学步园

using System;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.ComponentModel.Design;

namespace Sdtcn.WebControls
{
    /**//**//**//// <summary>
    /// CustomCalendar 的摘要说明。
    /// </summary>
    public class CustomCalendar : CompositeControl
    {
        private TextBox            _calendarTextBox;
        private HtmlInputButton _selectInputButton;
        private Calendar        _calendar;

        private static readonly object EventSelectChanged = new object();

        private string display
        {
            get
            {
                if(ViewState["Display"] == null)
                    return "none";
                else
                    return ViewState["Display"].ToString();
            }
            set
            {
                ViewState["Display"] = value;
            }
        }

        代理子控件的属性代理子控件的属性#region 代理子控件的属性
        [
        Bindable(true),
        Category("Appearance"),
        DefaultValue(""),
        Description("")
        ]
        public string CalendarText
        {
            get
            {
                EnsureChildControls();
                return _calendarTextBox.Text;
            }
        }

        [
        Bindable(true),
        Category("Appearance"),
        DefaultValue("Select"),
        Description("选择日期按钮的名称")
        ]
        public string SelectButtonText
        {
            get
            {
                EnsureChildControls();
                return _selectInputButton.Value;
            }
            set
            {
                EnsureChildControls();
                _selectInputButton.Value = value;
            }
        }


        #endregion

        事件事件#region 事件

        [
        Category("Action"),
        Description("选择日期后触发的事件")
        ]
        public event EventHandler SelectChanged
        {
            add
            {
                Events.AddHandler(EventSelectChanged,value);
            }
            remove
            {
                Events.RemoveHandler(EventSelectChanged,value);
            }
        }

        protected virtual void OnSelectChanged(object sender, EventArgs e) 
        {
            EventHandler selectChangedHandler = (EventHandler)Events[EventSelectChanged];
            if(selectChangedHandler != null)
            {
                selectChangedHandler(this,e);
            }
        }

        #endregion

        
        private void _calendar_SelectionChanged(object sender, EventArgs e) 
        {
            _calendarTextBox.Text = _calendar.SelectedDate.ToShortDateString();

            System.Web.UI.Control div = Page.FindControl("divCalendar");

            if(div is HtmlGenericControl)
            {
                ((HtmlGenericControl)div).Style.Add("display","none");
            }

            OnSelectChanged(sender,e);

            display = "none";
        }

        private void _calendar_VisibleMonthChanged(Object sender, MonthChangedEventArgs e)
        {
            display = "block";
        }

        public CustomCalendar()
        {}

        protected override void CreateChildControls()
        {
            Controls.Clear();

            _calendarTextBox = new TextBox();
            _calendarTextBox.ID = "calendarTextBox";
            _calendarTextBox.ReadOnly = true;

            _selectInputButton = new HtmlInputButton("button");
            _selectInputButton.Attributes.Add("Onclick","OnClick()");
            
            _calendar = new Calendar();
            _calendar.SelectionChanged += new EventHandler(_calendar_SelectionChanged);
            _calendar.VisibleMonthChanged += new MonthChangedEventHandler(_calendar_VisibleMonthChanged);

            this.Controls.Add(_calendarTextBox);
            this.Controls.Add(_selectInputButton);
            this.Controls.Add(_calendar);
        }

        protected override void OnPreRender(EventArgs e)