进度条

 <TargetType="{x:Type ProgressBar}">
    <Setter Property="Foreground" Value="{StaticResource Primary}"/>
    <Setter Property="Background" Value="#EEEEEE"/>
    <Setter Property="BorderThickness" Value="0"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ProgressBar}">
                <Grid Name="TemplateRoot" SnapsToDevicePixels="true">
                    <Rectangle Fill="{TemplateBinding Background}"/>
                    <Rectangle Name="PART_Track" Margin="0"/>
                    <Decorator x:Name="PART_Indicator" HorizontalAlignment="Left" Margin="0">
                        <Grid Name="Foreground">
                            <Rectangle Fill="{TemplateBinding Foreground}" Name="Indicator" />
                            <Grid x:Name="Animation" ClipToBounds="true" Visibility="Hidden">
                                <Rectangle Fill="{TemplateBinding Background}" Name="HiderPre" Margin="0,0,50,0">
                                    <Rectangle.RenderTransform>
                                        <ScaleTransform x:Name="HiderPreTransform" ScaleX="0"/>
                                    </Rectangle.RenderTransform>
                                </Rectangle>
                                <Rectangle Fill="{TemplateBinding Background}" Name="HiderPost" RenderTransformOrigin="1, 0" Margin="50,0,0,0">
                                    <Rectangle.RenderTransform>
                                        <ScaleTransform x:Name="HiderPostTransform" ScaleX="1"  />
                                    </Rectangle.RenderTransform>
                                </Rectangle>
                            </Grid>
                            <Grid Name="Overlay">
                            </Grid>
                        </Grid>
                    </Decorator>
                    <Border BorderThickness="{TemplateBinding BorderThickness}"
                    BorderBrush="{TemplateBinding BorderBrush}"/>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsIndeterminate" Value="true">
                        <Setter TargetName="Animation" Property="Visibility" Value="Visible" />
                        <Trigger.EnterActions>
                            <BeginStoryboard>
                                <Storyboard RepeatBehavior="Forever">
                                    <DoubleAnimation Storyboard.TargetName="HiderPreTransform" Storyboard.TargetProperty="(ScaleTransform.ScaleX)" To="1" Duration="0:00:4" AutoReverse="True"/>
                                    <DoubleAnimation Storyboard.TargetName="HiderPostTransform" Storyboard.TargetProperty="(ScaleTransform.ScaleX)" To="0" Duration="0:00:4" AutoReverse="True"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </Trigger.EnterActions>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="IsEnabled" Value="False">
            <Setter Property="Foreground" Value="Gray" />
        </Trigger>
    </Style.Triggers>
</Style>