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IExtenderProviderService Interface

Fornece uma interface para adicionar e remover extensor provedores em tempo de design.

Namespace:  System.ComponentModel.Design
Assembly:  System (em System. dll)

public interface IExtenderProviderService

Typically, only components that have been Adicionado to a Offer providers extensor.The IExtenderProviderService allows you to extend this capability to objects that are not in the container.

The following example demosntrates using the IExtenderProviderService from a designer to add and remove an IExtenderProvider implementation.

using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;

namespace ExtenderServiceExample
{    
    // This designer adds a ComponentExtender extender provider, 
    // and removes it when the designer is destroyed.
    public class ExtenderServiceDesigner : System.Windows.Forms.Design.ControlDesigner
    {
        // A local reference to an obtained IExtenderProviderService.
        private IExtenderProviderService localExtenderServiceReference;
        // An IExtenderProvider that this designer supplies.
        private ComponentExtender extender;

        public ExtenderServiceDesigner()
        {
        }

        public override void Initialize(System.ComponentModel.IComponent component)
        {
            base.Initialize(component);

            // Attempts to obtain an IExtenderProviderService.
            IExtenderProviderService extenderService = (IExtenderProviderService)component.Site.GetService(typeof(IExtenderProviderService));
            if( extenderService != null )
            {
                // If the service was obtained, adds a ComponentExtender 
                // that adds an "ExtenderIndex" integer property to the 
                // designer's component.
                extender = new ComponentExtender();                
                extenderService.AddExtenderProvider( extender );
                localExtenderServiceReference = extenderService;
            }
            else
                MessageBox.Show("Could not obtain an IExtenderProviderService.");
        }

        protected override void Dispose(bool disposing)
        {
            // Removes any previously added extender provider.
            if( localExtenderServiceReference != null )
            {
                localExtenderServiceReference.RemoveExtenderProvider( extender );
                localExtenderServiceReference = null;
            }            
        }
    }

    // IExtenderProviderImplementation that adds an integer property 
    // named "ExtenderIndex" to any design-mode document object.
    [ProvidePropertyAttribute("ExtenderIndex", typeof(IComponent))]
    public class ComponentExtender : System.ComponentModel.IExtenderProvider
    {
        // Stores the value of the property to extend a component with.
        public int index = 0;        

        public ComponentExtender()
        {
        }

        public bool CanExtend(object extendee)
        {         
            // Extends any type of object.
            return true;
        }

        public int GetExtenderIndex(IComponent component)
        {
            return index;
        }

        public void SetExtenderIndex(IComponent component, int index)
        {
            this.index = index;
        }
    }

    // Example UserControl associated with the ExtenderServiceDesigner.
    [DesignerAttribute(typeof(ExtenderServiceDesigner))]
    public class ExtenderServiceTestControl : System.Windows.Forms.UserControl
    {		
        public ExtenderServiceTestControl()
        {						
        }
    }
}


package ExtenderServiceExample;
import System.*;
import System.Collections.*;
import System.ComponentModel.*;
import System.ComponentModel.Design.*;
import System.Windows.Forms.*;
import System.Windows.Forms.Design.*;

// This designer adds a ComponentExtender extender provider, 
// and removes it when the designer is destroyed.
public class ExtenderServiceDesigner extends 
    System.Windows.Forms.Design.ControlDesigner
{
    // A local reference to an obtained IExtenderProviderService.
    private IExtenderProviderService localExtenderServiceReference;

    // An IExtenderProvider that this designer supplies.
    private ComponentExtender extender;

    public ExtenderServiceDesigner()
    {
    } //ExtenderServiceDesigner

    public void Initialize(System.ComponentModel.IComponent component)
    {
        super.Initialize(component);

        // Attempts to obtain an IExtenderProviderService.
        IExtenderProviderService extenderService = (IExtenderProviderService)
            component.get_Site().GetService(IExtenderProviderService.class.
            ToType());
        if (extenderService != null) {
            // If the service was obtained, adds a ComponentExtender 
            // that adds an "ExtenderIndex" integer property to the 
            // designer's component.
            extender = new ComponentExtender();
            extenderService.AddExtenderProvider(extender);
            localExtenderServiceReference = extenderService;
        }
        else {
            MessageBox.Show("Could not obtain an IExtenderProviderService.");
        }
    } //Initialize

    protected void Dispose(boolean disposing)
    {
        // Removes any previously added extender provider.
        if (localExtenderServiceReference != null) {
            localExtenderServiceReference.RemoveExtenderProvider(extender);
            localExtenderServiceReference = null;
        }
    } //Dispose
} //ExtenderServiceDesigner

// IExtenderProviderImplementation that adds an integer property 
// named "ExtenderIndex" to any design-mode document object.
/** @ attribute ProvidePropertyAttribute("ExtenderIndex", 
    IComponent.class.ToType())
 */
public class ComponentExtender implements 
    System.ComponentModel.IExtenderProvider
{
    // Stores the value of the property to extend a component with.
    public int index = 0;

    public ComponentExtender()
    {
    } //ComponentExtender

    public boolean CanExtend(Object extendee)
    {
        // Extends any type of object.
        return true;
    } //CanExtend

    public int GetExtenderIndex(IComponent component)
    {
        return index;
    } //GetExtenderIndex

    public void SetExtenderIndex(IComponent component, int index)
    {
        this.index = index;
    } //SetExtenderIndex
} //ComponentExtender

// Example UserControl associated with the ExtenderServiceDesigner.
/** @ attribute DesignerAttribute(ExtenderServiceDesigner.class.ToType())
 */
public class ExtenderServiceTestControl extends 
    System.Windows.Forms.UserControl
{
    public ExtenderServiceTestControl()
    {
    } //ExtenderServiceTestControl
} //ExtenderServiceTestControl


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