BulletedList.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / BulletedList.cs / 1 / BulletedList.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.Collections.Specialized;
    using System.ComponentModel;
    using System.Globalization;
    using System.Web; 
    using System.Web.UI;
    using System.Security.Permissions; 
    using System.Web.UI.WebControls; 
    using System.Drawing.Design;
    using System.Web.Util; 



    ///  
    ///     Generates a bulleted list.
    ///  
    [DefaultProperty("BulletStyle")] 
    [DefaultEvent("Click")]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [Designer("System.Web.UI.Design.WebControls.BulletedListDesigner, " + AssemblyRef.SystemDesign)]
    [SupportsEventValidation]
    public class BulletedList : ListControl, IPostBackEventHandler 
#if ORCAS
        , IItemPaginationInfo, IPaginationContainer 
#endif 
    {
 
        private static readonly object EventClick = new object();

        private bool _cachedIsEnabled;
        private int _firstItem; 
        private int _itemCount;
 
 
        /// 
        public BulletedList() { 
            _firstItem = 0;
            _itemCount = -1;
        }
 

        ///  
        ///    Gets the value of the base classes AutoPostBack propert. 
        ///       AutoPostBack is not applicable to the bulleted list control
        ///  
        [
        Browsable(false),
        EditorBrowsable(EditorBrowsableState.Never)
        ] 
        public override bool AutoPostBack {
            get { 
                return base.AutoPostBack; 
            }
            set { 
                throw new NotSupportedException(SR.GetString(SR.Property_Set_Not_Supported, "AutoPostBack", this.GetType().ToString()));
            }
        }
 

        ///  
        ///     Gets or sets a value indicating the style of bullet to be 
        ///        applied to the list.
        ///  
        [
        WebCategory("Appearance"),
        DefaultValue(BulletStyle.NotSet),
        WebSysDescription(SR.BulletedList_BulletStyle) 
        ]
        public virtual BulletStyle BulletStyle { 
            get { 
                object o = ViewState["BulletStyle"];
                return((o == null) ? BulletStyle.NotSet : (BulletStyle)o); 
            }
            set {
                if (value < BulletStyle.NotSet || value > BulletStyle.CustomImage) {
                    throw new ArgumentOutOfRangeException("value"); 
                }
                ViewState["BulletStyle"] = value; 
            } 
        }
 

        /// 
        ///    Gets or sets the source of the image used for an
        ///       Image styled bulleted list. 
        /// 
        [ 
        WebCategory("Appearance"), 
        DefaultValue(""),
        Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)), 
        UrlProperty(),
        WebSysDescription(SR.BulletedList_BulletImageUrl)
        ]
        public virtual string BulletImageUrl { 
            get {
                object o = ViewState["BulletImageUrl"]; 
                return((o == null) ? string.Empty : (string)o); 
            }
            set { 
                ViewState["BulletImageUrl"] = value;
            }
        }
 

        ///  
        ///    Gets the EmptyControlCollection. 
        /// 
        public override ControlCollection Controls { 
            get {
                return new EmptyControlCollection(this);
            }
        } 

 
        ///  
        ///    Gets or sets the display mode of the bulleted list.
        ///  
        [
        WebCategory("Behavior"),
        DefaultValue(BulletedListDisplayMode.Text),
        WebSysDescription(SR.BulletedList_BulletedListDisplayMode) // 
        ]
        public virtual BulletedListDisplayMode DisplayMode { 
            get { 
                object o = ViewState["DisplayMode"];
                return ((o == null) ? BulletedListDisplayMode.Text : (BulletedListDisplayMode)o); 
            }
            set {
                if (value < BulletedListDisplayMode.Text || value > BulletedListDisplayMode.LinkButton) {
                    throw new ArgumentOutOfRangeException("value"); 
                }
                ViewState["DisplayMode"] = value; 
            } 
        }
 

        /// 
        ///    Gets or sets the value at which an ordered list should
        ///       begin its numbering. 
        /// 
        [ 
        WebCategory("Appearance"), 
        DefaultValue(1),
        WebSysDescription(SR.BulletedList_FirstBulletNumber) 
        ]
        public virtual int FirstBulletNumber {
            get {
                object o = ViewState["FirstBulletNumber"]; 
                return((o == null) ? 1 : (int)o);
            } 
            set { 
                ViewState["FirstBulletNumber"] = value;
            } 
        }


        ///  
        ///    Gets the value of selected index.  Not applicable to the
        ///       bulleted list control. 
        ///  
        [
        Bindable(false), 
        EditorBrowsable(EditorBrowsableState.Never)
        ]
        public override int SelectedIndex {
            get { 
                return base.SelectedIndex;
            } 
            set { 
                throw new NotSupportedException(SR.GetString(SR.BulletedList_SelectionNotSupported));
            } 
        }


        ///  
        ///    Gets the selected item.  Not applicable to the
        ///       bulleted list control. 
        ///  
        [
        EditorBrowsable(EditorBrowsableState.Never) 
        ]
        public override ListItem SelectedItem {
            get {
                return base.SelectedItem; 
            }
        } 
 
        [
        Bindable(false), 
        EditorBrowsable(EditorBrowsableState.Never)
        ]
        public override string SelectedValue {
            get { 
                return base.SelectedValue;
            } 
            set { 
                throw new NotSupportedException(SR.GetString(SR.BulletedList_SelectionNotSupported));
            } 
        }


        ///  
        ///    Gets the HtmlTextWriterTag value that corresponds
        ///       to the particular bulleted list. 
        ///  
        protected override HtmlTextWriterTag TagKey {
            get { 
                return TagKeyInternal;
            }
        }
 
        internal HtmlTextWriterTag TagKeyInternal {
            get { 
                switch (BulletStyle) { 
                    // Ordered Lists
                    case BulletStyle.LowerAlpha: 
                    case BulletStyle.UpperAlpha:
                    case BulletStyle.LowerRoman:
                    case BulletStyle.UpperRoman:
                    case BulletStyle.Numbered: 
                        return HtmlTextWriterTag.Ol;
                    // Unordered Lists 
                    case BulletStyle.Square: 
                    case BulletStyle.Circle:
                    case BulletStyle.Disc: 
                        return HtmlTextWriterTag.Ul;
                    // Image Lists
                    case BulletStyle.CustomImage:
                        return HtmlTextWriterTag.Ul; 
                    // Not Set
                    case BulletStyle.NotSet: 
                        // NotSet is specified as an unordered list. 
                        return HtmlTextWriterTag.Ul;
                    default: 
                        Debug.Assert(false, "Invalid BulletStyle");
                        return HtmlTextWriterTag.Ol;
                }
            } 
        }
 
 
        /// 
        ///    Gets or sets the Target window when the 
        ///       list is displayed as Hyperlinks.
        /// 
        [
        WebCategory("Behavior"), 
        DefaultValue(""),
        WebSysDescription(SR.BulletedList_Target), 
        TypeConverter(typeof(TargetConverter)) 
        ]
        public virtual string Target { 
            get {
                object o = ViewState["Target"];
                return ((o == null) ? string.Empty : (string)o);
            } 
            set {
                ViewState["Target"] = value; 
            } 
        }
 
        [
        EditorBrowsable(EditorBrowsableState.Never)
        ]
        public override string Text { 
            get {
                return base.Text; 
            } 
            set {
                throw new NotSupportedException(SR.GetString(SR.BulletedList_TextNotSupported)); 
            }
        }

 
        /// 
        ///    Occurs when the a link button is clicked. 
        ///  
        [
        WebCategory("Action"), 
        WebSysDescription(SR.BulletedList_OnClick)
        ]
        public event BulletedListEventHandler Click {
            add { 
                Events.AddHandler(EventClick, value);
            } 
            remove { 
                Events.RemoveHandler(EventClick, value);
            } 
        }


        ///  
        ///    Adds HTML attributes that need to be rendered.
        ///  
        protected override void AddAttributesToRender(HtmlTextWriter writer) { 
            bool addBulletNumber = false;
 
            switch (BulletStyle) {
                case BulletStyle.NotSet:
                    break;
                case BulletStyle.Numbered: 
                    writer.AddStyleAttribute(HtmlTextWriterStyle.ListStyleType, "decimal");
                    addBulletNumber = true; 
                    break; 
                case BulletStyle.LowerAlpha:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.ListStyleType, "lower-alpha"); 
                    addBulletNumber = true;
                    break;
                case BulletStyle.UpperAlpha:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.ListStyleType, "upper-alpha"); 
                    addBulletNumber = true;
                    break; 
                case BulletStyle.LowerRoman: 
                    writer.AddStyleAttribute(HtmlTextWriterStyle.ListStyleType, "lower-roman");
                    addBulletNumber = true; 
                    break;
                case BulletStyle.UpperRoman:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.ListStyleType, "upper-roman");
                    addBulletNumber = true; 
                    break;
                case BulletStyle.Disc: 
                    writer.AddStyleAttribute(HtmlTextWriterStyle.ListStyleType, "disc"); 
                    break;
                case BulletStyle.Circle: 
                    writer.AddStyleAttribute(HtmlTextWriterStyle.ListStyleType, "circle");
                    break;
                case BulletStyle.Square:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.ListStyleType, "square"); 
                    break;
                case BulletStyle.CustomImage: 
                    String url = ResolveClientUrl(BulletImageUrl); 
                    writer.AddStyleAttribute(HtmlTextWriterStyle.ListStyleImage, "url(" + HttpUtility.UrlPathEncode(url) + ")");
                    break; 
                default:
                    Debug.Assert(false, "Invalid BulletStyle");
                    break;
            } 
            int firstBulletNumber = FirstBulletNumber;
            if ((addBulletNumber == true) && (firstBulletNumber != 1)) { 
                writer.AddAttribute("start", firstBulletNumber.ToString(CultureInfo.InvariantCulture)); 
            }
            base.AddAttributesToRender(writer); 
        }

        private string GetPostBackEventReference(string eventArgument) {
            if (CausesValidation && Page.GetValidators(ValidationGroup).Count > 0) { 
                return ClientScriptManager.JscriptPrefix + Util.GetClientValidatedPostback(this, ValidationGroup, eventArgument);
            } else { 
                return Page.ClientScript.GetPostBackClientHyperlink(this, eventArgument, true); 
            }
        } 

        /// 
        /// Raises the Click event.
        ///  
        protected virtual void OnClick(BulletedListEventArgs e) {
            BulletedListEventHandler onClickHandler = (BulletedListEventHandler)Events[EventClick]; 
            if (onClickHandler != null) 
                onClickHandler(this, e);
        } 


        /// 
        ///     Writes the text of each bullet according to the list's display mode. 
        /// 
        protected virtual void RenderBulletText(ListItem item, int index, HtmlTextWriter writer) { 
            switch (DisplayMode) { 
                case BulletedListDisplayMode.Text:
                    if (!item.Enabled) { 
                        writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
                        writer.RenderBeginTag(HtmlTextWriterTag.Span);
                    }
                    HttpUtility.HtmlEncode(item.Text, writer); 
                    if (!item.Enabled) {
                        writer.RenderEndTag(); 
                    } 
                    break;
 
                case BulletedListDisplayMode.HyperLink:
                    if (_cachedIsEnabled && item.Enabled) {
                        writer.AddAttribute(HtmlTextWriterAttribute.Href, ResolveClientUrl(item.Value));
                        string target = Target; 
                        if (!String.IsNullOrEmpty(target)) {
                            writer.AddAttribute(HtmlTextWriterAttribute.Target, Target); 
                        } 
                    }
                    else { 
                        writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
                    }

                    RenderAccessKey(writer, AccessKey); 
                    writer.RenderBeginTag(HtmlTextWriterTag.A);
                    HttpUtility.HtmlEncode(item.Text, writer); 
                    writer.RenderEndTag(); 
                    break;
 
                case BulletedListDisplayMode.LinkButton:
                    if (_cachedIsEnabled && item.Enabled) {
                        writer.AddAttribute(HtmlTextWriterAttribute.Href, GetPostBackEventReference(index.ToString(CultureInfo.InvariantCulture)));
                    } 
                    else {
                        writer.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled"); 
                    } 

                    RenderAccessKey(writer, AccessKey); 
                    writer.RenderBeginTag(HtmlTextWriterTag.A);
                    HttpUtility.HtmlEncode(item.Text, writer);
                    writer.RenderEndTag();
                    break; 

                default: 
                    Debug.Assert(false, "Invalid BulletedListDisplayMode"); 
                    break;
            } 

        }

        internal void RenderAccessKey(HtmlTextWriter writer, string AccessKey) { 
            string s = AccessKey;
            if (s.Length > 0) { 
                writer.AddAttribute(HtmlTextWriterAttribute.Accesskey, s); 
            }
        } 

#if ORCAS
        protected internal override void Render(HtmlTextWriter writer) {
            // Don't render anything if the control is empty 
            if (VisibleItemCount == 0) {
                return; 
            } 

            base.Render(writer); 
        }
#else
        protected internal override void Render(HtmlTextWriter writer) {
            // Don't render anything if the control is empty 
            if (Items.Count == 0) {
                return; 
            } 

            base.Render(writer); 
        }
#endif

 

        ///  
        ///    Renders the ListItems as bullets in the bulleted list. 
        /// 
        protected internal override void RenderContents(HtmlTextWriter writer) { 
            _cachedIsEnabled = IsEnabled;

            if (_itemCount == -1) {
                for (int i = 0; i < Items.Count; i++) { 
                    Items[i].RenderAttributes(writer);
                    writer.RenderBeginTag(HtmlTextWriterTag.Li); 
                    RenderBulletText(Items[i], i, writer); 
                    writer.RenderEndTag();
                } 
            }
            else {
                for (int i = _firstItem; i < _firstItem + _itemCount; i++) {
                    Items[i].RenderAttributes(writer); 
                    writer.RenderBeginTag(HtmlTextWriterTag.Li);
                    RenderBulletText(Items[i], i, writer); 
                    writer.RenderEndTag(); 
                }
            } 
        }


        protected virtual void RaisePostBackEvent(string eventArgument) { 
            ValidateEvent(this.UniqueID, eventArgument);
 
            if (CausesValidation) { 
                Page.Validate(ValidationGroup);
            } 
            OnClick(new BulletedListEventArgs(Int32.Parse(eventArgument, CultureInfo.InvariantCulture)));
        }

        void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) { 
            RaisePostBackEvent(eventArgument);
        } 
#if ORCAS 
        #region IItemPaginationInfo implementation
 
        int IItemPaginationInfo.FirstVisibleItemIndex {
            get {
                return this.FirstVisibleItemIndex;
            } 
        }
 
 
        protected int FirstVisibleItemIndex {
            get { 
                return _firstItem;
            }
        }
 

        int IItemPaginationInfo.ItemCount { 
            get { 
                return this.ItemCount;
            } 
        }


        protected int ItemCount { 
            get {
                EnsureDataBound(); 
                return Items != null ? Items.Count : 0; 
            }
        } 


        int IItemPaginationInfo.ItemWeight {
            get { 
                return this.ItemWeight;
            } 
        } 

 
        protected int ItemWeight {
            get {
                return 100;
            } 
        }
 
 
        int IItemPaginationInfo.VisibleItemCount {
            get { 
                return this.VisibleItemCount;
            }
        }
 

        protected int VisibleItemCount { 
            get { 
                if (_itemCount >= 0) {
                    return _itemCount; 
                }
                else {
                    return ItemCount;
                } 
            }
        } 
 

        void IItemPaginationInfo.SetVisibleItems(int firstItem, int itemCount) { 
            SetVisibleItems(firstItem, itemCount);
        }

 
        protected void SetVisibleItems(int firstItem, int itemCount) {
            _firstItem = firstItem; 
            _itemCount = itemCount; 
            if (_firstItem != -1) {
               FirstBulletNumber = _firstItem + 1; 
            }
        }
        #endregion
 

        ///  
        [ 
        Browsable(false),
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public virtual int MaximumWeight {
            get {
                if (Page != null && Page.Form != null) { 
                    return Page.Form.MaximumWeight;
                } 
                return 0; 
            }
        } 
#endif
    }
}

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