ash: Refactor autoclick common code to ash/autoclick/common.

ash/autoclick/common/autoclick_ring_handler.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 "chrome/browser/chromeos/ui/autoclick_ring_handler.h"
+#include "ash/autoclick/common/autoclick_ring_handler.h"
 
-#include <memory>
-
-#include "ash/aura/wm_window_aura.h"
-#include "ash/common/shell_window_ids.h"
-#include "ash/common/wm/root_window_finder.h"
-#include "ash/root_window_controller.h"
-#include "ash/shell.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRect.h"
-#include "ui/aura/client/screen_position_client.h"
-#include "ui/aura/env.h"
 #include "ui/aura/window.h"
-#include "ui/aura/window_event_dispatcher.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/transform.h"
 #include "ui/views/view.h"
-#include "ui/views/widget/widget.h"
-#include "ui/wm/core/coordinate_conversion.h"
 
-namespace chromeos {
+namespace ash {
 namespace {
 
 const int kAutoclickRingOuterRadius = 30;
 const int kAutoclickRingInnerRadius = 20;
 
 // Angles from x-axis at which the outer and inner circles start.
 const int kAutoclickRingInnerStartAngle = -90;
 
 const int kAutoclickRingGlowWidth = 20;
 // The following is half width to avoid division by 2.
 const int kAutoclickRingArcWidth = 2;
 
 // Start and end values for various animations.
 const double kAutoclickRingScaleStartValue = 1.0;
 const double kAutoclickRingScaleEndValue = 1.0;
 const double kAutoclickRingShrinkScaleEndValue = 0.5;
 
 const double kAutoclickRingOpacityStartValue = 0.1;
 const double kAutoclickRingOpacityEndValue = 0.5;
 const int kAutoclickRingAngleStartValue = -90;
 // The sweep angle is a bit greater than 360 to make sure the circle
 // completes at the end of the animation.
 const int kAutoclickRingAngleEndValue = 360;
 
 // Visual constants.
 const SkColor kAutoclickRingArcColor = SkColorSetARGB(255, 0, 255, 0);
 const SkColor kAutoclickRingCircleColor = SkColorSetARGB(255, 0, 0, 255);
 const int kAutoclickRingFrameRateHz = 60;
 
-views::Widget* CreateAutoclickRingWidget(aura::Window* root_window) {
-  views::Widget* widget = new views::Widget;
-  views::Widget::InitParams params;
-  params.type = views::Widget::InitParams::TYPE_WINDOW_FRAMELESS;
-  params.accept_events = false;
-  params.activatable = views::Widget::InitParams::ACTIVATABLE_NO;
-  params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
-  params.context = root_window;
-  params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
-  params.parent = ash::Shell::GetContainer(
-      root_window, ash::kShellWindowId_OverlayContainer);
-
-  widget->Init(params);
-  widget->SetOpacity(1.f);
-  return widget;
-}
-
 void PaintAutoclickRingCircle(gfx::Canvas* canvas,
                               gfx::Point& center,
                               int radius) {
   SkPaint paint;
   paint.setStyle(SkPaint::kStroke_Style);
   paint.setStrokeWidth(2 * kAutoclickRingArcWidth);
   paint.setColor(kAutoclickRingCircleColor);
   paint.setAntiAlias(true);
 
   canvas->DrawCircle(center, radius, paint);
@@ skipping 16 matching lines @@
                   start_angle, end_angle - start_angle);
   canvas->DrawPath(arc_path, paint);
 }
 }  // namespace
 
 // View of the AutoclickRingHandler. Draws the actual contents and updates as
 // the animation proceeds. It also maintains the views::Widget that the
 // animation is shown in.
 class AutoclickRingHandler::AutoclickRingView : public views::View {
  public:
-  AutoclickRingView(const gfx::Point& event_location, aura::Window* root_window)
+  AutoclickRingView(const gfx::Point& event_location,
+                    views::Widget* ring_widget)
       : views::View(),
-        widget_(CreateAutoclickRingWidget(root_window)),
+        widget_(ring_widget),
         current_angle_(kAutoclickRingAngleStartValue),
         current_scale_(kAutoclickRingScaleStartValue) {
     widget_->SetContentsView(this);
 
     // We are owned by the AutoclickRingHandler.
     set_owned_by_client();
-    SetNewLocation(event_location, root_window);
+    SetNewLocation(event_location);
   }
 
   ~AutoclickRingView() override {}
 
-  void SetNewLocation(const gfx::Point& new_event_location,
-                      aura::Window* root_window) {
+  void SetNewLocation(const gfx::Point& new_event_location) {
     gfx::Point point = new_event_location;
     widget_->SetBounds(gfx::Rect(
         point.x() - (kAutoclickRingOuterRadius + kAutoclickRingGlowWidth),
         point.y() - (kAutoclickRingOuterRadius + kAutoclickRingGlowWidth),
         GetPreferredSize().width(), GetPreferredSize().height()));
     widget_->Show();
     widget_->GetNativeView()->layer()->SetOpacity(
         kAutoclickRingOpacityStartValue);
   }
 
@@ skipping 41 matching lines @@
 
     // Paint inner circle.
     PaintAutoclickRingArc(canvas, center, kAutoclickRingInnerRadius,
                           kAutoclickRingInnerStartAngle, current_angle_);
     // Paint outer circle.
     PaintAutoclickRingCircle(canvas, center, kAutoclickRingOuterRadius);
 
     canvas->Restore();
   }
 
-  std::unique_ptr<views::Widget> widget_;
+  views::Widget* widget_;
   int current_angle_;
   double current_scale_;
 
   DISALLOW_COPY_AND_ASSIGN(AutoclickRingView);
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 
 // AutoclickRingHandler, public
 AutoclickRingHandler::AutoclickRingHandler()
     : gfx::LinearAnimation(kAutoclickRingFrameRateHz, nullptr),
-      tap_down_target_(nullptr),
+      ring_widget_(nullptr),
       current_animation_type_(AnimationType::NONE) {}
 
 AutoclickRingHandler::~AutoclickRingHandler() {
   StopAutoclickRing();
 }
 
 void AutoclickRingHandler::StartGesture(
     base::TimeDelta duration,
-    const gfx::Point& center_point_in_screen) {
-  aura::Window* target = GetTargetWindow();
-  if (tap_down_target_ && tap_down_target_ != target)
-    return;
+    const gfx::Point& center_point_in_screen,
+    views::Widget* widget) {
   StopAutoclickRing();
-  SetTapDownTarget();
   tap_down_location_ = center_point_in_screen;
+  ring_widget_ = widget;
   current_animation_type_ = AnimationType::GROW_ANIMATION;
   animation_duration_ = duration;
   StartAnimation(base::TimeDelta());
 }
 
 void AutoclickRingHandler::StopGesture() {
-  aura::Window* target = GetTargetWindow();
-  if (tap_down_target_ && tap_down_target_ != target)
-    return;
   StopAutoclickRing();
 }
 
 void AutoclickRingHandler::SetGestureCenter(
-    const gfx::Point& center_point_in_screen) {
+    const gfx::Point& center_point_in_screen,
+    views::Widget* widget) {
   tap_down_location_ = center_point_in_screen;
+  ring_widget_ = widget;
 }
 ////////////////////////////////////////////////////////////////////////////////
 
 // AutoclickRingHandler, private
-aura::Window* AutoclickRingHandler::GetTargetWindow() {
-  aura::Window* target = ash::WmWindowAura::GetAuraWindow(
-      ash::wm::GetRootWindowAt(tap_down_location_));
-  DCHECK(target) << "Root window not found while rendering autoclick circle;";
-  return target;
-}
-
-void AutoclickRingHandler::SetTapDownTarget() {
-  aura::Window* target = GetTargetWindow();
-  SetTapDownTarget(target);
-}
-
 void AutoclickRingHandler::StartAnimation(base::TimeDelta delay) {
-  int delay_ms = int{delay.InMilliseconds()};
+  int delay_ms = static_cast<int>(delay.InMilliseconds());
   switch (current_animation_type_) {
     case AnimationType::GROW_ANIMATION: {
-      aura::Window* root_window = tap_down_target_->GetRootWindow();
-      view_.reset(new AutoclickRingView(tap_down_location_, root_window));
+      view_.reset(new AutoclickRingView(tap_down_location_, ring_widget_));
       SetDuration(delay_ms);
       Start();
       break;
     }
     case AnimationType::SHRINK_ANIMATION: {
-      aura::Window* root_window = tap_down_target_->GetRootWindow();
-      view_.reset(new AutoclickRingView(tap_down_location_, root_window));
+      view_.reset(new AutoclickRingView(tap_down_location_, ring_widget_));
       SetDuration(delay_ms);
       Start();
       break;
     }
     case AnimationType::NONE:
       NOTREACHED();
       break;
   }
 }
 
 void AutoclickRingHandler::StopAutoclickRing() {
   // Since, Animation::Stop() calls AnimationStopped(), we need to reset the
   // |current_animation_type_| before Stop(), otherwise AnimationStopped() may
   // start the timer again.
   current_animation_type_ = AnimationType::NONE;
   Stop();
   view_.reset();
-  SetTapDownTarget(nullptr);
-}
-
-void AutoclickRingHandler::SetTapDownTarget(aura::Window* target) {
-  if (tap_down_target_ == target)
-    return;
-
-  if (tap_down_target_)
-    tap_down_target_->RemoveObserver(this);
-  tap_down_target_ = target;
-  if (tap_down_target_)
-    tap_down_target_->AddObserver(this);
 }
 
 void AutoclickRingHandler::AnimateToState(double state) {
   DCHECK(view_.get());
   switch (current_animation_type_) {
     case AnimationType::GROW_ANIMATION:
-      view_->SetNewLocation(tap_down_location_, GetTargetWindow());
+      view_->SetNewLocation(tap_down_location_);
       view_->UpdateWithGrowAnimation(this);
       break;
     case AnimationType::SHRINK_ANIMATION:
-      view_->SetNewLocation(tap_down_location_, GetTargetWindow());
+      view_->SetNewLocation(tap_down_location_);
       view_->UpdateWithShrinkAnimation(this);
       break;
     case AnimationType::NONE:
       NOTREACHED();
       break;
   }
 }
 
 void AutoclickRingHandler::AnimationStopped() {
   switch (current_animation_type_) {
     case AnimationType::GROW_ANIMATION:
       current_animation_type_ = AnimationType::SHRINK_ANIMATION;
       StartAnimation(animation_duration_);
       break;
     case AnimationType::SHRINK_ANIMATION:
       current_animation_type_ = AnimationType::NONE;
       break;
     case AnimationType::NONE:
       // fall through to reset the view.
       view_.reset();
-      SetTapDownTarget(nullptr);
       break;
   }
 }
 
-void AutoclickRingHandler::OnWindowDestroying(aura::Window* window) {
-  DCHECK_EQ(tap_down_target_, window);
-  StopAutoclickRing();
-}
-
-}  // namespace chromeos
+}  // namespace ash