topic.aspx.cs

企业内部管理系统

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using infoWeb.WebModules.Accounts.Business;

namespace infoWeb.WebModules.Forums.Web
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class Topic : infoWeb.ThePhile.Web.PhilePage
	{
		protected System.Web.UI.WebControls.DataGrid RepliesGrid;
		protected System.Web.UI.WebControls.Label PageNumber;
		protected System.Web.UI.WebControls.Label TotalPages;
		protected System.Web.UI.WebControls.LinkButton FirstPage;
		protected System.Web.UI.WebControls.LinkButton PreviousPage;
		protected System.Web.UI.WebControls.LinkButton NextPage;
		protected System.Web.UI.WebControls.LinkButton LastPage;
		protected System.Web.UI.WebControls.LinkButton DeleteTopic;
		protected System.Web.UI.WebControls.HyperLink EditTopic;
		protected System.Web.UI.HtmlControls.HtmlTable TopicTable;
		protected System.Web.UI.WebControls.Label TopicAuthor;
		protected System.Web.UI.WebControls.Label TopicSubject;
		protected System.Web.UI.WebControls.Label TopicMessage;
		protected System.Web.UI.WebControls.Label TopicAuthorSignature;
		protected System.Web.UI.WebControls.Image TopicAuthorAvatar;
		protected System.Web.UI.WebControls.HyperLink TopicAuthorHomepage;
		protected System.Web.UI.WebControls.Label TopicDate;
		protected System.Web.UI.WebControls.Label TopicTime;
		protected System.Web.UI.WebControls.Label GridItemStyle;
		protected System.Web.UI.WebControls.Label GridAlternatingItemStyle;
		protected System.Web.UI.WebControls.HyperLink NewTopic;
		protected System.Web.UI.WebControls.HyperLink NewReply;
		protected Web.Controls.User.Header Header;

		private bool canModerateForums;

		protected void Page_Load(object sender, EventArgs e)
		{
			// check if the user has the permission to moderate the forums
			canModerateForums = (Context.User.Identity.IsAuthenticated &&
				((SitePrincipal)Context.User).HasPermission((int)ForumsPermissions.ModerateForums));

			string topicID = "-1";

			// get the ForumID from the QueryString
			if (Request.QueryString["TopicID"] != null)
				topicID = Request.Params["TopicID"];		
				
			// show or hide the Edit and Delete topic links, according to the permissions
			// of the current user
			EditTopic.NavigateUrl = "PostMessage.aspx?Action=EditTopic&TopicID=" + topicID.ToString();
			EditTopic.Visible = canModerateForums;
			DeleteTopic.Visible = canModerateForums;

			if (!Page.IsPostBack)
			{
				Business.Topic topic;
				
				// if the TopicKey value is not null, find the topic with that key and redirect to it
				if (Request.QueryString["TopicKey"] != null)
				{
					topic = new Business.Topic(Request.QueryString["TopicKey"].ToString());
					// if found, redirect to it, otherwise redirect to Default.aspx
					if (topic.ID != -1)
						Response.Redirect("Topic.aspx?TopicID=" + topic.ID.ToString(), true);
					else
						Response.Redirect("Default.aspx", true);
				}
				else	// otherwise it means that we have a TopicID to use directly
				{
					// set the links for posting a new topic/reply
					topic = new Business.Topic(int.Parse(topicID));
					NewTopic.NavigateUrl += topic.Forum.ID.ToString();
					NewReply.NavigateUrl += topic.ID.ToString();
					// set the navigation bar TopicID
					Header.TopicID = int.Parse(topicID);

					// if there is the paramter idicating to show the last page, set the number
					// in the label. This will be read in the BindGrid procedure
					if (Request.QueryString["Display"] != null && 
						Request.QueryString["Display"].ToString().ToLower() == "lastpage")
					{
						int pageSize = Configuration.ModuleConfig.GetSettings().RepliesPerPage;
						int totalPages = (int)Math.Ceiling((double)topic.Replies/pageSize);
						PageNumber.Text = totalPages.ToString();
					}

					// bind the data to the grid
					RepliesGrid.Attributes["TopicID"] = topicID;
					BindGrid();
				}
			}
		}

		public bool CanModerateForums
		{
			get { return canModerateForums; }
		}

		protected void BindGrid() 
		{
			// get the ForumID value from the Grid's attributes.
			// if null, redirect to the Default.aspx page
			if (RepliesGrid.Attributes["TopicID"] == null)
				Response.Redirect("Default.aspx", true);

			// get the current forum's ID
			int topicID = int.Parse(RepliesGrid.Attributes["TopicID"]);
			// get the number of topics per page
			int pageSize = Configuration.ModuleConfig.GetSettings().RepliesPerPage;

			// get the current replies page
			int pageNumber = (PageNumber.Text.Trim().Length == 0 ? 1 : int.Parse(PageNumber.Text));

			// retrieve and bind the records to the grid
			Business.Topic topic = new Business.Topic(topicID);
			DataSet replies = topic.GetReplies(pageNumber);
			RepliesGrid.DataSource = replies.Tables[0].DefaultView;
			RepliesGrid.DataBind();

			// show the total number of pages
			int totalPages = (int)Math.Ceiling((double)topic.Replies/pageSize);
			if (totalPages == 0) totalPages = 1;
			TotalPages.Text = totalPages.ToString();
			// enable/disable the links to navigate through the pages
			FirstPage.Enabled = (pageNumber != 1);
			PreviousPage.Enabled = (pageNumber != 1);
			NextPage.Enabled = (pageNumber != totalPages);
			LastPage.Enabled = (pageNumber != totalPages);

			// show also the topic, if this is the first page
			if (pageNumber == 1)
			{
				BindTopicControls(topicID);
				TopicTable.Visible = true;
				// if this is the first page, also swap the styles for the Item and AlternatingItem 
				// of the DataGrid, because the Topic has the Item style
				RepliesGrid.ItemStyle.CssClass = GridAlternatingItemStyle.Text;
				RepliesGrid.AlternatingItemStyle.CssClass = GridItemStyle.Text;
			}
			else
			{
				TopicTable.Visible = false;
				RepliesGrid.ItemStyle.CssClass = GridItemStyle.Text;
				RepliesGrid.AlternatingItemStyle.CssClass = GridAlternatingItemStyle.Text;
			}
		}

		private void BindTopicControls(int topicID)
		{
			// retrieve all the topic's info
			Business.Topic topic = new Business.Topic(topicID);
			Business.Member author = topic.Member;

			// show the data
			TopicAuthor.Text = GetAuthorText(author.Name, author.Email, author.ShowEmail);
			TopicAuthorAvatar.ImageUrl = author.AvatarUrl;
			TopicAuthorAvatar.Visible = (author.AvatarUrl.Length > 0);
			TopicAuthorHomepage.NavigateUrl = author.Homepage;
			TopicAuthorHomepage.Visible = (author.Homepage.Length > 0);
			TopicDate.Text = string.Format("{0:MM/dd/yy}", topic.AddedDate);
			TopicTime.Text = string.Format("{0:HH:mm:ss tt}", topic.AddedDate);
			TopicSubject.Text = topic.Subject;
			TopicMessage.Text = Business.Helper.ProcessSpecialTags(topic.Message);
			TopicAuthorSignature.Text = Business.Helper.ProcessSpecialTags(author.Signature);
		}

		public string GetAuthorText(object memberName, object eMail, object showEmail)
		{
			// return the member Name only or a link to its e-mail address, according to the ShowEmail value
			if (!Convert.ToBoolean(showEmail))
				return memberName.ToString();
			else
				return string.Format("<a href=\"mailto:{0}\">{1}</a>", eMail.ToString(), memberName.ToString());
		}

		public string ProcessTags(object rawText)
		{
			return Business.Helper.ProcessSpecialTags(rawText.ToString());
		}

		protected void RepliesGrid_Delete(object sender, DataGridCommandEventArgs e)
		{		
			// if the user cannot moderate forums redirect to the login page
			if (!canModerateForums)
			{
				Response.Redirect("/ThePhile/Modules/Users/Login.aspx?ShowError=true", true);
			}

			// delete this reply
			Business.Reply reply = new Business.Reply((int)RepliesGrid.DataKeys[e.Item.ItemIndex]);
			reply.Delete();
			BindGrid();
		}

		protected void DeleteTopic_Click(object sender, EventArgs e)
		{
			// if the user cannot moderate forums redirect to the login page
			if (!canModerateForums)
			{
				Response.Redirect("/ThePhile/Modules/Users/Login.aspx?ShowError=true", true);
			}

			int topicID = int.Parse(Request.QueryString["TopicID"]);
			Business.Topic topic = new Business.Topic(topicID);
			int forumID = topic.ForumID;
			topic.Delete();
			Response.Redirect("Forum.aspx?ForumID=" + forumID.ToString());
		}

		protected void RepliesGrid_PageChanged(object sender, CommandEventArgs e)
		{	
			if (PageNumber.Text.Trim().Length == 0) return;

			switch (e.CommandName)
			{
				case "FirstPage":
					PageNumber.Text = "1";
					break;
				case "PreviousPage":
					PageNumber.Text = (int.Parse(PageNumber.Text) -1).ToString();
					break;
				case "NextPage":
					PageNumber.Text = (int.Parse(PageNumber.Text) +1).ToString();
					break;
				case "LastPage":
					PageNumber.Text = TotalPages.Text;
					break;
			}
			
			// show the new page
			BindGrid();
		}


		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			base.OnInit(e);
			InitializeComponent();
			
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion
	}
}