Events from Objects on the Information Layer

[Ziad]

I noticed that certain events like ToolTipOpening and PreviewMouseDown are not being fired from objects (like MapPolygon and Ellipse) in the information layer. Is there a specific reason for this? Is it possible to handle these events in some way?

[Andrey]

Hi Ziad,

The events of the map shape objects such as MapPolygon and MapEllipse are propagated to shape objects which are rendered on information layer. The list of these does not contain all events that supported by the FrameworkElement class. Currently map shapes support the following events:
- MouseEnter
- MouseLeave
- MouseLeftButtonDown
- MouseLeftButtonUp
- MouseMove
- MouseWheel

If you need to attach other events, then you should get the generated shape from items container and attach the event to it directly. The sample code below gets the shape object using the FindChildByType extension. It attaches the handler to the ToolTipOpening event. The AttachEvents method is called after the information layer is rendered.

using Telerik.Windows.Controls;

using Telerik.Windows.Controls.Map;



private delegate void ReaderDelegate(MapShape shape);


private void radMap_MapMouseClick(object sender, MapMouseRoutedEventArgs eventArgs)

{

    MapEllipse mapEllipse = new MapEllipse();

    mapEllipse.Fill = new SolidColorBrush(Colors.Brown);

    mapEllipse.Width = 2;

    mapEllipse.Height = 2;

    MapLayer.SetLocation(mapEllipse, eventArgs.Location);

    mapEllipse.ToolTip = "Test tooltip";


    this.informationLayer.Items.Add(mapEllipse); 
    this.Dispatcher.Invoke(DispatcherPriority.Render, new ReaderDelegate(this.AttachEvents), mapEllipse);

}



private void AttachEvents(MapShape mapShape)

{

    var element = this.informationLayer.ItemContainerGenerator.ContainerFromItem(mapShape) as FrameworkElement;

    var shape = element.FindChildByType<Shape>();


    shape.ToolTipOpening += this.shape_ToolTipOpening;

}


void shape_ToolTipOpening(object sender, ToolTipEventArgs e)

{
}

Greetings,
Andrey Murzov
the Telerik team

[Ziad]

Thank you for you answer Andrey. However, I do not seem to have the extension method 'FindChildByType' defined on the FrameworkElement class. Is it supposed to be included in the Telerik controls?

[Andrey]

Hi Ziad,

To use this extension method you should add using of the Telerik.Windows.Controls namespace. Also you should reference the Telerik.Windows.Controls.dll.

All the best,
Andrey Murzov
the Telerik team