Panel.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / Panel.cs / 1305376 / Panel.cs

                            //------------------------------------------------------------------------------
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//  
//-----------------------------------------------------------------------------
 
namespace System.Web.UI.WebControls { 

    using System; 
    using System.ComponentModel;
    using System.Drawing.Design;
    using System.Web;
    using System.Web.UI; 
    using System.Web.Util;
 
    ///  
    ///    Constructs a panel for specifies layout regions
    ///       on a page and defines its properties. 
    /// 
    [
    Designer("System.Web.UI.Design.WebControls.PanelContainerDesigner, " + AssemblyRef.SystemDesign),
    ParseChildren(false), 
    PersistChildren(true),
    ] 
    public class Panel : WebControl { 
        private string _defaultButton;
        private bool _renderedFieldSet = false; 


        /// 
        ///    Initializes a new instance of the  class. 
        /// 
        public Panel() 
            : base(HtmlTextWriterTag.Div) { 
        }
 

        /// 
        ///    Gets or sets the URL of the background image for the panel control.
        ///  
        [
        WebCategory("Appearance"), 
        DefaultValue(""), 
        Editor("System.Web.UI.Design.ImageUrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)),
        UrlProperty(), 
        WebSysDescription(SR.Panel_BackImageUrl)
        ]
        public virtual string BackImageUrl {
            get { 
                if (ControlStyleCreated == false) {
                    return String.Empty; 
                } 
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) { 
                    return panelStyle.BackImageUrl;
                }
                string s = (string)ViewState["BackImageUrl"];
                return((s == null) ? String.Empty : s); 
            }
            set { 
                PanelStyle panelStyle = ControlStyle as PanelStyle; 
                if (panelStyle != null) {
                    panelStyle.BackImageUrl = value; 
                }
                else {
                    ViewState["BackImageUrl"] = value;
                } 
            }
        } 
 

        ///  
        ///     Gets or sets default button for the panel
        /// 
        [
        DefaultValue(""), 
        Themeable(false),
        WebCategory("Behavior"), 
        WebSysDescription(SR.Panel_DefaultButton) 
        ]
        public virtual string DefaultButton { 
            get {
                if (_defaultButton == null) {
                    return String.Empty;
                } 
                return _defaultButton;
            } 
            set { 
                _defaultButton = value;
            } 
        }

        /// 
        /// Gets or sets the direction of text in the panel 
        /// 
        [ 
        DefaultValue(ContentDirection.NotSet), 
        WebCategory("Layout"),
        WebSysDescription(SR.Panel_Direction) 
        ]
        public virtual ContentDirection Direction {
            get {
                if (ControlStyleCreated == false) { 
                    return ContentDirection.NotSet;
                } 
                PanelStyle panelStyle = ControlStyle as PanelStyle; 
                if (panelStyle != null) {
                    return panelStyle.Direction; 
                }
                object direction = ViewState["Direction"];
                return direction == null ? ContentDirection.NotSet : (ContentDirection) direction;
            } 
            set {
                PanelStyle panelStyle = ControlStyle as PanelStyle; 
                if (panelStyle != null) { 
                    panelStyle.Direction = value;
                } 
                else {
                    ViewState["Direction"] = value;
                }
            } 
        }
 
 
        [
        Localizable(true), 
        DefaultValue(""),
        WebCategory("Appearance"),
        WebSysDescription(SR.Panel_GroupingText)
        ] 
        public virtual string GroupingText {
            get { 
                string s = (string)ViewState["GroupingText"]; 
                return (s != null) ? s : String.Empty;
            } 
            set {
                ViewState["GroupingText"] = value;
            }
        } 

 
        ///  
        ///    Gets or sets the horizontal alignment of the contents within the panel.
        ///  
        [
        WebCategory("Layout"),
        DefaultValue(HorizontalAlign.NotSet),
        WebSysDescription(SR.Panel_HorizontalAlign) 
        ]
        public virtual HorizontalAlign HorizontalAlign { 
            get { 
                if (ControlStyleCreated == false) {
                    return HorizontalAlign.NotSet; 
                }
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    return panelStyle.HorizontalAlign; 
                }
                object o = ViewState["HorizontalAlign"]; 
                return ((o == null) ? HorizontalAlign.NotSet : (HorizontalAlign)o); 
            }
            set { 
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    panelStyle.HorizontalAlign = value;
                } 
                else {
                    if (value < HorizontalAlign.NotSet || value > HorizontalAlign.Justify) { 
                        throw new ArgumentOutOfRangeException("value"); 
                    }
                    ViewState["HorizontalAlign"] = value; 
                }
            }
        }
 
        public override bool SupportsDisabledAttribute {
            get { 
                return RenderingCompatibility < VersionUtil.Framework40; 
            }
        } 

        /// 
        /// Gets or sets the scrollbar behavior of the panel.
        ///  
        [
        DefaultValue(ScrollBars.None), 
        WebCategory("Layout"), 
        WebSysDescription(SR.Panel_ScrollBars)
        ] 
        public virtual ScrollBars ScrollBars {
            get {
                if (ControlStyleCreated == false) {
                    return ScrollBars.None; 
                }
                PanelStyle panelStyle = ControlStyle as PanelStyle; 
                if (panelStyle != null) { 
                    return panelStyle.ScrollBars;
                } 
                object scroll = ViewState["ScrollBars"];
                return ((scroll == null) ? ScrollBars.None : (ScrollBars)scroll);
            }
            set { 
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) { 
                    panelStyle.ScrollBars = value; 
                }
                else { 
                    ViewState["ScrollBars"] = value;
                }
            }
        } 

 
        ///  
        ///    Gets or sets a value
        ///       indicating whether the content wraps within the panel. 
        /// 
        [
        WebCategory("Layout"),
        DefaultValue(true), 
        WebSysDescription(SR.Panel_Wrap)
        ] 
        public virtual bool Wrap { 
            get {
                if (ControlStyleCreated == false) { 
                    return true;
                }
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) { 
                    return panelStyle.Wrap;
                } 
                object b = ViewState["Wrap"]; 
                return ((b == null) ? true : (bool)b);
            } 
            set {
                PanelStyle panelStyle = ControlStyle as PanelStyle;
                if (panelStyle != null) {
                    panelStyle.Wrap = value; 
                }
                else { 
                    ViewState["Wrap"] = value; 
                }
            } 
        }


        ///  
        /// 
        ///    Add background-image to list of style attributes to render. 
        ///    Add align and nowrap to list of attributes to render. 
        /// 
        protected override void AddAttributesToRender(HtmlTextWriter writer) { 
            base.AddAttributesToRender(writer);

            string s = BackImageUrl;
            // Whidbey 12856 
            if (s.Trim().Length > 0) {
                writer.AddStyleAttribute(HtmlTextWriterStyle.BackgroundImage, "url(" + ResolveClientUrl(s) + ")"); 
            } 

            AddScrollingAttribute(ScrollBars, writer); 

            HorizontalAlign hAlign = HorizontalAlign;
            if (hAlign != HorizontalAlign.NotSet) {
                TypeConverter hac = TypeDescriptor.GetConverter(typeof(HorizontalAlign)); 
                writer.AddStyleAttribute(HtmlTextWriterStyle.TextAlign, hac.ConvertToInvariantString(hAlign).ToLowerInvariant());
            } 
 
            if (!Wrap) {
                if (EnableLegacyRendering) { 
                    writer.AddAttribute(HtmlTextWriterAttribute.Nowrap, "nowrap", false);
                }
                else {
                    writer.AddStyleAttribute(HtmlTextWriterStyle.WhiteSpace, "nowrap"); 
                }
            } 
 
            if (Direction == ContentDirection.LeftToRight) {
                writer.AddAttribute(HtmlTextWriterAttribute.Dir, "ltr"); 
            }
            else if (Direction == ContentDirection.RightToLeft) {
                writer.AddAttribute(HtmlTextWriterAttribute.Dir, "rtl");
            } 

            if (!DesignMode && 
                (Page != null) && 
                (Page.RequestInternal != null) &&
                (Page.Request.Browser.EcmaScriptVersion.Major > 0) && 
                (Page.Request.Browser.W3CDomVersion.Major > 0)) {
                if (DefaultButton.Length > 0) {
                    Control c = FindControl(DefaultButton);
                    if (c is IButtonControl) { 
                        Page.ClientScript.RegisterDefaultButtonScript(c, writer, true /* UseAddAttribute */);
                    } 
                    else { 
                        throw new InvalidOperationException(SR.GetString(SR.HtmlForm_OnlyIButtonControlCanBeDefaultButton, ID));
                    } 
                }
            }
        }
 
        /// 
        ///    [To be supplied.] 
        ///  
        private void AddScrollingAttribute(ScrollBars scrollBars, HtmlTextWriter writer) {
            switch (scrollBars) { 
                case ScrollBars.Horizontal:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.OverflowX, "scroll");
                    break;
                case ScrollBars.Vertical: 
                    writer.AddStyleAttribute(HtmlTextWriterStyle.OverflowY, "scroll");
                    break; 
                case ScrollBars.Both: 
                    writer.AddStyleAttribute(HtmlTextWriterStyle.Overflow, "scroll");
                    break; 
                case ScrollBars.Auto:
                    writer.AddStyleAttribute(HtmlTextWriterStyle.Overflow, "auto");
                    break;
                default: 
                    break;
            } 
        } 

 
        /// 
        /// 
        ///    A protected method. Creates a panel control style.
        ///  
        protected override Style CreateControlStyle() {
            return new PanelStyle(ViewState); 
        } 

 
        /// 
        public override void RenderBeginTag(HtmlTextWriter writer) {
            AddAttributesToRender(writer);
 
            HtmlTextWriterTag tagKey = TagKey;
            if (tagKey != HtmlTextWriterTag.Unknown) { 
                writer.RenderBeginTag(tagKey); 
            }
            else { 
                writer.RenderBeginTag(TagName);
            }

            string s = GroupingText; 
            bool useGrouping = (s.Length != 0) && !(writer is Html32TextWriter);
            if (useGrouping) { 
                writer.RenderBeginTag(HtmlTextWriterTag.Fieldset); 
                _renderedFieldSet = true;
                writer.RenderBeginTag(HtmlTextWriterTag.Legend); 
                writer.Write(s);
                writer.RenderEndTag();
            }
        } 

        public override void RenderEndTag(HtmlTextWriter writer) { 
            if (_renderedFieldSet) { 
                writer.RenderEndTag();
            } 
            base.RenderEndTag(writer);
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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