WPF applications stop responding to the touchscreen (we are using simple button click events) after some period of time (not consistent) but WILL respond to mouse clicks and the non-WPF applications (explorer, etc) continue to respond to touch just fine.
Because the non-WPF applications respond you can likely rule out the touchscreen drivers.
Very similar to this post: http://social.msdn.microsoft.com/Forums/vstudio/en-US/0edc6c2c-f869-4e76-b207-5b2d21078a7f/touch-stop-working
...except that we are not using a SurfaceWindow nor the 'Surface SDK' and we are using an HP Touchsmart computer. We are running Windows 7 64 bit using .NET 4.5 (Visual Studio 2012).
I wonder if Microsoft melded the SurfaceWindow and Window code together at some point?
Quick Update: We reproduced the issue with our application by disabling the touchscreen in Device Manager and re-enabling it. WPF application failed to respond to touches afterwards and the rest of the system was still responding to touches.
And here's a simple MainWindow that you can use in a sample app that will demonstrate the issue:
public partial class MainWindow
{
public MainWindow()
{
InitializeComponent();
this.Topmost = true; //required to display the problem
}
private void Button_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show("Click!");
}
}
And the XAML:
<Window x:Class="TestTouchscreenApp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Button Content="Button" HorizontalAlignment="Left" Margin="142,62,0,0" VerticalAlignment="Top" Width="178" Height="88" Click="Button_Click"/>
</Grid>
</Window>
