alphapicker.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.Collections;
using System.Collections.Specialized;
using System.Web;
using System.Configuration;
using System.Web.UI;
using System.Web.UI.Design;
using System.Web.UI.WebControls;
using CommunityServer;
using CommunityServer.Components;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.IO;

namespace CommunityServer.Controls {
    [
    ParseChildren(true),
    Designer(typeof(AlphaPickerDesigner))
    ]
    public class AlphaPicker : WebControl, INamingContainer {

        string currentLetter = ResourceManager.GetString("AlphaPicker_All");
        string spacer = ResourceManager.GetString("AlphaPicker_Spacer");

        // *********************************************************************
        //  CreateChildControls
        //
        /// <summary>
        /// Renders the Alpha picker options
        /// </summary>
        /// 
        // ********************************************************************/ 
        protected override void CreateChildControls() {
            Label label;

            // If spacer is nothing
            //
            if (spacer == "")
                spacer = "&nbsp;";

            // Add the series of linkbuttons
            char chrStart = 'A';
            char chrStop = 'Z';

            // Loop through all the characters
            for (int iLoop = chrStart; iLoop <= chrStop; iLoop++) {
                Controls.Add(CreateLetteredLinkButton(((char) iLoop).ToString()));

                label = new Label();
                label.Text = spacer;
                Controls.Add(label);
            }

            Controls.Add(CreateLetteredLinkButton(ResourceManager.GetString("AlphaPicker_All")));

        }

        // *********************************************************************
        //  CreateLetteredLinkButton
        //
        /// <summary>
        /// Creates link buttons
        /// </summary>
        /// 
        // ********************************************************************/ 
        private LinkButton CreateLetteredLinkButton(String buttonText) {

            // Add a new link button
            LinkButton btnTmp = new LinkButton();
            btnTmp.Text = buttonText;

            if (buttonText == ResourceManager.GetString("AlphaPicker_All"))
                btnTmp.CommandArgument = buttonText;
            else
                btnTmp.CommandArgument = buttonText + "*";

            btnTmp.Click += new System.EventHandler(Letter_Clicked);

            return btnTmp;
        }

        // *********************************************************************
        //  Letter_Clicked
        //
        /// <summary>
        /// Event raised when a letter has been clicked by the end user
        /// </summary>
        /// 
        // ********************************************************************/
        public event System.EventHandler Letter_Changed;

        // *********************************************************************
        //  Letter_Clicked
        //
        /// <summary>
        /// Event raised when a letter is clicked upon.
        /// </summary>
        /// 
        // ********************************************************************/
        private void Letter_Clicked(Object sender, EventArgs e) {

            SelectedLetter = ((LinkButton) sender).CommandArgument;

            if (null != Letter_Changed)
                Letter_Changed(sender, e);

        }

        // *********************************************************************
        //  SelectedLetter
        //
        /// <summary>
        /// Property that returns the currently selected Letter
        /// </summary>
        /// 
        // ********************************************************************/
        public string SelectedLetter {
            get {
                if (ViewState["SelectedLetter"] == null)
                    return currentLetter;

                return (string) ViewState["SelectedLetter"];
            }
            set {
                ViewState["SelectedLetter"] = value;
            }
        }
    }

    public class AlphaPickerDesigner : ControlDesigner {

        public override string GetDesignTimeHtml() {
            // Create the controls
            //
            ControlCollection controls = ((Control) Component).Controls;

            return "TODO: Design time";

        }

        public override void Initialize(IComponent component) {
            base.Initialize(component);
        }
    }
}