<Button x:Class="SunCreate.Common.Controls.FloatButton"       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"        mc:Ignorable="d"        d:DesignHeight="300" d:DesignWidth="300"       Width="50" Height="50" Margin="0"        HorizontalAlignment="Left" VerticalAlignment="Top"        x:Name="btn"       Loaded="btn_Loaded" Click="btn_Click" >  <Button.Template>    <ControlTemplate>      <Grid MouseLeftButtonDown="Border_MouseLeftButtonDown">        <Border CornerRadius="25" Background="#022938" Opacity="0.2" >        </Border>        <Border CornerRadius="20" Width="40" Height="40" Background="#022938" Opacity="0.3" >        </Border>        <Border CornerRadius="14" Width="28" Height="28" Background="#b06919" Opacity="0.8" >        </Border>      </Grid>    </ControlTemplate>  </Button.Template></Button>

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Animation;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;namespace SunCreate.Common.Controls{  /// <summary>  /// 懸浮按鈕  /// </summary>  public partial class FloatButton : Button  {    public event EventHandler ClickEvent;    private bool _move = false;    double _distance = 200;    double _distanceNew = 5;    private Point _lastPos;    private Point _newPos;    private Point _oldPos;    public FloatButton()    {      InitializeComponent();    }    private void btn_Loaded(object sender, RoutedEventArgs e)    {      if (this.Parent != null && this.Parent is FrameworkElement)      {        FrameworkElement parent = this.Parent as FrameworkElement;        double left = parent.ActualWidth - this.ActualWidth - this._distanceNew;        double top = parent.ActualHeight - this.ActualHeight - this._distanceNew;        this.Margin = new Thickness(left, top, 0, 0);      }    }    private void Border_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)    {      if (this.Parent != null && this.Parent is FrameworkElement)      {        FrameworkElement parent = this.Parent as FrameworkElement;        _move = true;        _lastPos = e.GetPosition(parent);        _oldPos = _lastPos;        parent.PreviewMouseMove += (s, ee) =>        {          if (_move)          {            Point pos = ee.GetPosition(parent);            double left = this.Margin.Left + pos.X - this._lastPos.X;            double top = this.Margin.Top + pos.Y - this._lastPos.Y;            this.Margin = new Thickness(left, top, 0, 0);            _lastPos = e.GetPosition(parent);          }        };        parent.PreviewMouseUp += (s, ee) =>        {          if (_move)          {            _move = false;            Point pos = ee.GetPosition(parent);            _newPos = pos;            double left = this.Margin.Left + pos.X - this._lastPos.X;            double top = this.Margin.Top + pos.Y - this._lastPos.Y;            double right = parent.ActualWidth - left - this.ActualWidth;            double bottom = parent.ActualHeight - top - this.ActualHeight;            if (left < _distance && top < _distance) //左上            {              left = this._distanceNew;              top = this._distanceNew;            }            else if (left < _distance && bottom < _distance) //左下            {              left = this._distanceNew;              top = parent.ActualHeight - this.ActualHeight - this._distanceNew;            }            else if (right < _distance && top < _distance) //右上            {              left = parent.ActualWidth - this.ActualWidth - this._distanceNew;              top = this._distanceNew;            }            else if (right < _distance && bottom < _distance) //右下            {              left = parent.ActualWidth - this.ActualWidth - this._distanceNew;              top = parent.ActualHeight - this.ActualHeight - this._distanceNew;            }            else if (left < _distance && top > _distance && bottom > _distance) //左            {              left = this._distanceNew;              top = this.Margin.Top;            }            else if (right < _distance && top > _distance && bottom > _distance) //右            {              left = parent.ActualWidth - this.ActualWidth - this._distanceNew;              top = this.Margin.Top;            }            else if (top < _distance && left > _distance && right > _distance) //上            {              left = this.Margin.Left;              top = this._distanceNew;            }            else if (bottom < _distance && left > _distance && right > _distance) //下            {              left = this.Margin.Left;              top = parent.ActualHeight - this.ActualHeight - this._distanceNew;            }            ThicknessAnimation marginAnimation = new ThicknessAnimation();            marginAnimation.From = this.Margin;            marginAnimation.To = new Thickness(left, top, 0, 0);            marginAnimation.Duration = TimeSpan.FromMilliseconds(200);            Storyboard story = new Storyboard();            story.FillBehavior = FillBehavior.Stop;            story.Children.Add(marginAnimation);            Storyboard.SetTargetName(marginAnimation, "btn");            Storyboard.SetTargetProperty(marginAnimation, new PropertyPath("(0)", Border.MarginProperty));            story.Begin(this);            this.Margin = new Thickness(left, top, 0, 0);          }        };      }    }    private void btn_Click(object sender, RoutedEventArgs e)    {      if (_newPos.Equals(_oldPos))      {        if (ClickEvent != null)        {          ClickEvent(sender, e);        }      }    }  }}

<Window    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    xmlns:ui="clr-namespace:SunCreate.Common.Controls;assembly=SunCreate.Common.Controls"    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="SunCreate.Common.Controls.Demo.MainWindow"    Height="700" Width="1200"     Background="#ff10498c"     WindowStartupLocation="CenterScreen">  <Grid>    <ui:FloatButton x:Name="floatBtn" ></ui:FloatButton>  </Grid></Window>