学步园

前几天Jo Muncher's Blog上看到《VS2005的DataGridView 多维合并标题 功能拓展》的文章，对我制作DataGridView多表头大有帮助，并把代码进行了调试，发现还有问题。近日把VB代码修改成C#代码，并对部分BUG进行修改，最终还是把问题攻克了，效果比较理想。见下图

源代码如下：

HeaderUnitView.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data.Sql;
using System.Text;
using System.Drawing;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.ComponentModel.Design.Serialization;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace DataGridViewSampCs
...{
    public partial class HeaderUnitView : DataGridView
    ...{
        private TreeView[] _columnTreeView;
        private ArrayList _columnList = new ArrayList();
        private int _cellHeight = 17;
        private int _columnDeep = 1;
        

        /**//// <summary>
        /// 构造函数
        /// </summary>
        public HeaderUnitView()
        ...{
            InitializeComponent();
        }

        [Description("设置或获得合并表头树的深度")]
        public int ColumnDeep
        ...{
            get
            ...{
                if (this.Columns.Count == 0)
                    _columnDeep = 1;

                this.ColumnHeadersHeight = _cellHeight * _columnDeep;
                return _columnDeep;
            }

            set
            ...{
                if (value < 1)
                    _columnDeep = 1;
                else
                    _columnDeep = value;
                this.ColumnHeadersHeight = _cellHeight * _columnDeep;
            }
        }


        [Description("添加合并式单元格绘制的所需要的节点对象")]
        public TreeView[] ColumnTreeView
        ...{
            get ...{ return _columnTreeView; }
            set
            ...{
                if (_columnTreeView != null)
                ...{
                    for (int i = 0; i <= _columnTreeView.Length - 1; i++)
                        _columnTreeView[i].Dispose();
                }
                _columnTreeView = value;
            }
        }

        [Description("设置添加的字段树的相关属性")]
        public TreeView ColumnTreeViewNode
        ...{
            get ...{ return _columnTreeView[0]; }
        }

        public ArrayList NadirColumnList
        ...{
            get
            ...{
                if (_columnTreeView == null)
                    return null;

                if (_columnTreeView[0] == null)
                    return null;

                if (_columnTreeView[0].Nodes == null)
                    return null;

                if (_columnTreeView[0].Nodes.Count == 0)
                    return null;

                _columnList.Clear();
                GetNadirColumnNodes(_columnList, _columnTreeView[0].Nodes[0], false);
                return _columnList;
            }
        }


        /**////<summary>
        ///绘制合并表头
        ///</summary>
        ///<param name="node">合并表头节点</param>
        ///<param name="e">绘图参数集</param>
        ///<param name="level">结点深度</param>
        ///<remarks></remarks>
        public void PaintUnitHeader(
                        TreeNode node,
                        System.Windows.Forms.DataGridViewCellPaintingEventArgs e,
                        int level)
        ...{
            //根节点时退出递归调用
            if (level == 0)
                return;

            RectangleF uhRectangle;
            int uhWidth;
            SolidBrush gridBrush = new SolidBrush(this.GridColor);
            SolidBrush backColorBrush = new SolidBrush(e.CellStyle.BackColor);
            Pen gridLinePen = new Pen(gridBrush);
            StringFormat textFormat = new StringFormat();


            textFormat.Alignment = StringAlignment.Center;

            uhWidth = GetUnitHeaderWidth(node);
            
            //与原贴算法有所区别在这。
            if( node.Nodes.Count == 0)
            ...{
                uhRectangle = new Rectangle(e.CellBounds.Left, 
                            e.CellBounds.Top + node.Level * _cellHeight,
                            uhWidth - 1, 
                            _cellHeight * (_columnDeep - node.Level) - 1);
            }
            else
            ...{   
                uhRectangle = new Rectangle(
                            e.CellBounds.Left,
                            e.CellBounds.Top + node.Level * _cellHeight,
                            uhWidth - 1,
                            _cellHeight - 1);
            }

            //画矩形
            e.Graphics.FillRectangle(backColorBrush, uhRectangle);
            
            //划底线
            e.Graphics.DrawLine(gridLinePen
                                , uhRectangle.Left
                                , uhRectangle.Bottom
                                , uhRectangle.Right
                                , uhRectangle.Bottom);
            //划右端线
            e.Graphics.DrawLine(gridLinePen
                                , uhRectangle.Right
                                , uhRectangle.Top
                                , uhRectangle.Right
                                , uhRectangle.Bottom);
            /**/////写字段文本

            //e.Graphics.DrawString(node.Text
            //                        , this.Font
            //                        , Brushes.Black
            //                        , uhRectangle
            //                        , textFormat);
            e.Graphics.DrawString(node.Text, this.Font
                                    , Brushes.Black
                                    , uhRectangle.Left +uhRectangle.Width / 2-
                                    e.Graphics.MeasureString(node.Text, this.Font).Width / 2 - 1
                                    , uhRectangle.Top +
                                    uhRectangle.Height / 2 -e.Graphics.MeasureString(node.Text, this.Font).Height / 2);

            /**/////递归调用()
            if (node.PrevNode == null)
                if (node.Parent != null)
                    PaintUnitHeader(node.Parent, e, level -<