EditorPartChrome.cs source code in C# .NET

                        
Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / EditorPartChrome.cs / 1 / EditorPartChrome.cs
                        

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

namespace System.Web.UI.WebControls.WebParts { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Drawing;
    using System.Globalization;
    using System.Security.Permissions; 
    using System.Web.Handlers;
    using System.Web.UI; 
    using System.Web.UI.WebControls; 

    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public class EditorPartChrome {

        private EditorZoneBase _zone; 

        // PERF: Cache these, since they are needed for every EditorPart in the zone 
        private Style _chromeStyleNoBorder; 
        private Style _titleTextStyle;
 
        public EditorPartChrome(EditorZoneBase zone) {
            if (zone == null) {
                throw new ArgumentNullException("zone");
            } 
            _zone = zone;
        } 
 
        protected EditorZoneBase Zone {
            get { 
                return _zone;
            }
        }
 
        protected virtual Style CreateEditorPartChromeStyle(EditorPart editorPart, PartChromeType chromeType) {
            if (editorPart == null) { 
                throw new ArgumentNullException("editorPart"); 
            }
            if ((chromeType < PartChromeType.Default) || (chromeType > PartChromeType.BorderOnly)) { 
                throw new ArgumentOutOfRangeException("chromeType");
            }

            // PERF: Cache these, since they are needed for every EditorPart in the zone. 
            if (chromeType == PartChromeType.BorderOnly || chromeType == PartChromeType.TitleAndBorder) {
                // We don't want to set any border styles for ChromeType of TitleAndBorder or BorderOnly, 
                // since the FrameSet has a default border, and it will use XP themes as long as no border styles 
                // are set.
                // PERF: Just return the Zone.PartChromeStyle directly without making a copy 
                return Zone.PartChromeStyle;
            }
            else {
                if (_chromeStyleNoBorder == null) { 
                    Style style = new Style();
 
                    // create copy of PartChromeStyle so we can modify it 
                    style.CopyFrom(Zone.PartChromeStyle);
 
                    if (style.BorderStyle != BorderStyle.None) {
                        style.BorderStyle = BorderStyle.None;
                    }
                    if (style.BorderWidth != Unit.Empty) { 
                        style.BorderWidth = Unit.Empty;
                    } 
                    if (style.BorderColor != Color.Empty) { 
                        style.BorderColor = Color.Empty;
                    } 

                    _chromeStyleNoBorder = style;
                }
                return _chromeStyleNoBorder; 
            }
        } 
 
        public virtual void PerformPreRender() {
        } 

        public virtual void RenderEditorPart(HtmlTextWriter writer, EditorPart editorPart) {
            if (editorPart == null) {
                throw new ArgumentNullException("editorPart"); 
            }
 
            PartChromeType chromeType = Zone.GetEffectiveChromeType(editorPart); 
            Style partChromeStyle = CreateEditorPartChromeStyle(editorPart, chromeType);
 
            // Apply ChromeStyle to the Fieldset
            if (!partChromeStyle.IsEmpty) {
                partChromeStyle.AddAttributesToRender(writer, Zone);
            } 

            writer.RenderBeginTag(HtmlTextWriterTag.Fieldset); 
 
            // Use ChromeType to determine whether to render the legend
            if (chromeType == PartChromeType.TitleAndBorder || chromeType == PartChromeType.TitleOnly) { 
                RenderTitle(writer, editorPart);
            }

            if (editorPart.ChromeState != PartChromeState.Minimized) { 
                // Apply PartStyle to a 
 around the part rendering
                Style partStyle = Zone.PartStyle; 
                if (!partStyle.IsEmpty) { 
                    partStyle.AddAttributesToRender(writer, Zone);
                } 

                // We want to have 5 pixels of spacing aroung the EditorPart contents.  There are
                // 3 ways to accomplish this:
                // 1. 
 - This is bad because it adds 5px of space above 
                //    the legend.  It also makes the fieldset too wide.
                // 2. 
 - This is bad because the PartStyle-BackColor 
                //    will now span the whole width of the legend.  For consistency with WebPartChrome, 
                //    we want the PartChromeStyle-BackColor to show in the 5px of space around the contents.
                // 3. 
 - This is the best option. 
                //
                // For now, I don't think we should render a margin here.  People writing custom
                // EditorParts can add a margin to their contents if they want it.  This is not the
                // same as the WebPartChrome case, since for WebParts we allow people to use ServerControls, 
                // that will likely not have a margin.  (VSWhidbey 324397)
                // writer.AddStyleAttribute(HtmlTextWriterStyle.Margin, "5px"); 
 
                writer.RenderBeginTag(HtmlTextWriterTag.Div);
                RenderPartContents(writer, editorPart); 
                writer.RenderEndTag();  // Div
            }

            writer.RenderEndTag();  // Fieldset 
        }
 
        protected virtual void RenderPartContents(HtmlTextWriter writer, EditorPart editorPart) { 
            // The AccessKey is rendered by the chrome on the 
 tag, so we don't want
            // the EditorPart to render it on its own tags. 
            string accessKey = editorPart.AccessKey;
            if (!String.IsNullOrEmpty(accessKey)) {
                editorPart.AccessKey = String.Empty;
            } 
            editorPart.RenderControl(writer);
            if (!String.IsNullOrEmpty(accessKey)) { 
                editorPart.AccessKey = accessKey; 
            }
        } 

        private void RenderTitle(HtmlTextWriter writer, EditorPart editorPart) {
            string displayTitle = editorPart.DisplayTitle;
 
            if (String.IsNullOrEmpty(displayTitle)) {
                return; 
            } 

            // Apply TitleStyle to the Legend 
            TableItemStyle titleTableItemStyle = Zone.PartTitleStyle;

            // PERF: Cache this, since it is needed for every EditorPart in the zone
            if (_titleTextStyle == null) { 
                // Need to copy the TableItemStyle to a plain Style, since we are going to apply it to
                // the 
 tag, which is not a table item.  We ignore the horizontal align, 
                // vertical align, and nowrap properties. 
                Style style = new Style();
                style.CopyFrom(titleTableItemStyle); 
                _titleTextStyle = style;
            }

            if (!_titleTextStyle.IsEmpty) { 
                _titleTextStyle.AddAttributesToRender(writer, Zone);
            } 
 
            string description = editorPart.Description;
            if (!String.IsNullOrEmpty(description)) { 
                writer.AddAttribute(HtmlTextWriterAttribute.Title, description);
            }

            string accessKey = editorPart.AccessKey; 
            if (!String.IsNullOrEmpty(accessKey)) {
                writer.AddAttribute(HtmlTextWriterAttribute.Accesskey, accessKey); 
            } 

            writer.RenderBeginTag(HtmlTextWriterTag.Legend); 
            writer.Write(displayTitle);
            writer.RenderEndTag();  // Legend
        }
    } 
}


                        

                        

                        
                        

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