自定义类似迅雷的漂浮窗口

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">     

    <!--窗口模板-->
    <ControlTemplate x:Key="BaseWindowControlTemplate" TargetType="{x:Type Window}">
        <Grid Width="Auto" Height="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
            <Ellipse Stroke="YellowGreen" StrokeThickness="3">
                    <Ellipse.Fill>
                        <VisualBrush >
                            <VisualBrush.Visual>
                                <Image  Source=".\Resource\message.jpg"/>
                        </VisualBrush.Visual>
                        </VisualBrush>
                </Ellipse.Fill>
            </Ellipse>
        </Grid>
    </ControlTemplate>

    <!--窗口样式-->
    <Style x:Key="BaseWindowStyle" TargetType="{x:Type Window}">
        <Setter Property="Template" Value="{StaticResource BaseWindowControlTemplate}"/>
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="WindowStyle" Value="None" />
        <Setter Property="AllowsTransparency" Value="True" />
    </Style>

</ResourceDictionary>

<Window x:Class="FlowNotes.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="50" Width="50" MouseLeftButtonDown="Window_MouseLeftButtonDown" WindowStyle="None" WindowStartupLocation="Manual" ResizeMode="NoResize" SizeToContent="Manual" BorderThickness="0" MouseDoubleClick="Window_MouseDoubleClick" IsTabStop="False" ShowInTaskbar="False">
    <Window.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="Generic.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Window.Resources>
    <Window.Style>
        <Style TargetType="{x:Type Window}"  BasedOn="{StaticResource BaseWindowStyle}" />
    </Window.Style>
</Window>

/// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            SetWindowLocation();

        }

        //无标题栏窗口的移动
        private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            this.DragMove();
        }
        //设置窗口距离右上角100单位
        private void SetWindowLocation()
        {
            double screenHeight = SystemParameters.FullPrimaryScreenHeight;
            double screenWidth = SystemParameters.FullPrimaryScreenWidth;
            this.Left = screenWidth - 100;
            this.Top = 100;
        }

    }