base/time.h"
+#include "base/timer.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "third_party/skia/include/core/SkShader.h"
+#include "third_party/skia/include/core/SkXfermode.h"
+#include "third_party/skia/include/effects/SkGradientShader.h"
+#include "ui/base/animation/linear_animation.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/screen.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/views/controls/image_view.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+
+namespace {
+
+// The animation framerate.
+static const int kFrameRateHz = 60;
+
+// The opacity values for menu items dependent on their state.
+static const float kHiddenOpacity = 0.0;
+static const float kNormalOpacity = 0.8;
+static const float kDisabledOpacity = 0.4;
+static const float kActiveOpacity = 1.0;
+
+// The size values for menu items dependent on their state.
+static const float kHiddenSize = 0.0;
+static const float kNormalSize = 1.0;
+static const float kActiveSize = 1.1;
+
+// The default stroke width around the wedges.
+static const int kStrokeWidth = 2;
+
+static SkColor kUpperGradient = 0xffe0e0e0;
+static SkColor kLowerGradient = 0xff808080;
+static SkColor kStrokeColor = 0xffffffff;
+static SkColor kTransparentBlack = 0x00000000;
+
+// How long to spend moving downwards and fading out after waiting.
+// (In this case 5 frames will be used for the animation).
+static const double kDefaultTransitionLengthMS = 5 * 1.0 / kFrameRateHz;
+static const double kDestructionTransitionLengthMS = 2 * 1.0 / kFrameRateHz;
+// Within 3 frames we want to change the offset.
+static const double kOffsetTransitionLengthMS = 3.0 / kFrameRateHz;
+
+
+// A class to animate a parameter over time - allowing overlapping changes.
+// The animation method is always linear.
+class ValueAnimator {
+ public:
+  ValueAnimator(double initial_value, double current_time)
+    : start_time_(current_time),
+      current_time_(current_time),
+      end_time_(current_time),
+      start_value_(initial_value),
+      current_value_(initial_value),
+      end_value_(initial_value) { }
+
+  // Initiate an animation of the parameter - note that it will smoothly
+  // change the value from its current state. |length| is the duration of
+  // the animation in seconds beginning from now + |delay| (in seconds).
+  // The |target_value| is the value which needs to be reached.
+  // Note: animation requests without a real change get ignored.
+  void SetAnimation(double length, double delay, double target_value);
+
+  // Get the current value of the animator.
+  double GetCurrentValue() { return current_value_; }
+
+  // Advance to the new time - should get called before GetCurrentValue
+  // gets called.
+  bool AdvanceTime(double current_time);
+
+ private:
+  // The start, current and end time of the animation.
+  double start_time_;
+  double current_time_;
+  double end_time_;
+  // The start, current and end value of the animation.
+  double start_value_;
+  double current_value_;
+  double end_value_;
+
+  DISALLOW_COPY_AND_ASSIGN(ValueAnimator);
+};
+
+void ValueAnimator::SetAnimation(
+    double length,
+    double delay,
+    double target_value) {
+  // Get the current value since we might be in the middle of an animation.
+  start_value_ = current_value_;
+  end_value_ = target_value;
+  start_time_ = current_time_ + delay;
+  end_time_ = current_time_ + delay + length;
+}
+
+bool ValueAnimator::AdvanceTime(double current_time) {
+  current_time_ = current_time;
+
+  if (current_time_ >= end_time_ && current_value_ == end_value_)
+    return false;
+
+  double value = start_value_;
+  if (current_time >= end_time_) {
+    value = end_value_;
+  } else if (current_time > start_time_) {
+    value = start_value_ + (end_value_ - start_value_) *
+        (current_time_ - start_time_) / (end_time_ - start_time_);
+  }
+
+  if (current_value_ == value)
+    return false;
+
+  current_value_ = value;
+  return true;
+}
+
+// The class which handles a menu item's drawing and animation.
+class RadialMenuItemVisual : public views::ImageView {
+ public:
+  explicit RadialMenuItemVisual(RadialMenuItem* info,
+                                double current_time,
+                                gfx::Rect bounds,
+                                int inner_radius,
+                                int outer_radius,
+                                int stroke_width,
+                                double center_degree,
+                                double span_degrees);
+  ~RadialMenuItemVisual();
+
+  // Change the state of the item accordingly.
+  void ShowMenuItem();
+  void SetMenuItemActive();
+  void HideMenuItem();
+
+  // Update the time. The function will return true if the menu item is
+  // visible.
+  bool AdvanceTime(double current_time);
+
+  // Returns true if the segment is a separator.
+  bool IsSeparator();
+
+  // Returns the orientation of the wedge.
+  double center_degree() { return center_degree_ ;}
+
+  // Return the type of menu.
+  RadialMenuItem::RadialMenuItemType type() {
+    return presentation_info_->Type();
+  }
+
+  // The offset of the wedge to the designated place.
+  void SetSliderOffset(const gfx::Point& offset);
+
+  // Returns the current fractional size of this element.
+  double RelativeSize();
+
+  // Get - set the last known slider position.
+  void GetLastSliderValue(int& count, int& distance) {
+    count = last_slider_count_;
+    distance = last_slider_distance_;
+  }
+  void SetLastSliderValue(int count, int distance) {
+    last_slider_count_ = count;
+    last_slider_distance_ = distance;
+  }
+
+  // Get the associated window of this item.
+  aura::Window* GetWindow() {
+    if (popup_)
+      return popup_->GetNativeWindow();
+    return NULL;
+  }
+
+ private:
+  // Draw the wedge which is underneath the menu.
+  void CreateWedgeImage();
+
+  void GetIconBounds(
+      SkRect& bounds, int xMid, int yMid, double radians);
+
+  // The bounds on the screen for the menu.
+  gfx::Rect bounds_;
+
+  // The widget for this menu element. If the widget is NULL it will is an
+  // empty space in the menu.
+  views::Widget* popup_;
+
+  // The passed presentation information from the creator.
+  RadialMenuItem* presentation_info_;
+
+  // Animated parameters over time. Note: They might change the animation
+  // while animating.
+  scoped_ptr<ValueAnimator> opacity_;
+  scoped_ptr<ValueAnimator> size_;
+
+  scoped_ptr<ValueAnimator> slider_offset_x_;
+  scoped_ptr<ValueAnimator> slider_offset_y_;
+
+  // Our bitmap which contains the initial wedge image.
+  SkBitmap* wedge_image_;
+
+  // The graphical constants to draw the wedge.
+  int inner_radius_;
+  int outer_radius_;
+  int stroke_width_;
+  double center_degree_;
+  double span_degrees_;
+  // To avoid value / rounding instabilities we ignore changes in border areas
+  // by remembering the previous return value.
+  int last_slider_count_;
+  int last_slider_distance_;
+
+  DISALLOW_COPY_AND_ASSIGN(RadialMenuItemVisual);
+};
+
+RadialMenuItemVisual::RadialMenuItemVisual(
+    RadialMenuItem* item_info,
+    double current_time,
+    gfx::Rect bounds,
+    int inner_radius,
+    int outer_radius,
+    int stroke_width,
+    double center_degree,
+    double span_degrees)
+    : bounds_(bounds),
+      popup_(NULL),
+      presentation_info_(item_info),
+      opacity_(NULL),
+      size_(NULL),
+      slider_offset_x_(NULL),
+      slider_offset_y_(NULL),
+      wedge_image_(NULL),
+      inner_radius_(inner_radius),
+      outer_radius_(outer_radius),
+      stroke_width_(stroke_width),
+      center_degree_(center_degree),
+      span_degrees_(span_degrees),
+      last_slider_count_(0),
+      last_slider_distance_(0) {
+  // Elements might be empty to show nothing (separators).
+  if (presentation_info_->Type() == RadialMenuItem::RADIAL_BUTTON ||
+      presentation_info_->Type() == RadialMenuItem::RADIAL_SLIDER ||
+      presentation_info_->Type() == RadialMenuItem::RADIAL_DISABLED) {
+    CreateWedgeImage();
+    SetImage(gfx::ImageSkia(*wedge_image_));
+    popup_ = new views::Widget;
+    views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
+    params.transparent = true;
+    params.accept_events = false;
+    params.parent = NULL;
+    popup_->Init(params);
+    popup_->SetOpacity(0x00);
+    popup_->SetContentsView(this);
+    popup_->Show();
+
+    // Set the animation up.
+    size_.reset(new ValueAnimator(0, current_time));
+    opacity_.reset(new ValueAnimator(kHiddenOpacity, current_time));
+    slider_offset_x_.reset(new ValueAnimator(0, current_time));
+    slider_offset_y_.reset(new ValueAnimator(0, current_time));
+    ShowMenuItem();
+  }
+}
+
+RadialMenuItemVisual::~RadialMenuItemVisual() {
+  delete presentation_info_;
+
+  if (!popup_)
+    return;
+
+  popup_->Close();
+  popup_ = NULL;
+
+  delete wedge_image_;
+}
+
+void RadialMenuItemVisual::ShowMenuItem() {
+  if (!popup_)
+    return;
+
+  size_->SetAnimation(kDefaultTransitionLengthMS, 0.0, kNormalSize);
+  opacity_->SetAnimation(kDefaultTransitionLengthMS, 0.0,
+      presentation_info_->Type() == RadialMenuItem::RADIAL_DISABLED ?
+          kDisabledOpacity : kNormalOpacity);
+  // Set the offset back to the origin.
+  slider_offset_x_->SetAnimation(0, 0.0, 0);
+  slider_offset_y_->SetAnimation(0, 0.0, 0);
+}
+
+void RadialMenuItemVisual::SetMenuItemActive() {
+  if (!popup_)
+    return;
+
+  // Note: By not remembering that we were already activated the item,
+  // we will re-activate the item several times which will create a non
+  // linear smooth animation.
+  size_->SetAnimation(kDefaultTransitionLengthMS, 0.0, kActiveSize);
+  opacity_->SetAnimation(kDefaultTransitionLengthMS, 0.0,
+      presentation_info_->Type() == RadialMenuItem::RADIAL_DISABLED ?
+          kDisabledOpacity : kActiveOpacity);
+}
+
+void RadialMenuItemVisual::HideMenuItem() {
+  if (!popup_)
+    return;
+
+  size_->SetAnimation(kDestructionTransitionLengthMS, 0.0, kHiddenSize);
+  opacity_->SetAnimation(kDestructionTransitionLengthMS, 0.0, kHiddenOpacity);
+}
+
+void RadialMenuItemVisual::SetSliderOffset(const gfx::Point& offset) {
+  slider_offset_x_->SetAnimation(kOffsetTransitionLengthMS, 0.0, offset.x());
+  slider_offset_y_->SetAnimation(kOffsetTransitionLengthMS, 0.0, offset.y());
+}
+
+bool RadialMenuItemVisual::AdvanceTime(double current_time) {
+  if (!popup_)
+    return false;
+
+  // Bring the items into view by growing them quickly.
+  int xMid = bounds_.x() + bounds_.width() / 2;
+  int yMid = bounds_.y() + bounds_.height() / 2;
+  int xSize = bounds_.width() / 2;
+  int ySize = bounds_.height() / 2;
+  bool is_visible = false;
+
+  bool offset_x_changed = slider_offset_x_->AdvanceTime(current_time);
+  bool offset_y_changed = slider_offset_y_->AdvanceTime(current_time);
+  if (size_->AdvanceTime(current_time) ||
+      offset_x_changed || offset_y_changed) {
+    double current_size = size_->GetCurrentValue();
+    // Grow / shrink item from the center point.
+    popup_->SetBounds(gfx::Rect(
+        xMid - xSize * current_size + slider_offset_x_->GetCurrentValue(),
+        yMid - ySize * current_size + slider_offset_y_->GetCurrentValue(),
+        2 * xSize * current_size, 2 * ySize * current_size));
+    // When we see at least one pixel it is visible.
+    is_visible = 2 * xSize * current_size > 1.0;
+    if (is_visible) {
+      // It is necessary to scale the image to the target size, otherwise
+      // it would only get cropped.
+      SetImageSize(
+          gfx::Size(2 * xSize * current_size, 2 * ySize * current_size));
+    }
+  }
+
+  if (opacity_->AdvanceTime(current_time)) {
+    unsigned char opacity = static_cast<unsigned char>(
+        opacity_->GetCurrentValue() * 255.0);
+    popup_->SetOpacity(opacity);
+  }
+
+  return is_visible;
+}
+
+bool RadialMenuItemVisual::IsSeparator() {
+  return (popup_ == NULL ? true : false);
+}
+
+double RadialMenuItemVisual::RelativeSize() {
+  return size_.get() ? size_->GetCurrentValue() : 1.0;
+}
+
+void RadialMenuItemVisual::CreateWedgeImage() {
+  wedge_image_ = new SkBitmap();
+  wedge_image_->setConfig(SkBitmap::kARGB_8888_Config,
+                          bounds_.width(),
+                          bounds_.height());
+  wedge_image_->allocPixels();
+  SkCanvas canvas(*wedge_image_);
+  // Clear the bitmap fully transparent.
+  canvas.drawColor(kTransparentBlack);
+
+  // Draw the wedge.
+  SkRect bounds;
+  // Note: xMid and yMid does not need to be the outer_radius if there is a
+  // smooth shadow involved below the wedges.
+  double radians = (center_degree_ + 90) * M_PI / 180.0;
+  int xMid = bounds_.width() / 2 + sin(radians) * 2 * stroke_width_;
+  int yMid = bounds_.height() / 2 - cos(radians) * 2 * stroke_width_;
+  bounds.set(xMid - outer_radius_, yMid - outer_radius_,
+      xMid + outer_radius_, yMid + outer_radius_);
+
+  SkPaint paint;
+  paint.setColor(kStrokeColor);
+  paint.setAntiAlias(true);
+  paint.setStyle(SkPaint::kFill_Style);
+
+  // A gradient background image, First point: top, second point: bottom.
+  const SkPoint pts[] = { { 0, 0 }, { 0, bounds_.height() } };
+  const SkColor colors[] = { kUpperGradient, kLowerGradient };
+  SkShader* shader = SkGradientShader::CreateLinear(
+      pts, colors, NULL, 2, SkShader::kClamp_TileMode);
+  paint.setShader(shader);
+  shader->unref();
+  canvas.drawArc(bounds,
+                 center_degree_ - span_degrees_ / 2,
+                 span_degrees_,
+                 true,
+                 paint);
+
+  paint.setStyle(SkPaint::kStroke_Style);
+  paint.setStrokeWidth(stroke_width_);
+  paint.setShader(NULL);
+  canvas.drawArc(bounds,
+                 center_degree_ - span_degrees_ / 2,
+                 span_degrees_,
+                 true,
+                 paint);
+
+  // Erase the inner portion of the wedge again.
+  if (inner_radius_) {
+    // Erase inner wedge - need to use clear mode to get rid of alpha.
+    paint.setXfermodeMode(SkXfermode::kClear_Mode);
+    paint.setStyle(SkPaint::kStrokeAndFill_Style);
+    paint.setColor(kTransparentBlack);
+    paint.setAntiAlias(false);
+    // Adjust our target area (keep part of the stroke area).
+    // This is necessary to get the antialiased alpha pixels correct.
+    bounds.set(xMid - inner_radius_ + stroke_width_ / 2,
+               yMid - inner_radius_ + stroke_width_ / 2,
+               xMid + inner_radius_ - stroke_width_ / 2,
+               yMid + inner_radius_ - stroke_width_ / 2);
+    // Extend span range to get rid of anti aliased pixels.
+    canvas.drawArc(bounds,
+                   center_degree_ - span_degrees_ / 2 - 5,
+                   span_degrees_ + 10,
+                   true,
+                   paint);
+
+    // To eliminate antialiased pixels in center area, we draw a tiny circle.
+    int clear_radius = 2 * stroke_width_;
+    if (inner_radius_ < clear_radius)
+      clear_radius = inner_radius_;
+    bounds.set(xMid - clear_radius, yMid - clear_radius,
+               xMid + clear_radius, yMid + clear_radius);
+    paint.setStyle(SkPaint::kFill_Style);
+    canvas.drawArc(bounds, 0, 360, true, paint);
+
+    // Draw the inner stroke to fill the outline.
+    paint.setStyle(SkPaint::kStroke_Style);
+    paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
+    paint.setColor(kStrokeColor);
+    paint.setAntiAlias(true);
+    bounds.set(xMid - inner_radius_, yMid - inner_radius_,
+        xMid + inner_radius_, yMid + inner_radius_);
+    canvas.drawArc(bounds,
+                   center_degree_ - span_degrees_ / 2,
+                   span_degrees_,
+                   false,
+                   paint);
+  }
+  if (presentation_info_->Icon()) {
+    // Draw the action icon into the wedge.
+    SkPaint bitmap_paint;
+    bitmap_paint.setFilterBitmap(true);
+    bitmap_paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
+    GetIconBounds(bounds, xMid, yMid, radians);
+    canvas.drawBitmapRect(
+        *(presentation_info_->Icon()->bitmap()), NULL, bounds, &bitmap_paint);
+  }
+};
+
+void RadialMenuItemVisual::GetIconBounds(
+    SkRect& bounds, int xMid, int yMid, double radians) {
+  // Get the mid point for the image for this wedge.
+  int xMidIcon = xMid + sin(radians) * (inner_radius_ + outer_radius_) / 2;
+  int yMidIcon = yMid - cos(radians) * (inner_radius_ + outer_radius_) / 2;
+
+  // Determine the size of the image.
+  //                                                               ___
+  // Assume we are looking at the wedge as it stands up like this: \_/
+  // There are two size limiting factors:
+  // 1. The height as given by the inner and outer radius.
+  int size_radius = outer_radius_ - inner_radius_;
+  // 2. The width as given by the wedge "degree span". For simplicity we ignore
+  //    the fact that the wedge will be wider at the top then at the bottom.
+  double half_width = sin(span_degrees_ / 2 * M_PI / 180.0);
+  int size_midpoint = static_cast<int>(half_width * 2 *
+      (outer_radius_ + inner_radius_) / 2);
+  // Taking the minimum size we have found.
+  int size = ((size_midpoint < size_radius) ? size_midpoint : size_radius);
+  // Shrink this to three fourths to compensate for the shape and give spacing.
+  size = (3 * size) / 4;
+  int native_width = presentation_info_->Icon()->width();
+  int native_height = presentation_info_->Icon()->height();
+  double aspect = static_cast<double>(native_width) /
+      static_cast<double>(native_height);
+  // Finally we do not want to grow the image bigger then 2x its actual size.
+  if (size > 2 * native_width)
+    size = 2 * native_width;
+  if (size > 2 * native_height)
+    size = 2 * native_height;
+  // Calculate the size to use taking the size as the maximum dimension and
+  // using the aspect.
+  int height = size;
+  int width = size;
+  if (aspect >= 1.0)
+    height /= aspect;
+  else
+    width *= aspect;
+  bounds.set(xMidIcon - width / 2, yMidIcon - height / 2,
+      xMidIcon + width / 2, yMidIcon + height / 2);
+}
+
+// The implementation of the radial menu.
+class RadialMenuImpl : public RadialMenu {
+ public:
+  explicit RadialMenuImpl(const gfx::Point& location,
+                          int outer_radius,
+                          int inner_radius,
+                          double rotation,
+                          const RadialMenuItems items,
+                          int pointer_activation_area_extension);
+
+  // Set the item with |index| to be the element which is active
+  // (e.g. get hovered over).
+  void SetActiveItem(int index);
+
+  // Radial Menu implementation.
+  virtual void CloseAndDelete(bool immediate_close) OVERRIDE;
+  virtual bool HitMenuItemTest(
+      const gfx::Point& location, int* item, int* count) OVERRIDE;
+  virtual aura::Window* GetWindow() OVERRIDE;
+  virtual void set_pointer_activation_area_extension(int expansion) OVERRIDE {
+    pointer_activation_area_extension_ = expansion;
+  }
+
+  static RadialMenu* CreateRadialMenuInstance(
+      const gfx::Point& location,
+      int outer_radius,
+      int inner_radius,
+      double rotation,
+      const RadialMenuItems items) OVERRIDE;
+  static RadialMenuItem* CreateRadialMenuItemInstance(
+      RadialMenuItem::RadialMenuItemType type,
+      gfx::ImageSkia* icon,
+      bool delete_icon) OVERRIDE;
+
+ private:
+  ~RadialMenuImpl();
+
+  // Updates the menu over time to the correct state.
+  // (e.g. show / hide / hover / ..)
+  void PeriodicAnimateMenu();
+
+  // Update the current time relative to the creation time.
+  void UpdateCurrentTime();
+
+  // This are all menu items. The item at index 0 is the top most and then
+  // they rotate clockwise from there.
+  std::vector<RadialMenuItemVisual*> items_;
+
+  // The screen location of the entire menu.
+  gfx::Rect bounds_;
+
+  // The outer and inner radius of the menu.
+  int outer_radius_;
+  int inner_radius_;
+  int stroke_width_;
+  // The whole menu got rotated by this many degrees.
+  int rotation_;
+
+  // The timer which is used for our events.
+  base::RepeatingTimer<RadialMenuImpl> timer_;
+
+  // The timer "interrupt" can be very imprecise. As such the correct time
+  // gets calculated on use.
+  double current_time_;
+  const base::TimeTicks start_time_;
+
+  // When the menu gets gradually removed from the screen this is true.
+  bool delete_in_progress_;
+  // When the menu deletion is performed this is true. This is put here to
+  // avoid asynchronous animation calls coming in.
+  bool deleting_now_;
+
+  // If true the pointer needs to go exactly over the button to activate,
+  // otherwise anything over or behind the button is fine.
+  int pointer_activation_area_extension_;
+
+  // The active item. A negative value means that none is active.
+  int active_item_;
+
+  DISALLOW_COPY_AND_ASSIGN(RadialMenuImpl);
+};
+
+RadialMenuImpl::RadialMenuImpl(const gfx::Point& location,
+                             int outer_radius,
+                             int inner_radius,
+                             double rotation,
+                             const RadialMenuItems items,
+                             int pointer_activation_area_extension)
+    : outer_radius_(outer_radius),
+      inner_radius_(inner_radius),
+      stroke_width_(kStrokeWidth),
+      rotation_(rotation),
+      current_time_(0.0),
+      start_time_(base::TimeTicks::Now()),
+      delete_in_progress_(false),
+      deleting_now_(false),
+      pointer_activation_area_extension_(pointer_activation_area_extension),
+      active_item_(-1) {
+  // We use 3 times the stroke width for: 1x for the stroke itself and 2x
+  // to offset the wedges of each other (so that they don't touch).
+  bounds_ = gfx::Rect(location.x() - outer_radius_ - 3 * stroke_width_,
+                      location.y() - outer_radius_ - 3 * stroke_width_,
+                      2 * (outer_radius_ + 3 * stroke_width_),
+                      2 * (outer_radius_ + 3 * stroke_width_));
+  // Each item spans this amount of degrees:
+  double circular_span = 360.0 / items.size();
+  // We rotate the menu negative 90 degrees so that the first item is at the
+  // top.
+  rotation -= 90;
+  // Populate the menu with items.
+  for (size_t i = 0; i < items.size(); i++) {
+    // Update the time since considerable time could have already passed.
+    UpdateCurrentTime();
+    // Note: The -90 is to rotate the first segment to the top.
+    items_.push_back(new RadialMenuItemVisual(items[i],
+                                              current_time_,
+                                              bounds_,
+                                              inner_radius_,
+                                              outer_radius_,
+                                              stroke_width_,
+                                              i * circular_span + rotation,
+                                              circular_span));
+  }
+
+  // Ping the animation code once to initialize.
+  PeriodicAnimateMenu();
+
+  // Kick off our periodic timer to animate the menu.
+  timer_.Start(FROM_HERE,
+               base::TimeDelta::FromMilliseconds(1000 / kFrameRateHz),
+               this,
+               &RadialMenuImpl::PeriodicAnimateMenu);
+}
+
+void RadialMenuImpl::SetActiveItem(int index) {
+  DCHECK(index < static_cast<unsigned char>(items_.size()));
+  if (delete_in_progress_ || index == active_item_)
+    return;
+
+  if (active_item_ >= 0)
+    items_[active_item_]->ShowMenuItem();
+
+  active_item_ = index;
+
+  if (active_item_ >= 0)
+    items_[active_item_]->SetMenuItemActive();
+}
+
+void RadialMenuImpl::CloseAndDelete(bool immediate_close) {
+  if (delete_in_progress_)
+    return;
+
+  delete_in_progress_ = true;
+
+  if (immediate_close) {
+    delete this;
+  } else {
+    // Fade away all segments of the menu. Once they are gone the menu will
+    // destroy itself.
+    for (size_t i = 0; i < items_.size(); i++)
+      items_[i]->HideMenuItem();
+  }
+}
+
+bool RadialMenuImpl::HitMenuItemTest(
+    const gfx::Point& location, int* returned_item, int* returned_count) {
+  if (delete_in_progress_)
+    return false;
+
+  // Get the mid point.
+  double x = bounds_.x() + bounds_.width() / 2;
+  double y = bounds_.y() + bounds_.height() / 2;
+  // The distance of the coordinates.
+  double dx = x - location.x();
+  double dy = y - location.y();
+
+  double distance = sqrt(dx * dx + dy * dy);
+  if (distance < inner_radius_) {
+    SetActiveItem(-1);
+    return false;
+  }
+  int segments = items_.size();
+  // Get the rotation of the point around the mid point.
+  double degree = atan2(dy, dx) * 180 / M_PI;
+  // The segments are offsetted by three rotations:
+  // - 90 degree rotation to get the first element to the top.
+  // - half a segment width to get to the start of the segment
+  // + the callers rotation
+  double first_start_offset = 90 - 360 / segments / 2 + rotation_;
+  // Offset the retrieved rotation and limit it to positive degrees [0..360].
+  int adjusted_degree =
+      static_cast<int>(3600 + degree - first_start_offset) % 360;
+  int item = adjusted_degree / (360 / segments);
+  // For normal buttons we want to only activate it when over the button.
+  // For sliders we want to have the width a bit wider (thus two times the
+  // with of a wedge circle).
+  int step_width = (items_[item]->type() == RadialMenuItem::RADIAL_SLIDER) ?
+      (2 * (outer_radius_ - inner_radius_)) : (outer_radius_ - inner_radius_);
+  // We need to adjust the size relative to the size of the wedge.
+  distance /= items_[item]->RelativeSize();
+  int count = ceil((distance - inner_radius_) / step_width);
+  if (items_[item]->type() == RadialMenuItem::RADIAL_SLIDER) {
+    // TODO(skuhne): Sliders are currently expected to be left / right only.
+    // This can be changed by calculating the distance projected onto the moving
+    // axis.
+    DCHECK((static_cast<int>(items_[item]->center_degree()) + 360) % 180 == 90);
+    if (distance < outer_radius_)
+      items_[item]->SetSliderOffset(gfx::Point(0, 0));
+    else
+      items_[item]->SetSliderOffset(
+          gfx::Point(-(dx + (dx < 0 ? outer_radius_ : -outer_radius_)), 0));
+  }
+  if (items_[item]->IsSeparator() ||
+      items_[item]->type() == RadialMenuItem::RADIAL_DISABLED ||
+      (count > pointer_activation_area_extension_ &&
+       items_[item]->type() != RadialMenuItem::RADIAL_SLIDER)) {
+    SetActiveItem(-1);
+    return false;
+  }
+  SetActiveItem(item);
+  // Transfer the found return information.
+  *returned_item = item;
+  if (items_[item]->type() == RadialMenuItem::RADIAL_SLIDER) {
+    int last_distance = 0;
+    int last_count = 0;
+    items_[item]->GetLastSliderValue(last_count, last_distance);
+    if (last_count != count) {
+      // To avoid value jittering we only accept changes with more then half
+      // step delta.
+      if (abs(last_distance - distance) < step_width / 2 && count)
+        count = last_count;
+      else
+        items_[item]->SetLastSliderValue(count, distance);
+    }
+    *returned_count = count;
+  }
+  return true;
+}
+
+RadialMenuImpl::~RadialMenuImpl() {
+  timer_.Stop();
+  // Delete all menu item related resources.
+  while (items_.size()) {
+    RadialMenuItemVisual* item = items_.back();
+    items_.pop_back();
+    delete item;
+  }
+}
+
+void RadialMenuImpl::PeriodicAnimateMenu() {
+  if (deleting_now_)
+    return;
+
+  // Since the interrupt is not really happening in "the accurate time", the
+  // time needs to get calculated here.
+  UpdateCurrentTime();
+
+  // We need to check if the menu is still at least partially visible.
+  // This is required for self destruction when we were asked to shut down.
+  bool is_visible = false;
+
+  for (size_t i = 0; i < items_.size(); i++)
+    is_visible |= items_[i]->AdvanceTime(current_time_);
+
+  if (delete_in_progress_ && !is_visible) {
+    deleting_now_ = true;
+    delete this;
+  }
+}
+
+void RadialMenuImpl::UpdateCurrentTime() {
+  current_time_ = (base::TimeTicks::Now() - start_time_).InSecondsF();
+}
+
+aura::Window* RadialMenuImpl::GetWindow() {
+  for (size_t i = 0; i < items_.size(); i++) {
+    if (items_[i]->GetWindow())
+      return items_[i]->GetWindow();
+  }
+  return NULL;
+}
+
+// The class which represents the menu item structure which assembles the menu.
+class RadialMenuItemImpl: public RadialMenuItem {
+ public:
+  RadialMenuItemImpl(
+      RadialMenuItemType type, gfx::ImageSkia* icon, bool delete_icon);
+
+  virtual RadialMenuItemType Type() OVERRIDE { return type_; }
+  virtual gfx::ImageSkia* Icon() OVERRIDE { return icon_; }
+  virtual bool DeleteIcon() OVERRIDE {return delete_icon_; }
+
+  virtual ~RadialMenuItemImpl();
+
+ private:
+  // The type of the menu.
+  RadialMenuItemType type_;
+  // The image to use for this item.
+  gfx::ImageSkia* icon_;
+  // If true, the icon should get deleted on destruction.
+  bool delete_icon_;
+};
+
+RadialMenuItemImpl::RadialMenuItemImpl(
+    RadialMenuItemType type, gfx::ImageSkia* icon, bool delete_icon)
+    : type_(type),
+      icon_(icon),
+      delete_icon_(delete_icon) {}
+
+RadialMenuItemImpl::~RadialMenuItemImpl() {
+  if (delete_icon_ && icon_)
+    delete icon_;
+}
+
+}  // namespace
+
+// static
+RadialMenu* RadialMenu::CreateRadialMenuInstance(
+    const gfx::Point& location,
+    int outer_radius,
+    int inner_radius,
+    double rotation,
+    const RadialMenuItems items,
+    int pointer_activation_area_extension,
+    bool clip_menu_to_screen) {
+  DCHECK(pointer_activation_area_extension >= 1);
+  int min_radius = outer_radius;
+  if (clip_menu_to_screen) {
+    // Check that the menu stays within the visible screen by resizing if
+    // necessary.
+    gfx::Rect screen = gfx::Screen::GetDisplayNearestPoint(location).bounds();
+    if (location.x() - screen.x() < min_radius)
+      min_radius = location.x() - screen.x();
+    if (location.y() - screen.y() < min_radius)
+      min_radius = location.y() - screen.y();
+    if (screen.right() - location.x() < min_radius)
+      min_radius = screen.right() - location.x();
+    if (screen.bottom() - location.y() < min_radius)
+      min_radius = screen.bottom() - location.y();
+    if (min_radius < 48)
+      min_radius = 48;
+    inner_radius = (inner_radius * min_radius) / outer_radius;
+  }
+
+  // The animation will delete itself when it's finished or when the tab
+  // contents is hidden or destroyed.
+  return new RadialMenuImpl(
+      location,
+      min_radius,
+      inner_radius,
+      rotation,
+      items,
+      pointer_activation_area_extension);
+}
+
+// static
+RadialMenuItem* RadialMenuItem::CreateRadialMenuItemInstance(
+    RadialMenuItem::RadialMenuItemType type,
+    gfx::ImageSkia* icon,
+    bool delete_icon) {
+  return new RadialMenuItemImpl(type, icon, delete_icon);
+}
+
+}  // namespace views