SingleSelectRootGridEntry.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / PropertyGridInternal / SingleSelectRootGridEntry.cs / 1305376 / SingleSelectRootGridEntry.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.Windows.Forms.PropertyGridInternal {
    using System.Runtime.InteropServices; 
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
    using System; 
    using System.Collections;
    using System.Reflection; 
    using System.ComponentModel.Design; 
    using System.Windows.Forms;
    using System.Windows.Forms.Design; 
    using System.Drawing;
    using Microsoft.Win32;

 
    internal class SingleSelectRootGridEntry : GridEntry, IRootGridEntry {
        protected object             objValue; 
        protected String             objValueClassName; 
        protected GridEntry          propDefault;
        protected IDesignerHost      host; 
        protected IServiceProvider baseProvider = null;
        protected PropertyTab        tab = null;
        protected PropertyGridView     gridEntryHost    = null;
        protected AttributeCollection  browsableAttributes = null; 
        private   IComponentChangeService changeService;
        protected bool forceReadOnlyChecked; 
 
        //
 
        [
            SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")  // GridEntry classes are internal so we have complete
                                                                                                    // control over who does what in the constructor.
        ] 
        internal SingleSelectRootGridEntry(PropertyGridView gridEntryHost, object value, GridEntry parent, IServiceProvider baseProvider, IDesignerHost host, PropertyTab tab, PropertySort sortType)
        : base(gridEntryHost.OwnerGrid, parent) { 
            Debug.Assert(value != null,"Can't browse a null object!"); 
            this.host = host;
            this.gridEntryHost = gridEntryHost; 
            this.baseProvider = baseProvider;
            this.tab = tab;
            this.objValue = value;
            this.objValueClassName = TypeDescriptor.GetClassName(this.objValue); 

            this.IsExpandable = true; 
            // default to categories 
            this.PropertySort = sortType;
            this.InternalExpanded = true; 
        }

        [
            SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")  // GridEntry classes are internal so we have complete 
                                                                                                    // control over who does what in the constructor.
        ] 
        internal SingleSelectRootGridEntry(PropertyGridView view, object value, IServiceProvider baseProvider, IDesignerHost host, PropertyTab tab, PropertySort sortType) : this(view, value,null, baseProvider, host, tab, sortType) { 
        }
 
        /// 
        /// 
        /// The set of attributes that will be used for browse filtering
        ///  
        public override AttributeCollection BrowsableAttributes {
            get { 
                if (browsableAttributes == null) { 
                    browsableAttributes = new AttributeCollection(new Attribute[]{BrowsableAttribute.Yes});
                } 
                return this.browsableAttributes;
            }
            set {
                if (value == null) { 
                    ResetBrowsableAttributes();
                    return; 
                } 

                bool same = true; 

                if (this.browsableAttributes != null && value != null && this.browsableAttributes.Count == value.Count) {
                    Attribute[] attr1 = new Attribute[browsableAttributes.Count];
                    Attribute[] attr2 = new Attribute[value.Count]; 

                    browsableAttributes.CopyTo(attr1, 0); 
                    value.CopyTo(attr2, 0); 

                    Array.Sort(attr1, GridEntry.AttributeTypeSorter); 
                    Array.Sort(attr2, GridEntry.AttributeTypeSorter);
                    for (int i = 0; i < attr1.Length; i++) {
                        if (!attr1[i].Equals(attr2[i])) {
                            same = false; 
                            break;
                        } 
                    } 
                }
                else { 
                    same = false;
                }

                this.browsableAttributes = value; 

                if (!same && Children != null && Children.Count > 0) { 
                    DisposeChildren(); 
                }
            } 
        }

        protected override IComponentChangeService ComponentChangeService {
            get { 
               if (changeService == null) {
                    changeService = (IComponentChangeService)GetService(typeof(IComponentChangeService)); 
               } 
               return changeService;
            } 
        }

        internal override bool AlwaysAllowExpand {
            get { 
               return true;
            } 
        } 

        public override PropertyTab CurrentTab { 
            get {
                return tab;
            }
            set { 
                this.tab = value;
            } 
        } 

        internal override GridEntry DefaultChild { 
            get {
                return propDefault;
            }
            set { 
                this.propDefault = value;
            } 
        } 

        internal override IDesignerHost DesignerHost { 
            get {
                return host;
            }
            set { 
                host = value;
            } 
        } 

        internal override bool ForceReadOnly { 
            get {
                if (!forceReadOnlyChecked) {
                    ReadOnlyAttribute readOnlyAttr = (ReadOnlyAttribute)TypeDescriptor.GetAttributes(this.objValue)[typeof(ReadOnlyAttribute)];
                    if ((readOnlyAttr != null && !readOnlyAttr.IsDefaultAttribute()) || TypeDescriptor.GetAttributes(this.objValue).Contains(InheritanceAttribute.InheritedReadOnly)) { 
                        flags |= FLAG_FORCE_READONLY;
                    } 
                    forceReadOnlyChecked = true; 
                }
                return base.ForceReadOnly || (GridEntryHost != null && !GridEntryHost.Enabled); 
            }
        }

        internal override PropertyGridView GridEntryHost { 
            get {
                return this.gridEntryHost; 
            } 
            set {
                this.gridEntryHost = value; 
            }
        }

        public override GridItemType GridItemType { 
            get {
                return GridItemType.Root; 
            } 
        }
 
        /// 
        /// 
        ///     Retrieves the keyword that the VS help dynamic help window will
        ///     use when this IPE is selected. 
        /// 
        public override string HelpKeyword { 
            get { 

               HelpKeywordAttribute helpAttribute = (HelpKeywordAttribute)TypeDescriptor.GetAttributes(objValue)[typeof(HelpKeywordAttribute)]; 

               if (helpAttribute != null && !helpAttribute.IsDefaultAttribute()) {
                    return helpAttribute.HelpKeyword;
               } 

               return this.objValueClassName; 
            } 
        }
 
        public override string PropertyLabel {
            get {
                if (objValue is IComponent) {
                    ISite site = ((IComponent)objValue).Site; 
                    if (site == null) {
                        return objValue.GetType().Name; 
                    } 
                    else {
                        return site.Name; 
                    }
                }
                else if (objValue != null) {
                    return objValue.ToString(); 
                }
                return null; 
            } 
        }
 
        /// 
        /// 
        /// Gets or sets the value for the property that is represented
        /// by this GridEntry. 
        /// 
        public override object PropertyValue{ 
            get { 
                return objValue;
            } 
            set {
                object old = objValue;
                objValue = value;
                objValueClassName = TypeDescriptor.GetClassName(objValue); 
                ownerGrid.ReplaceSelectedObject(old, value);
            } 
        } 

        protected override bool CreateChildren() { 
            bool fReturn = base.CreateChildren();
            CategorizePropEntries();
            return fReturn;
        } 

        protected override void Dispose(bool disposing) { 
            if (disposing) { 
                host = null;
                baseProvider = null; 
                tab = null;
                gridEntryHost = null;
                changeService = null;
            } 
            this.objValue = null;
            this.objValueClassName = null; 
            this.propDefault = null; 
            base.Dispose(disposing);
        } 

        public override object GetService(Type serviceType) {
            object service = null;
 
            if (host != null) {
                service = host.GetService(serviceType); 
            } 
            if (service == null && baseProvider != null) {
                service = baseProvider.GetService(serviceType); 
            }
            return service;
        }
 
        /// 
        ///  
        /// Reset the Browsable attributes to the default (BrowsableAttribute.Yes) 
        /// 
        public void ResetBrowsableAttributes() { 
            this.browsableAttributes = new AttributeCollection(new Attribute[]{BrowsableAttribute.Yes});
        }

 
        /// 
        ///  
        /// Sets the value of this GridEntry from text 
        /// 
        public virtual void ShowCategories(bool fCategories) { 
            if (((this.PropertySort &= PropertySort.Categorized) !=0) != fCategories) {

                if (fCategories) {
                  this.PropertySort |= PropertySort.Categorized; 
                }
                else { 
                  this.PropertySort &= ~PropertySort.Categorized; 
                }
 

                // recreate the children
                if (this.Expandable && this.ChildCollection != null) {
                    CreateChildren(); 
                }
            } 
        } 

        internal void CategorizePropEntries() { 
            if (Children.Count > 0) {

                GridEntry[] childEntries = new GridEntry[this.Children.Count];
                this.Children.CopyTo(childEntries, 0); 

                if ((this.PropertySort & PropertySort.Categorized) != 0) { 
 

                    // first, walk through all the entires and 
                    // group them by their category by adding
                    // them to a hashtable of arraylists.
                    //
                    Hashtable bins = new Hashtable(); 
                    for (int i = 0; i < childEntries.Length; i++) {
                        GridEntry pe = childEntries[i]; 
 						Debug.Assert(pe != null); 
						if (pe != null) {
							string category = pe.PropertyCategory; 
							ArrayList bin = (ArrayList)bins[category];
 							if (bin == null) {
								bin = new ArrayList();
 								bins[category] = bin; 
 							}
							bin.Add(pe); 
 						} 
                    }
 
                    // now walk through the hashtable
                    // and create a categorygridentry for each
                    // category that holds all the properties
                    // of that category. 
                    //
                    ArrayList propList = new ArrayList(); 
                    IDictionaryEnumerator enumBins = (IDictionaryEnumerator)bins.GetEnumerator(); 
                    while (enumBins.MoveNext()) {
                        ArrayList bin = (ArrayList)enumBins.Value; 
                        if (bin != null) {
                            string category = (string)enumBins.Key;
                            if (bin.Count > 0) {
                                GridEntry[] rgpes = new GridEntry[bin.Count]; 
                                bin.CopyTo(rgpes, 0);
                                try { 
                                    propList.Add(new CategoryGridEntry(this.ownerGrid, this, category, rgpes)); 
                                }
                                catch { 
                                }
                            }
                        }
                    } 

                    childEntries = new GridEntry[propList.Count]; 
                    propList.CopyTo(childEntries, 0); 
                    StringSorter.Sort(childEntries);
 
                    ChildCollection.Clear();
                    ChildCollection.AddRange(childEntries);
              }
           } 
        }
       } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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SingleSelectRootGridEntry.cs source code in C# .NET

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