topic Re: Binding to Envelope parameters on ZoomToAction in ArcGIS API for Silverlight Questions

Binding to Envelope parameters on ZoomToAction

MikeTischler — Thu, 29 Jul 2010 18:41:56 GMT

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:

<ListBox x:Name="Bookmarklistbox" ItemTemplate="{StaticResource bookmarkTemplate}" ItemsSource="{Binding categoryCollection}" >
</ListBox>

I've put the ItemTemplate in the UserControl resources and it looks like this:

<DataTemplate x:Key="bookmarkTemplate">
<StackPanel>
<TextBlock Text="{Binding name}"/>
<Button Name="bookmarkbutton" />
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<esriBehaviors:ZoomToAction TargetName="Map">
<esriBehaviors:ZoomToAction.Geometry>
<esriGeometry:Envelope
XMin="{Binding XMin}" YMin="{Binding YMin}" XMax="{Binding XMax}" YMax="{Binding YMax}"/>
</esriBehaviors:ZoomToAction.Geometry>
</esriBehaviors:ZoomToAction>
</i:EventTrigger>
</i:Interaction.Triggers>

Now, The button content shows up as it should with the correct bookmark name. However, I can't get the Envelope parameters to bind without an error. The error I'm receiving is "Object of System.Windows.Data.Binding cannot be converted to System.Double"

If I switch the button content to {Binding XMin}, the content changes to a coordinate...so I know I'm in the right neighborhood. But, I can't seem to figure out how to bind this correctly.

Any thoughts?

Re: Binding to Envelope parameters on ZoomToAction

JenniferNery — Fri, 30 Jul 2010 03:15:44 GMT

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

Jennifer

Re: Binding to Envelope parameters on ZoomToAction

MikeTischler — Fri, 30 Jul 2010 12:31:58 GMT

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

Re: Binding to Envelope parameters on ZoomToAction

MichaelLibio — Fri, 10 Dec 2021 22:02:35 GMT

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