Question

In Windows 7 when you touch the screen there is a short animation that occurs at the touch point.

In my WPF app I want to display my own touch points, without showing the one supplied by Windows.

Any ideas on how to disable them in an app?

Answer 1

Found this today whilst taking a look at the Surface Toolkit for Windows Touch, seems to do the job quite nicely.

// override on the Window class
protected override void OnSourceInitialized(EventArgs e)
{
    EnableTabletGestures(this, false);
}

[DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
public static extern short GlobalAddAtom(string atom);

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr RemoveProp(IntPtr hWnd, string atom);

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
public static extern int SetProp(IntPtr hWnd, string atom, IntPtr handle);

public bool EnableTabletGestures(Window window, bool enable)
{
    var hWnd = ((HwndSource)PresentationSource.FromVisual(window)).Handle;

    long num = 0L;
    string atom = "MicrosoftTabletPenServiceProperty";
    num = GlobalAddAtom(atom);
    if (num == 0L)
    {
        return false;
    }
    if (enable)
    {
        return (RemoveProp(hWnd, atom).ToInt64() == 1L);
    }
    int num2 = 0x1010019;
    return (SetProp(hWnd, atom, new IntPtr(num2)) == 1);
}

Answer 2

You can disable them on a per-control basis, though the best bet, specially for your particular case, if to do this on the root application s window, and any spawned windows (including popups). Add the following attached properties to the "" element in your XAML file, so you end up with something like this:

<Window x:Class="MyWPFTouchFreeApp"
... [<omitted elements>]
Stylus.IsTapFeedbackEnabled="False" Stylus.IsTouchFeedbackEnabled="False"
Stylus.IsPressAndHoldEnabled="False" Stylus.IsFlicksEnabled="False"
... [<any other omitted attributes>]
>
  <Grid ...

  </Grid>
</Window>

Also, if you use the Microsoft Surface Toolkit for Windows Touch (presently in beta), using a SurfaceWindow will automatically disable these for you (Popups must still be handled manually).

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