Radial Menu Command Binding

Written by Jawahar, Syncfusion Inc.

Radial Menu has the ability to add items through ItemsSource property. A collection of different types of objects can be added into the Items collection. If the ItemsSource is not null, the items in the items property are read-only. You cannot add an object or change the objects in the Items property.

In this case, it is pretty easy to customize each item using ItemTemplate, but there is a problem in binding the Command property to every item. It is not possible to set binding through the style setter like you would be able to in WPF.


The Value property of the Setter class in WinRT is not a dependency property and binding does not work in this case. To overcome this problem in Radial Menu, there is a Path property similar to the DisplayMemberPath property we have in all ItemsControls.

For example, let’s bind a collection of an object containing Command property:

public class Model
{
   public string Header { get; set; }
   private ICommand _command;
   public ICommand Command
    {
     get { return _command ?? (_command = new DelegateCommand(delegate { ExecuteCommand(); })); }
   }

   private void ExecuteCommand()
  {
    //Do some work....
  }
 }

Let’s create a ViewModel which contains a collection of Model objects:

 public class ViewModel
 {
   public List Commands { get; set; }
   public ViewModel()
   {
     Commands = new List
    {
       new Model {Header = "Cut"},
       new Model {Header = "Copy"},
       new Model {Header = "Paste"},
       new Model {Header = "Undo"},
       new Model {Header = "Redo"}
    };
   }
  }

The CommandPath property in Radial Menu is used to map the Command property in the model object to the Radial Menu Item Command property.



 
 


 
 
 

The output of the above code shows a Radial Menu with 5 items. Clicking an item will execute the command bound to it.

image

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