DataGridView操作按鈕列（修改、刪除）

//DataGridView擴展類

//WDataGridView控件

public class WDataGridViewColumn_EditDelete : DataGridViewColumn
    {  
        /// <summary>
       /// 對象名稱：DataGridView操作按鈕列（修改、刪除）
       /// 對象說明：通過本類可以實現，在DataGridView控件中，顯示一個分別包含修改和刪除按鈕的列。
       /// </summary>
        public WDataGridViewColumn_EditDelete()
        {
            this.CellTemplate = new WDataGridViewCell_EditDelete();
            this.HeaderText = "Operate";
        }
    }

    /// <summary>
    /// DataGridView操作按鈕單元格，繼承自DataGridViewButtonCell類。
    /// </summary>
    public class WDataGridViewCell_EditDelete : DataGridViewButtonCell
    {
        private Color m_clBrush = Color.White;
        private Color m_ModiclBrush = Color.FromArgb(47, 186, 0);//修改字體顏色
        private Color m_DelclBrush = Color.Red;//刪除字體顏色

        private bool mouseOnModifyButton = false; // 鼠標是否移動到修改按鈕上
        private bool mouseOnDeleteButton = false; // 鼠標是否移動到刪除按鈕上

        private static string strModify = "修改"; // 修改按鈕背景圖片        
        private static string strDelete = "刪除"; // 刪除按鈕背景圖片


        private static Pen penModify = new Pen(Color.FromArgb(135, 163, 193)); // 修改按鈕邊框顏色
        private static Pen penDelete = new Pen(Color.FromArgb(162, 144, 77));  // 刪除按鈕邊框顏色

        private static int nowColIndex = 0; // 當前列序號
        private static int nowRowIndex = 0; // 當前行序號

        /// <summary>
        /// 對單元格的重繪事件進行的方法重寫。
        /// </summary>
        protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState,
            object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle,
            DataGridViewPaintParts paintParts)
        {
            base.PaintBorder(graphics, clipBounds, cellBounds, cellStyle, advancedBorderStyle);
            cellBounds = PrivatePaint(graphics, cellBounds, rowIndex, cellStyle, true);           
        }


        /// <summary>
        /// 私有的單元格重繪方法，根據鼠標是否移動到按鈕上，對按鈕的不同背景和邊框進行繪制。
        ///  </summary>
        private Rectangle PrivatePaint(Graphics graphics, Rectangle cellBounds, int rowIndex, DataGridViewCellStyle cellStyle, bool clearBackground)
        {
            if (clearBackground) // 是否需要重繪單元格的背景顏色
            {
                Brush brushCellBack;
                if (this.DataGridView.Rows[rowIndex].Selected)
                {
                    brushCellBack = new SolidBrush(cellStyle.SelectionBackColor);
                }
                else
                {
                    brushCellBack = new SolidBrush(cellStyle.BackColor);
                }
                
                graphics.FillRectangle(brushCellBack, cellBounds.X, cellBounds.Y, cellBounds.Width, cellBounds.Height);              
            }

            int width = 16;//圖片寬度
            int height = 16;//圖片高度
            int AllWidth = 32;//圖片總寬度
            int Wdistance = (cellBounds.Width - AllWidth) / 3; //圖片寬度的間距
            int Hdistance = (cellBounds.Height - height) / 2; //圖片高度間距
   
            Rectangle recModify = new Rectangle(cellBounds.Location.X + 1, cellBounds.Y + 1, (cellBounds.Width - 3) / 2, cellBounds.Height - 2);
            Rectangle recDelete = new Rectangle(recModify.Right + 1, cellBounds.Y + 1, (cellBounds.Width - 3) / 2, cellBounds.Height - 2);
           
            Brush brushCellFore = new SolidBrush(m_clBrush);
            if (this.DataGridView.Rows[rowIndex].Selected)
            {
                brushCellFore = new SolidBrush(cellStyle.SelectionForeColor);
            }

            StringFormat sf = new StringFormat();
            //sf.Trimming = StringTrimming.EllipsisCharacter;            
            sf.LineAlignment = StringAlignment.Center;
            sf.Alignment = StringAlignment.Far;
            sf.FormatFlags = StringFormatFlags.NoWrap;

            string szFont = "微軟雅黑"; // 修改按鈕       

            graphics.DrawString(strModify, new Font(szFont, 9), new SolidBrush(m_ModiclBrush), recModify, sf);
            sf.Alignment = StringAlignment.Near;
            graphics.DrawString(strDelete, new Font(szFont, 9), new SolidBrush(m_DelclBrush), recDelete, sf);
            
            brushCellFore.Dispose();

            return cellBounds;
        }


        /// <summary>
        /// 鼠標移動到單元格內時的事件處理，通過坐標判斷鼠標是否移動到了修改或刪除按鈕上，並調用私有的重繪方法進行重繪。
        /// </summary>
        protected override void OnMouseMove(DataGridViewCellMouseEventArgs e)
        {
            if (base.DataGridView == null) return;

            nowColIndex = e.ColumnIndex;
            nowRowIndex = e.RowIndex;

            if (nowColIndex == -1 || nowRowIndex == -1) return;

            Rectangle cellBounds = DataGridView[e.ColumnIndex, e.RowIndex].ContentBounds;
            Rectangle recModify = new Rectangle(cellBounds.Location.X + 1, cellBounds.Y + 1, (cellBounds.Width - 3) / 2, cellBounds.Height - 2);
            Rectangle recDelete = new Rectangle(recModify.Right + 1, cellBounds.Y + 1, (cellBounds.Width - 3) / 2, cellBounds.Height - 2);
      
            if (IsInRect(e.X, e.Y, recModify)) // 鼠標移動到修改按鈕上
            {
                if (!mouseOnModifyButton)
                {
                    mouseOnModifyButton = true;                 
                    DataGridView.Cursor = Cursors.Hand;
                }
            }
            else
            {
                if (mouseOnModifyButton)
                {
                    mouseOnModifyButton = false;
                    DataGridView.Cursor = Cursors.Default;
                }
            }


            if (IsInRect(e.X, e.Y, recDelete)) // 鼠標移動到刪除按鈕上
            {
                if (!mouseOnDeleteButton)
                {
                    mouseOnDeleteButton = true;
                    DataGridView.Cursor = Cursors.Hand;
                }
            }
            else
            {
                if (mouseOnDeleteButton)
                {
                    mouseOnDeleteButton = false;
                    DataGridView.Cursor = Cursors.Default;
                }
            }
        }


        /// <summary>
        /// 鼠標從單元格內移出時的事件處理，調用私有的重繪方法進行重繪。
        /// </summary>
        protected override void OnMouseLeave(int rowIndex)
        {
            if (mouseOnModifyButton != false || mouseOnDeleteButton != false)
            {
                mouseOnModifyButton = false;
                mouseOnDeleteButton = false;
                DataGridView.Cursor = Cursors.Default;
            }
        }

        /// <summary>
        /// 判斷用戶是否單擊了修改按鈕，DataGridView發生CellMouseClick事件時，
        /// 因本單元格中有兩個按鈕，本方法通過坐標判斷用戶是否單擊了修改按鈕。
        /// </summary>
        public static bool IsModifyButtonClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.RowIndex < 0 || e.ColumnIndex < 0) return false;
            if (sender is DataGridView)
            {
                DataGridView DgvGrid = (DataGridView)sender;

                if (DgvGrid.Columns[e.ColumnIndex] is WDataGridViewColumn_EditDelete)
                {
                    Rectangle cellBounds = DgvGrid[e.ColumnIndex, e.RowIndex].ContentBounds;
                    Rectangle recModify = new Rectangle(cellBounds.Location.X + 1, cellBounds.Location.Y + 1, (cellBounds.Width - 3) / 2, cellBounds.Height - 2);
                    if (IsInRect(e.X, e.Y, recModify))
                        return true;
                }
            }
            return false;
        }


        /// <summary>
        /// 判斷用戶是否單擊了刪除按鈕，DataGridView發生CellMouseClick事件時，
        /// 因本單元格中有兩個按鈕，本方法通過坐標判斷用戶是否單擊了刪除按鈕。
        /// </summary>
        public static bool IsDeleteButtonClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            if (e.RowIndex < 0 || e.ColumnIndex < 0) return false;
            if (sender is DataGridView)
            {
                DataGridView DgvGrid = (DataGridView)sender;

                if (DgvGrid.Columns[e.ColumnIndex] is WDataGridViewColumn_EditDelete)
                {
                    Rectangle cellBounds = DgvGrid[e.ColumnIndex, e.RowIndex].ContentBounds;                   
                    Rectangle recDelete = new Rectangle(cellBounds.Location.X + (cellBounds.Width - 3) / 2 + 2, cellBounds.Location.Y + 1, (cellBounds.Width - 3) / 2, cellBounds.Height - 2);
                    if (IsInRect(e.X, e.Y, recDelete))
                        return true;
                }
            }
            return false;
        }


        /// <summary>
        /// 判斷鼠標坐標是否在指定的區域內。
        /// </summary>
        private static bool IsInRect(int x, int y, Rectangle area)
        {
            if (x > area.Left && x < area.Right && y > area.Top && y < area.Bottom)
                return true;
            return false;

        }


    }