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- // Copyright 2022 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 "ash/style/dot_indicator.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);
- }
- } // namespace ash
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