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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 "ash/system/tray/actionable_view.h"
#include "ash/system/tray/tray_background_view.h"
#include "ash/system/tray/tray_popup_header_button.h"
#include "base/bind.h"
#include "ui/aura/window.h"
#include "ui/compositor/layer.h"
#include "ui/gfx/canvas.h"
#include "ui/views/controls/button/label_button.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
namespace chromeos {
namespace {
const int kShadowRadius = 10;
const int kShadowAlpha = 90;
const SkColor kShadowColor = SkColorSetRGB(77, 144, 254);
} // namespace
FocusRingLayer::FocusRingLayer()
: window_(NULL),
root_window_(NULL) {
}
FocusRingLayer::~FocusRingLayer() {}
void FocusRingLayer::Update() {
if (!window_)
return;
aura::Window* root_window = window_->GetRootWindow();
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("FocusRing");
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());
// Translate native window coordinates to root window coordinates.
gfx::Point origin = focus_ring_.origin();
aura::Window::ConvertPointToTarget(window_, root_window_, &origin);
gfx::Rect layer_bounds = focus_ring_;
layer_bounds.set_origin(origin);
int inset = -(kShadowRadius + 2);
layer_bounds.Inset(inset, inset, inset, inset);
layer_->SetBounds(layer_bounds);
}
void FocusRingLayer::SetForView(views::View* view) {
if (!view) {
if (layer_ && !focus_ring_.IsEmpty())
layer_->SchedulePaint(focus_ring_);
focus_ring_ = gfx::Rect();
return;
}
DCHECK(view->GetWidget());
window_ = view->GetWidget()->GetNativeWindow();
gfx::Rect view_bounds = view->GetContentsBounds();
// Workarounds that attempts to pick a better bounds.
if (view->GetClassName() == views::LabelButton::kViewClassName) {
view_bounds = view->GetLocalBounds();
view_bounds.Inset(2, 2, 2, 2);
}
// Workarounds for system tray items that have customized focus borders. The
// insets here must be consistent with the ones used by those classes.
if (view->GetClassName() == ash::ActionableView::kViewClassName) {
view_bounds = view->GetLocalBounds();
view_bounds.Inset(1, 1, 3, 3);
} else if (view->GetClassName() == ash::TrayBackgroundView::kViewClassName) {
view_bounds.Inset(1, 1, 3, 3);
} else if (view->GetClassName() ==
ash::TrayPopupHeaderButton::kViewClassName) {
view_bounds = view->GetLocalBounds();
view_bounds.Inset(2, 1, 2, 2);
}
focus_ring_ = view->ConvertRectToWidget(view_bounds);
Update();
}
void FocusRingLayer::OnPaintLayer(gfx::Canvas* canvas) {
if (focus_ring_.IsEmpty())
return;
// Convert the focus ring from native-window-relative coordinates to
// layer-relative coordinates.
gfx::Point origin = focus_ring_.origin();
aura::Window::ConvertPointToTarget(window_, root_window_, &origin);
origin -= layer_->bounds().OffsetFromOrigin();
gfx::Rect bounds = focus_ring_;
bounds.set_origin(origin);
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::OnDeviceScaleFactorChanged(float device_scale_factor) {
Update();
}
base::Closure FocusRingLayer::PrepareForLayerBoundsChange() {
return base::Bind(&base::DoNothing);
}
} // namespace chromeos
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