自定义类似迅雷的漂浮窗口

1. 自定义窗口样式,通过自定义ControlTemplate改变窗口的形状.
   

   <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=".Resourcemessage.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>

2. 主窗口的xaml文件

   <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>

3. 主窗口代码:

   /// <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;
           }
                          
       }

4. 运行结果：