C#中DataGridView多層表頭的制作(1)

C#中DataGridView多層表頭的制作(1)
先看效果:

1.首先要調整表頭的高度,記得在DataGrid中是沒法調整表頭高度,但DataGridView是可以的.
設定ColumnHeadsHeightSizeMode為EnableResizing或DisableResizing.再設定ColumnHeadersHeight

2.要繪製自已的表頭,必須要得到表頭的寬(由開始列,結束列決定)和高(由總層次,第幾層決定),我用一個類對它做了封裝 :

   public class HeaderCell
    {
        private int startColIndex;
        private int endColIndex;
        private int deepCount;
        private int startDeepIndex;
        private int endDeepIndex;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="startColIndex"></param>
        /// <param name="endColIndex"></param>
        /// <param name="deepCount"></param>
        /// <param name="deepIndex">從下往上數,序號從1開始.</param>
        public HeaderCell(int startColIndex, int endColIndex,int startDeepIndex,int endDeepIndex,int deepCount)
        {
            this.startColIndex = startColIndex;
            this.endColIndex = endColIndex;
            this.deepCount = deepCount;
            this.startDeepIndex = startDeepIndex;
            this.endDeepIndex = endDeepIndex;
        }
        public int StartColIndex
        {
            get
            {
                return this.startColIndex;
            }
            set
            {
                this.startColIndex = value;
            }
        }
        public int EndColIndex
        {
            get
            {
                return this.endColIndex;
            }
            set
            {
                this.endColIndex = value;
            }
        }
        public int DeepCount
        {
            get
            {
                return this.deepCount;
            }
            set
            {
                this.deepCount = value;
            }
        }
        public int StartDeepIndex
        {
            get
            {
                return this.startDeepIndex;
            }
            set
            {
                this.startDeepIndex = value;
            }
        }
        public int EndDeepIndex
        {
            get
            {
                return this.endDeepIndex;
            }
            set
            {
                this.endDeepIndex = value;
            }
        }
    }

再做一個函數用來重畫表頭,在這里我還做了一個重載:   

     private void SetColTitle(DataGridView dgv, HeaderCell topColumn, PaintEventArgs e, string title)
        {
            SetColTitle(dgv, topColumn, e, title, dgv.ColumnHeadersDefaultCellStyle.BackColor, dgv.ColumnHeadersDefaultCellStyle.ForeColor);
        }
   private void SetColTitle(DataGridView dgv, HeaderCell topColumn, PaintEventArgs e, string title,Color backColor,Color foreColor)
        {
            int x = 2;
            int width = 0;
            int y = 4;
            int height = (dgv.ColumnHeadersHeight-4)*(topColumn.EndDeepIndex-topColumn.StartDeepIndex+1)/topColumn.DeepCount;
            if (dgv.RowHeadersVisible)
            {
                x += dgv.RowHeadersWidth;
            }
            for (int i = 0; i < topColumn.StartColIndex; i++)
            {
                x += dgv.Columns[i].Width;
            }
            for (int i = topColumn.StartColIndex; i <= topColumn.EndColIndex; i++)
            {
                width += dgv.Columns[i].Width;
            }
            width -= 2;
            y += (dgv.ColumnHeadersHeight-4) * (topColumn.DeepCount - topColumn.EndDeepIndex) / topColumn.DeepCount;

            Rectangle rec = new Rectangle(x, y, width, height);
            Color bkClr = dgv.ColumnHeadersDefaultCellStyle.BackColor;
            if (backColor != null)
            {
                bkClr = backColor;
            }

            e.Graphics.FillRectangle(new SolidBrush(bkClr), rec);
            if (topColumn.StartDeepIndex != 1)
            {
                ControlPaint.DrawBorder(e.Graphics, new Rectangle(x - 1, y + height-2, width + 2, 2), SystemColors.ControlLight, ButtonBorderStyle.Inset);
            }

            StringFormat format1 = new StringFormat();
            format1.Trimming = StringTrimming.EllipsisWord;
            format1.Alignment = StringAlignment.Center;
            format1.LineAlignment = StringAlignment.Center;
            Color foClr = dgv.ColumnHeadersDefaultCellStyle.ForeColor;
            if (foreColor != null)
            {
                foClr = foreColor; 
            }
            e.Graphics.DrawString(title, dgv.ColumnHeadersDefaultCellStyle.Font, new SolidBrush(foClr), rec, format1);

        }

3.添加DataGridView的Paint事件,並在事件中調用SetColTitle函數繪製表頭

this.dataGridView1.Paint += new System.Windows.Forms.PaintEventHandler(this.dataGridView1_Paint);

       private void dataGridView1_Paint(object sender, PaintEventArgs e)
        {
            HeaderCell h = new HeaderCell(1, 3, 3,3, 3);
            SetColTitle((DataGridView)sender, h, e, "第一列", Color.LightGreen, Color.Red);

            HeaderCell hc=new HeaderCell(1,2,2,2,3);
            SetColTitle((DataGridView)sender, hc, e, "第一列",Color.LightGreen,Color.Red);
            HeaderCell hc1 = new HeaderCell(1, 1, 1,1, 3);
            SetColTitle((DataGridView)sender, hc1, e, "分列1", Color.Purple, Color.Red);
            HeaderCell hc2 = new HeaderCell(2, 2, 1, 1,3);
            SetColTitle((DataGridView)sender, hc2, e, "分列2", Color.Pink, Color.Red);

            HeaderCell hc3 = new HeaderCell(3, 3, 1, 2,3);
            SetColTitle((DataGridView)sender, hc3, e, "分列", Color.LightGreen, Color.Red);
        }

4.說明:這個方法做出來的效果現在還是不能用,當調整表頭寬度時和出滾動條時刷新有問題.以後再試研究看.如果還是不行,那就用CellPainting事件做做看吧,再不行,就用Tree加DataGridView做成控件的形式試試.