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EventsTab Class

Provides a PropertyTab that can display events for selection and linking.

Namespace: System.Windows.Forms.Design
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public class EventsTab : PropertyTab
public class EventsTab extends PropertyTab
public class EventsTab extends PropertyTab

The following code example provides an example EventsTab. When selected, the EventsTab lists any events on a component in order of delegate type.

using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections;
using System.Drawing;
using System.IO;
using System.Reflection;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Windows.Forms;
using System.Windows.Forms.Design;

namespace EventsTabExample
{    
    // This component adds a TypeEventsTab to the Properties Window.
    [PropertyTabAttribute(typeof(TypeEventsTab), PropertyTabScope.Document)]
    public class TypeEventsTabComponent : Component
    {
        public TypeEventsTabComponent()
        {
        }
    }

    // This example events tab lists events by their delegate type.
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.InheritanceDemand, Name="FullTrust")]
    [System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Name="FullTrust")]
    public class TypeEventsTab : System.Windows.Forms.Design.EventsTab
    {
        [BrowsableAttribute(true)]
        // This string contains a Base-64 encoded and serialized example 
        // property tab image.
        private string img = "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";
        private IServiceProvider sp;

        public TypeEventsTab(IServiceProvider sp) : base(sp)
        {
            this.sp = sp;           
        }
                  
        // Returns the properties of the specified component extended with a 
        // CategoryAttribute reflecting the name of the type of the property.
        public override System.ComponentModel.PropertyDescriptorCollection 
            GetProperties(ITypeDescriptorContext context, object component, 
            System.Attribute[] attributes)
        {            
            // Obtain an instance of the IEventBindingService.
            IEventBindingService eventPropertySvc = (IEventBindingService)
                sp.GetService(typeof(IEventBindingService));

            // Return if an IEventBindingService could not be obtained.
            if (eventPropertySvc == null)             
                return new PropertyDescriptorCollection(null);
            
            // Obtain the events on the component.
            EventDescriptorCollection events = 
                TypeDescriptor.GetEvents(component, attributes);       
     
            // Create an array of the events, where each event is assigned 
            // a category matching its type.
            EventDescriptor[] newEvents = new EventDescriptor[events.Count];
            for(int i=0;i < events.Count;i++)             
                newEvents[i] = TypeDescriptor.CreateEvent(events[i].ComponentType, events[i], 
                    new CategoryAttribute(events[i].EventType.FullName));            
            events = new EventDescriptorCollection(newEvents);

            // Return event properties for the event descriptors.
            return eventPropertySvc.GetEventProperties(events);
        }        

        // Provides the name for the event property tab.
        public override string TabName
        {
            get
            {
                return "Events by Type";
            }
        }

        // Provides an image for the event property tab.
        public override System.Drawing.Bitmap Bitmap
        {
            get
            {
                Bitmap bmp = new Bitmap(DeserializeFromBase64Text(img));
                return bmp;
            }
        }

        // This method can be used to retrieve an Image from a block of 
        // Base64-encoded text.
        private Image DeserializeFromBase64Text(string text)
        {
            Image img = null;
            byte[] memBytes = Convert.FromBase64String(text);
            IFormatter formatter = new BinaryFormatter();
            MemoryStream stream = new MemoryStream(memBytes);
            img = (Image)formatter.Deserialize(stream);
            stream.Close();
            return img;
        }
    }
}

package EventsTabExample; 

import System.*;
import System.ComponentModel.*;
import System.ComponentModel.Design.*;
import System.Collections.*;
import System.Drawing.*;
import System.IO.*;
import System.Reflection.*;
import System.Runtime.Serialization.*;
import System.Runtime.Serialization.Formatters.Binary.*;
import System.Windows.Forms.*;
import System.Windows.Forms.Design.*;
   
// This component adds a TypeEventsTab to the Properties Window.
/** @attribute PropertyTabAttribute(TypeEventsTab.class, 
    PropertyTabScope.Document)
 */
public class TypeEventsTabComponent extends Component
{

    public TypeEventsTabComponent()
    {
    } //TypeEventsTabComponent
} //TypeEventsTabComponent
   
// This example events tab lists events by their delegate type.
/** @attribute System.Security.Permissions.PermissionSet(System.Security.
    Permissions.SecurityAction.Demand, Name = "FullTrust")
 */
public class TypeEventsTab extends System.Windows.Forms.Design.EventsTab
{
    /** @attribute BrowsableAttribute(true)
     */
    // This string contains a Base-64 encoded and serialized example 
    // property tab image.
    private String img = "AAEAAAD/////AQAAAAAAAAAMAgAAAFRTeXN0ZW0uRHJhd2luZy"
        + "wgVmVyc2lvbj0xLjAuMzMwMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVR"
        + "va2VuPWIwM2Y1ZjdmMTFkNTBhM2EFAQAAABVTeXN0ZW0uRHJhd2luZy5CaXRtYXAB"
        + "AAAABERhdGEHAgIAAAAJAwAAAA8DAAAAtgIAAAJCTbYCAAAAAAAANgAAACgAAAANA"
        + "AAAEAAAAAEAGAAAAAAAAAAAAMQOAADEDgAAAAAAAAAAAADO1tnO1tnO1tnO1tnO1t"
        + "nO1tnO1tnO1tnO1tnO1tnO1tnO1tnO1tn/ztbZztbZHh4eHh4eztbZztbZztbZztb"
        + "ZztbZztbZztbZztbZztbZ/87W2c7W2QDBAB4eHh4eHs7W2c7W2c7W2c7W2c7W2c7W"
        + "2c7W2c7W2f/O1tnO1tnO1tkAwQAeHh4eHh7O1tnO1tnO1tnO1tnO1tnO1tnO1tn/z"
        + "tbZztbZlJSU////AMEAHh4eHh4eztbZztbZztbZztbZztbZztbZ/87W2c7W2c7W2Z"
        + "SUlP///wDBAB4eHh4eHs7W2c7W2c7W2c7W2c7W2f/O1tnO1tnO1tnO1tmUlJT///8"
        + "AwQAeHh4eHh7O1tnO1tnO1tnO1tn/ztbZHh4eHh4eHh4eHh4eHh4e////AIAAHh4e"
        + "Hh4eztbZztbZztbZ/87W2ZSUlP///wDBAADBAADBAADBAADBAACAAB4eHh4eHs7W2"
        + "c7W2f/O1tnO1tmUlJT///8AwQAAgAAeHh4eHh7O1tnO1tnO1tnO1tnO1tn/ztbZztb"
        + "ZztbZlJSU////AMEAAIAAHh4eHh4eztbZztbZztbZztbZ/87W2c7W2c7W2c7W2ZSUl"
        + "P///wDBAACAAB4eHh4eHs7W2c7W2c7W2f/O1tnO1tnO1tnO1tnO1tmUlJT///8AwQA"
        + "AgAAeHh4eHh7O1tnO1tn/ztbZztbZztbZztbZztbZztbZlJSU////AMEAAIAAHh4eH"
        + "h4eztbZ/87W2c7W2c7W2c7W2c7W2c7W2c7W2ZSUlP///wDBAACAAB4eHs7W2f/O1tn"
        + "O1tnO1tnO1tnO1tnO1tnO1tnO1tnO1tnO1tnO1tnO1tnO1tn/Cw==";

    private IServiceProvider sp;

    public TypeEventsTab(IServiceProvider sp)
    {
        super(sp);
        this.sp = sp;
    } //TypeEventsTab

    // Returns the properties of the specified component extended with a 
    // CategoryAttribute reflecting the name of the type of the property.
    public System.ComponentModel.PropertyDescriptorCollection GetProperties(
        ITypeDescriptorContext context, Object component, 
        System.Attribute attributes[])
    {
        // Obtain an instance of the IEventBindingService.
        IEventBindingService eventPropertySvc = (IEventBindingService)sp.
            GetService(IEventBindingService.class.ToType());

        // Return if an IEventBindingService could not be obtained.
        if (eventPropertySvc == null) {
            return new PropertyDescriptorCollection(null);
        }

        // Obtain the events on the component.
        EventDescriptorCollection events = TypeDescriptor.
            GetEvents(component, attributes);

        // Create an array of the events, where each event is assigned 
        // a category matching its type.
        EventDescriptor newEvents[] = new EventDescriptor[events.get_Count()];

        for (int i = 0; i < events.get_Count(); i++) {
            newEvents.set_Item(i, TypeDescriptor.CreateEvent(events.
                get_Item(i).get_ComponentType(), events.get_Item(i),
                new Attribute[] { new CategoryAttribute(events.get_Item(i).
                get_EventType().get_FullName()) }));
        }
        events = new EventDescriptorCollection(newEvents);

        // Return event properties for the event descriptors.
        return eventPropertySvc.GetEventProperties(events);
    } //GetProperties

    // Provides the name for the event property tab.
    /** @property 
     */
    public String get_TabName()
    {
        return "Events by Type";
    } //get_TabName

    // Provides an image for the event property tab.
    /** @property
     */
    public System.Drawing.Bitmap get_Bitmap()
    {
        Bitmap bmp = new Bitmap(DeserializeFromBase64Text(img));

        return bmp;
    } //get_Bitmap

    // This method can be used to retrieve an Image from a block of 
    // Base64-encoded text.
    private Image DeserializeFromBase64Text(String text)
    {
         Image img = null;
         ubyte memBytes[] = Convert.FromBase64String(text);
         IFormatter formatter = new BinaryFormatter();
         MemoryStream stream =  new MemoryStream(memBytes);
         img =(Image)formatter.Deserialize(stream);
         stream.Close();
         return img;
    } //DeserializeFromBase64Text
} //TypeEventsTab

System.Object
   System.Windows.Forms.Design.PropertyTab
    System.Windows.Forms.Design.EventsTab

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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