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WPF實現窗體中的懸浮按鈕，按鈕可拖動，吸附停靠在窗體邊緣。
控件XAML代碼：
<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代碼：
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);
}
}
}
}
}
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>
效果圖：
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