| // 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/accessibility/focus_ring_layer.h" |
| #include "ash/accessibility/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() { |
| if (compositor_ && compositor_->HasAnimationObserver(this)) |
| compositor_->RemoveAnimationObserver(this); |
| } |
| |
| void FocusRingLayer::SetColor(SkColor color) { |
| custom_color_ = color; |
| } |
| |
| void FocusRingLayer::ResetColor() { |
| custom_color_.reset(); |
| } |
| |
| bool FocusRingLayer::CanAnimate() const { |
| return compositor_ && compositor_->HasAnimationObserver(this); |
| } |
| |
| 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.setAlpha((kShadowAlpha * (r - i) * (r - i)) / (r * r)); |
| gfx::Rect outsetRect = bounds; |
| outsetRect.Inset(-i, -i, -i, -i); |
| recorder.canvas()->DrawRect(outsetRect, flags); |
| } |
| } |
| |
| } // namespace ash |