继续昨天的问题。

昨天的问题，DataGrid的TableStyle的确是一个很复杂的结构，而clone的实现应该是基于prototype模式的，昨天回家的路上感觉还是有点不爽，使用prototype解决这个问题，不是不可以，但是不是很好，应验了Richard的一句话，"There is no right or wrong, but good or bad."（不是原话，意思而已）也正因为Richard说过"Just make it good enough"，我还是想改它，参考了一下Builder模式，写了一个不伦不类的Builder，见笑了。

先说下我对prototype的疑虑：
1、MS并没有将TableStyle做成可以clone的，可见这个东西不适合clone；
2、TableStyle太复杂，clone起来自然也简单不了，基本解决不了问题在clone里，还是乱七八糟。

唉，不知道怎么，坐在电脑前永远也想不了问题，习惯性的在键盘上狂敲而已。

下面看看我的不伦不类的Builder吧，赫赫，见笑了。

 * Copyright (c) runmin@tom.com
 * Sample code, created on 2004-12-15 8:57:15 by runmin.
 * */
#endregion Copyright


using System.Windows.Forms;
#endregion

namespace Runmin.Sample
{

    /// Returns an instance of System.Windows.Forms.DataGridTableStyle class.
    /// </summary>
    public interface ITableStyleBuilder
{

        /// The builder method.
        /// </summary>
        /// <returns>TableStyle instance</returns>
        DataGridTableStyle BuildStyle(string theMappingName);
    }

    public class DefaultTableStyleBuilder : ITableStyleBuilder
{
        private DisplayStyle displayStyle;
        public DisplayStyle DisplayStyle
{
            get
{
                return this.displayStyle;
            }
            set
{
                this.displayStyle = value;
            }
        }


        private DataGridColumnStyle gridColumnStyle;
        public DataGridColumnStyle GridColumnStyle
{
            get
{
                return this.gridColumnStyle;
            }
            set
{
                this.gridColumnStyle = value;
            }
        }


        public virtual DataGridTableStyle BuildStyle(string theMappingName)
{
            DataGridTableStyle theTableStyle = new DataGridTableStyle();

            theTableStyle.MappingName = theMappingName;

            theTableStyle.ForeColor = 
                theTableStyle.HeaderForeColor = 
                theTableStyle.SelectionForeColor = 
                this.displayStyle.ForeColor;

            theTableStyle.BackColor            = this.displayStyle.BackColor;
            theTableStyle.HeaderBackColor      = this.displayStyle.HeaderBackColor;
            theTableStyle.GridLineColor        = this.displayStyle.GridLineColor;
            theTableStyle.SelectionBackColor   = this.displayStyle.SelectionBackColor;

            return theTableStyle;
        }

    }

    public struct DisplayStyle
{
        private System.Drawing.Color backColor;
        public System.Drawing.Color BackColor
{
            get
{
                return backColor;
            }

            set
{
                backColor = value;
            }
        }

        private System.Drawing.Color foreColor;
        public System.Drawing.Color ForeColor
{
            get
{
                return foreColor;
            }

            set
{
                foreColor = value;
            }
        }

        private System.Drawing.Color gridLineColor;
        public System.Drawing.Color GridLineColor
{
            get
{
                return gridLineColor;
            }

            set
{
                gridLineColor = value;
            }
        }

        private System.Drawing.Color headerBackColor;
        public System.Drawing.Color HeaderBackColor
{
            get
{
                return headerBackColor;
            }

            set
{
                headerBackColor = value;
            }
        }

        private System.Drawing.Color selectionBackColor;
        public System.Drawing.Color SelectionBackColor
{
            get
{
                return selectionBackColor;
            }

            set
{
                selectionBackColor = value;
            }
        }

        private System.Drawing.Color alternatingBackColor;
        public System.Drawing.Color AlternatingBackColor
{
            get
{
                return alternatingBackColor;
            }

            set
{
                alternatingBackColor = value;
            }
        }
    }
}