Libs/DirectionCellMergeStrategy.cs

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namespace VS2048
{
    /// <summary>
    /// 通过方向键来控制合并Cell的策略
    /// </summary>
    public class DirectionCellMergeStrategy : ICellMergeStrategy
    {
        CellStyleDictionary _csd = new CellStyleDictionary();
        /// <summary>
        /// 返回当前合并得分
        /// </summary>
        /// <param name="keyVal"></param>
        /// <param name="celltable"></param>
        /// <returns></returns>
        public int Merge(int keyVal, ICell[,] celltable)
        {
            int score = 0;
            switch (keyVal)
            {
                case 37:
                    AlignLeft(celltable);
                    score = MergeLeft(celltable);
                    AlignLeft(celltable);
                    break;
                case 38:
                    AlignTop(celltable);
                    score = MergeTop(celltable);
                    AlignTop(celltable);
                    break;
                case 39:
                    AlignRight(celltable);
                    score = MergeRight(celltable);
                    AlignRight(celltable);
                    break;
                case 40:
                    AlignBottom(celltable);
                    score = MergeBottom(celltable);
                    AlignBottom(celltable);
                    break;
            }
            return score;
        }
        //<-
        private int MergeLeft(ICell[,] celltable)
        {
            int score = 0;
            if (celltable != null)
            {
                for (int i = 0; i < celltable.GetLength(0); i++)
                {
                    for (int j = 0; j < celltable.GetLength(1) - 1; j++)
                    {
                        if ((celltable[i, j] == null) || (celltable[i, j + 1] == null)) continue;
                        if (celltable[i, j].DisplayNum == celltable[i, j + 1].DisplayNum)
                        {
                            int num = int.Parse(celltable[i, j].DisplayNum) * 2;
                            celltable[i, j].DisplayNum = num.ToString();
                            celltable[i, j].BackColor = _csd[num].BackColor;
                            celltable[i, j].TextColor = _csd[num].TextColor;