Setting ToolTips using MVVM

[Nuno]

Hi,

I need to read Shapefiles manually to be able to remove some polygons. (Can't use MapShapeReader, right?)

MainPage.xaml:

<telerik:InformationLayer x:Name="StateLayer" ItemsSource="{Binding Source={StaticResource DataContext}, Path=States, Mode=TwoWay}">

MapViewModel.cs:

public List<FrameworkElement> States
{
get { return _states; }
set {    
if (this._states == value)
return;

_states = value;
OnPropertyChanged("States");
     }
}
...

this.States = _allShapesToLoad; // I'm using MVVM to bind this.States to the InformationLayer ItemsSource

How can I set ToolTips to each polygon (State: StateName) from the ViewModel to the InformationLayer ?
Since I can't use MapShapeReader in this scenario I can't use ToolTipFormat="STATE_NAME"

Thank you,
Nuno

[Andrey]

Hello Nuno,

You definetely can use MapShapeReader from the view model. So you can use ToolTipFormat property. For example:

public class MapViewModel : ViewModelBase
{
    private MapShapeReader shapeReader = new MapShapeReader();
    private List<FrameworkElement> _states = null;

    public MapViewModel()
    {
        shapeReader.Source = new Uri("/Telerik.RadMap.Silverlight.Q1;component/usa_states.shp", UriKind.RelativeOrAbsolute);
        shapeReader.ToolTipFormat = "STATE_NAME";
        shapeReader.PreviewReadCompleted += new PreviewReadShapesCompletedEventHandler(this.ShapePreviewReadCompleted);
        shapeReader.Read();
    }

    public List<FrameworkElement> States
    {
        get { return _states; }
        set
        {
            if (this._states == value)
                return;

            _states = value;
            OnPropertyChanged("States");
        }
    }

    private void ShapePreviewReadCompleted(object sender, PreviewReadShapesCompletedEventArgs eventArgs)
    {
        this.States = eventArgs.Items;
    }
}

public MainPage()
{
    InitializeComponent();

    this.informationLayer.DataContext = new MapViewModel();
}

Kind regards,
Andrey Murzov
the Telerik team

[Nuno]

Hi Andrey,

Once again, thank you very much for your wise help.

I was using the ReadCompleted event which was forcing me to create a dummy InformationLayer on the fly so that I could have access to its items collection after ReadComplet finishes. Now I switched to the PreviewReadCompleted event since I am able to reach the items collection through eventArgs.Items and as a bonus I don't need to create the dummy Information Layer!

To create ToolTips I was doing this way, for each State:

ToolTip tooltip = new ToolTip();
tooltip.Placement = System.Windows.Controls.Primitives.PlacementMode.Mouse; 
tooltip.Content = "State: " + stateName;
ToolTipService.SetToolTip(polygon, tooltip);

=> Now, it's just like this: shapeReader.ToolTipFormat = "STATE_NAME";

Cheers Andrey!

Nuno