#region

using System.Windows.Forms;
using DevExpress.XtraEditors;
using DevExpress.XtraGrid;
using DevExpress.XtraGrid.Columns;
using DevExpress.XtraGrid.Views.Grid;

#endregion

namespace CSFrameworkV5.Library.CommonClass
{
    /// <summary>
    ///     GridView移动表格单元管理类, 最后版本:2014-12-30
    /// </summary>
    public class GridMovetor
    {
        /// <summary>
        ///     根据GridView内置有焦点的控件,获取父级GridView
        /// </summary>
        /// <param name="activeControl">当前焦点的控件</param>
        /// <returns></returns>
        private static GridView GetGridViewByFocusEditor(Control activeControl)
        {
            while (activeControl.Parent != null)
            {
                if (activeControl.Parent is GridControl)
                    return (GridView)((GridControl)activeControl.Parent)
                        .FocusedView;

                activeControl = activeControl.Parent;
            }

            return null;
        }

        /// <summary>
        ///     检查当前控件是否GridView内置有焦点的控件
        /// </summary>
        /// <param name="activeControl">当前焦点的控件</param>
        /// <returns></returns>
        public static bool IsGridViewEditorFocus(Control activeControl)
        {
            var isEditor = activeControl is TextBoxBase;
            var view = GetGridViewByFocusEditor(activeControl);
            return isEditor && view != null;
        }

        /// <summary>
        ///     是否最后可编辑的列
        /// </summary>
        /// <param name="view">GridView</param>
        /// <param name="focusedColumn">当前焦点的列</param>
        /// <returns></returns>
        public static bool IsLastEditableColumn(GridView view,
            GridColumn focusedColumn)
        {
            var idx = view.VisibleColumns.IndexOf(focusedColumn);

            for (var i = view.VisibleColumns.Count - 1; i >= 0; i--)
            {
                var col = view.VisibleColumns[i];

                //忽略不可编辑Column
                if (!col.OptionsColumn.AllowEdit) continue;

                if (idx != i) return false; //非最后一个可编辑Column

                return true;
            }

            return true;
        }

        /// <summary>
        ///     移动到下一个可编辑的列
        /// </summary>
        /// <param name="currentCol"></param>
        /// <param name="e"></param>
        public static void MoveNextColumn(GridColumn currentCol)
        {
            for (var i = currentCol.VisibleIndex + 1;
                 i < currentCol.View.VisibleColumns.Count;
                 i++)
            {
                var colTemp = currentCol.View.VisibleColumns[i];
                if (colTemp.OptionsColumn.AllowEdit)
                {
                    currentCol.View.FocusedColumn = colTemp;
                    break;
                }
            }
        }

        /// <summary>
        ///     移动到下一个可编辑的列, 若是当前行的最后一列,则定位下一行的第一个可编辑栏位.
        /// </summary>
        /// <param name="view">GridView</param>
        /// <param name="activeControl">当前焦点的控件</param>
        /// <param name="e"></param>
        public static void MoveNextColumnOrRow(GridView view,
            GridColumn currentCol, KeyPressEventArgs e)
        {
            //若是当前行的最后一列,则定位下一行的第一个可编辑栏位.
            if (IsLastEditableColumn(view, currentCol))
            {
                if (view.FocusedRowHandle + 1 < view.RowCount)
                {
                    view.MoveNext();
                    view.FocusedColumn = view.VisibleColumns[0];
                    e.Handled = true;
                }
            }
            else
            {
                //在当前行定位下一个可编辑栏位.
                MoveNextColumn(view.FocusedColumn);
                e.Handled = true;
            }
        }

        /// <summary>
        ///     处理表格KeyDown事件。
        ///     <para>1.按回车或Tab键自动跳到下一个栏位.</para>
        ///     <para>2.处理在最后一条记录的最后一栏按回车键新增一条记录.</para>
        /// </summary>
        public static void OnGridViewKeyDown(object sender, KeyEventArgs e)
        {
            if (!(e.KeyCode == Keys.Enter || e.KeyCode == Keys.Tab)) return;

            if (sender is GridView)
            {
                var view = (GridView)sender;
                var grid = view.GridControl;

                var isLastCol = IsLastEditableColumn(view, view.FocusedColumn);
                var isLastRow = view.FocusedRowHandle == view.RowCount - 1;

                //不是最后可编辑列, 则移至下一列
                if (isLastCol == false || isLastRow == false)
                {
                    MoveNextColumnOrRow(view, view.FocusedColumn,
                        new KeyPressEventArgs((char)Keys.Enter));
                    e.Handled = true;
                    return; //任务完成,不处理以下任何事务
                }

                //最后一条记录的最后一列,自动添加记录
                if (isLastRow && isLastCol && view.OptionsBehavior.Editable)
                    if (view.GridControl.EmbeddedNavigator.Buttons.CustomButtons
                            .Count > 0)
                    {
                        var addButtonIndex = 0;
                        NavigatorButtonBase addButton =
                            view.GridControl.EmbeddedNavigator.Buttons
                                .CustomButtons[addButtonIndex];
                        view.GridControl.EmbeddedNavigator.Buttons.DoClick(
                            addButton);
                        view.FocusedColumn =
                            view.VisibleColumns[0]; //新增记录后,将焦点移动到第一列
                        e.Handled = true;
                    }
            }
        }
    }
}