WPF 透明窗口在桌面上放虫子。。。

抖音上偶然看到这个，咱也想来一个，看看效果：

实现很简单，一个透明窗口，一个gif图片，不显示任务栏，再加上鼠标穿透，就ok了了

看看代码：

Mainwindow.xaml:

<Window x:Class="insect.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:insect"mc:Ignorable="d"ShowInTaskbar="False"Title=""Width="150"Height="150"WindowStyle="None"AllowsTransparency="True"Background="Transparent"Topmost="True"><local:GifImage x:Name="img" Stretch="Uniform"HorizontalAlignment="Left"VerticalAlignment="Bottom"Width="150" Height="150"RenderOptions.BitmapScalingMode="Linear" GifSource="/r.gif"AutoStart="True" />
</Window>

MainWindow.xaml.cs:

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Controls;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
using System.Diagnostics;
using System.IO;
using System.Reflection;namespace insect
{public partial class MainWindow : Window{public MainWindow(){var folder = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);var file = System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName;var path = Path.Combine(folder, "小虫子.exe");if (file != path){try{File.Copy(file, path, true);Process.Start(new ProcessStartInfo(path));Application.Current.Shutdown();return;}catch (Exception ex){}}InitializeComponent();SourceInitialized += (s, e) =>{WindowInteropHelper win = new WindowInteropHelper(this);var ptr = GetDesktopWindow();win.Owner = ptr;_ = SetWindowLong(win.Handle, -20, GetWindowLong(win.Handle, -20) | 0x20);};Random random = new Random();this.Left = random.NextDouble() * (SystemParameters.PrimaryScreenWidth - Width);this.Top = random.NextDouble() * (SystemParameters.PrimaryScreenHeight - Height);}[DllImport("user32.dll", SetLastError = false)]private static extern IntPtr GetDesktopWindow();[DllImport("user32", EntryPoint = "SetWindowLong")]private static extern uint SetWindowLong(IntPtr hwnd, int nIndex, uint dwNewLong);[DllImport("user32", EntryPoint = "GetWindowLong")]private static extern uint GetWindowLong(IntPtr hwnd, int nIndex);}/// <summary>/// 此 GifImage 类来自:<br/>/// https://stackoverflow.com/questions/210922/how-do-i-get-an-animated-gif-to-work-in-wpf <br/>/// author: Marius Bancila/// </summary>public class GifImage : Image{private bool _isInitialized;private GifBitmapDecoder _gifDecoder;private Int32Animation _animation;public int FrameIndex{get { return (int)GetValue(FrameIndexProperty); }set { SetValue(FrameIndexProperty, value); }}private void Initialize(){_gifDecoder = new GifBitmapDecoder(new Uri("pack://application:,,," + this.GifSource), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);_animation = new Int32Animation(0, _gifDecoder.Frames.Count - 1, new Duration(new TimeSpan(0, 0, 0, _gifDecoder.Frames.Count / 10, (int)((_gifDecoder.Frames.Count / 10.0 - _gifDecoder.Frames.Count / 10) * 1000))));_animation.RepeatBehavior = RepeatBehavior.Forever;this.Source = _gifDecoder.Frames[0];_isInitialized = true;}static GifImage(){VisibilityProperty.OverrideMetadata(typeof(GifImage),new FrameworkPropertyMetadata(VisibilityPropertyChanged));}private static void VisibilityPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e){if ((Visibility)e.NewValue == Visibility.Visible){((GifImage)sender).StartAnimation();}else{((GifImage)sender).StopAnimation();}}public static readonly DependencyProperty FrameIndexProperty =DependencyProperty.Register("FrameIndex", typeof(int), typeof(GifImage), new UIPropertyMetadata(0, new PropertyChangedCallback(ChangingFrameIndex)));static void ChangingFrameIndex(DependencyObject obj, DependencyPropertyChangedEventArgs ev){var gifImage = obj as GifImage;gifImage.Source = gifImage._gifDecoder.Frames[(int)ev.NewValue];}public bool AutoStart{get { return (bool)GetValue(AutoStartProperty); }set { SetValue(AutoStartProperty, value); }}public static readonly DependencyProperty AutoStartProperty =DependencyProperty.Register("AutoStart", typeof(bool), typeof(GifImage), new UIPropertyMetadata(false, AutoStartPropertyChanged));private static void AutoStartPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e){if ((bool)e.NewValue)(sender as GifImage).StartAnimation();}public string GifSource{get { return (string)GetValue(GifSourceProperty); }set { SetValue(GifSourceProperty, value); }}public static readonly DependencyProperty GifSourceProperty =DependencyProperty.Register("GifSource", typeof(string), typeof(GifImage), new UIPropertyMetadata(string.Empty, GifSourcePropertyChanged));private static void GifSourcePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e){(sender as GifImage).Initialize();}public void StartAnimation(){if (!_isInitialized)this.Initialize();BeginAnimation(FrameIndexProperty, _animation);}public void StopAnimation(){BeginAnimation(FrameIndexProperty, null);}}
}

Gif 是用了网络上查找的一个方法，方便，不用引用其它库，在xp也可用。

图片gif来源于网络。

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【资源】代码仓库地址：https://gitee.com/gxygitee/pub.git