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// Copyright 2016 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/accessibility_cursor_ring_layer.h"
#include "ash/public/cpp/shell_window_ids.h"
#include "ash/shell.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkPath.h"
#include "ui/aura/window.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"
#include "ui/wm/core/coordinate_conversion.h"
namespace ash {
namespace {
// The number of pixels in the color gradient that fades to transparent.
const int kGradientWidth = 8;
// The radius of the ring in pixels.
const int kCursorRingRadius = 24;
// Extra margin to add to the layer in pixels.
const int kLayerMargin = 8;
} // namespace
AccessibilityCursorRingLayer::AccessibilityCursorRingLayer(
AccessibilityLayerDelegate* delegate,
int red,
int green,
int blue)
: FocusRingLayer(delegate), red_(red), green_(green), blue_(blue) {}
AccessibilityCursorRingLayer::~AccessibilityCursorRingLayer() = default;
void AccessibilityCursorRingLayer::Set(const gfx::Point& location) {
location_ = location;
gfx::Rect bounds = gfx::Rect(location.x(), location.y(), 0, 0);
int inset = kGradientWidth + kCursorRingRadius + kLayerMargin;
bounds.Inset(-inset);
display::Display display =
display::Screen::GetScreen()->GetDisplayMatching(bounds);
aura::Window* root_window = Shell::GetRootWindowForDisplayId(display.id());
// Root could be null if window tree host is being updated. See
// http://b/326074244 for more details.
if (!root_window) {
return;
}
aura::Window* container = Shell::GetContainer(
root_window, kShellWindowId_AccessibilityBubbleContainer);
wm::ConvertRectFromScreen(container, &bounds);
CreateOrUpdateLayer(container, "AccessibilityCursorRing", bounds,
/*stack_at_top=*/true);
}
void AccessibilityCursorRingLayer::OnPaintLayer(
const ui::PaintContext& context) {
ui::PaintRecorder recorder(context, layer()->size());
cc::PaintFlags flags;
flags.setAntiAlias(true);
flags.setStyle(cc::PaintFlags::kStroke_Style);
flags.setStrokeWidth(2);
gfx::Rect r = layer()->bounds();
r.Offset(-r.OffsetFromOrigin());
r.Inset(kLayerMargin);
const int w = kGradientWidth;
for (int i = 0; i < w; ++i) {
flags.setColor(SkColorSetARGB(255 * i * i / (w * w), red_, green_, blue_));
SkPath path;
path.addOval(SkRect::MakeXYWH(r.x(), r.y(), r.width(), r.height()));
r.Inset(1);
recorder.canvas()->DrawPath(path, flags);
}
}
} // namespace ash
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