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// 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/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/size.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);
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);
SkShader* shader = SkGradientShader::CreateRadial(
gradient_center_,
SkIntToScalar(kPointRadius),
gradient_colors_,
gradient_pos_,
arraysize(gradient_colors_),
SkShader::kMirror_TileMode);
fill_paint_.setShader(shader);
shader->unref();
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];
scoped_ptr<gfx::Animation> fadeout_;
DISALLOW_COPY_AND_ASSIGN(TouchPointView);
};
TouchHudProjection::TouchHudProjection(aura::Window* initial_root)
: TouchObserverHUD(initial_root) {
}
TouchHudProjection::~TouchHudProjection() {
}
void TouchHudProjection::Clear() {
for (std::map<int, TouchPointView*>::iterator iter = points_.begin();
iter != points_.end(); iter++)
iter->second->Remove();
points_.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);
}
}
}
void TouchHudProjection::SetHudForRootWindowController(
RootWindowController* controller) {
controller->set_touch_hud_projection(this);
}
void TouchHudProjection::UnsetHudForRootWindowController(
RootWindowController* controller) {
controller->set_touch_hud_projection(NULL);
}
} // namespace ash
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