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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/accessibility/ui/focus_ring_layer.h"
#include "ash/accessibility/ui/accessibility_layer.h"
#include "ui/aura/window.h"
#include "ui/compositor/compositor_animation_observer.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/paint_recorder.h"
#include "ui/display/display.h"
#include "ui/display/screen.h"
#include "ui/gfx/canvas.h"
namespace ui {
class Compositor;
}
namespace ash {
namespace {
const int kShadowRadius = 10;
const int kShadowAlpha = 90;
const SkColor kShadowColor = SkColorSetRGB(77, 144, 254);
} // namespace
FocusRingLayer::FocusRingLayer(AccessibilityLayerDelegate* delegate)
: AccessibilityLayer(delegate) {}
FocusRingLayer::~FocusRingLayer() = default;
void FocusRingLayer::SetColor(SkColor color) {
custom_color_ = color;
}
void FocusRingLayer::ResetColor() {
custom_color_.reset();
}
int FocusRingLayer::GetInset() const {
return kShadowRadius + 2;
}
void FocusRingLayer::OnPaintLayer(const ui::PaintContext& context) {
if (!root_window_ || layer_rect_.IsEmpty())
return;
ui::PaintRecorder recorder(context, layer_->size());
cc::PaintFlags flags;
flags.setAntiAlias(true);
flags.setColor(custom_color_ ? *custom_color_ : kShadowColor);
flags.setStyle(cc::PaintFlags::kStroke_Style);
flags.setStrokeWidth(2);
gfx::Rect bounds = layer_rect_ - layer_->bounds().OffsetFromOrigin();
int r = kShadowRadius;
for (int i = 0; i < r; i++) {
// Fade out alpha quadratically.
flags.setAlphaf((kShadowAlpha * (r - i) * (r - i)) / (r * r) / 255.0f);
gfx::Rect outsetRect = bounds;
outsetRect.Inset(-i);
recorder.canvas()->DrawRect(outsetRect, flags);
}
}
} // namespace ash
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