Why do mouse events get promoted beside Touch events?

Question

I would like to know please, how to prevent WPF promoting mouse events when the source of the event is a touch ?

I read the article of JoshB here but, the mouse events keep getting triggered, although I did e.Handled = true;

Here is what JoshB says:

The touch event flow with no manipulations. The touch events are unhandled, so WPF promotes the event to the mouse equivalent

So, I tried in my code to mark the event as handled, but WPF still promotes mouse events once I touch the_touchCanvas which is InkSurface

Here is my code: ( I am not using Microsoft Surface SDK )

_touchCanvas.IsManipulationEnabled=true;
_touchCanvas.TouchDown+=newEventHandler<TouchEventArgs>(touchDown);
_touchCanvas.TouchMove+=newEventHandler<TouchEventArgs>(touchMove);
_touchCanvas.TouchEnter+=newEventHandler<TouchEventArgs>(touchEnter);
_touchCanvas.TouchLeave+=newEventHandler<TouchEventArgs>(touchLeave);

_touchCanvas.ManipulationDelta+=newEventHandler<ManipulationDeltaEventArgs>(ManipulationDelta);
_touchCanvas.ManipulationStarting+=newEventHandler<ManipulationStartingEventArgs>(ManipulationStarting);
_touchCanvas.ManipulationCompleted+=newEventHandler<ManipulationCompletedEventArgs>(ManipulationCompleted);


void touchDown(object sender,TouchEventArgs e)
{
e.Handled=true;
}
void touchMove(object sender,TouchEventArgs e)
{
e.Handled=true;
}
void touchLeave(object sender,TouchEventArgs e)
{
e.Handled=true;
}


voidManipulationDelta(object sender,ManipulationDeltaEventArgs e)
{
    e.Handled=true;
}

voidManipulationStarting(object sender,ManipulationStartingEventArgs e)
{
    e.Handled=true;
}
voidManipulationCompleted(object sender,ManipulationCompletedEventArgs e)
{
   e.Handled=true;
}

---

hopewise

Answer 1

Hi hopewise:

This is a quick note to let you know that I am working on your issue.

Best regards,

---

Sheldon _Xiao[MSFT]
MSDN Community Support | Feedback to us
Microsoft
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 2

Thanks Sheldon .. I appreciate that 

---

hopewise

Answer 3

Hi hopewise,

    I tried a very simple sample code(just using TextBox) to reproduce your problem, but I get the right event triggered as describeld here http://msdn.microsoft.com/en-us/library/ms754010.aspx#touch_and_manipulation,

<Grid Background="Blue" MouseDown="Grid_MouseDown" MouseLeftButtonDown="Grid_MouseLeftButtonDown">      
            <TextBox x:Name="txtBox" Width="200" Height="50" HorizontalAlignment="Center" VerticalAlignment="Center" Background="DarkCyan"
                     IsManipulationEnabled="True"
                     ManipulationDelta="txtBox_ManipulationDelta"
                     ManipulationInertiaStarting="txtBox_ManipulationInertiaStarting"
                     ManipulationCompleted="txtBox_ManipulationCompleted"
                    
                     MouseLeftButtonDown="txtBox_MouseLeftButtonDown"
                     MouseDown="txtBox_MouseDown"                    
                     TouchDown="txtBox_TouchDown"
                     TouchMove="txtBox_TouchMove"
                     TouchEnter="txtBox_TouchEnter"
                     TouchLeave="txtBox_TouchLeave"/>
    </Grid>

 private void txtBox_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
        {
            MessageBox.Show("txtBox_ManipulationDelta is fired!");
            e.Handled = true;

        }

        private void txtBox_ManipulationInertiaStarting(object sender, ManipulationInertiaStartingEventArgs e)
        {
            MessageBox.Show("txtBox_ManipulationInertiaStarting is fired!");
            e.Handled = true;

        }

        private void txtBox_ManipulationCompleted(object sender, ManipulationCompletedEventArgs e)
        {
            MessageBox.Show("txtBox_ManipulationCompleted is fired!");
            e.Handled = true;

        }

        private void txtBox_TouchDown(object sender, TouchEventArgs e)
        {
            MessageBox.Show("txtBox_TouchDown is fired!");
            e.Handled = true;

        }

        private void txtBox_TouchMove(object sender, TouchEventArgs e)
        {
            MessageBox.Show("txtBox_TouchMove is fired!");
            e.Handled = true;
        }

        private void txtBox_TouchEnter(object sender, TouchEventArgs e)
        {
            MessageBox.Show("txtBox_TouchEnter is fired!");
            e.Handled = true;

        }

        private void txtBox_TouchLeave(object sender, TouchEventArgs e)
        {
            MessageBox.Show("txtBox_TouchLeave is fired!");
            e.Handled = true;

        }

        private void txtBox_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            MessageBox.Show("txtBox_MouseLeftButtonDown is fired!");
            e.Handled = true;

        }

        private void txtBox_MouseDown(object sender, MouseButtonEventArgs e)
        {
            MessageBox.Show("txtBox_MouseLeftButtonDown is fired!");
            e.Handled = true;

        }

        private void Grid_MouseDown(object sender, MouseButtonEventArgs e)
        {
            MessageBox.Show("Grid_MouseDown is fired!");
            e.Handled = true;
        }

        private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            MessageBox.Show("Grid_MouseLeftButtonDown is fired!");
            e.Handled = true;
        }

The results are as follows,

1. when running with touch screen, just the  TouchDown="txtBox_TouchDown"
                        TouchMove="txtBox_TouchMove"
                        TouchEnter="txtBox_TouchEnter"
                        TouchLeave="txtBox_TouchLeave" events works;
2. when running without touch screen, the touch events doesn't get triggerd, the mouse events get triggered.

So here  I would like to know that if you could provide your project to reproduce your problem.

Best Regards,

Jenny Li [MSFT]