CategoryGridEntry.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 / CategoryGridEntry.cs / 1305376 / CategoryGridEntry.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

//#define PAINT_CATEGORY_TRIANGLE 
/* 
 */
namespace System.Windows.Forms.PropertyGridInternal { 

    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;
 
     using System;
     using System.Collections; 
     using System.Reflection; 

     using System.ComponentModel; 
     using System.ComponentModel.Design;
     using System.Windows.Forms;
     using System.Drawing;
     using Microsoft.Win32; 

     internal class CategoryGridEntry : GridEntry { 
 
        internal string name;
        private Brush backBrush = null; 
        private static Hashtable categoryStates = null;

        [
            SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")  // GridEntry classes are internal so we have complete 
                                                                                                    // control over who does what in the constructor.
        ] 
        public CategoryGridEntry(PropertyGrid ownerGrid, GridEntry peParent,string name, GridEntry[] childGridEntries) 
        : base(ownerGrid, peParent) {
            this.name = name; 

#if DEBUG
            for (int n = 0;n < childGridEntries.Length; n++) {
                Debug.Assert(childGridEntries[n] != null, "Null item in category subproperty list"); 
            }
#endif 
            if (categoryStates == null) { 
                categoryStates = new Hashtable();
            } 

            lock (categoryStates) {
                if (!categoryStates.ContainsKey(name)) {
                    categoryStates.Add(name, true); 
                }
            } 
 
            this.IsExpandable = true;
 
            for (int i = 0; i < childGridEntries.Length; i++) {
                childGridEntries[i].ParentGridEntry = this;
            }
 
            this.ChildCollection = new GridEntryCollection(this, childGridEntries);
 
            lock (categoryStates) { 
                this.InternalExpanded = (bool)categoryStates[name];
            } 

            this.SetFlag(GridEntry.FLAG_LABEL_BOLD,true);
        }
 

        ///  
        ///  
        /// Returns true if this GridEntry has a value field in the right hand column.
        ///  
        internal override bool HasValue {
            get {
               return false;
            } 
        }
 
        protected override void Dispose(bool disposing) { 
            if (disposing) {
                if (backBrush != null) { 
                    backBrush.Dispose();
                    backBrush = null;
                }
 
                if (ChildCollection != null) {
                    ChildCollection = null; 
                } 
            }
            base.Dispose(disposing); 
        }

        public override void DisposeChildren() {
 
            // categories should never dispose
            // 
            return; 
        }
 

        // we don't want this guy participating in property depth.
        public override int PropertyDepth {
            get { 
                return base.PropertyDepth - 1;
            } 
        } 

        protected override Brush GetBackgroundBrush(Graphics g) { 
            return this.GridEntryHost.GetLineBrush(g);
        }

        protected override Color LabelTextColor { 
            get {
                return ownerGrid.CategoryForeColor; 
            } 
        }
 
        public override bool Expandable {
            get {
                return !GetFlagSet(FL_EXPANDABLE_FAILED);
            } 
        }
 
        internal override bool InternalExpanded { 
            set {
                base.InternalExpanded = value; 
                lock (categoryStates) {
                    categoryStates[this.name] = value;
                }
            } 
        }
 
        public override GridItemType GridItemType { 
            get {
                return GridItemType.Category; 
            }
        }
        public override string HelpKeyword {
            get { 
               return null;
            } 
        } 

        public override string PropertyLabel { 
            get {
                return name;
            }
        } 

        internal override int PropertyLabelIndent { 
            get { 
                // we give an extra pixel for breathing room
                // we want to make sure that we return 0 for property depth here instead of 
                PropertyGridView gridHost = this.GridEntryHost;

                // we call base.PropertyDepth here because we don't want the subratction to happen.
                return 1+gridHost.GetOutlineIconSize()+OUTLINE_ICON_PADDING + (base.PropertyDepth * gridHost.GetDefaultOutlineIndent()); 
            }
        } 
 
        public override string GetPropertyTextValue(object o) {
            return ""; 
        }

        public override Type PropertyType {
            get { 
                return typeof(void);
            } 
        } 

        ///  
        /// 
        /// Gets the owner of the current value.  This is usually the value of the
        /// root entry, which is the object being browsed
        ///  
        public override object GetChildValueOwner(GridEntry childEntry) {
            return ParentGridEntry.GetChildValueOwner(childEntry); 
        } 

        protected override bool CreateChildren(bool diffOldChildren) { 
            return true;
        }

        public override string GetTestingInfo() { 
            string str = "object = (";
            str += FullLabel; 
            str += "), Category = (" + this.PropertyLabel + ")"; 
            return str;
        } 

        public override void PaintLabel(System.Drawing.Graphics g, Rectangle rect, Rectangle clipRect, bool selected, bool paintFullLabel) {

            base.PaintLabel(g, rect, clipRect, false, true); 

            // now draw the focus rect 
            if (selected && hasFocus) { 
                bool bold = ((this.Flags & GridEntry.FLAG_LABEL_BOLD) != 0);
                Font font = GetFont(bold); 
                int labelWidth = GetLabelTextWidth(this.PropertyLabel, g, font);

                int indent = PropertyLabelIndent-2;
                Rectangle focusRect = new Rectangle(indent, rect.Y, labelWidth+3, rect.Height-1); 
                ControlPaint.DrawFocusRectangle(g, focusRect);
            } 
 
            // draw the line along the top
            if (parentPE.GetChildIndex(this) > 0) { 
                g.DrawLine(SystemPens.Control, rect.X-1, rect.Y-1, rect.Width+2, rect.Y - 1);
            }
        }
 
        public override void PaintValue(object val, System.Drawing.Graphics g, Rectangle rect, Rectangle clipRect, PaintValueFlags paintFlags) {
            base.PaintValue(val, g, rect, clipRect, paintFlags & ~PaintValueFlags.DrawSelected); 
 
            // draw the line along the top
            if (parentPE.GetChildIndex(this) > 0) { 
                g.DrawLine(SystemPens.Control, rect.X-2, rect.Y-1,rect.Width+1, rect.Y-1);
            }
        }
 
        internal override bool NotifyChildValue(GridEntry pe, int type) {
            return parentPE.NotifyChildValue(pe, type); 
        } 
    }
 
}

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

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