LogDateBar.ascx.cs :  » Bloggers » dasBlog » newtelligence » DasBlog » Web » C# / CSharp Open Source

using System;
using System.Diagnostics;
using System.Globalization;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

using newtelligence.DasBlog.Runtime;
using newtelligence.DasBlog.Web.Core;

// paulb: 2006-09-02
// cleaned up the code and added next/previous day links

namespace newtelligence.DasBlog.Web{
  /// <summary>
  ///    Summary description for LogDateBar.
  /// </summary>
  public partial class LogDateBar : UserControl
  {

    // date navigation

    protected System.Resources.ResourceManager resmgr;

    protected override void OnLoad(EventArgs e) {
      base.OnLoad (e);

      resmgr = ApplicationResourceTable.Get();

      if (!Page.IsPostBack)
      {
        DateTime dt = new DateTime(DateTime.Now.Year, 1, 1);

        DateTime filteredDate = DateTime.UtcNow;

        string date = null;

        if (this.Request.QueryString["date"] != null)
        {
          date = this.Request.QueryString["date"];

          try
          {
            filteredDate = DateTime.ParseExact(date,"yyyy-MM-dd",CultureInfo.InvariantCulture);
          }
          catch (FormatException ex)
          {
            ErrorTrace.Trace(TraceLevel.Error, ex);
          }
        }

        // move the local/non-local date logic to one place

        if ( ((SharedBasePage)Page).SiteConfig.AdjustDisplayTimeZone && date == null) {
          newtelligence.DasBlog.Util.WindowsTimeZone tz = ((SharedBasePage)Page).SiteConfig.GetConfiguredTimeZone();
        filteredDate = tz.ToLocalTime(filteredDate);
        }

        // someone is trying to mess with us, let's play along
        if( filteredDate.Year > dt.Year || filteredDate.Year < dt.Year - 11){
          dt = new DateTime( filteredDate.Year, 1,1);
        }

        for (int i = 0; i > -12; i--)
        {
          this.DropDownListYear.Items.Add(dt.AddYears(i).ToString("yyyy"));
        }

        try{
          this.DropDownListYear.SelectedValue = filteredDate.Year.ToString();
        }catch( ArgumentOutOfRangeException ){
          //.. tried to set a year in the future, that's not in the list.
        }

        for (int i = 0; i < 12; i++)
        {
          this.DropDownListMonth.Items.Add(dt.AddMonths(i).ToString("MMMM"));
        }

        this.DropDownListMonth.SelectedIndex = filteredDate.Month - 1;

        int numDays = DateTime.DaysInMonth(Convert.ToInt32(this.DropDownListYear.SelectedItem.Text), this.DropDownListMonth.SelectedIndex + 1);
      
        for (int i = 1; i <= numDays; i++)
        {
          this.DropDownListDay.Items.Add(i.ToString());
        }

        this.DropDownListDay.SelectedIndex = filteredDate.Day - 1;

        // set the href for for the links
        
        DateTime nextDate= filteredDate.AddDays(1);
        DateTime previousDate = filteredDate.AddDays(-1);
                DateTime today = DateTime.Now;
        
        string requestUrl = this.Context.Request.Path;
        string dateFormat = "{0}?date={1:yyyy-MM-dd}";
        
        this.linkNext.HRef = String.Format( System.Globalization.CultureInfo.InvariantCulture, 
          dateFormat,
          requestUrl,
          nextDate);

        this.linkPrevious.HRef = String.Format( System.Globalization.CultureInfo.InvariantCulture, 
          dateFormat,
          requestUrl,
          previousDate);

                this.linkToday.HRef = String.Format(System.Globalization.CultureInfo.InvariantCulture,
                    dateFormat,
                    requestUrl,
                    today);
      }

      DataBind();
    }

    override protected void OnInit(EventArgs e)
    {
      this.buttonGo.Click += new System.EventHandler(this.buttonGo_Click);

      base.OnInit(e);
    }
    

    private void DropDownChanged()
    {
      string requestUrl = this.Context.Request.Path;
      string month = (this.DropDownListMonth.SelectedIndex + 1).ToString();
      string day = this.DropDownListDay.SelectedItem.Text;

      if (month.Length == 1) month = "0" + month;
      if (day.Length == 1) day = "0" + day;

      string responseUrl = String.Format("{0}?date={1}-{2}-{3}", 
        requestUrl, 
        this.DropDownListYear.SelectedItem,
        month, day);

      this.Context.Response.Redirect(responseUrl);
    }

    private void buttonGo_Click(object sender, System.EventArgs e)
    {
      this.DropDownChanged();
    }
  }
}