blob: 2937ba6e5af8a8ac895e8608584f6c6ee779b566 [file] [log] [blame]
// Copyright 2013 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/components/tap_visualizer/tap_renderer.h"
#include "base/logging.h"
#include "base/time/time.h"
#include "cc/paint/paint_flags.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_owner.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/view.h"
#include "ui/views/widget/widget.h"
#include "ui/views/widget/widget_observer.h"
namespace tap_visualizer {
const int kPointRadius = 20;
const SkColor kProjectionFillColor = SkColorSetRGB(0xF5, 0xF5, 0xDC);
const SkColor kProjectionStrokeColor = SK_ColorGRAY;
const int kProjectionAlpha = 0xB0;
constexpr base::TimeDelta kFadeoutDuration =
base::TimeDelta::FromMilliseconds(250);
const int kFadeoutFrameRate = 60;
// TouchPointView draws a single touch point. Owned by the views hierarchy.
// Deletes itself upon fade-out completion.
class TouchPointView : public views::View, public gfx::AnimationDelegate {
public:
TouchPointView()
: circle_center_(kPointRadius + 1, kPointRadius + 1),
gradient_center_(SkPoint::Make(kPointRadius + 1, kPointRadius + 1)) {
SetPaintToLayer();
layer()->SetFillsBoundsOpaquely(false);
SetSize(gfx::Size(2 * kPointRadius + 2, 2 * kPointRadius + 2));
stroke_flags_.setStyle(cc::PaintFlags::kStroke_Style);
stroke_flags_.setColor(kProjectionStrokeColor);
gradient_colors_[0] = kProjectionFillColor;
gradient_colors_[1] = kProjectionStrokeColor;
gradient_pos_[0] = SkFloatToScalar(0.9f);
gradient_pos_[1] = SkFloatToScalar(1.0f);
}
void UpdateTouch(const ui::PointerEvent& touch) {
if (touch.type() == ui::ET_POINTER_UP ||
touch.type() == ui::ET_POINTER_CANCELLED) {
fadeout_.reset(
new gfx::LinearAnimation(kFadeoutDuration, kFadeoutFrameRate, this));
fadeout_->Start();
} else {
SetX(parent()->GetMirroredXInView(touch.root_location().x()) -
kPointRadius - 1);
SetY(touch.root_location().y() - kPointRadius - 1);
}
}
// Destroys the view, which removes it from its parent.
void Destroy() { delete this; }
private:
~TouchPointView() override = default;
// Overridden from views::View.
void OnPaint(gfx::Canvas* canvas) override {
int alpha = kProjectionAlpha;
if (fadeout_)
alpha = static_cast<int>(fadeout_->CurrentValueBetween(alpha, 0));
fill_flags_.setAlpha(alpha);
stroke_flags_.setAlpha(alpha);
fill_flags_.setShader(cc::PaintShader::MakeRadialGradient(
gradient_center_, SkIntToScalar(kPointRadius), gradient_colors_,
gradient_pos_, arraysize(gradient_colors_),
SkShader::kMirror_TileMode));
canvas->DrawCircle(circle_center_, SkIntToScalar(kPointRadius),
fill_flags_);
canvas->DrawCircle(circle_center_, SkIntToScalar(kPointRadius),
stroke_flags_);
}
// 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);
}
const gfx::Point circle_center_;
const SkPoint gradient_center_;
cc::PaintFlags fill_flags_;
cc::PaintFlags stroke_flags_;
SkColor gradient_colors_[2];
SkScalar gradient_pos_[2];
std::unique_ptr<gfx::Animation> fadeout_;
DISALLOW_COPY_AND_ASSIGN(TouchPointView);
};
TapRenderer::TapRenderer(std::unique_ptr<views::Widget> widget)
: widget_(std::move(widget)) {
DCHECK(widget_);
}
TapRenderer::~TapRenderer() = default;
void TapRenderer::HandleTouchEvent(const ui::PointerEvent& event) {
DCHECK(event.IsTouchPointerEvent());
const int id = event.pointer_details().id;
if (event.type() == ui::ET_POINTER_DOWN) {
TouchPointView* point = new TouchPointView();
widget_->GetContentsView()->AddChildView(point);
point->UpdateTouch(event);
std::pair<std::map<int, TouchPointView*>::iterator, bool> result =
points_.insert(std::make_pair(id, point));
// If a |TouchPointView| is already mapped to the touch id, destroy it and
// replace it with the new one.
if (!result.second) {
result.first->second->Destroy();
result.first->second = point;
}
} else {
std::map<int, TouchPointView*>::iterator iter = points_.find(id);
if (iter != points_.end()) {
iter->second->UpdateTouch(event);
if (event.type() == ui::ET_POINTER_UP ||
event.type() == ui::ET_POINTER_CANCELLED) {
points_.erase(iter);
// View will fade out then delete itself.
}
}
}
}
} // namespace tap_visualizer