WPF实现窗体中的悬浮按钮，按钮可拖动，吸附停靠在窗体边缘。

控件XAML代码：

<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>

控件cs代码：

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> /// 悬浮按钮 /// </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); } } } }}

如何使用：

<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" Title="MainWindow" Height="700" Width="1200" Background="#ff10498c" WindowStartupLocation="CenterScreen"> <Grid> <ui:FloatButton x:Name="floatBtn" ></ui:FloatButton> </Grid></Window>

效果图：

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