topic Re: Handle double click on graphics layer in ArcGIS API for Silverlight Questions

Handle double click on graphics layer

MarkCollins — Tue, 08 May 2012 15:55:27 GMT

I am looking for an event or some way to handle double click on a graphics layer or more specific on my features in a feature layer.

Any one done this before or have any ideas? I know this sounds super simple but I can not find an event handler for it....

Thanks,
Mark

Re: Handle double click on graphics layer

JenniferNery — Sun, 12 Dec 2021 01:25:36 GMT

You can do something like this. But you might also want to consider click tolerance besides checking for same graphic and elapsed time since last click.

    Graphic graphic;
    TimeSpan elapsedTime;
    DateTime? startTime;
    private void FeatureLayer_MouseLeftButtonDown(object sender, GraphicMouseButtonEventArgs e)
    {
     if (graphic == null || graphic != e.Graphic)
     {
      graphic = e.Graphic;
      startTime = DateTime.Now;
     }
     else if (graphic == e.Graphic && startTime.HasValue)
     {
      elapsedTime = DateTime.Now.Subtract(startTime.Value);
      if (elapsedTime.TotalMilliseconds < 500)
      {
       
       //double click happened
      }

      graphic = null;
      startTime = null;
     }
    }

Re: Handle double click on graphics layer

dotMorten_esri — Tue, 08 May 2012 17:52:37 GMT

If you are using Silverlight 5, you could also use the Map.MouseLeftButtonDown event and check the ClickCount property. Example:

   private void MyMap_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)  {   if (e.ClickCount == 2)   {    var graphicslayer = MyMap.Layers.OfType<GraphicsLayer>().First(); //Grab graphics layer    var graphics = graphicslayer.FindGraphicsInHostCoordinates(e.GetPosition(null)); //find any graphics over clickpoint    var topGraphic = graphics.FirstOrDefault(); //grab the first hit    if (topGraphic != null) //we hit a graphic    {     e.Handled = true; //prevent map from zooming     MessageBox.Show("You dbl clicked a graphic");    }   }  }

Re: Handle double click on graphics layer

MarkCollins — Tue, 08 May 2012 19:11:07 GMT

Excellent, thank you both!