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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/controls/dot_indicator.h"
#include <algorithm>
#include <utility>
#include "base/memory/ptr_util.h"
#include "ui/base/metadata/metadata_impl_macros.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/compositor/layer.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/views/cascading_property.h"
namespace views {
DotIndicator::~DotIndicator() = default;
// static
DotIndicator* DotIndicator::Install(View* parent) {
auto dot = base::WrapUnique<DotIndicator>(new DotIndicator());
dot->SetPaintToLayer();
dot->layer()->SetFillsBoundsOpaquely(false);
dot->SetVisible(false);
return parent->AddChildView(std::move(dot));
}
void DotIndicator::SetColor(SkColor dot_color, SkColor border_color) {
dot_color_ = dot_color;
border_color_ = border_color;
SchedulePaint();
}
void DotIndicator::Show() {
SetVisible(true);
}
void DotIndicator::Hide() {
SetVisible(false);
}
DotIndicator::DotIndicator() {
// Don't allow the view to process events.
SetCanProcessEventsWithinSubtree(false);
}
void DotIndicator::OnPaint(gfx::Canvas* canvas) {
canvas->SaveLayerAlpha(SK_AlphaOPAQUE);
DCHECK_EQ(width(), height());
float radius = width() / 2.0f;
const float scale = canvas->UndoDeviceScaleFactor();
const int kStrokeWidthPx = 1;
gfx::PointF center = gfx::RectF(GetLocalBounds()).CenterPoint();
center.Scale(scale);
// Fill the center.
cc::PaintFlags flags;
flags.setColor(dot_color_.value_or(GetCascadingAccentColor(this)));
flags.setAntiAlias(true);
canvas->DrawCircle(center, scale * radius - kStrokeWidthPx, flags);
// Draw the border.
flags.setColor(border_color_.value_or(GetCascadingBackgroundColor(this)));
flags.setStyle(cc::PaintFlags::kStroke_Style);
flags.setStrokeWidth(kStrokeWidthPx * scale);
canvas->DrawCircle(center, scale * radius - kStrokeWidthPx / 2.0f, flags);
}
void DotIndicator::OnThemeChanged() {
View::OnThemeChanged();
SchedulePaint();
}
BEGIN_METADATA(DotIndicator)
END_METADATA
} // namespace views
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