ComponentEditor Kelas

Definisi

Ruang nama:

System.ComponentModel

Rakitan:

System.ComponentModel.TypeConverter.dll

Sumber:

BaseComponentEditor.cs

Menyediakan kelas dasar untuk editor komponen kustom.

public ref class ComponentEditor abstract

public abstract class ComponentEditor

type ComponentEditor = class

Public MustInherit Class ComponentEditor

Warisan

Object

ComponentEditor

Turunan

System.Windows.Forms.Design.WindowsFormsComponentEditor

Contoh

Contoh kode berikut menunjukkan contoh ComponentEditor implementasi.

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

// This example demonstrates how to implement a component editor that hosts 
// component pages and associate it with a component. This example also 
// demonstrates how to implement a component page that provides a panel-based 
// control system and Help keyword support.
namespace ComponentEditorExample
{
    // The ExampleComponentEditor displays two ExampleComponentEditorPage pages.
    public class ExampleComponentEditor : System.Windows.Forms.Design.WindowsFormsComponentEditor
    {
        // This method override returns an type array containing the type of 
        // each component editor page to display.
        protected override Type[] GetComponentEditorPages()
        {
            return new Type[] { typeof(ExampleComponentEditorPage),
                                typeof(ExampleComponentEditorPage) };
        }

        // This method override returns the index of the page to display when the 
        // component editor is first displayed.
        protected override int GetInitialComponentEditorPageIndex()
        {
            return 1;
        }
    }

    // This example component editor page type provides an example 
    // ComponentEditorPage implementation.
    internal class ExampleComponentEditorPage : System.Windows.Forms.Design.ComponentEditorPage
    {
        Label l1;
        Button b1;
        PropertyGrid pg1;

        public ExampleComponentEditorPage()
        {
            // Initialize the page, which inherits from Panel, and its controls.
            this.Size = new Size(400, 250);
            this.Icon = new Icon("myicon.ico");
            this.Text = "Example Page";

            b1 = new Button();
            b1.Size = new Size(200, 20);
            b1.Location = new Point(200, 0);
            b1.Text = "Set a random background color";
            b1.Click += new EventHandler(this.randomBackColor);
            this.Controls.Add(b1);

            l1 = new Label();
            l1.Size = new Size(190, 20);
            l1.Location = new Point(4, 2);
            l1.Text = "Example Component Editor Page";
            this.Controls.Add(l1);

            pg1 = new PropertyGrid();
            pg1.Size = new Size(400, 280);
            pg1.Location = new Point(0, 30);
            this.Controls.Add(pg1);
        }

        // This method indicates that the Help button should be enabled for this 
        // component editor page.
        public override bool SupportsHelp()
        {
            return true;
        }

        // This method is called when the Help button for this component editor page is pressed.
        // This implementation uses the IHelpService to show the Help topic for a sample keyword.
        public override void ShowHelp()
        {
            // The GetSelectedComponent method of a ComponentEditorPage retrieves the
            // IComponent associated with the WindowsFormsComponentEditor.
            IComponent selectedComponent = this.GetSelectedComponent();

            // Retrieve the Site of the component, and return if null.
            ISite componentSite = selectedComponent.Site;
            if (componentSite == null)
                return;

            // Acquire the IHelpService to display a help topic using a indexed keyword lookup.
            IHelpService helpService = (IHelpService)componentSite.GetService(typeof(IHelpService));
            if (helpService != null)
                helpService.ShowHelpFromKeyword("System.Windows.Forms.ComboBox");
        }

        // The LoadComponent method is raised when the ComponentEditorPage is displayed.
        protected override void LoadComponent()
        {
            this.pg1.SelectedObject = this.Component;
        }

        // The SaveComponent method is raised when the WindowsFormsComponentEditor is closing 
        // or the current ComponentEditorPage is closing.
        protected override void SaveComponent()
        {
        }

        // If the associated component is a Control, this method sets the BackColor to a random color.
        // This method is invoked by the button on this ComponentEditorPage.
        private void randomBackColor(object sender, EventArgs e)
        {
            if (typeof(System.Windows.Forms.Control).IsAssignableFrom(this.Component.GetType()))
            {
                // Sets the background color of the Control associated with the
                // WindowsFormsComponentEditor to a random color.
                Random rnd = new Random();
                ((System.Windows.Forms.Control)this.Component).BackColor =
                    Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255));
                pg1.Refresh();
            }
        }
    }

    // This example control is associated with the ExampleComponentEditor 
    // through the following EditorAttribute.
    [EditorAttribute(typeof(ExampleComponentEditor), typeof(ComponentEditor))]
    public class ExampleUserControl : System.Windows.Forms.UserControl
    {
    }
}

Keterangan

Editor komponen digunakan untuk mengedit komponen secara keseluruhan dan dapat digunakan untuk mengimplementasikan antarmuka pengguna yang mirip dengan halaman properti. Anda mengaitkan editor komponen dengan komponen dengan menggunakan EditorAttribute atribut .

Catatan Bagi Implementer

Ketika Anda mewarisi dari kelas ini, Anda harus mengambil EditComponent(Object) alih metode .

Konstruktor

ComponentEditor()

Menginisialisasi instans baru kelas ComponentEditor.

Metode

EditComponent(ITypeDescriptorContext, Object)	Mengedit komponen dan mengembalikan nilai yang menunjukkan apakah komponen dimodifikasi berdasarkan konteks tertentu.
EditComponent(Object)	Mengedit komponen dan mengembalikan nilai yang menunjukkan apakah komponen telah dimodifikasi.
Equals(Object)	Menentukan apakah objek yang ditentukan sama dengan objek saat ini. (Diperoleh dari Object)
GetHashCode()	Berfungsi sebagai fungsi hash default. (Diperoleh dari Object)
GetType()	Mendapatkan instans Type saat ini. (Diperoleh dari Object)
MemberwiseClone()	Membuat salinan dangkal dari yang saat ini Object. (Diperoleh dari Object)
ToString()	Mengembalikan string yang mewakili objek saat ini. (Diperoleh dari Object)