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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 "chrome/browser/chromeos/ui/focus_ring_layer.h"
#include "base/bind.h"
#include "ui/aura/window.h"
#include "ui/compositor/layer.h"
#include "ui/gfx/canvas.h"
namespace chromeos {
namespace {
const int kShadowRadius = 10;
const int kShadowAlpha = 90;
const SkColor kShadowColor = SkColorSetRGB(77, 144, 254);
} // namespace
FocusRingLayerDelegate::~FocusRingLayerDelegate() {}
FocusRingLayer::FocusRingLayer(FocusRingLayerDelegate* delegate)
: delegate_(delegate),
root_window_(NULL) {
}
FocusRingLayer::~FocusRingLayer() {}
void FocusRingLayer::Set(aura::Window* root_window, const gfx::Rect& bounds) {
focus_ring_ = bounds;
CreateOrUpdateLayer(root_window, "FocusRing");
// Update the layer bounds.
gfx::Rect layer_bounds = bounds;
int inset = -(kShadowRadius + 2);
layer_bounds.Inset(inset, inset, inset, inset);
layer_->SetBounds(layer_bounds);
}
void FocusRingLayer::CreateOrUpdateLayer(
aura::Window* root_window, const char* layer_name) {
if (!layer_ || root_window != root_window_) {
root_window_ = root_window;
ui::Layer* root_layer = root_window->layer();
layer_.reset(new ui::Layer(ui::LAYER_TEXTURED));
layer_->set_name(layer_name);
layer_->set_delegate(this);
layer_->SetFillsBoundsOpaquely(false);
root_layer->Add(layer_.get());
}
// Keep moving it to the top in case new layers have been added
// since we created this layer.
layer_->parent()->StackAtTop(layer_.get());
}
void FocusRingLayer::OnPaintLayer(gfx::Canvas* canvas) {
if (!root_window_ || focus_ring_.IsEmpty())
return;
gfx::Rect bounds = focus_ring_ - layer_->bounds().OffsetFromOrigin();
SkPaint paint;
paint.setColor(kShadowColor);
paint.setFlags(SkPaint::kAntiAlias_Flag);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(2);
int r = kShadowRadius;
for (int i = 0; i < r; i++) {
// Fade out alpha quadratically.
paint.setAlpha((kShadowAlpha * (r - i) * (r - i)) / (r * r));
gfx::Rect outsetRect = bounds;
outsetRect.Inset(-i, -i, -i, -i);
canvas->DrawRect(outsetRect, paint);
}
}
void FocusRingLayer::OnDelegatedFrameDamage(
const gfx::Rect& damage_rect_in_dip) {
}
void FocusRingLayer::OnDeviceScaleFactorChanged(float device_scale_factor) {
if (delegate_)
delegate_->OnDeviceScaleFactorChanged();
}
base::Closure FocusRingLayer::PrepareForLayerBoundsChange() {
return base::Bind(&base::DoNothing);
}
} // namespace chromeos
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