DevExpress WinForm GridControl 实现拖动多行到TreeView

 

参考文章：Drag-and-drop of multiple selected grid rows

 

如果列表有使用行内编辑功能，需要将列表的 OptionsBehavior.EditorShowMode 属性设置为 MouseUp 或者 Click

 

        
　　　　
        private GridHitInfo downHitInfo = null;
　　　　 private void myView_MouseDown(object sender, MouseEventArgs e)

        {

            GridView view = sender as GridView;

            downHitInfo = null;

            if (view != null)

            {

                GridHitInfo hitInfo = view.CalcHitInfo(new Point(e.X, e.Y));

                if (e.Button == MouseButtons.Left && hitInfo.InRow && hitInfo.HitTest != GridHitTest.RowIndicator)

                {

                    downHitInfo = hitInfo;

                }

            }

        }



        private void myView_MouseMove(object sender, MouseEventArgs e)

        {

            GridView view = sender as GridView;

            if (e.Button == MouseButtons.Left && downHitInfo != null)

            {

                Size dragSize = SystemInformation.DragSize;

                Rectangle dragRect = new Rectangle(new Point(downHitInfo.HitPoint.X - dragSize.Width/2,downHitInfo.HitPoint.Y - dragSize.Height/2), dragSize);



                if (!dragRect.Contains(new Point(e.X, e.Y)))

                {

                    if (view != null)

                    {

                        List<MyClass> myList = view.GetSelectedRows().Select(rownum => view.GetRow(rownum) as MyClass).ToList();

                        view.GridControl.DoDragDrop(myList, DragDropEffects.Move);

                    }

                    downHitInfo = null;

                    DevExpress.Utils.DXMouseEventArgs.GetMouseArgs(e).Handled = true;

                }

            }

        }



        private void myTreeView_DragOver(object sender, DragEventArgs e)

        {

            e.Effect = e.Data.GetDataPresent(typeof(List<MyClass>)) ? DragDropEffects.Move : DragDropEffects.None;

        }



        private void myTreeView_DragDrop(object sender, DragEventArgs e)

        {

            List<MyClass> modelData = (List<MyClass>)e.Data.GetData(typeof(List<MyClass>));

            TreeNode dropNode = this.myTreeView.GetNodeAt(myTreeView.PointToClient(new Point(e.X, e.Y)));

            //这里写拖动后想要执行的操作

        }