ash: Refactor touch hud drawing to ash/touch_hud as a separate component.

ash/touch/touch_hud_projection.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
+// 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 "ash/touch/touch_hud_projection.h"
 
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
-#include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/events/event.h"
-#include "ui/gfx/animation/animation_delegate.h"
-#include "ui/gfx/animation/linear_animation.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/geometry/size.h"
+#include "ui/views/controls/touch/touch_hud_drawer.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 
-const int kPointRadius = 20;
-const SkColor kProjectionFillColor = SkColorSetRGB(0xF5, 0xF5, 0xDC);
-const SkColor kProjectionStrokeColor = SK_ColorGRAY;
-const int kProjectionAlpha = 0xB0;
-const int kFadeoutDurationInMs = 250;
-const int kFadeoutFrameRate = 60;
-
-// TouchPointView draws a single touch point. This object manages its own
-// lifetime and deletes itself upon fade-out completion or whenever |Remove()|
-// is explicitly called.
-class TouchPointView : public views::View,
-                       public gfx::AnimationDelegate,
-                       public views::WidgetObserver {
- public:
-  explicit TouchPointView(views::Widget* parent_widget)
-      : circle_center_(kPointRadius + 1, kPointRadius + 1),
-        gradient_center_(SkPoint::Make(kPointRadius + 1, kPointRadius + 1)) {
-    SetPaintToLayer(true);
-    layer()->SetFillsBoundsOpaquely(false);
-
-    SetSize(gfx::Size(2 * kPointRadius + 2, 2 * kPointRadius + 2));
-
-    stroke_paint_.setStyle(SkPaint::kStroke_Style);
-    stroke_paint_.setColor(kProjectionStrokeColor);
-
-    gradient_colors_[0] = kProjectionFillColor;
-    gradient_colors_[1] = kProjectionStrokeColor;
-
-    gradient_pos_[0] = SkFloatToScalar(0.9f);
-    gradient_pos_[1] = SkFloatToScalar(1.0f);
-
-    parent_widget->GetContentsView()->AddChildView(this);
-
-    parent_widget->AddObserver(this);
-  }
-
-  void UpdateTouch(const ui::TouchEvent& touch) {
-    if (touch.type() == ui::ET_TOUCH_RELEASED ||
-        touch.type() == ui::ET_TOUCH_CANCELLED) {
-      fadeout_.reset(new gfx::LinearAnimation(kFadeoutDurationInMs,
-                                              kFadeoutFrameRate, this));
-      fadeout_->Start();
-    } else {
-      SetX(parent()->GetMirroredXInView(touch.root_location().x()) -
-           kPointRadius - 1);
-      SetY(touch.root_location().y() - kPointRadius - 1);
-    }
-  }
-
-  void Remove() { delete this; }
-
- private:
-  ~TouchPointView() override {
-    GetWidget()->RemoveObserver(this);
-    parent()->RemoveChildView(this);
-  }
-
-  // Overridden from views::View.
-  void OnPaint(gfx::Canvas* canvas) override {
-    int alpha = kProjectionAlpha;
-    if (fadeout_)
-      alpha = static_cast<int>(fadeout_->CurrentValueBetween(alpha, 0));
-    fill_paint_.setAlpha(alpha);
-    stroke_paint_.setAlpha(alpha);
-    fill_paint_.setShader(SkGradientShader::MakeRadial(
-        gradient_center_, SkIntToScalar(kPointRadius), gradient_colors_,
-        gradient_pos_, arraysize(gradient_colors_),
-        SkShader::kMirror_TileMode));
-    canvas->DrawCircle(circle_center_, SkIntToScalar(kPointRadius),
-                       fill_paint_);
-    canvas->DrawCircle(circle_center_, SkIntToScalar(kPointRadius),
-                       stroke_paint_);
-  }
-
-  // Overridden from gfx::AnimationDelegate.
-  void AnimationEnded(const gfx::Animation* animation) override {
-    DCHECK_EQ(fadeout_.get(), animation);
-    delete this;
-  }
-
-  void AnimationProgressed(const gfx::Animation* animation) override {
-    DCHECK_EQ(fadeout_.get(), animation);
-    SchedulePaint();
-  }
-
-  void AnimationCanceled(const gfx::Animation* animation) override {
-    AnimationEnded(animation);
-  }
-
-  // Overridden from views::WidgetObserver.
-  void OnWidgetDestroying(views::Widget* widget) override {
-    if (fadeout_)
-      fadeout_->Stop();
-    else
-      Remove();
-  }
-
-  const gfx::Point circle_center_;
-  const SkPoint gradient_center_;
-
-  SkPaint fill_paint_;
-  SkPaint stroke_paint_;
-  SkColor gradient_colors_[2];
-  SkScalar gradient_pos_[2];
-
-  std::unique_ptr<gfx::Animation> fadeout_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchPointView);
-};
-
 TouchHudProjection::TouchHudProjection(aura::Window* initial_root)
-    : TouchObserverHUD(initial_root) {}
+    : TouchObserverHUD(initial_root) {
+  touch_hud_drawer_ = views::TouchHudDrawer::Get();
+}
 
 TouchHudProjection::~TouchHudProjection() {}
 
 void TouchHudProjection::Clear() {
-  for (std::map<int, TouchPointView*>::iterator iter = points_.begin();
-       iter != points_.end(); iter++)
-    iter->second->Remove();
-  points_.clear();
+  touch_hud_drawer_->Clear();
 }
 
 void TouchHudProjection::OnTouchEvent(ui::TouchEvent* event) {
-  if (event->type() == ui::ET_TOUCH_PRESSED) {
-    TouchPointView* point = new TouchPointView(widget());
-    point->UpdateTouch(*event);
-    std::pair<std::map<int, TouchPointView*>::iterator, bool> result =
-        points_.insert(std::make_pair(event->touch_id(), point));
-    // If a |TouchPointView| is already mapped to the touch id, remove it and
-    // replace it with the new one.
-    if (!result.second) {
-      result.first->second->Remove();
-      result.first->second = point;
-    }
-  } else {
-    std::map<int, TouchPointView*>::iterator iter =
-        points_.find(event->touch_id());
-    if (iter != points_.end()) {
-      iter->second->UpdateTouch(*event);
-      if (event->type() == ui::ET_TOUCH_RELEASED ||
-          event->type() == ui::ET_TOUCH_CANCELLED)
-        points_.erase(iter);
-    }
-  }
+  touch_hud_drawer_->HandleTouchEvent(event, widget());
 }
 
 void TouchHudProjection::SetHudForRootWindowController(
     RootWindowController* controller) {
   controller->set_touch_hud_projection(this);
 }
 
 void TouchHudProjection::UnsetHudForRootWindowController(
     RootWindowController* controller) {
   controller->set_touch_hud_projection(NULL);
 }
 
 }  // namespace ash