自定义DataGridView外观

      用惯了Delphi第三方花哨的DataGrid控件,面对着VS2005的DataGridView中规中矩界面总觉得有点别扭.试着用了一下Developer Express Inc.NET()的DXperience.XtraGrid,发现跟同公司VCL版差不多,够强.不过感觉用了以后程序界面出现要慢得多了,而且部署时为了这一个Grid还得多带上好几M的Dll,真是不值得呀.

      没办法,只好老老实实的想办法对DataGrid改造一下.毕竟DataGridView还是有很多不错的优点的.我不满意的地方也就是表头和没有间隔行背景.查MSDN,发现了行背景很容易就可以搞掂.在RowPrePaint里重画就行了,前提是要把RowTemplate.DefaultCellStyle.SelectionBackColor设为Color.Transparent.不过RowPrePaint里写的代码好像对表头没什么作用,郁闷...

      再查MSDN,发现CellPainting 可以画表头,照着例子一试,背景是变了,不过文字,分隔线,排序标志什么的都没了.一度想放弃,最后还是在老多的论坛找到了解决方法:DataGridViewPaintParts.

      提一下LinearGradientBrush,果然是好东西,很容易就是把渐变画出来了,够方便(Delphi里怎么就没有类似的呢...)

      把上面提到的几点综合一下,就可以写出一个可以定义表头背景颜色,间隔行颜色和选中行颜色的DataGridView,当然要想用得方便,还是写成一个控件好用:

  

/**/ /****************************（如转载，请保留版权信息）************************
 author：awin                                                              
 e-mail：[email protected]                                                   
 blog：  http://blog.csdn.net/awin                                       
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using  System.Drawing;
using  System.Drawing.Drawing2D;
using  System.Windows.Forms;

namespace  AwinControl.Windows.Forms
... {
 //部分代码只适用于Net2.0  
 [ToolboxBitmap(typeof (GridViewControl), "Bitmap.GridViewControl.bmp")] //定义在工具箱里显示图标,可以去掉
    /**//// 

    /// GridViewControl是一个可定义部分外观的DataGridView
    /// 注意要想使得自画的背景有效,得把DataGridViewa相应的颜色属性设为Color.Transparent,这个在代码里没处理
    /// 

    public class GridViewControl : DataGridView
    ...{
        private Color _ColumnHeaderColor1 = Color.White;
        private Color _ColumnHeaderColor2 = Color.FromArgb(212, 208, 200);
        private Color _SelectedRowColor1 = Color.White;
        private Color _SelectedRowColor2 = Color.FromArgb(171, 217, 254);
        private Color _PrimaryRowColor1 = Color.White;
        private Color _PrimaryRowColor2 = Color.FromArgb(255, 249, 232);
        private Color _SecondaryRowColor1 = Color.White;
        private Color _SecondaryRowColor2 = Color.White;
        private int _SecondaryLength = 2;

        public Color ColumnHeaderColor1 //表头起始颜色
        ...{
            get ...{ return _ColumnHeaderColor1; }
            set
            ...{
                _ColumnHeaderColor1 = value;
                this.Invalidate();
            }
        }

        public Color ColumnHeaderColor2 //表头终止颜色
        ...{
            get ...{ return _ColumnHeaderColor2; }
            set
            ...{
                _ColumnHeaderColor2 = value;
                this.Invalidate();
            }
        }

        public Color PrimaryRowcolor1 //奇行起始颜色
        ...{
            get ...{ return _PrimaryRowColor1; }
            set
            ...{
                if (value.IsEmpty || value == Color.Transparent)
                    _PrimaryRowColor1 = Color.White;
                else
                    _PrimaryRowColor1 = value;
            }
        }

        public Color PrimaryRowcolor2//奇行终止颜色
        ...{
            get ...{ return _PrimaryRowColor2; }
            set
            ...{
                if (value.IsEmpty || value == Color.Transparent)
                    _PrimaryRowColor2 = Color.White;
                else
                    _PrimaryRowColor2 = value;
            }
        }

        public Color SecondaryRowColor1//偶行起始颜色
        ...{
            get ...{ return _SecondaryRowColor1; }
            set
            ...{
                if (value.IsEmpty || value == Color.Transparent)
                    _SecondaryRowColor1 = Color.White;
                else
                    _SecondaryRowColor1 = value;
            }
        }

        public Color SecondaryRowColor2//偶行起始颜色
        ...{
            get ...{ return _SecondaryRowColor2; }
            set
            ...{
                if (value.IsEmpty || value == Color.Transparent)
                    _SecondaryRowColor2 = Color.White;
                else
                    _SecondaryRowColor2 = value;
            }
        }

        public int SecondaryLength //这个长度现在是指导隔多少个行出现一个偶行
        ...{
            get ...{ return _SecondaryLength; }
            set ...{ _SecondaryLength = value; }
        }

        private void Init()
        ...{
            this.RowPrePaint += new DataGridViewRowPrePaintEventHandler(this.GridView_RowPrePaint);
            this.CellPainting += new DataGridViewCellPaintingEventHandler(this.GridView_CellPainting);
        }

        public GridViewControl()
        ...{
            Init();
        }

        public Color SelectedRowColor1 //选中行起始颜色
        ...{
            get ...{ return _SelectedRowColor1; }

            set ...{ _SelectedRowColor1 = value; }
        }

        public Color SelectedRowColor2 //选中行终止颜色
        ...{
            get ...{ return _SelectedRowColor2; }

            set ...{ _SelectedRowColor2 = value; }
        }

        private static void DrawLinearGradient(Rectangle Rec, Graphics Grp, Color Color1, Color Color2)
        ...{
            if (Color1 == Color2)
            ...{
                Brush backbrush = new SolidBrush(Color1);
                Grp.FillRectangle(backbrush, Rec);
            }
            else
            ...{
                using (Brush backbrush =
                    new LinearGradientBrush(Rec, Color1, Color2,
                                            LinearGradientMode.
                                                Vertical))
                ...{
                    Grp.FillRectangle(backbrush, Rec);
                }
            }
        }

        private void GridView_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
        ...{
            if (e.RowIndex == -1)
            ...{
                if (!(_ColumnHeaderColor1 == Color.Transparent) && !(_ColumnHeaderColor2 == Color.Transparent) &&
                    !_ColumnHeaderColor1.IsEmpty && !_ColumnHeaderColor2.IsEmpty)
                ...{
                    DrawLinearGradient(e.CellBounds, e.Graphics, _ColumnHeaderColor1, _ColumnHeaderColor2);
                    e.Paint(e.ClipBounds, (DataGridViewPaintParts.All & ~DataGridViewPaintParts.Background));
                    e.Handled = true;
                }
            }
        }

        private
            void GridView_RowPrePaint
            (object
                 sender,
             DataGridViewRowPrePaintEventArgs e)
        ...{
            Rectangle rowBounds =
                new Rectangle(0, e.RowBounds.Top, this.Columns.GetColumnsWidth(DataGridViewElementStates.Visible) -
                                                  this.HorizontalScrollingOffset + 1,
                              e.RowBounds.Height);
            e.PaintParts &= ~DataGridViewPaintParts.Focus;
            if ((e.State & DataGridViewElementStates.Selected) == DataGridViewElementStates.Selected)
            ...{
                if (this.RowTemplate.DefaultCellStyle.SelectionBackColor == Color.Transparent)
                    DrawLinearGradient(rowBounds, e.Graphics, _SelectedRowColor1, _SelectedRowColor2);
            }
            else
            ...{
                if (this.RowTemplate.DefaultCellStyle.BackColor == Color.Transparent)
                ...{
                    if (e.RowIndex%_SecondaryLength == 1)
                    ...{
                        DrawLinearGradient(rowBounds, e.Graphics, _PrimaryRowColor1, _PrimaryRowColor2);
                    }
                    else
                    ...{
                        DrawLinearGradient(rowBounds, e.Graphics, _SecondaryRowColor1, _SecondaryRowColor2);
                    }
                }
            }
        }
    }
        ;
}