DateChooser源码--DateTimeStringEditor.cs

using System;
using System.ComponentModel;
using System.Drawing.Design;
using System.Security.Permissions;
using System.Windows.Forms;
using System.Windows.Forms.Design;
namespace CNBlogs.DCT.THIN.Design
{
 [SecurityPermission(SecurityAction.Demand, UnmanagedCode=true)]
 public class DateTimeStringEditor : UITypeEditor
 {
  // Methods
  public DateTimeStringEditor()
  {
  }

  public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
  {
   if (provider != null)
   {
    IWindowsFormsEditorService service1 = (IWindowsFormsEditorService) provider.GetService(typeof(IWindowsFormsEditorService));
    if (service1 == null)
    {
     return value;
    }
    if (this.dateTimeUI == null)
    {
     this.dateTimeUI = new DateTimeUI();
    }
    this.dateTimeUI.Start(service1, value);
    service1.DropDownControl(this.dateTimeUI);
    value = this.dateTimeUI.Value;
    this.dateTimeUI.End();
   }
   if(value is DateTime)
    return ((DateTime)value).ToString("yyyy-MM-dd");
   else
    return value.ToString();
  }

  public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
  {
   return UITypeEditorEditStyle.DropDown;
  }

  // Fields
  private DateTimeUI dateTimeUI;

  // Nested Types
  private class DateTimeUI : Control
  {
   // Methods
   public DateTimeUI()
   {
    this.btnClear = new Button();
    this.monthCalendar = new DateTimeMonthCalendar();
    this.InitializeComponent();
    base.Size = new System.Drawing.Size(this.monthCalendar.SingleMonthSize.Width,this.monthCalendar.SingleMonthSize.Height + 30);
    this.monthCalendar.Resize += new EventHandler(this.MonthCalResize);
    

   }

   public void End()
   {
    this.edSvc = null;
    this.value = null;
   }

   private void InitializeComponent()
   {
    this.btnClear.Text = "清空";
    //this.btnClear.Anchor = AnchorStyles.Bottom;
    this.btnClear.BackColor = System.Drawing.Color.MidnightBlue;
    this.btnClear.ForeColor = System.Drawing.Color.White;
    this.btnClear.Dock = DockStyle.Bottom;
    this.btnClear.Click += new EventHandler(this.OnbtnClearClick);

    //this.monthCalendar.MinDate = DateTime.MinValue;
    this.monthCalendar.DateSelected += new DateRangeEventHandler(this.OnDateSelected);
    this.monthCalendar.KeyDown += new KeyEventHandler(this.MonthCalKeyDown);
    base.Controls.Add(this.btnClear);
    base.Controls.Add(this.monthCalendar);
   }

   private void MonthCalKeyDown(object sender, KeyEventArgs e)
   {
    if (e.KeyCode == Keys.Return)
    {
     this.OnDateSelected(sender, null);
    }
   }

   private void MonthCalResize(object sender, EventArgs e)
   {
    base.Size = new System.Drawing.Size(this.monthCalendar.Size.Width,this.monthCalendar.Size.Height + 30);
    
   }
   private void OnbtnClearClick(object sender,EventArgs e)
   {
    this.value = "";
    this.edSvc.CloseDropDown();
   }

   private void OnDateSelected(object sender, DateRangeEventArgs e)
   {
    this.value = this.monthCalendar.SelectionStart;
    this.edSvc.CloseDropDown();
   }

   protected override void OnGotFocus(EventArgs e)
   {
    base.OnGotFocus(e);
    this.monthCalendar.Focus();
   }

   public void Start(IWindowsFormsEditorService edSvc, object value)
   {
    this.edSvc = edSvc;
    this.value = value;
    if (value != null)
    {
     DateTime time1 = DateTime.Today;
     try
     {
      time1 = DateTime.Parse(value.ToString());
     }
     catch
     {
     }
     if(time1 < monthCalendar.MinDate)
      this.monthCalendar.SetDate(this.monthCalendar.MinDate);
     else if(time1 > monthCalendar.MaxDate)
      this.monthCalendar.SetDate(monthCalendar.MaxDate);
     else
      this.monthCalendar.SetDate(time1);

    }
   }

   // Properties
   public object Value
   {
    get
    {
     return this.value;
    }
   }

   // Fields
   private IWindowsFormsEditorService edSvc;
   private Button btnClear;
   private MonthCalendar monthCalendar;
   private object value;

   // Nested Types
   private class DateTimeMonthCalendar : MonthCalendar
   {
    // Methods
    public DateTimeMonthCalendar()
    {
    }

    protected override bool IsInputKey(Keys keyData)
    {
     Keys keys1 = keyData;
     if (keys1 == Keys.Return)
     {
      return true;
     }
     return base.IsInputKey(keyData);
    }

   }
  }
 }
}