MultiSelectionEditingHelper.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.Utils;
using DevExpress.XtraGrid.Views.Base;
using DevExpress.XtraGrid.Views.Grid.ViewInfo;
using DevExpress.XtraEditors;
using DevExpress.XtraGrid.Columns;

namespace WindowsApplication1
{
    public class MultiSelectionEditingHelper
    {

        private GridView view;
        private RadioGroup radioGroup;
        public MultiSelectionEditingHelper(GridView view, RadioGroup radioGroup)
        {
            this.radioGroup = radioGroup;
            this.view = view;
            this.view.OptionsBehavior.EditorShowMode = EditorShowMode.MouseDownFocused;
            this.view.MouseUp += view_MouseUp;
            this.view.CellValueChanged += view_CellValueChanged;
            this.view.MouseDown += view_MouseDown;
        }

        void view_MouseDown(object sender, MouseEventArgs e)
        {
            if (GetInSelectedCell(e))
            {
                GridHitInfo hi = view.CalcHitInfo(e.Location);
                if (view.FocusedRowHandle == hi.RowHandle)
                {
                    view.FocusedColumn = hi.Column;
                    DXMouseEventArgs.GetMouseArgs(e).Handled = true;
                }
            }
        }

        void view_CellValueChanged(object sender, CellValueChangedEventArgs e)
        {
            OnCellValueChanged(e);
        }

        bool lockEvents;
        private void OnCellValueChanged(CellValueChangedEventArgs e)
        {
            if (lockEvents)
                return;
            lockEvents = true;
            SetSelectedCellsValues(e.Value);
            lockEvents = false;
        }

        private void SetSelectedCellsValues(object value)
        {
            try {
                view.BeginUpdate();
                GridCell[] cells = view.GetSelectedCells();
                ChangeMode mode = (ChangeMode)radioGroup.EditValue;
                foreach(GridCell cell in cells) {
                    int rowHandle = cell.RowHandle;
                    GridColumn column = cell.Column;
                    switch(mode) {
                        case ChangeMode.All:
                            break;
                        case ChangeMode.Column:
                            column = view.FocusedColumn;
                            break;
                        case ChangeMode.Row:
                            rowHandle = view.FocusedRowHandle;
                            break;
                    }
                    view.SetRowCellValue(rowHandle, column, value);
                }
            }
            catch(Exception ex) { }
            finally { view.EndUpdate(); }
        }

        private bool GetInSelectedCell(MouseEventArgs e)
        {
            GridHitInfo hi = view.CalcHitInfo(e.Location);
            return hi.InRowCell && view.IsCellSelected(hi.RowHandle, hi.Column);
        }

        void view_MouseUp(object sender, MouseEventArgs e)
        {
            bool inSelectedCell = GetInSelectedCell(e);
            if (inSelectedCell)
            {
                DXMouseEventArgs.GetMouseArgs(e).Handled = true;
                view.ShowEditorByMouse();
            }
        }
        public void Disable() {
            view.MouseUp -= view_MouseUp;
            view.CellValueChanged -= view_CellValueChanged;
            view.MouseDown -= view_MouseDown;
            view = null;
        }
    }
    public enum ChangeMode {
        All,
        Row,
        Column
    }
}