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   源码介绍

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WPFMultiTouch
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        protected override void OnManipulationStarting(ManipulationStartingEventArgs e)
        {
            FrameworkElement element = null;
            Panel pnl = null;
            
            e.ManipulationContainer = this;
            
            element = e.Source as FrameworkElement;

            pnl = element.Parent as Panel;

            for (int i = 0; i < pnl.Children.Count; i  )
            {
                Panel.SetZIndex(pnl.Children[i],
                                (pnl.Children[i] == element) ? pnl.Children.Count : i);
                
                e.Handled = true;
            }
            base.OnManipulationStarting(e);
        }

        protected override void OnManipulationDelta(ManipulationDeltaEventArgs e)
        {
            UIElement element = null;
            MatrixTransform xform = null;
            Matrix matrix;
            ManipulationDelta delta = null;
            Point center;

            element = e.Source as UIElement;

            xform = element.RenderTransform as MatrixTransform;

            matrix = xform.Matrix;

            delta = e.DeltaManipulation;

            center = e.ManipulationOrigin;

            matrix.ScaleAt(delta.Scale.X, delta.Scale.Y, center.X, center.Y);
            matrix.RotateAt(delta.Rotation, center.X, center.Y);
            matrix.Translate(delta.Translation.X, delta.Translation.Y);

            xform.Matrix = matrix;

            e.Handled = true;

            base.OnManipulationDelta(e);
        }
    }
}