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// Copyright 2022 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/style/dot_indicator.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/compositor/layer.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/scoped_canvas.h"
#include "ui/gfx/skia_paint_util.h"
namespace ash {
namespace {
// The shadow value installed on the dot indicator.
const gfx::ShadowValues kIndicatorShadow =
gfx::ShadowValue::MakeChromeOSSystemUIShadowValues(2);
} // namespace
DotIndicator::DotIndicator(SkColor indicator_color)
: shadow_values_(kIndicatorShadow), indicator_color_(indicator_color) {
SetPaintToLayer();
layer()->SetFillsBoundsOpaquely(false);
SetVisible(false);
}
DotIndicator::~DotIndicator() = default;
void DotIndicator::SetColor(SkColor new_color) {
indicator_color_ = new_color;
SchedulePaint();
}
void DotIndicator::SetIndicatorBounds(gfx::Rect indicator_bounds) {
// Include the shadow margin to the bounds.
indicator_bounds.Inset(gfx::ShadowValue::GetMargin(shadow_values_));
SetBoundsRect(indicator_bounds);
}
void DotIndicator::OnPaint(gfx::Canvas* canvas) {
// Return early if the indicator bounds are not set yet.
if (bounds().IsEmpty())
return;
gfx::ScopedCanvas scoped(canvas);
canvas->SaveLayerAlpha(SK_AlphaOPAQUE);
const float dsf = canvas->UndoDeviceScaleFactor();
// Remove the shadow margin to get the indicator bounds without shadow.
gfx::Rect bounds_without_shadow = bounds();
gfx::Insets shadow_insets = -gfx::ShadowValue::GetMargin(shadow_values_);
bounds_without_shadow.Inset(shadow_insets);
float radius = bounds_without_shadow.width() / 2.0f;
// Set the center of the dot with the shadow offset.
gfx::PointF center =
gfx::PointF(radius + shadow_insets.left(), radius + shadow_insets.top());
center.Scale(dsf);
// Fill the center.
cc::PaintFlags flags;
flags.setLooper(gfx::CreateShadowDrawLooper(shadow_values_));
flags.setColor(indicator_color_);
flags.setAntiAlias(true);
canvas->DrawCircle(center, dsf * radius, flags);
}
BEGIN_METADATA(DotIndicator)
END_METADATA
} // namespace ash
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