pollpost.cs

本系统是在asp版《在线文件管理器》的基础上设计制作

//------------------------------------------------------------------------------
// <copyright company="Telligent Systems">
//     Copyright (c) Telligent Systems Corporation.  All rights reserved.
// </copyright> 
//------------------------------------------------------------------------------

using System;
using System.Drawing;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;
using CommunityServer.Components;
using CommunityServer.Controls;
using CommunityServer.Discussions.Components;

namespace CommunityServer.Discussions.Controls.PostDisplay 
{

    /// <summary>
    /// The Vote control is allows for users to vote on topics. The results are stored in 
    /// a SQL Server table and a HTML graph is used to display the selections/percentages.
    /// </summary>
    [
    ToolboxData("<{0}:Vote runat=\"server\" />")
    ]
    public class PollPost : SkinnedWebControl 
    {

        string skinFilename = "Skin-Poll.ascx";
		Post post;
		PlaceHolder results;
		Button voteButton;
		PlaceHolder votedFor;
		bool enabled = false;
        CSContext csContext = CSContext.Current;
		DropDownList voteOptions;
        PollSummary pollSummary;
        int postID;

        // *********************************************************************
        //  PollPost
        //
        /// <summary>
        /// Constructor
        /// </summary>
        // ***********************************************************************/
        public PollPost(ForumPost post) : base() 
        {

            postID = post.PostID;
			this.post = post;
            pollSummary = Polls.GetPoll(post);

			// Assign a default template name
            if (SkinFilename == null)
                SkinFilename = skinFilename;

        }

        // *********************************************************************
        //  Initializeskin
        //
        /// <summary>
        /// Initialize the control template and populate the control with values
        /// </summary>
        // ***********************************************************************/
        override protected void InitializeSkin(Control skin) 
        {


            // Find the results place holder control
            //
            results = (PlaceHolder) skin.FindControl("Results");
			RenderVoteResults();

			Label lblTopic = skin.FindControl("Topic") as Label;
			if( lblTopic != null ) {
				if( pollSummary.Question != String.Empty )
					lblTopic.Text = pollSummary.Question;
				else
					lblTopic.Text = post.Subject;
			}

			Label lblDescription = skin.FindControl("Description") as Label;
			if( lblDescription != null ) {
				if( this.pollSummary.Description == String.Empty ) {
					lblDescription.Visible = false;
				}
				else {
					lblDescription.Text = pollSummary.Description;
				}
			}

			// Find the vote option control
			voteOptions = (DropDownList) skin.FindControl("VoteOptions");
			foreach (string key in pollSummary.Answers.Keys) {
				voteOptions.Items.Add(new ListItem( ((PollItem) pollSummary.Answers[key]).Answer, key));
			}

            // Wire up the vote button
            //
            voteButton = (Button) skin.FindControl("VoteButton");
			voteButton.Text = ResourceManager.GetString("PostDisplay_PollPost_buttonText");
            voteButton.Click += new EventHandler(VoteButton_Click);

			// Can they vote?
			if (!enabled) {
				Disable();
			}

			if ((!pollSummary.AllowMultipleVotes) && (pollSummary.HasVoted(csContext.User.UserID))) {
				votedFor = (PlaceHolder) skin.FindControl("VotedFor");
				votedFor.Controls.Add( new LiteralControl("<p/><b>You voted for: " + pollSummary.GetUserVote( csContext.User.UserID )+"</b>") );
				Disable();
			}

        }

		public void Enable() {
			voteOptions.Enabled = true;
			voteButton.Enabled = true;
		}

		public void Disable() {
			voteOptions.Enabled = false;
			voteButton.Enabled = false;
		}
		

        protected void RenderVoteResults() 
        {

			results.Controls.Clear();

            // Member Variables
            //
            int sum = 0;
            Table t = new Table();
			t.ID = "ResultsTable";
            t.CellPadding = 3;
            t.CellSpacing = 1;
            TableRow resultsRow = new TableRow();
            TableRow footerRow = new TableRow();
            TableCell resultsCell = new TableCell();
            TableCell footer = new TableCell();

            // Format the table
            //
            t.BorderWidth = 0;

            // Calculate the sum
            //
            foreach (string key in pollSummary.Answers.Keys)
				sum = sum + ((PollItem) pollSummary.Answers[key]).Total;

            // Calculate percentage
            //
            foreach (string key in pollSummary.Answers.Keys) 
            {

                // Internal variables/instances
                //
                double d = 0;
                int pollValue = 0;
                TableRow row = new TableRow();
                TableCell progressCell = new TableCell();
                TableCell percentageCell = new TableCell();
                ProgressBar bar = new ProgressBar();
				
                // Get the poll value
                //
                if (null != pollSummary.Answers[key])
                    pollValue = ((PollItem) pollSummary.Answers[key]).Total;

                // Percentage for this poll value
                //
                d = ((double)pollValue / (double)sum) * 100;

                // Set properties for each bar
                //
                bar.PercentageOfProgress = (int)d;

                // Special case 0
                //
                Label percentageText = new Label();
                percentageText.CssClass = "normalTextSmallBold";
                if ((double.IsNaN(d)) || (0 == d))
                    percentageText.Text = "(0%)<br>";
                else
                    percentageText.Text = "(" + d.ToString("##.#") + "%)<br>";

                // Add the bar and set properties of the cell
                //
                progressCell.CssClass = "txt3";
                progressCell.Controls.Add(new LiteralControl( ((PollItem) pollSummary.Answers[key]).Answer) );
                progressCell.Controls.Add(new LiteralControl(" &nbsp; "));
                progressCell.Controls.Add( percentageText );
                progressCell.Controls.Add(bar);
                progressCell.HorizontalAlign = HorizontalAlign.Left;
                progressCell.VerticalAlign = VerticalAlign.Top;
                progressCell.Wrap = false;

                // Add the cells to the row
                //
                row.Cells.Add(progressCell);

                // Add the row to the table
                //
                t.Rows.Add(row);

            }

            // What you voted for
            //
            resultsCell.ColumnSpan = 3;
            resultsCell.CssClass = "txt3";
            resultsCell.HorizontalAlign = HorizontalAlign.Right;

            // Set footer properties
            //
            Label totalVotes = new Label();
            totalVotes.Text = ResourceManager.GetString("PostDisplay_PollPost_totalVotes") + "<b>" + sum + "</b>";
            totalVotes.CssClass = "txt3";
            footer.Controls.Add(totalVotes);
            footer.ColumnSpan = 3;
            footer.HorizontalAlign = HorizontalAlign.Left;

            // Add footer cell and add to table
            //
            footerRow.Cells.Add(footer);
            t.Rows.Add(footerRow);

            results.Controls.Add(t);
        }

        void VoteButton_Click(Object sender, EventArgs e) 
        {
			// shouldn't get here
			if (pollSummary.HasVoted(csContext.User.UserID))
				return;

            Polls.Vote(postID, csContext.User.UserID, voteOptions.SelectedItem.Value);
			PollItem poll = (PollItem) pollSummary.Answers[voteOptions.SelectedItem.Value];

			// Increment our internal poll results
            //
			poll.Increment();

            // Change the display to HasVoted
            //
			Disable();

            RenderVoteResults();
        }

		
        // *********************************************************************
        //  ButtonText
        //
        /// <summary>
        /// Used to control the text on the button. Default is 'Vote'
        /// </summary>
        // ***********************************************************************/        
        public virtual String ButtonText 
        {
            get 
            {
                Object state = ViewState["ButtonText"];
                if ( state != null ) 
                {
                    return (String)state;
                }
                return ResourceManager.GetString("PostDisplay_PollPost_buttonText");
            }
            set 
            {
                ViewState["ButtonText"] = value;
            }
        }

		public bool Enabled {
			get {
				return enabled;
			}
			set {
				enabled = value;
			}
		}

        // *********************************************************************
        //  BarBackColor
        //
        /// <summary>
        /// Controls the back ground color of the rendered bar(s).
        /// </summary>
        // ***********************************************************************/        
        [
        System.ComponentModel.Category( "Style" ),
        ]
        public virtual Color BarBackColor 
        {
            get 
            {
                Object state = ViewState["BarBackColor"];
                if ( state != null ) 
                {
                    return (Color)state;
                }
                return Color.Empty;
            }
            set 
            {
                ViewState["BarBackColor"] = value;
            }
        }

        // *********************************************************************
        //  BarForeColor
        //
        /// <summary>
        /// Controls the foreground color of the rendered bar(s).
        /// </summary>
        // ***********************************************************************/        
        [
        System.ComponentModel.Category( "Style" ),
        ]
        public virtual Color BarForeColor 
        {
            get 
            {
                Object state = ViewState["BarForeColor"];
                if ( state != null ) 
                {
                    return (Color)state;
                }
                return Color.Empty;
            }
            set 
            {
                ViewState["BarForeColor"] = value;
            }
        }
    }
}