Handling flicks on object

Question

I have created a new UIElement that derives from Systen.Windows.Controls.Canvas.

I am trying to handle flicks made on this object.

Everything is done in C#, in code (no XAML) using the Silverlight Phone Toolkit (February version as I want to target 7.0)

In my object constructor I do:

        //Create gesture handling
        gl = GestureService.GetGestureListener(this);
        gl.Flick += new EventHandler<FlickGestureEventArgs>(gl_Flick);

and gl_Flick is simply:

    void gl_Flick(object sender, FlickGestureEventArgs e)
    {
        if (e.HorizontalVelocity >= 0)
        {
            // Right swipe (flick)
            if (gotSwipe != null)
            {
                gotSwipe(this, e);
            }
        }
    }

Now, in the constructor, I also create and add a few TextBlocks

For some reason, the flick is only generating an event if done over one of those TextBocks. If I do the flick on any of the empty area of the Canvas nothing occurs. As I can't find any documentations related to the Silverlight toolkit, everything has been done via trials&errors.

How could I do, so the flick will be recognised when performed anywhere over this canvas and not limited to over the children it contains?

Answer 1

I'm more focused towards WPF, but the way you talk about it reminds me of the classic null background issue.

The solution: set a non null background for your canvas.

EDIT: something like

myCanvas.Background = new SolidColorBrush(Color.FromArgb(1, 0, 0, 1));