faceeditor.cs

中文名：Windows Forms 程序设计 英文名：Windows Forms Programming in c# 作者： Chris Sells 翻译： 荣耀 蒋贤哲 出版社：人民

#region Using directives

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing.Design;
using System.Text;
using System.Windows.Forms.Design;

#endregion

namespace AlarmClockControlLibrary {
  public class FaceEditor : UITypeEditor {

    // If the UI editor control is resizable, override this 
    // property to include a sizing grip on the Property
    // Browser drop down
    public override bool IsDropDownResizable {
      get { return true; }
    }

    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context) {
      // Specify a drop-down UITypeEditor
      return UITypeEditorEditStyle.DropDown;
    }

    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) {

      if( (context != null) && (provider != null) ) {
        // Access the property browser’s UI display service
        IWindowsFormsEditorService editorService = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));

        if( editorService != null ) {
          // Create an instance of the UI editor control
          // passing a reference to the editor service
          FaceEditorControl dropDownEditor = new FaceEditorControl(editorService);

          // Pass the UI editor control the current property value
          dropDownEditor.Face = (ClockFace)value;

          // Display the UI editor control
          editorService.DropDownControl(dropDownEditor);

          // Return the new property value from the UI editor control
          return dropDownEditor.Face;
        }
      }
      return base.EditValue(context, provider, value);
    }
  }
}