Shaker/Avalonia/SukiUI/Controls/CircleProgressBar.axaml

<UserControl x:Class="SukiUI.Controls.CircleProgressBar"
             xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:suki="clr-namespace:SukiUI.Controls"
             d:DesignHeight="450"
             d:DesignWidth="800"
             mc:Ignorable="d">
    <UserControl.Styles>
        <Style Selector="suki|CircleProgressBar">
            <Setter Property="Template">
                <ControlTemplate>
                    <Panel>
                        <Arc Width="{TemplateBinding Width}"
                             Height="{TemplateBinding Height}"
                             StartAngle="0"
                             Stretch="None"
                             Stroke="{DynamicResource SukiLightBorderBrush}"
                             StrokeThickness="{TemplateBinding StrokeWidth}"
                             SweepAngle="360" />
                        <Arc Name="PART_ArcFill"
                             Width="{TemplateBinding Width}"
                             Height="{TemplateBinding Height}"
                             Stretch="None"
                             Stroke="{DynamicResource SukiPrimaryColor}"
                             StrokeJoin="Round"
                             StrokeLineCap="Round"
                             StrokeThickness="{TemplateBinding StrokeWidth}"
                             SweepAngle="{TemplateBinding Value}">

                            <Arc.Transitions>
                                <Transitions>
                                    <BrushTransition Property="Stroke" Duration="0:0:0.5" />
                                    <DoubleTransition Easing="CircularEaseOut"
                                                      Property="SweepAngle"
                                                      Duration="0:0:0.8" />
                                    <DoubleTransition Easing="CircularEaseOut"
                                                      Property="StartAngle"
                                                      Duration="0:0:0.8" />
                                </Transitions>
                            </Arc.Transitions>
                        </Arc>
                        <ContentControl Margin="{TemplateBinding StrokeWidth}"
                                        HorizontalContentAlignment="Center"
                                        VerticalContentAlignment="Center"
                                        Content="{TemplateBinding Content}" />
                    </Panel>
                </ControlTemplate>
            </Setter>
            <Style Selector="^.Accent /template/ Arc#PART_ArcFill">
                <Setter Property="Stroke" Value="{DynamicResource SukiAccentColor}" />
            </Style>
            <Style Selector="^[IsIndeterminate=True] /template/ Arc#PART_ArcFill">
                <Setter Property="SweepAngle" Value="90" />
                <Style.Animations>
                    <Animation IterationCount="Infinite" Duration="0:0:1.2">
                        <KeyFrame Cue="0%">
                            <Setter Property="StartAngle" Value="270" />
                        </KeyFrame>
                        <KeyFrame Cue="100%">

                            <Setter Property="StartAngle" Value="630" />
                        </KeyFrame>
                    </Animation>
                </Style.Animations>
            </Style>

            <Style Selector="^[IsIndeterminate=False] /template/ Arc#PART_ArcFill">

                <Setter Property="StartAngle" Value="270" />

            </Style>


        </Style>
    </UserControl.Styles>

</UserControl>