Binding to Envelope parameters on ZoomToAction

Question

Hi, I'm creating a series of bookmarks with the names and extents of the bookmarks being bound to an external XML file. I've added the XML as a date source in Expression Blend. I've got a listbox like below: I've put the ItemTemplate in the UserControl resources and it looks like this:

MichaelLibio · Answer

Unfortunately these Envelope properties (XMin, YMin, XMax, YMax) are not dependency properties that's why you cannot bind to them.

Jennifer

Is there a way to extend the Envelope class to include properties (like a wrapper) that are dependency properties?

public static readonly DependencyProperty BindableXMaxProperty = 
    DependencyProperty.Register(
    "BindableXMax", typeof(Double),

...
    );
public double BindableXMax
{
    get
    {
        return (Double)GetValue(BindableXMax);
    }
    set
    {
        this.XMax = value;
        SetValue(BindableXMaxProperty, value);
    }
}

Let me know what you think.

--Michael

MikeTischler · Answer

Ah - I see.  Thanks for filling me in.

I found a workaround (if anyone is interested).  First I changed my XML.  Where there were 4 properties(Xmin, Ymin,Xmax,Ymax) for each entry before, there is a single comma-delimited string now.  I can bind that to the button.tag in the data template and parse that string in code behind on the button's click event handler.  Then I create a new envelope, and pass the parsed string parts to the bounding box coordinates of the new envelope.  Finally, I call Map.ZoomTo(mynewenv) and it works.

Thanks,
mike

JenniferNery · Answer

Unfortunately these Envelope properties (XMin, YMin, XMax, YMax) are not dependency properties that's why you cannot bind to them.

Jennifer