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autoclick_ring_handler.cc
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autoclick_ring_handler.cc
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// 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/autoclick/autoclick_ring_handler.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkPath.h"
#include "third_party/skia/include/core/SkRect.h"
#include "ui/aura/window.h"
#include "ui/compositor/layer.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/transform.h"
#include "ui/views/view.h"
namespace ash {
namespace {
// The default values of the autoclick ring widget size.
const int kAutoclickRingInnerRadius = 20;
// The following is half width to avoid division by 2.
const int kAutoclickRingArcWidth = 2;
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;
// Constants for colors.
const SkColor kAutoclickRingArcColor = SkColorSetARGB(255, 255, 255, 255);
const SkColor kAutoclickRingCircleColor = SkColorSetARGB(128, 0, 0, 0);
const SkColor kAutoclickRingUnderArcColor = SkColorSetARGB(100, 128, 134, 139);
// Paints the full Autoclick ring.
void PaintAutoclickRing(gfx::Canvas* canvas,
const gfx::Point& center,
int radius,
int end_angle) {
cc::PaintFlags flags;
flags.setAntiAlias(true);
// Draw the point being selected.
flags.setStyle(cc::PaintFlags::kFill_Style);
flags.setColor(kAutoclickRingArcColor);
canvas->DrawCircle(center, kAutoclickRingArcWidth / 2, flags);
// Draw the outline of the point being selected.
flags.setStyle(cc::PaintFlags::kStroke_Style);
flags.setStrokeWidth(kAutoclickRingArcWidth);
flags.setColor(kAutoclickRingCircleColor);
canvas->DrawCircle(center, kAutoclickRingArcWidth * 3 / 2, flags);
// Draw the outline of the arc.
flags.setColor(kAutoclickRingCircleColor);
canvas->DrawCircle(center, radius + kAutoclickRingArcWidth, flags);
canvas->DrawCircle(center, radius - kAutoclickRingArcWidth, flags);
// Draw the background of the arc.
flags.setColor(kAutoclickRingUnderArcColor);
canvas->DrawCircle(center, radius, flags);
// Draw the arc.
SkPath arc_path;
arc_path.addArc(SkRect::MakeXYWH(center.x() - radius, center.y() - radius,
2 * radius, 2 * radius),
kAutoclickRingAngleStartValue,
end_angle - kAutoclickRingAngleStartValue);
flags.setStrokeWidth(kAutoclickRingArcWidth);
flags.setColor(kAutoclickRingArcColor);
canvas->DrawPath(arc_path, flags);
}
} // 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,
views::Widget* ring_widget,
int radius)
: views::View(),
widget_(ring_widget),
current_angle_(kAutoclickRingAngleStartValue),
radius_(radius) {
widget_->SetContentsView(this);
// We are owned by the AutoclickRingHandler.
set_owned_by_client();
SetLocation(event_location);
}
~AutoclickRingView() override = default;
void SetLocation(const gfx::Point& new_event_location) {
gfx::Point point = new_event_location;
widget_->SetBounds(
gfx::Rect(point.x() - (radius_ + kAutoclickRingArcWidth * 2),
point.y() - (radius_ + kAutoclickRingArcWidth * 2),
GetPreferredSize().width(), GetPreferredSize().height()));
widget_->Show();
widget_->GetNativeView()->layer()->SetOpacity(1.0);
}
void UpdateWithGrowAnimation(gfx::Animation* animation) {
// Update the portion of the circle filled so far and re-draw.
current_angle_ = animation->CurrentValueBetween(
kAutoclickRingAngleStartValue, kAutoclickRingAngleEndValue);
SchedulePaint();
}
void UpdateWithShrinkAnimation(gfx::Animation* animation) {
current_angle_ = animation->CurrentValueBetween(
kAutoclickRingAngleStartValue, kAutoclickRingAngleEndValue);
SchedulePaint();
}
void SetSize(int radius) { radius_ = radius; }
private:
// Overridden from views::View.
gfx::Size CalculatePreferredSize() const override {
return gfx::Size(2 * (radius_ + kAutoclickRingArcWidth * 2),
2 * (radius_ + kAutoclickRingArcWidth * 2));
}
void OnPaint(gfx::Canvas* canvas) override {
gfx::Point center(GetPreferredSize().width() / 2,
GetPreferredSize().height() / 2);
canvas->Save();
PaintAutoclickRing(canvas, center, radius_, current_angle_);
canvas->Restore();
}
views::Widget* widget_;
int current_angle_;
int radius_;
DISALLOW_COPY_AND_ASSIGN(AutoclickRingView);
};
////////////////////////////////////////////////////////////////////////////////
// AutoclickRingHandler, public
AutoclickRingHandler::AutoclickRingHandler()
: gfx::LinearAnimation(nullptr),
ring_widget_(nullptr),
current_animation_type_(AnimationType::NONE),
radius_(kAutoclickRingInnerRadius) {}
AutoclickRingHandler::~AutoclickRingHandler() {
StopAutoclickRing();
}
void AutoclickRingHandler::StartGesture(
base::TimeDelta duration,
const gfx::Point& center_point_in_screen,
views::Widget* widget) {
StopAutoclickRing();
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() {
StopAutoclickRing();
}
void AutoclickRingHandler::SetGestureCenter(
const gfx::Point& center_point_in_screen,
views::Widget* widget) {
tap_down_location_ = center_point_in_screen;
ring_widget_ = widget;
}
void AutoclickRingHandler::SetSize(int radius) {
radius_ = radius;
if (view_)
view_->SetSize(radius);
}
////////////////////////////////////////////////////////////////////////////////
// AutoclickRingHandler, private
void AutoclickRingHandler::StartAnimation(base::TimeDelta delay) {
switch (current_animation_type_) {
case AnimationType::GROW_ANIMATION: {
view_.reset(
new AutoclickRingView(tap_down_location_, ring_widget_, radius_));
SetDuration(delay);
Start();
break;
}
case AnimationType::SHRINK_ANIMATION: {
view_.reset(
new AutoclickRingView(tap_down_location_, ring_widget_, radius_));
SetDuration(delay);
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();
}
void AutoclickRingHandler::AnimateToState(double state) {
DCHECK(view_.get());
switch (current_animation_type_) {
case AnimationType::GROW_ANIMATION:
view_->SetLocation(tap_down_location_);
view_->UpdateWithGrowAnimation(this);
break;
case AnimationType::SHRINK_ANIMATION:
view_->SetLocation(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();
break;
}
}
} // namespace ash