Datagridview 实现二维表头

http://www.cnblogs.com/neuhawk/archive/2006/09/28/517507.html

Datagridview 实现二维表头

      最近把我们的b/s系统,增加智能客户端的功能。确实智能客户端是非常好用的东西。可惜winform的控件功能不怎么强大,相比vb差很多啊。比如 DataGridView不支持二维表头,不支持表尾合计,相比之下 web的好办多了（还是喜欢Web的排版、导航，但喜欢Win的操作性，希望WPF早日流行）。

       但是 MIS系统没有二维表头确实是客户不能接受的,尝试了com控件flexgrid或者开源的SourceGrid3，但都不怎么好用,于是想改造一下 DataGridView。我的做法是在CellPainting做手脚。花了一天时间尝试，只是做出原型，还没有完善，希望有需要的朋友少走弯路。

  1,继承DataGridView，添加表头信息类。
  2，添加CellPainting，代码如下：

   private   void  DataGridViewEx_CellPainting( object  sender, DataGridViewCellPaintingEventArgs e)
         {
             if  (e.RowIndex  ==   - 1 )
             {
              //    int w = dataGridView1.HorizontalScrollingOffset + dataGridView1.TopLeftHeaderCell.Size.Width + dataGridView1.Columns[0].Width + 10;


                Rectangle newRect  =   new  Rectangle(e.CellBounds.X  +   1 ,
               e.CellBounds.Y  +   1 , e.CellBounds.Width  -   4 ,
               e.CellBounds.Height  -   4 );

                 using  (
                    Brush gridBrush  =   new  SolidBrush( this .GridColor),
                    backColorBrush  =   new  SolidBrush(e.CellStyle.BackColor))
                 {
                     using  (Pen gridLinePen  =   new  Pen(gridBrush))
                     {
                         //  Erase the cell.
                        e.Graphics.FillRectangle(backColorBrush, e.CellBounds);

                         //  Draw the grid lines (only the right and bottom lines;
                         //  DataGridView takes care of the others).
                        e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left,
                            e.CellBounds.Bottom  -   1 , e.CellBounds.Right  -   1 ,
                            e.CellBounds.Bottom  -   1 );
                         if  (e.ColumnIndex  >   - 1   &&  topRow != null && topRow.Cells[e.ColumnIndex].ColSpan > 1 )
                         {
                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right  -   1 ,
                                e.CellBounds.Top  +  e.ClipBounds.Height  /   2 , e.CellBounds.Right  -   1 ,
                                e.CellBounds.Bottom);
                        }
                         else
                         {
                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Right  -   1 ,
                                                          e.CellBounds.Top, e.CellBounds.Right  -   1 ,
                                                          e.CellBounds.Bottom);
                        }

                         //  Draw the inset highlight box.
                         //    e.Graphics.DrawRectangle(Pens.Blue, newRect);

                         int  scale  =  e.CellBounds.Height / 3 ;
                         if  (e.ColumnIndex  >   - 1   &&  topRow.Cells[e.ColumnIndex].Text  !=   null )
                         {
                            scale =  e.CellBounds.Height  /   2 ;
                            e.Graphics.DrawLine(gridLinePen, e.CellBounds.Left, e.CellBounds.Bottom  -  e.CellBounds.Height  /   2 , e.CellBounds.Right, e.CellBounds.Bottom  -  e.CellBounds.Height  /   2 );
                        }
                         //  Draw the text content of the cell, ignoring alignment.

                      

                         if  (e.Value  !=   null )
                         {
                            e.Graphics.DrawString(e.Value.ToString(), e.CellStyle.Font,
                                Brushes.Crimson, e.CellBounds.X  +   2 ,
                                e.CellBounds.Y  +  scale +   2 , StringFormat.GenericDefault);



                        }




                         if  (e.ColumnIndex  >   - 1   &&   topRow.Cells[e.ColumnIndex].RelateIndex  >   - 1   &&  topRow.Cells[e.ColumnIndex].Text != null )
                    
                         {
                            Rectangle recCell  =   new  Rectangle(e.CellBounds.X  -   1   -  topRow.Cells[e.ColumnIndex].SpanRowWith,
           e.CellBounds.Y  +   1 , topRow.Cells[e.ColumnIndex].SpanRowWith,
           e.CellBounds.Height  /   2 );


                            StringFormat sf  =   new  StringFormat();

                            sf.Alignment  =  StringAlignment.Center;


                            e.Graphics.DrawString(topRow.Cells[e.ColumnIndex].Text, e.CellStyle.Font, Brushes.Crimson, recCell, sf);

                        }
               
                        e.Handled  =   true ;
                    }
                }
            }

        }

3，调用方法

  dataGridViewEx1.TopRow.Cells[ 2 ].Text  =   " 入库 " ;
            dataGridViewEx1.TopRow.Cells[ 2 ].ColSpan  =   2 ;


            dataGridViewEx1.TopRow.Cells[ 4 ].Text  =   " 出库 " ;
            dataGridViewEx1.TopRow.Cells[ 4 ].ColSpan  =   2 ;

4，效果图


至于表尾合计，也做出了原型。二维表头+表尾合计，基本上满足需求了。