ASP.NET学习网|ASP.NET教程|ASP.NET MVC|ASP.NET 源码|VS2010教程|ASP.NET视频教程

XAML  
 
<Window x:Class="MultitouchHOL.MainWindow" 
 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
 
    Title="MultitouchHOL" Height="300" Width="300" WindowState="Maximized" 
 
    xmlns:mt="clr-namespace:MultitouchHOL"> 
 
    <Canvas Name="_canvas"> 
 
    </Canvas> 
 
</Window> 
 

public MainWindow()    
{  
 
     InitializeComponent();  
 
     //启用笔触事件和加载图片  
 
     this.Loaded += (s, e) => { LoadPictures(); };  
 
     //注册鼠标事件  
 
     MouseLeftButtonDown += ProcessDown;  
 
     MouseMove += ProcessMove;  
 
     MouseLeftButtonUp += ProcessUp;  
 
     MouseWheel += ProcessMouseWheel;  
 
} 
 

private void ProcessDown(object sender, MouseButtonEventArgs args)  
{  
 
     _prevLocation = args.GetPosition(_canvas);  
 
     _picture = FindPicture(_prevMouseLocation);  
 
     BringPictureToFront(_picture);  
 
} 

private void ProcessMove(object sender, MouseEventArgs args)    
{  
 
     if (args.LeftButton == MouseButtonState.Released || _picture == null)  
 
         return;  
 
     Point newLocation = args.GetPosition(_canvas);  
 
     _picture.X += newLocation.X - _prevMouseLocation.X;  
 
     _picture.Y += newLocation.Y - _prevMouseLocation.Y;  
 
     _prevLocation = newLocation;  
 
} 
 

private void ProcessMouseWheel(object sender, MouseWheelEventArgs args)  
 
{  
 
    Point location = args.GetPosition(_canvas);  
 
    Picture picture = FindPicture(location);  
 
    if (picture == null)  
 
        return;  
 
    BringPictureToFront(picture);  
 
    double scalingFactor = 1 + args.Delta / 1000.0;  
 
    picture.ScaleX *= scalingFactor;  
 
    picture.ScaleY *= scalingFactor;  
 
} 
 

using Windows7.Multitouch;  
 
using Windows7.Multitouch.WPF;  
 
Visual Basic  
 
Imports Windows7.Multitouch  
 
Imports Windows7.Multitouch.WPF 
 

2.  我们想要在 WPF 3.5 SP1 中实现多点触摸事件。为此，必须告诉系统以触笔事件的形式发出触摸事件。Windows 7 Integration Library 的 WPF Factory 类拥有一个函数来实现此功能，那就是 EnableStylusEvent。在 MainWindow Loaded 事件处理程序中添加对此函数的调用：

public MainWindow()   
{  
 
    ...  
 
    //启用笔触事件和加载图片  
 
    this.Loaded += (s, e) => { Factory.EnableStylusEvents(this); LoadPictures(); };  
 
    ... 
 

public MainWindow()  
 
{  
 
    InitializeComponent();  
 
 
    if (!Windows7.Multitouch.TouchHandler.DigitizerCapabilities.IsMultiTouchReady)  
 
    {  
 
        MessageBox.Show("Multitouch is not availible");  
 
        Environment.Exit(1);  
 
    }  
 
 
    this.Loaded += (s, e) => { Factory.EnableStylusEvents(this); LoadPictures(); };  
 
} 
 

(责任编辑：admin)