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// Copyright 2014 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_focus_ring_layer.h"
#include "ash/public/cpp/shell_window_ids.h"
#include "ash/shell.h"
#include "base/check.h"
#include "base/functional/bind.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/gfx/canvas.h"
#include "ui/wm/core/coordinate_conversion.h"
namespace ash {
namespace {
// The number of density-indpendent pixels in the color gradient that fades to
// transparent.
constexpr int kGradientWidth = 6;
constexpr int kDefaultStrokeWidth = 2;
constexpr float kDashLengthDip = 4.f;
constexpr float kGapLengthDip = 2.f;
int sign(int x) {
return ((x > 0) ? 1 : (x == 0) ? 0 : -1);
}
SkPath MakePath(const AccessibilityFocusRing& input_ring,
int outset,
const gfx::Vector2d& offset) {
AccessibilityFocusRing ring = input_ring;
for (int i = 0; i < 36; i++) {
gfx::Point p = input_ring.points[i];
gfx::Point prev;
gfx::Point next;
int prev_index = i;
do {
prev_index = (prev_index + 35) % 36;
prev = input_ring.points[prev_index];
} while (prev.x() == p.x() && prev.y() == p.y() && prev_index != i);
int next_index = i;
do {
next_index = (next_index + 1) % 36;
next = input_ring.points[next_index];
} while (next.x() == p.x() && next.y() == p.y() && next_index != i);
gfx::Point delta0 =
gfx::Point(sign(p.x() - prev.x()), sign(p.y() - prev.y()));
gfx::Point delta1 =
gfx::Point(sign(next.x() - p.x()), sign(next.y() - p.y()));
if (delta0.x() == delta1.x() && delta0.y() == delta1.y()) {
ring.points[i] =
gfx::Point(input_ring.points[i].x() + outset * delta0.y(),
input_ring.points[i].y() - outset * delta0.x());
} else {
ring.points[i] = gfx::Point(
input_ring.points[i].x() + ((i + 13) % 36 >= 18 ? outset : -outset),
input_ring.points[i].y() + ((i + 4) % 36 >= 18 ? outset : -outset));
}
}
SkPath path;
gfx::Point p = ring.points[0] - offset;
path.moveTo(SkIntToScalar(p.x()), SkIntToScalar(p.y()));
for (int i = 0; i < 12; i++) {
int index0 = ((3 * i) + 1) % 36;
int index1 = ((3 * i) + 2) % 36;
int index2 = ((3 * i) + 3) % 36;
gfx::Point p0 = ring.points[index0] - offset;
gfx::Point p1 = ring.points[index1] - offset;
gfx::Point p2 = ring.points[index2] - offset;
path.lineTo(SkIntToScalar(p0.x()), SkIntToScalar(p0.y()));
path.quadTo(SkIntToScalar(p1.x()), SkIntToScalar(p1.y()),
SkIntToScalar(p2.x()), SkIntToScalar(p2.y()));
}
return path;
}
} // namespace
AccessibilityFocusRingLayer::AccessibilityFocusRingLayer(
AccessibilityLayerDelegate* delegate)
: FocusRingLayer(delegate) {}
AccessibilityFocusRingLayer::~AccessibilityFocusRingLayer() = default;
void AccessibilityFocusRingLayer::Set(const AccessibilityFocusRing& ring) {
ring_ = ring;
gfx::Rect bounds = ring.GetBounds();
display::Display display =
display::Screen::GetScreen()->GetDisplayMatching(bounds);
aura::Window* root_window = Shell::GetRootWindowForDisplayId(display.id());
aura::Window* container = Shell::GetContainer(
root_window, kShellWindowId_AccessibilityBubbleContainer);
if (SkColorGetA(background_color_) > 0) {
bounds = display.bounds();
} else {
int inset = kGradientWidth;
bounds.Inset(-inset);
}
::wm::ConvertRectFromScreen(container, &bounds);
bool stack_at_top =
(stacking_order_ == FocusRingStackingOrder::ABOVE_ACCESSIBILITY_BUBBLES);
CreateOrUpdateLayer(container, "AccessibilityFocusRing", bounds,
stack_at_top);
}
void AccessibilityFocusRingLayer::SetAppearance(
FocusRingType type,
FocusRingStackingOrder stacking_order,
SkColor color,
SkColor secondary_color,
SkColor background_color) {
SetColor(color);
type_ = type;
stacking_order_ = stacking_order;
secondary_color_ = secondary_color;
background_color_ = background_color;
}
void AccessibilityFocusRingLayer::OnPaintLayer(
const ui::PaintContext& context) {
ui::PaintRecorder recorder(context, layer()->size());
if (SkColorGetA(background_color_) > 0)
DrawFocusBackground(recorder);
cc::PaintFlags flags;
flags.setAntiAlias(true);
flags.setStyle(cc::PaintFlags::kStroke_Style);
switch (type_) {
case FocusRingType::GLOW:
DrawGlowFocusRing(recorder, flags);
break;
case FocusRingType::SOLID:
DrawSolidFocusRing(recorder, flags);
break;
case FocusRingType::DASHED:
DrawDashedFocusRing(recorder, flags);
break;
}
}
void AccessibilityFocusRingLayer::DrawSolidFocusRing(
ui::PaintRecorder& recorder,
cc::PaintFlags& flags) {
CHECK(has_custom_color());
SkPath path;
gfx::Vector2d offset = layer()->bounds().OffsetFromOrigin();
flags.setColor(custom_color());
flags.setStrokeWidth(kDefaultStrokeWidth);
path = MakePath(ring_, 0, offset);
recorder.canvas()->DrawPath(path, flags);
flags.setColor(secondary_color_);
path = MakePath(ring_, kDefaultStrokeWidth, offset);
recorder.canvas()->DrawPath(path, flags);
}
void AccessibilityFocusRingLayer::DrawDashedFocusRing(
ui::PaintRecorder& recorder,
cc::PaintFlags& flags) {
CHECK(has_custom_color());
SkPath path;
gfx::Vector2d offset = layer()->bounds().OffsetFromOrigin();
flags.setColor(custom_color());
flags.setStrokeWidth(kDefaultStrokeWidth);
path = MakePath(ring_, 0, offset);
recorder.canvas()->DrawPath(path, flags);
SkScalar intervals[] = {kDashLengthDip, kGapLengthDip};
int intervals_length = 2;
flags.setPathEffect(cc::PathEffect::MakeDash(intervals, intervals_length, 0));
flags.setColor(secondary_color_);
path = MakePath(ring_, kDefaultStrokeWidth, offset);
recorder.canvas()->DrawPath(path, flags);
}
void AccessibilityFocusRingLayer::DrawGlowFocusRing(ui::PaintRecorder& recorder,
cc::PaintFlags& flags) {
CHECK(has_custom_color());
SkColor base_color = custom_color();
SkPath path;
gfx::Vector2d offset = layer()->bounds().OffsetFromOrigin();
flags.setStrokeWidth(kDefaultStrokeWidth);
const int w = kGradientWidth;
for (int i = 0; i < w; ++i) {
flags.setColor(SkColorSetA(base_color, 255 * (w - i) * (w - i) / (w * w)));
path = MakePath(ring_, i, offset);
recorder.canvas()->DrawPath(path, flags);
}
}
void AccessibilityFocusRingLayer::DrawFocusBackground(
ui::PaintRecorder& recorder) {
recorder.canvas()->DrawColor(background_color_);
gfx::Vector2d offset = layer()->bounds().OffsetFromOrigin();
SkPath path = MakePath(ring_, 0, offset);
cc::PaintFlags flags;
flags.setStyle(cc::PaintFlags::kFill_Style);
flags.setBlendMode(SkBlendMode::kClear);
flags.setColor(SkColorSetARGB(0, 0, 0, 0));
recorder.canvas()->DrawPath(path, flags);
}
} // namespace ash
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