SHJX_GM/SHJX.Service.Library/CustomControl/Loading/Themes/SingleRound.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:UI="clr-namespace:CustomUI">
    <ControlTemplate x:Key="SingleRound"
                     TargetType="{x:Type UI:Loading}">
        <Grid x:Name="PART_Root" Background="{TemplateBinding Background}">
            <Ellipse x:Name="PART_Ellipse"
                     Fill="{TemplateBinding Foreground}"
                     RenderTransformOrigin="0.5,0.5">
                <Ellipse.RenderTransform>
                    <ScaleTransform />
                </Ellipse.RenderTransform>
            </Ellipse>

            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="ActiveStates">
                    <VisualState x:Name="Inactive" />
                    <VisualState x:Name="Active">
                        <Storyboard Duration="0:0:1.500" RepeatBehavior="Forever"
                                    SpeedRatio="{TemplateBinding SpeedRatio}">
                            <DoubleAnimationUsingKeyFrames Storyboard.TargetName="PART_Ellipse" Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleY)">
                                <LinearDoubleKeyFrame KeyTime="0:0:0.000" Value="0" />
                                <LinearDoubleKeyFrame KeyTime="0:0:1.500" Value="1" />
                            </DoubleAnimationUsingKeyFrames>
                            <DoubleAnimationUsingKeyFrames Storyboard.TargetName="PART_Ellipse" Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleX)">
                                <LinearDoubleKeyFrame KeyTime="0:0:0.000" Value="0" />
                                <LinearDoubleKeyFrame KeyTime="0:0:1.500" Value="1" />
                            </DoubleAnimationUsingKeyFrames>

                            <DoubleAnimation Duration="0:0:1.500" From="1" Storyboard.TargetName="PART_Ellipse" Storyboard.TargetProperty="(UIElement.Opacity)"
                                             To="0" />
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>
        </Grid>
    </ControlTemplate>
</ResourceDictionary>