DataGridViewHeaderCell.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridViewHeaderCell.cs / 1 / DataGridViewHeaderCell.cs

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

namespace System.Windows.Forms 
{ 
    using System;
    using System.Diagnostics; 
    using System.ComponentModel;
    using System.Drawing;
    using System.Windows.Forms.VisualStyles;
    using System.Diagnostics.CodeAnalysis; 
    using System.Globalization;
 
    ///  
    /// 
    ///    Identifies a cell in the dataGridView. 
    /// 
    ///
    public class DataGridViewHeaderCell : DataGridViewCell
    { 
        private const byte DATAGRIDVIEWHEADERCELL_themeMargin = 100;  // used to calculate the margins required for XP theming rendering
 
        private static Type defaultFormattedValueType = typeof(System.String); 
        private static Type defaultValueType = typeof(System.Object);
        private static Type cellType = typeof(DataGridViewHeaderCell); 
        private static Rectangle rectThemeMargins = new Rectangle(-1, -1, 0, 0);
        private static readonly int PropValueType = PropertyStore.CreateKey();
        private static readonly int PropButtonState = PropertyStore.CreateKey();
        private static readonly int PropFlipXPThemesBitmap = PropertyStore.CreateKey(); 
        private const string AEROTHEMEFILENAME = "Aero.msstyles";
 
        ///  
        public DataGridViewHeaderCell()
        { 
        }

        /// 
        protected ButtonState ButtonState 
        {
            get 
            { 
                bool found;
                int buttonState = this.Properties.GetInteger(PropButtonState, out found); 
                if (found)
                {
                    return (ButtonState) buttonState;
                } 
                return ButtonState.Normal;
            } 
        } 

        private ButtonState ButtonStatePrivate 
        {
            [
                SuppressMessage("Microsoft.Performance", "CA1803:AvoidCostlyCallsWherePossible") // Enum.IsDefined is OK here. Only specific flag combinations are allowed, and it's debug only anyways.
            ] 
            set
            { 
                Debug.Assert(Enum.IsDefined(typeof(ButtonState), value)); 
                if (this.ButtonState != value)
                { 
                    this.Properties.SetInteger(PropButtonState, (int) value);
                }
            }
        } 

        protected override void Dispose(bool disposing) { 
             if (FlipXPThemesBitmap != null && disposing) { 
                  FlipXPThemesBitmap.Dispose();
             } 
             base.Dispose(disposing);

        }
 
        /// 
        [ 
            Browsable(false) 
        ]
        public override bool Displayed 
        {
            get
            {
                if (this.DataGridView == null || !this.DataGridView.Visible) 
                {
                    // No detached or invisible element is displayed. 
                    return false; 
                }
 
                if (this.OwningRow != null)
                {
                    // row header cell
                    return this.DataGridView.RowHeadersVisible && this.OwningRow.Displayed; 
                }
 
                if (this.OwningColumn != null) 
                {
                    // column header cell 
                    return this.DataGridView.ColumnHeadersVisible && this.OwningColumn.Displayed;
                }

                // top left header cell 
                Debug.Assert(!this.DataGridView.LayoutInfo.dirty);
                return this.DataGridView.LayoutInfo.TopLeftHeader != Rectangle.Empty; 
            } 
        }
 
        internal Bitmap FlipXPThemesBitmap
        {
            get
            { 
                return (Bitmap)this.Properties.GetObject(PropFlipXPThemesBitmap);
            } 
            set 
            {
                if (value != null || this.Properties.ContainsObject(PropFlipXPThemesBitmap)) 
                {
                    this.Properties.SetObject(PropFlipXPThemesBitmap, value);
                }
            } 
        }
 
        ///  
        public override Type FormattedValueType
        { 
            get
            {
                return defaultFormattedValueType;
            } 
        }
 
        ///  
        [
            Browsable(false) 
        ]
        public override bool Frozen
        {
            get 
            {
                if (this.OwningRow != null) 
                { 
                    // row header cell
                    return this.OwningRow.Frozen; 
                }

                if (this.OwningColumn != null)
                { 
                    // column header cell
                    return this.OwningColumn.Frozen; 
                } 

                if (this.DataGridView != null) 
                {
                    // top left header cell
                    return true;
                } 

                // detached header cell 
                return false; 
            }
        } 

        internal override bool HasValueType
        {
            get 
            {
                return this.Properties.ContainsObject(PropValueType) && this.Properties.GetObject(PropValueType) != null; 
            } 
        }
 
        /// 
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public override bool ReadOnly 
        { 
            get
            { 
                return true;
            }
            set
            { 
                throw new InvalidOperationException(SR.GetString(SR.DataGridView_HeaderCellReadOnlyProperty, "ReadOnly"));
            } 
        } 

        ///  
        [
            Browsable(false)
        ]
        public override bool Resizable 
        {
            get 
            { 
                if (this.OwningRow != null)
                { 
                    // must be a row header cell
                    return (this.OwningRow.Resizable == DataGridViewTriState.True) || (this.DataGridView != null && this.DataGridView.RowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing);
                }
 
                if (this.OwningColumn != null)
                { 
                    // must be a column header cell 
                    return (this.OwningColumn.Resizable == DataGridViewTriState.True) ||
                           (this.DataGridView != null && this.DataGridView.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.EnableResizing); 
                }

                // must be the top left header cell
                return this.DataGridView != null && (this.DataGridView.RowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing || this.DataGridView.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.EnableResizing); 
            }
        } 
 
        /// 
        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ]
        public override bool Selected 
        {
            get 
            { 
                return false;
            } 
            set
            {
                throw new InvalidOperationException(SR.GetString(SR.DataGridView_HeaderCellReadOnlyProperty, "Selected"));
            } 
        }
 
        ///  
        public override Type ValueType
        { 
            get
            {
                Type valueType = (Type) this.Properties.GetObject(PropValueType);
                if (valueType != null) 
                {
                    return valueType; 
                } 
                return defaultValueType;
            } 
            set
            {
                if (value != null || this.Properties.ContainsObject(PropValueType))
                { 
                    this.Properties.SetObject(PropValueType, value);
                } 
            } 
        }
 
        /// 
        [
            Browsable(false)
        ] 
        public override bool Visible
        { 
            get 
            {
                if (this.OwningRow != null) 
                {
                    // row header cell
                    return this.OwningRow.Visible &&
                            (this.DataGridView == null || this.DataGridView.RowHeadersVisible); 
                }
 
                if (this.OwningColumn != null) 
                {
                    // column header cell 
                    return this.OwningColumn.Visible &&
                            (this.DataGridView == null || this.DataGridView.ColumnHeadersVisible);
                }
 
                if (this.DataGridView != null)
                { 
                    // top left header cell 
                    return this.DataGridView.RowHeadersVisible && this.DataGridView.ColumnHeadersVisible;
                } 

                return false;
            }
        } 

        ///  
        public override object Clone() 
        {
            DataGridViewHeaderCell dataGridViewCell; 
            Type thisType = this.GetType();
            if (thisType == cellType) //performance improvement
            {
                dataGridViewCell = new DataGridViewHeaderCell(); 
            }
            else 
            { 
                // SECREVIEW : Late-binding does not represent a security thread, see bug#411899 for more info..
                // 
                dataGridViewCell = (DataGridViewHeaderCell)System.Activator.CreateInstance(thisType);
            }
            base.CloneInternal(dataGridViewCell);
            dataGridViewCell.Value = this.Value; 
            return dataGridViewCell;
        } 
 
        /// 
        public override ContextMenuStrip GetInheritedContextMenuStrip(int rowIndex) 
        {
            ContextMenuStrip contextMenuStrip = GetContextMenuStrip(rowIndex);
            if (contextMenuStrip != null)
            { 
                return contextMenuStrip;
            } 
 
            if (this.DataGridView != null)
            { 
                return this.DataGridView.ContextMenuStrip;
            }
            else
            { 
                return null;
            } 
        } 

        ///  
        public override DataGridViewElementStates GetInheritedState(int rowIndex)
        {
            DataGridViewElementStates state = DataGridViewElementStates.ResizableSet | DataGridViewElementStates.ReadOnly;
 
            if (this.OwningRow != null)
            { 
                // row header cell 
                if ((this.DataGridView == null && rowIndex != -1) ||
                    (this.DataGridView != null && (rowIndex < 0 || rowIndex >= this.DataGridView.Rows.Count))) 
                {
                    throw new ArgumentException(SR.GetString(SR.InvalidArgument, "rowIndex", rowIndex.ToString(CultureInfo.CurrentCulture)));
                }
                if (this.DataGridView != null && this.DataGridView.Rows.SharedRow(rowIndex) != this.OwningRow) 
                {
                    throw new ArgumentException(SR.GetString(SR.InvalidArgument, "rowIndex", rowIndex.ToString(CultureInfo.CurrentCulture))); 
                } 
                state |= (this.OwningRow.GetState(rowIndex) & DataGridViewElementStates.Frozen);
                if (this.OwningRow.GetResizable(rowIndex) == DataGridViewTriState.True || (this.DataGridView != null && this.DataGridView.RowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing)) 
                {
                    state |= DataGridViewElementStates.Resizable;
                }
                if (this.OwningRow.GetVisible(rowIndex) && (this.DataGridView == null || this.DataGridView.RowHeadersVisible)) 
                {
                    state |= DataGridViewElementStates.Visible; 
                    if (this.OwningRow.GetDisplayed(rowIndex)) 
                    {
                        state |= DataGridViewElementStates.Displayed; 
                    }
                }
            }
            else if (this.OwningColumn != null) 
            {
                // column header cell 
                if (rowIndex != -1) 
                {
                    throw new ArgumentOutOfRangeException("rowIndex"); 
                }
                state |= (this.OwningColumn.State & DataGridViewElementStates.Frozen);
                if (this.OwningColumn.Resizable == DataGridViewTriState.True ||
                    (this.DataGridView != null && this.DataGridView.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.EnableResizing)) 
                {
                    state |= DataGridViewElementStates.Resizable; 
                } 
                if (this.OwningColumn.Visible && (this.DataGridView == null || this.DataGridView.ColumnHeadersVisible))
                { 
                    state |= DataGridViewElementStates.Visible;
                    if (this.OwningColumn.Displayed)
                    {
                        state |= DataGridViewElementStates.Displayed; 
                    }
                } 
            } 
            else if (this.DataGridView != null)
            { 
                // top left header cell
                if (rowIndex != -1)
                {
                    throw new ArgumentOutOfRangeException("rowIndex"); 
                }
                state |= DataGridViewElementStates.Frozen; 
                if (this.DataGridView.RowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing || this.DataGridView.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.EnableResizing) 
                {
                    state |= DataGridViewElementStates.Resizable; 
                }
                if (this.DataGridView.RowHeadersVisible && this.DataGridView.ColumnHeadersVisible)
                {
                    state |= DataGridViewElementStates.Visible; 
                    if (this.DataGridView.LayoutInfo.TopLeftHeader != Rectangle.Empty)
                    { 
                        state |= DataGridViewElementStates.Displayed; 
                    }
                } 
            }

#if DEBUG
            if (this.OwningRow == null || this.OwningRow.Index != -1) 
            {
                DataGridViewElementStates stateDebug = DataGridViewElementStates.ResizableSet; 
                if (this.Displayed) 
                {
                    stateDebug |= DataGridViewElementStates.Displayed; 
                }
                if (this.Frozen)
                {
                    stateDebug |= DataGridViewElementStates.Frozen; 
                }
                if (this.ReadOnly) 
                { 
                    stateDebug |= DataGridViewElementStates.ReadOnly;
                } 
                if (this.Resizable)
                {
                    stateDebug |= DataGridViewElementStates.Resizable;
                } 
                if (this.Selected)
                { 
                    stateDebug |= DataGridViewElementStates.Selected; 
                }
                if (this.Visible) 
                {
                    stateDebug |= DataGridViewElementStates.Visible;
                }
                Debug.Assert(state == stateDebug); 
            }
#endif 
 
            return state;
        } 

        /// 
        protected override Size GetSize(int rowIndex)
        { 
            if (this.DataGridView == null)
            { 
                // detached cell 
                if (rowIndex != -1)
                { 
                    throw new ArgumentOutOfRangeException("rowIndex");
                }
                return new Size(-1, -1);
            } 
            if (this.OwningColumn != null)
            { 
                // must be a column header cell 
                if (rowIndex != -1)
                { 
                    throw new ArgumentOutOfRangeException("rowIndex");
                }
                return new Size(this.OwningColumn.Thickness, this.DataGridView.ColumnHeadersHeight);
            } 
            else if (this.OwningRow != null)
            { 
                // must be a row header cell 
                if (rowIndex < 0 || rowIndex >= this.DataGridView.Rows.Count)
                { 
                    throw new ArgumentOutOfRangeException("rowIndex");
                }
                if (this.DataGridView.Rows.SharedRow(rowIndex) != this.OwningRow)
                { 
                    throw new ArgumentException(SR.GetString(SR.InvalidArgument, "rowIndex", rowIndex.ToString(CultureInfo.CurrentCulture)));
                } 
                return new Size(this.DataGridView.RowHeadersWidth, this.OwningRow.GetHeight(rowIndex)); 
            }
            else 
            {
                // must be the top left header cell
                if (rowIndex != -1)
                { 
                    throw new ArgumentOutOfRangeException("rowIndex");
                } 
                return new Size(this.DataGridView.RowHeadersWidth, this.DataGridView.ColumnHeadersHeight); 
            }
        } 

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
        internal static Rectangle GetThemeMargins(Graphics g)
        { 
            if (rectThemeMargins.X == -1)
            { 
                Rectangle rectCell = new Rectangle(0, 0, DATAGRIDVIEWHEADERCELL_themeMargin, DATAGRIDVIEWHEADERCELL_themeMargin); 
                Rectangle rectContent = DataGridViewHeaderCellRenderer.VisualStyleRenderer.GetBackgroundContentRectangle(g, rectCell);
                rectThemeMargins.X = rectContent.X; 
                rectThemeMargins.Y = rectContent.Y;
                rectThemeMargins.Width = DATAGRIDVIEWHEADERCELL_themeMargin - rectContent.Right;
                rectThemeMargins.Height = DATAGRIDVIEWHEADERCELL_themeMargin - rectContent.Bottom;
                // On WinXP, the theming margins for a header are unexpectedly (3, 0, 0, 0) when you'd expect something like (0, 0, 2, 3) 
                if (rectThemeMargins.X == 3 &&
                    rectThemeMargins.Y + rectThemeMargins.Width + rectThemeMargins.Height == 0) 
                { 
                    rectThemeMargins = new Rectangle(0, 0, 2, 3);
                } 
                else
                {
                    // On Vista, the theming margins for a header are unexpectedly (0, 0, 0, 0) when you'd expect something like (2, 1, 0, 2)
                    // Padding themePadding = DataGridViewHeaderCellRenderer.VisualStyleRenderer.GetMargins(g, MarginProperty.ContentMargins); /* or MarginProperty.SizingMargins */ 
                    // does not work either at this time. It AVs -So we hard code the margins for now.
                    try 
                    { 
                        string themeFilename = System.IO.Path.GetFileName(System.Windows.Forms.VisualStyles.VisualStyleInformation.ThemeFilename);
                        if (String.Equals(themeFilename, AEROTHEMEFILENAME, StringComparison.OrdinalIgnoreCase)) 
                        {
                            rectThemeMargins = new Rectangle(2, 1, 0, 2);
                        }
                    } 
                    catch
                    { 
                    } 
                }
            } 
            return rectThemeMargins;
        }

        ///  
        protected override object GetValue(int rowIndex)
        { 
            if (rowIndex != -1) 
            {
                throw new ArgumentOutOfRangeException("rowIndex"); 
            }
            return this.Properties.GetObject(PropCellValue);
        }
 
        /// 
        protected override bool MouseDownUnsharesRow(DataGridViewCellMouseEventArgs e) 
        { 
            return e.Button == MouseButtons.Left && this.DataGridView.ApplyVisualStylesToHeaderCells;
        } 

        /// 
        protected override bool MouseEnterUnsharesRow(int rowIndex)
        { 
            return this.ColumnIndex == this.DataGridView.MouseDownCellAddress.X &&
                   rowIndex == this.DataGridView.MouseDownCellAddress.Y && 
                   this.DataGridView.ApplyVisualStylesToHeaderCells; 
        }
 
        /// 
        protected override bool MouseLeaveUnsharesRow(int rowIndex)
        {
            return this.ButtonState != ButtonState.Normal && this.DataGridView.ApplyVisualStylesToHeaderCells; 
        }
 
        ///  
        protected override bool MouseUpUnsharesRow(DataGridViewCellMouseEventArgs e)
        { 
            return e.Button == MouseButtons.Left && this.DataGridView.ApplyVisualStylesToHeaderCells;
        }

        ///  
        protected override void OnMouseDown(DataGridViewCellMouseEventArgs e)
        { 
            if (this.DataGridView == null) 
            {
                return; 
            }
            if (e.Button == MouseButtons.Left &&
                this.DataGridView.ApplyVisualStylesToHeaderCells &&
                !this.DataGridView.ResizingOperationAboutToStart) 
            {
                UpdateButtonState(ButtonState.Pushed, e.RowIndex); 
            } 
        }
 
        /// 
        protected override void OnMouseEnter(int rowIndex)
        {
            if (this.DataGridView == null) 
            {
                return; 
            } 
            if (this.DataGridView.ApplyVisualStylesToHeaderCells)
            { 
                if (this.ColumnIndex == this.DataGridView.MouseDownCellAddress.X &&
                    rowIndex == this.DataGridView.MouseDownCellAddress.Y &&
                    this.ButtonState == ButtonState.Normal &&
                    Control.MouseButtons == MouseButtons.Left && 
                    !this.DataGridView.ResizingOperationAboutToStart)
                { 
                    UpdateButtonState(ButtonState.Pushed, rowIndex); 
                }
                this.DataGridView.InvalidateCell(this.ColumnIndex, rowIndex); 
            }
        }

        ///  
        protected override void OnMouseLeave(int rowIndex)
        { 
            if (this.DataGridView == null) 
            {
                return; 
            }
            if (this.DataGridView.ApplyVisualStylesToHeaderCells)
            {
                if (this.ButtonState != ButtonState.Normal) 
                {
                    Debug.Assert(this.ButtonState == ButtonState.Pushed); 
                    Debug.Assert(this.ColumnIndex == this.DataGridView.MouseDownCellAddress.X); 
                    Debug.Assert(rowIndex == this.DataGridView.MouseDownCellAddress.Y);
                    UpdateButtonState(ButtonState.Normal, rowIndex); 
                }
                this.DataGridView.InvalidateCell(this.ColumnIndex, rowIndex);
            }
        } 

        ///  
        protected override void OnMouseUp(DataGridViewCellMouseEventArgs e) 
        {
            if (this.DataGridView == null) 
            {
                return;
            }
            if (e.Button == MouseButtons.Left && this.DataGridView.ApplyVisualStylesToHeaderCells) 
            {
                UpdateButtonState(ButtonState.Normal, e.RowIndex); 
            } 
        }
 
        /// 
        protected override void Paint(Graphics graphics,
                                      Rectangle clipBounds,
                                      Rectangle cellBounds, 
                                      int rowIndex,
                                      DataGridViewElementStates dataGridViewElementState, 
                                      object value, 
                                      object formattedValue,
                                      string errorText, 
                                      DataGridViewCellStyle cellStyle,
                                      DataGridViewAdvancedBorderStyle advancedBorderStyle,
                                      DataGridViewPaintParts paintParts)
        { 
            if (cellStyle == null)
            { 
                throw new ArgumentNullException("cellStyle"); 
            }
 
            if (DataGridViewCell.PaintBorder(paintParts))
            {
                PaintBorder(graphics, clipBounds, cellBounds, cellStyle, advancedBorderStyle);
            } 

            if (DataGridViewCell.PaintBackground(paintParts)) 
            { 
                Rectangle valBounds = cellBounds;
                Rectangle borderWidths = BorderWidths(advancedBorderStyle); 

                valBounds.Offset(borderWidths.X, borderWidths.Y);
                valBounds.Width -= borderWidths.Right;
                valBounds.Height -= borderWidths.Bottom; 

                bool cellSelected = (dataGridViewElementState & DataGridViewElementStates.Selected) != 0; 
                SolidBrush br = this.DataGridView.GetCachedBrush((DataGridViewCell.PaintSelectionBackground(paintParts) && cellSelected) ? cellStyle.SelectionBackColor : cellStyle.BackColor); 
                if (br.Color.A == 255)
                { 
                    graphics.FillRectangle(br, valBounds);
                }
            }
        } 

        ///  
        ///  
        ///    
        ///       Gets the row Index and column Index of the cell. 
        ///    
        /// 
        public override string ToString()
        { 
            return "DataGridViewHeaderCell { ColumnIndex=" + this.ColumnIndex.ToString(CultureInfo.CurrentCulture) + ", RowIndex=" + this.RowIndex.ToString(CultureInfo.CurrentCulture) + " }";
        } 
 
        private void UpdateButtonState(ButtonState newButtonState, int rowIndex)
        { 
            Debug.Assert(this.DataGridView != null);
            this.ButtonStatePrivate = newButtonState;
            this.DataGridView.InvalidateCell(this.ColumnIndex, rowIndex);
        } 

        private class DataGridViewHeaderCellRenderer 
        { 
            private static VisualStyleRenderer visualStyleRenderer;
 
            private DataGridViewHeaderCellRenderer()
            {
            }
 
            public static VisualStyleRenderer VisualStyleRenderer
            { 
                get 
                {
                    if (visualStyleRenderer == null) 
                    {
                        visualStyleRenderer = new VisualStyleRenderer(VisualStyleElement.Header.Item.Normal);
                    }
 
                    return visualStyleRenderer;
                } 
            } 
        }
    } 
}

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

namespace System.Windows.Forms 
{ 
    using System;
    using System.Diagnostics; 
    using System.ComponentModel;
    using System.Drawing;
    using System.Windows.Forms.VisualStyles;
    using System.Diagnostics.CodeAnalysis; 
    using System.Globalization;
 
    ///  
    /// 
    ///    Identifies a cell in the dataGridView. 
    /// 
    ///
    public class DataGridViewHeaderCell : DataGridViewCell
    { 
        private const byte DATAGRIDVIEWHEADERCELL_themeMargin = 100;  // used to calculate the margins required for XP theming rendering
 
        private static Type defaultFormattedValueType = typeof(System.String); 
        private static Type defaultValueType = typeof(System.Object);
        private static Type cellType = typeof(DataGridViewHeaderCell); 
        private static Rectangle rectThemeMargins = new Rectangle(-1, -1, 0, 0);
        private static readonly int PropValueType = PropertyStore.CreateKey();
        private static readonly int PropButtonState = PropertyStore.CreateKey();
        private static readonly int PropFlipXPThemesBitmap = PropertyStore.CreateKey(); 
        private const string AEROTHEMEFILENAME = "Aero.msstyles";
 
        ///  
        public DataGridViewHeaderCell()
        { 
        }

        /// 
        protected ButtonState ButtonState 
        {
            get 
            { 
                bool found;
                int buttonState = this.Properties.GetInteger(PropButtonState, out found); 
                if (found)
                {
                    return (ButtonState) buttonState;
                } 
                return ButtonState.Normal;
            } 
        } 

        private ButtonState ButtonStatePrivate 
        {
            [
                SuppressMessage("Microsoft.Performance", "CA1803:AvoidCostlyCallsWherePossible") // Enum.IsDefined is OK here. Only specific flag combinations are allowed, and it's debug only anyways.
            ] 
            set
            { 
                Debug.Assert(Enum.IsDefined(typeof(ButtonState), value)); 
                if (this.ButtonState != value)
                { 
                    this.Properties.SetInteger(PropButtonState, (int) value);
                }
            }
        } 

        protected override void Dispose(bool disposing) { 
             if (FlipXPThemesBitmap != null && disposing) { 
                  FlipXPThemesBitmap.Dispose();
             } 
             base.Dispose(disposing);

        }
 
        /// 
        [ 
            Browsable(false) 
        ]
        public override bool Displayed 
        {
            get
            {
                if (this.DataGridView == null || !this.DataGridView.Visible) 
                {
                    // No detached or invisible element is displayed. 
                    return false; 
                }
 
                if (this.OwningRow != null)
                {
                    // row header cell
                    return this.DataGridView.RowHeadersVisible && this.OwningRow.Displayed; 
                }
 
                if (this.OwningColumn != null) 
                {
                    // column header cell 
                    return this.DataGridView.ColumnHeadersVisible && this.OwningColumn.Displayed;
                }

                // top left header cell 
                Debug.Assert(!this.DataGridView.LayoutInfo.dirty);
                return this.DataGridView.LayoutInfo.TopLeftHeader != Rectangle.Empty; 
            } 
        }
 
        internal Bitmap FlipXPThemesBitmap
        {
            get
            { 
                return (Bitmap)this.Properties.GetObject(PropFlipXPThemesBitmap);
            } 
            set 
            {
                if (value != null || this.Properties.ContainsObject(PropFlipXPThemesBitmap)) 
                {
                    this.Properties.SetObject(PropFlipXPThemesBitmap, value);
                }
            } 
        }
 
        ///  
        public override Type FormattedValueType
        { 
            get
            {
                return defaultFormattedValueType;
            } 
        }
 
        ///  
        [
            Browsable(false) 
        ]
        public override bool Frozen
        {
            get 
            {
                if (this.OwningRow != null) 
                { 
                    // row header cell
                    return this.OwningRow.Frozen; 
                }

                if (this.OwningColumn != null)
                { 
                    // column header cell
                    return this.OwningColumn.Frozen; 
                } 

                if (this.DataGridView != null) 
                {
                    // top left header cell
                    return true;
                } 

                // detached header cell 
                return false; 
            }
        } 

        internal override bool HasValueType
        {
            get 
            {
                return this.Properties.ContainsObject(PropValueType) && this.Properties.GetObject(PropValueType) != null; 
            } 
        }
 
        /// 
        [
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden) 
        ]
        public override bool ReadOnly 
        { 
            get
            { 
                return true;
            }
            set
            { 
                throw new InvalidOperationException(SR.GetString(SR.DataGridView_HeaderCellReadOnlyProperty, "ReadOnly"));
            } 
        } 

        ///  
        [
            Browsable(false)
        ]
        public override bool Resizable 
        {
            get 
            { 
                if (this.OwningRow != null)
                { 
                    // must be a row header cell
                    return (this.OwningRow.Resizable == DataGridViewTriState.True) || (this.DataGridView != null && this.DataGridView.RowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing);
                }
 
                if (this.OwningColumn != null)
                { 
                    // must be a column header cell 
                    return (this.OwningColumn.Resizable == DataGridViewTriState.True) ||
                           (this.DataGridView != null && this.DataGridView.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.EnableResizing); 
                }

                // must be the top left header cell
                return this.DataGridView != null && (this.DataGridView.RowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing || this.DataGridView.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.EnableResizing); 
            }
        } 
 
        /// 
        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)
        ]
        public override bool Selected 
        {
            get 
            { 
                return false;
            } 
            set
            {
                throw new InvalidOperationException(SR.GetString(SR.DataGridView_HeaderCellReadOnlyProperty, "Selected"));
            } 
        }
 
        ///  
        public override Type ValueType
        { 
            get
            {
                Type valueType = (Type) this.Properties.GetObject(PropValueType);
                if (valueType != null) 
                {
                    return valueType; 
                } 
                return defaultValueType;
            } 
            set
            {
                if (value != null || this.Properties.ContainsObject(PropValueType))
                { 
                    this.Properties.SetObject(PropValueType, value);
                } 
            } 
        }
 
        /// 
        [
            Browsable(false)
        ] 
        public override bool Visible
        { 
            get 
            {
                if (this.OwningRow != null) 
                {
                    // row header cell
                    return this.OwningRow.Visible &&
                            (this.DataGridView == null || this.DataGridView.RowHeadersVisible); 
                }
 
                if (this.OwningColumn != null) 
                {
                    // column header cell 
                    return this.OwningColumn.Visible &&
                            (this.DataGridView == null || this.DataGridView.ColumnHeadersVisible);
                }
 
                if (this.DataGridView != null)
                { 
                    // top left header cell 
                    return this.DataGridView.RowHeadersVisible && this.DataGridView.ColumnHeadersVisible;
                } 

                return false;
            }
        } 

        ///  
        public override object Clone() 
        {
            DataGridViewHeaderCell dataGridViewCell; 
            Type thisType = this.GetType();
            if (thisType == cellType) //performance improvement
            {
                dataGridViewCell = new DataGridViewHeaderCell(); 
            }
            else 
            { 
                // SECREVIEW : Late-binding does not represent a security thread, see bug#411899 for more info..
                // 
                dataGridViewCell = (DataGridViewHeaderCell)System.Activator.CreateInstance(thisType);
            }
            base.CloneInternal(dataGridViewCell);
            dataGridViewCell.Value = this.Value; 
            return dataGridViewCell;
        } 
 
        /// 
        public override ContextMenuStrip GetInheritedContextMenuStrip(int rowIndex) 
        {
            ContextMenuStrip contextMenuStrip = GetContextMenuStrip(rowIndex);
            if (contextMenuStrip != null)
            { 
                return contextMenuStrip;
            } 
 
            if (this.DataGridView != null)
            { 
                return this.DataGridView.ContextMenuStrip;
            }
            else
            { 
                return null;
            } 
        } 

        ///  
        public override DataGridViewElementStates GetInheritedState(int rowIndex)
        {
            DataGridViewElementStates state = DataGridViewElementStates.ResizableSet | DataGridViewElementStates.ReadOnly;
 
            if (this.OwningRow != null)
            { 
                // row header cell 
                if ((this.DataGridView == null && rowIndex != -1) ||
                    (this.DataGridView != null && (rowIndex < 0 || rowIndex >= this.DataGridView.Rows.Count))) 
                {
                    throw new ArgumentException(SR.GetString(SR.InvalidArgument, "rowIndex", rowIndex.ToString(CultureInfo.CurrentCulture)));
                }
                if (this.DataGridView != null && this.DataGridView.Rows.SharedRow(rowIndex) != this.OwningRow) 
                {
                    throw new ArgumentException(SR.GetString(SR.InvalidArgument, "rowIndex", rowIndex.ToString(CultureInfo.CurrentCulture))); 
                } 
                state |= (this.OwningRow.GetState(rowIndex) & DataGridViewElementStates.Frozen);
                if (this.OwningRow.GetResizable(rowIndex) == DataGridViewTriState.True || (this.DataGridView != null && this.DataGridView.RowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing)) 
                {
                    state |= DataGridViewElementStates.Resizable;
                }
                if (this.OwningRow.GetVisible(rowIndex) && (this.DataGridView == null || this.DataGridView.RowHeadersVisible)) 
                {
                    state |= DataGridViewElementStates.Visible; 
                    if (this.OwningRow.GetDisplayed(rowIndex)) 
                    {
                        state |= DataGridViewElementStates.Displayed; 
                    }
                }
            }
            else if (this.OwningColumn != null) 
            {
                // column header cell 
                if (rowIndex != -1) 
                {
                    throw new ArgumentOutOfRangeException("rowIndex"); 
                }
                state |= (this.OwningColumn.State & DataGridViewElementStates.Frozen);
                if (this.OwningColumn.Resizable == DataGridViewTriState.True ||
                    (this.DataGridView != null && this.DataGridView.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.EnableResizing)) 
                {
                    state |= DataGridViewElementStates.Resizable; 
                } 
                if (this.OwningColumn.Visible && (this.DataGridView == null || this.DataGridView.ColumnHeadersVisible))
                { 
                    state |= DataGridViewElementStates.Visible;
                    if (this.OwningColumn.Displayed)
                    {
                        state |= DataGridViewElementStates.Displayed; 
                    }
                } 
            } 
            else if (this.DataGridView != null)
            { 
                // top left header cell
                if (rowIndex != -1)
                {
                    throw new ArgumentOutOfRangeException("rowIndex"); 
                }
                state |= DataGridViewElementStates.Frozen; 
                if (this.DataGridView.RowHeadersWidthSizeMode == DataGridViewRowHeadersWidthSizeMode.EnableResizing || this.DataGridView.ColumnHeadersHeightSizeMode == DataGridViewColumnHeadersHeightSizeMode.EnableResizing) 
                {
                    state |= DataGridViewElementStates.Resizable; 
                }
                if (this.DataGridView.RowHeadersVisible && this.DataGridView.ColumnHeadersVisible)
                {
                    state |= DataGridViewElementStates.Visible; 
                    if (this.DataGridView.LayoutInfo.TopLeftHeader != Rectangle.Empty)
                    { 
                        state |= DataGridViewElementStates.Displayed; 
                    }
                } 
            }

#if DEBUG
            if (this.OwningRow == null || this.OwningRow.Index != -1) 
            {
                DataGridViewElementStates stateDebug = DataGridViewElementStates.ResizableSet; 
                if (this.Displayed) 
                {
                    stateDebug |= DataGridViewElementStates.Displayed; 
                }
                if (this.Frozen)
                {
                    stateDebug |= DataGridViewElementStates.Frozen; 
                }
                if (this.ReadOnly) 
                { 
                    stateDebug |= DataGridViewElementStates.ReadOnly;
                } 
                if (this.Resizable)
                {
                    stateDebug |= DataGridViewElementStates.Resizable;
                } 
                if (this.Selected)
                { 
                    stateDebug |= DataGridViewElementStates.Selected; 
                }
                if (this.Visible) 
                {
                    stateDebug |= DataGridViewElementStates.Visible;
                }
                Debug.Assert(state == stateDebug); 
            }
#endif 
 
            return state;
        } 

        /// 
        protected override Size GetSize(int rowIndex)
        { 
            if (this.DataGridView == null)
            { 
                // detached cell 
                if (rowIndex != -1)
                { 
                    throw new ArgumentOutOfRangeException("rowIndex");
                }
                return new Size(-1, -1);
            } 
            if (this.OwningColumn != null)
            { 
                // must be a column header cell 
                if (rowIndex != -1)
                { 
                    throw new ArgumentOutOfRangeException("rowIndex");
                }
                return new Size(this.OwningColumn.Thickness, this.DataGridView.ColumnHeadersHeight);
            } 
            else if (this.OwningRow != null)
            { 
                // must be a row header cell 
                if (rowIndex < 0 || rowIndex >= this.DataGridView.Rows.Count)
                { 
                    throw new ArgumentOutOfRangeException("rowIndex");
                }
                if (this.DataGridView.Rows.SharedRow(rowIndex) != this.OwningRow)
                { 
                    throw new ArgumentException(SR.GetString(SR.InvalidArgument, "rowIndex", rowIndex.ToString(CultureInfo.CurrentCulture)));
                } 
                return new Size(this.DataGridView.RowHeadersWidth, this.OwningRow.GetHeight(rowIndex)); 
            }
            else 
            {
                // must be the top left header cell
                if (rowIndex != -1)
                { 
                    throw new ArgumentOutOfRangeException("rowIndex");
                } 
                return new Size(this.DataGridView.RowHeadersWidth, this.DataGridView.ColumnHeadersHeight); 
            }
        } 

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
        internal static Rectangle GetThemeMargins(Graphics g)
        { 
            if (rectThemeMargins.X == -1)
            { 
                Rectangle rectCell = new Rectangle(0, 0, DATAGRIDVIEWHEADERCELL_themeMargin, DATAGRIDVIEWHEADERCELL_themeMargin); 
                Rectangle rectContent = DataGridViewHeaderCellRenderer.VisualStyleRenderer.GetBackgroundContentRectangle(g, rectCell);
                rectThemeMargins.X = rectContent.X; 
                rectThemeMargins.Y = rectContent.Y;
                rectThemeMargins.Width = DATAGRIDVIEWHEADERCELL_themeMargin - rectContent.Right;
                rectThemeMargins.Height = DATAGRIDVIEWHEADERCELL_themeMargin - rectContent.Bottom;
                // On WinXP, the theming margins for a header are unexpectedly (3, 0, 0, 0) when you'd expect something like (0, 0, 2, 3) 
                if (rectThemeMargins.X == 3 &&
                    rectThemeMargins.Y + rectThemeMargins.Width + rectThemeMargins.Height == 0) 
                { 
                    rectThemeMargins = new Rectangle(0, 0, 2, 3);
                } 
                else
                {
                    // On Vista, the theming margins for a header are unexpectedly (0, 0, 0, 0) when you'd expect something like (2, 1, 0, 2)
                    // Padding themePadding = DataGridViewHeaderCellRenderer.VisualStyleRenderer.GetMargins(g, MarginProperty.ContentMargins); /* or MarginProperty.SizingMargins */ 
                    // does not work either at this time. It AVs -So we hard code the margins for now.
                    try 
                    { 
                        string themeFilename = System.IO.Path.GetFileName(System.Windows.Forms.VisualStyles.VisualStyleInformation.ThemeFilename);
                        if (String.Equals(themeFilename, AEROTHEMEFILENAME, StringComparison.OrdinalIgnoreCase)) 
                        {
                            rectThemeMargins = new Rectangle(2, 1, 0, 2);
                        }
                    } 
                    catch
                    { 
                    } 
                }
            } 
            return rectThemeMargins;
        }

        ///  
        protected override object GetValue(int rowIndex)
        { 
            if (rowIndex != -1) 
            {
                throw new ArgumentOutOfRangeException("rowIndex"); 
            }
            return this.Properties.GetObject(PropCellValue);
        }
 
        /// 
        protected override bool MouseDownUnsharesRow(DataGridViewCellMouseEventArgs e) 
        { 
            return e.Button == MouseButtons.Left && this.DataGridView.ApplyVisualStylesToHeaderCells;
        } 

        /// 
        protected override bool MouseEnterUnsharesRow(int rowIndex)
        { 
            return this.ColumnIndex == this.DataGridView.MouseDownCellAddress.X &&
                   rowIndex == this.DataGridView.MouseDownCellAddress.Y && 
                   this.DataGridView.ApplyVisualStylesToHeaderCells; 
        }
 
        /// 
        protected override bool MouseLeaveUnsharesRow(int rowIndex)
        {
            return this.ButtonState != ButtonState.Normal && this.DataGridView.ApplyVisualStylesToHeaderCells; 
        }
 
        ///  
        protected override bool MouseUpUnsharesRow(DataGridViewCellMouseEventArgs e)
        { 
            return e.Button == MouseButtons.Left && this.DataGridView.ApplyVisualStylesToHeaderCells;
        }

        ///  
        protected override void OnMouseDown(DataGridViewCellMouseEventArgs e)
        { 
            if (this.DataGridView == null) 
            {
                return; 
            }
            if (e.Button == MouseButtons.Left &&
                this.DataGridView.ApplyVisualStylesToHeaderCells &&
                !this.DataGridView.ResizingOperationAboutToStart) 
            {
                UpdateButtonState(ButtonState.Pushed, e.RowIndex); 
            } 
        }
 
        /// 
        protected override void OnMouseEnter(int rowIndex)
        {
            if (this.DataGridView == null) 
            {
                return; 
            } 
            if (this.DataGridView.ApplyVisualStylesToHeaderCells)
            { 
                if (this.ColumnIndex == this.DataGridView.MouseDownCellAddress.X &&
                    rowIndex == this.DataGridView.MouseDownCellAddress.Y &&
                    this.ButtonState == ButtonState.Normal &&
                    Control.MouseButtons == MouseButtons.Left && 
                    !this.DataGridView.ResizingOperationAboutToStart)
                { 
                    UpdateButtonState(ButtonState.Pushed, rowIndex); 
                }
                this.DataGridView.InvalidateCell(this.ColumnIndex, rowIndex); 
            }
        }

        ///  
        protected override void OnMouseLeave(int rowIndex)
        { 
            if (this.DataGridView == null) 
            {
                return; 
            }
            if (this.DataGridView.ApplyVisualStylesToHeaderCells)
            {
                if (this.ButtonState != ButtonState.Normal) 
                {
                    Debug.Assert(this.ButtonState == ButtonState.Pushed); 
                    Debug.Assert(this.ColumnIndex == this.DataGridView.MouseDownCellAddress.X); 
                    Debug.Assert(rowIndex == this.DataGridView.MouseDownCellAddress.Y);
                    UpdateButtonState(ButtonState.Normal, rowIndex); 
                }
                this.DataGridView.InvalidateCell(this.ColumnIndex, rowIndex);
            }
        } 

        ///  
        protected override void OnMouseUp(DataGridViewCellMouseEventArgs e) 
        {
            if (this.DataGridView == null) 
            {
                return;
            }
            if (e.Button == MouseButtons.Left && this.DataGridView.ApplyVisualStylesToHeaderCells) 
            {
                UpdateButtonState(ButtonState.Normal, e.RowIndex); 
            } 
        }
 
        /// 
        protected override void Paint(Graphics graphics,
                                      Rectangle clipBounds,
                                      Rectangle cellBounds, 
                                      int rowIndex,
                                      DataGridViewElementStates dataGridViewElementState, 
                                      object value, 
                                      object formattedValue,
                                      string errorText, 
                                      DataGridViewCellStyle cellStyle,
                                      DataGridViewAdvancedBorderStyle advancedBorderStyle,
                                      DataGridViewPaintParts paintParts)
        { 
            if (cellStyle == null)
            { 
                throw new ArgumentNullException("cellStyle"); 
            }
 
            if (DataGridViewCell.PaintBorder(paintParts))
            {
                PaintBorder(graphics, clipBounds, cellBounds, cellStyle, advancedBorderStyle);
            } 

            if (DataGridViewCell.PaintBackground(paintParts)) 
            { 
                Rectangle valBounds = cellBounds;
                Rectangle borderWidths = BorderWidths(advancedBorderStyle); 

                valBounds.Offset(borderWidths.X, borderWidths.Y);
                valBounds.Width -= borderWidths.Right;
                valBounds.Height -= borderWidths.Bottom; 

                bool cellSelected = (dataGridViewElementState & DataGridViewElementStates.Selected) != 0; 
                SolidBrush br = this.DataGridView.GetCachedBrush((DataGridViewCell.PaintSelectionBackground(paintParts) && cellSelected) ? cellStyle.SelectionBackColor : cellStyle.BackColor); 
                if (br.Color.A == 255)
                { 
                    graphics.FillRectangle(br, valBounds);
                }
            }
        } 

        ///  
        ///  
        ///    
        ///       Gets the row Index and column Index of the cell. 
        ///    
        /// 
        public override string ToString()
        { 
            return "DataGridViewHeaderCell { ColumnIndex=" + this.ColumnIndex.ToString(CultureInfo.CurrentCulture) + ", RowIndex=" + this.RowIndex.ToString(CultureInfo.CurrentCulture) + " }";
        } 
 
        private void UpdateButtonState(ButtonState newButtonState, int rowIndex)
        { 
            Debug.Assert(this.DataGridView != null);
            this.ButtonStatePrivate = newButtonState;
            this.DataGridView.InvalidateCell(this.ColumnIndex, rowIndex);
        } 

        private class DataGridViewHeaderCellRenderer 
        { 
            private static VisualStyleRenderer visualStyleRenderer;
 
            private DataGridViewHeaderCellRenderer()
            {
            }
 
            public static VisualStyleRenderer VisualStyleRenderer
            { 
                get 
                {
                    if (visualStyleRenderer == null) 
                    {
                        visualStyleRenderer = new VisualStyleRenderer(VisualStyleElement.Header.Item.Normal);
                    }
 
                    return visualStyleRenderer;
                } 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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