HP Dx9000 Resources for Developing Touch-Friendly Applications for HP Business - Page 20

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the two contact points using stylus events in his blog. First, he enabled touch events

to the application. Then he subscribed to stylus events and identified the two touch

points via the touch IDs. In the example, two squares, one black and one red

appear at the touch down locations. The squares move accordingly to the touch

contacts and disappear when the touches are released.

Window1.xaml

<Window x:Class="MultitouchTest.Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Window1" Height="800" Width="1200">

<Canvas>

<Rectangle Canvas.Left="-20" Canvas.Top="0" Height="20"

Name="Touch1" Stroke="Black" Fill="Black"

Width="20" />

<Rectangle Canvas.Left="-20" Canvas.Top="0" Height="20"

Name="Touch2" Stroke="Red" Width="20" Fill="Red" />

</Canvas>

</Window>

Window1.xaml.cs

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;

using System.Windows.Interop;

using System.Runtime.InteropServices;

using System.Diagnostics;

namespace MultitouchTest

{

public partial class Window1 : Window

{

#region Class Variables

private int Touch1ID = 0;

// id for first touch contact

private int Touch2ID = 0;

// id for second touch contact

#endregion

#region P/Invoke

// just a little interop.

It's different this time!

[DllImport("user32.dll")]

public static extern bool SetProp(IntPtr hWnd, string lpString,

IntPtr hData);

HP Dx9000 Resources for Developing Touch-Friendly Applications for HP Business - Page 20

Window1.xaml.cs

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