Events

17 Jan 202514 minutes to read

Perform an action when navigating to the next level

In a radial menu, you can perform actions when navigating from one level to another. The Navigating event occurs when navigating from one level to another, and the Navigated event occurs after navigating to another level.

C#

using Android.App;
using Android.Widget;
using Android.OS;
using Syncfusion.SfRadialMenu.Android;
using Android.Graphics;
using Android.Views;
using System.Collections.Generic;

namespace GettingStarted
{
    [Activity(Label = "GettingStarted", MainLauncher = true)]
    public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SfRadialMenu radialMenu = new SfRadialMenu(this);
            radialMenu.Navigating += RadialMenu_Navigating;
            radialMenu.Navigated += RadialMenu_Navigated;
            List<SfRadialMenuItem> itemCollection = new List<SfRadialMenuItem>();
            itemCollection.Add(new SfRadialMenuItem(this) { Text = "Cut" });
            itemCollection.Add(new SfRadialMenuItem(this) { Text = "Copy" });
            itemCollection.Add(new SfRadialMenuItem(this) { Text = "Paste" });
            radialMenu.Items = itemCollection;
            radialMenu.CenterButtonText = "\uE713";
            radialMenu.CenterButtonTypeface = Typeface.CreateFromAsset(this.Assets, "Segoe MDL2 Assets.ttf");
            radialMenu.CenterButtonRadius = 32;
            radialMenu.CenterButtonBorderColor = Color.White;
            SetContentView(radialMenu);
        }

        private void RadialMenu_Navigated(object sender, NavigatedEventArgs e)
        {
            Android.App.AlertDialog.Builder dialog = new Android.App.AlertDialog.Builder(this);
            Android.App.AlertDialog alert = dialog.Create();
            alert.SetTitle("Alert");
            alert.SetMessage("ItemNavigated");
            alert.SetButton("OK", (c, eve) =>
            {
                // OK button click task  
            });

            alert.Show();
        }

        private void RadialMenu_Navigating(object sender, NavigatingEventArgs e)
        {
            Android.App.AlertDialog.Builder dialog = new Android.App.AlertDialog.Builder(this);
            Android.App.AlertDialog alert = dialog.Create();
            alert.SetTitle("Alert");
            alert.SetMessage("ItemNavigating");
            alert.SetButton("OK", (c, eve) =>
            {
                // OK button click task  
            });

            alert.Show();
        }
    }
}

NOTE

You can cancel navigation using the Cancel event argument.

Perform an action when opening the radial menu

You can perform an action when opening the radial menu. The Opening event occurs when opening the radial menu, and the Opened event occurs after the radial menu is opened.

C#

using Android.App;
using Android.Widget;
using Android.OS;
using Syncfusion.SfRadialMenu.Android;
using Android.Graphics;
using Android.Views;
using System.Collections.Generic;

namespace GettingStarted
{
    [Activity(Label = "GettingStarted", MainLauncher = true)]
    public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SfRadialMenu radialMenu = new SfRadialMenu(this);
            radialMenu.Opening += RadialMenu_Opening;
            radialMenu.Opened += RadialMenu_Opened;
            List<SfRadialMenuItem> itemCollection = new List<SfRadialMenuItem>();
            itemCollection.Add(new SfRadialMenuItem(this) { Text = "Cut" });
            itemCollection.Add(new SfRadialMenuItem(this) { Text = "Copy" });
            itemCollection.Add(new SfRadialMenuItem(this) { Text = "Paste" });
            radialMenu.Items = itemCollection;
            radialMenu.CenterButtonText = "\uE713";
            radialMenu.CenterButtonBackText = "\uE72b";
            radialMenu.CenterButtonTypeface = Typeface.CreateFromAsset(this.Assets, "Segoe_MDL2_Assets.ttf");
            radialMenu.CenterButtonRadius = 32;
            radialMenu.CenterButtonBorderColor = Color.White;
            SetContentView(radialMenu);
        }

        private void RadialMenu_Opened(object sender, OpenedEventArgs e)
        {
            Android.App.AlertDialog.Builder dialog = new Android.App.AlertDialog.Builder(this);
            Android.App.AlertDialog alert = dialog.Create();
            alert.SetTitle("Alert");
            alert.SetMessage("ItemOpening");
            alert.SetButton("OK", (c, eve) =>
            {
                // OK button click task  
            });
            alert.Show();
        }

        private void RadialMenu_Opening(object sender, OpeningEventArgs e)
        {
            Android.App.AlertDialog.Builder dialog = new Android.App.AlertDialog.Builder(this);
            Android.App.AlertDialog alert = dialog.Create();
            alert.SetTitle("Alert");
            alert.SetMessage("ItemOpened");
            alert.SetButton("OK", (c, eve) =>
            {
                // OK button click task  
            });
            alert.Show();
        }
    }
}

Perform an action when closing the radial menu

You can perform an action when closing the radial menu. The Closing event occurs when closing the radial menu, and the Closed event occurs after the radial menu is closed.

NOTE

You can cancel the opening of the radial menu using the Cancel event argument.

C#

using Android.App;
using Android.Widget;
using Android.OS;
using Syncfusion.SfRadialMenu.Android;
using Android.Graphics;
using Android.Views;
using System.Collections.Generic;

namespace GettingStarted
{
    [Activity(Label = "GettingStarted", MainLauncher = true)]
    public class MainActivity : Activity
    {
		protected override void OnCreate(Bundle savedInstanceState)
		{
			base.OnCreate(savedInstanceState);
			SfRadialMenu radialMenu = new SfRadialMenu(this);
			radialMenu.Closing += RadialMenu_Closing;
			radialMenu.Closed += RadialMenu_Closed;
			List<SfRadialMenuItem> itemCollection = new List<SfRadialMenuItem>();
			itemCollection.Add(new SfRadialMenuItem(this) {Text="Cut"});
			itemCollection.Add(new SfRadialMenuItem(this) {Text ="Copy"});
			itemCollection.Add(new SfRadialMenuItem(this) {Text ="Paste"});
			radialMenu.Items = itemCollection;
			radialMenu.CenterButtonText = "\uE713";
			radialMenu.CenterButtonBackText = "\uE72b";
			radialMenu.CenterButtonTypeface = Typeface.CreateFromAsset(this.Assets, "Segoe MDL2 Assets.ttf");
			radialMenu.CenterButtonRadius = 32;
			radialMenu.CenterButtonBorderColor = Color.White;
			SetContentView(radialMenu);
		}

		private void RadialMenu_Closed(object sender, ClosedEventArgs e)
		{
			Android.App.AlertDialog.Builder dialog = new Android.App.AlertDialog.Builder(this);
			Android.App.AlertDialog alert = dialog.Create();
			alert.SetTitle("Alert");
			alert.SetMessage("ItemClosed");
			alert.SetButton("OK", (c, eve) =>
			{
				// OK button click task  
			});
			alert.Show();
		}

		private void RadialMenu_Closing(object sender, ClosingEventArgs e)
		{
			Android.App.AlertDialog.Builder dialog = new Android.App.AlertDialog.Builder(this);
			Android.App.AlertDialog alert = dialog.Create();
			alert.SetTitle("Alert");
			alert.SetMessage("ItemClosing");
			alert.SetButton("OK", (c, eve) =>
			{
				// OK button click task  
			});
			alert.Show();
		}
	}
}

NOTE

You can close navigation using the Cancel event argument.

Perform an action by tapping the center button

You can perform an action by tapping the center button of the radial menu. The CenterButtonBackTapped event occurs when the center button of the radial menu is tapped.

C#

using Android.App;
using Android.Widget;
using Android.OS;
using Syncfusion.SfRadialMenu.Android;
using Android.Graphics;
using Android.Views;
using System.Collections.Generic;

namespace GettingStarted
{
    [Activity(Label = "GettingStarted", MainLauncher = true)]
    public class MainActivity : Activity
    {
	protected override void OnCreate(Bundle savedInstanceState)
		{
			base.OnCreate(savedInstanceState);
			SfRadialMenu radialMenu = new SfRadialMenu(this);
			radialMenu.CenterButtonBackTapped += RadialMenu_CenterButtonBackTapped;
			List<SfRadialMenuItem> itemCollection = new List<SfRadialMenuItem>();
			itemCollection.Add(new SfRadialMenuItem(this) {Text="Cut"});
			itemCollection.Add(new SfRadialMenuItem(this) {Text ="Copy"});
			itemCollection.Add(new SfRadialMenuItem(this) {Text ="Paste"});
			radialMenu.Items = itemCollection;
			radialMenu.CenterButtonText = "\uE713";
			radialMenu.CenterButtonBackText = "\uE72b";
			radialMenu.CenterButtonTypeface = Typeface.CreateFromAsset(this.Assets, "Segoe MDL2 Assets.ttf");
			radialMenu.CenterButtonRadius = 32;
			radialMenu.CenterButtonBorderColor = Color.White;
			SetContentView(radialMenu);
		}

		private void RadialMenu_CenterButtonBackTapped(object sender, CenterButtonBackTappedEventArgs e)
		{
			Android.App.AlertDialog.Builder dialog = new Android.App.AlertDialog.Builder(this);
			Android.App.AlertDialog alert = dialog.Create();
			alert.SetTitle("Alert");
			alert.SetMessage("CenterButtonBackTapped");
			alert.SetButton("OK", (c, eve) =>
			{
				// OK button click task  
			});
			alert.Show();
		}
	}
}

Perform an action by tapping the radial menu item

You can perform an action by tapping a radial menu item. The CenterButtonBackTapped event occurs when the radial menu item is tapped.

XAML

using Android.App;
using Android.Widget;
using Android.OS;
using Syncfusion.SfRadialMenu.Android;
using Android.Graphics;
using Android.Views;
using System.Collections.Generic;

namespace GettingStarted
{
    [Activity(Label = "GettingStarted", MainLauncher = true)]
    public class MainActivity : Activity
    {
		protected override void OnCreate(Bundle savedInstanceState)
		{
			base.OnCreate(savedInstanceState);
			SfRadialMenu radialMenu = new SfRadialMenu(this);
			List<SfRadialMenuItem> itemCollection = new List<SfRadialMenuItem>();
			itemCollection.Add(new SfRadialMenuItem(this) {Text="Cut"});
			itemCollection.Add(new SfRadialMenuItem(this) {Text ="Copy"});
			itemCollection.Add(new SfRadialMenuItem(this) {Text ="Paste"});			
			radialMenu.Items = itemCollection;
			radialMenu.CenterButtonText = "\uE713";
			radialMenu.CenterButtonTypeface = Typeface.CreateFromAsset(this.Assets, "Segoe MDL2 Assets.ttf");
			radialMenu.CenterButtonRadius = 32;
			radialMenu.CenterButtonBorderColor = Color.White;
			radialMenu.Items[0].ItemTapped += MainActivity_ItemTapped;
			SetContentView(radialMenu);
		}

		private void MainActivity_ItemTapped(object sender, RadialMenuItemTappedEventArgs e)
		{
			Android.App.AlertDialog.Builder dialog = new Android.App.AlertDialog.Builder(this);
			Android.App.AlertDialog alert = dialog.Create();
			alert.SetTitle("Alert");
			alert.SetMessage("ItemTapped");
			alert.SetButton("OK", (c, eve) =>
			{
				// OK button click task  
			});
			alert.Show();
		}
	}
}