WPF DataGrid Drag



DataGrid里的拖动排序  转：http://www.cnblogs.com/yhnbgfd/p/3792806.html

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Collections.ObjectModel;

namespace CodeTest.DataGridDragDrop
{
    public partial class Page_DataGridDragDrop : Page
    {
        ObservableCollection<Model_DataGrid> list1;
        ObservableCollection<Model_DataGrid> list2;
        Point TargetMousePoint;//Drag时Mouse的Point

        public Page_DataGridDragDrop()
        {
            InitializeComponent();
            InitializeDataGrid1();
            InitializeDataGrid2();
        }
        private void InitializeDataGrid1()
        {
            list1 = new ObservableCollection<Model_DataGrid>();
            list1.Add(new Model_DataGrid { Id = 1, Name = "N1" });
            list1.Add(new Model_DataGrid { Id = 2, Name = "N2" });
            list1.Add(new Model_DataGrid { Id = 3, Name = "N3" });
            list1.Add(new Model_DataGrid { Id = 4, Name = "N4" });
            list1.Add(new Model_DataGrid { Id = 5, Name = "N5" });
            list1.Add(new Model_DataGrid { Id = 6, Name = "N6" });
            list1.Add(new Model_DataGrid { Id = 7, Name = "N7" });
            list1.Add(new Model_DataGrid { Id = 8, Name = "N8" });
            list1.Add(new Model_DataGrid { Id = 9, Name = "N9" });
            this.DataGrid1.ItemsSource = list1;
        }
        private void InitializeDataGrid2()
        {
            list2 = new ObservableCollection<Model_DataGrid>();
            list2.Add(new Model_DataGrid { Id = 1, Name = "Na1" });
            list2.Add(new Model_DataGrid { Id = 2, Name = "Na2" });
            list2.Add(new Model_DataGrid { Id = 3, Name = "Na3" });
            list2.Add(new Model_DataGrid { Id = 4, Name = "Na4" });
            list2.Add(new Model_DataGrid { Id = 5, Name = "Na5" });
            list2.Add(new Model_DataGrid { Id = 6, Name = "Na6" });
            this.DataGrid2.ItemsSource = list2;
        }
        /// <summary>
        /// 拖动处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DataGrid1_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            Model_DataGrid DraggedItem = null;//源Row
            Model_DataGrid TargetItem = null;//目标Row
            //查找鼠标点击的源Row
            IInputElement element = DataGrid1.InputHitTest(e.GetPosition(DataGrid1));
            while(element != DataGrid1)
            {
                if(element != null && element is DataGridRow)
                {
                    DataGrid1.SelectedItem = ((DataGridRow)element).Item;
                    DraggedItem = (Model_DataGrid)DataGrid1.SelectedItem;
                    break;
                }
                else
                {
                    DataGrid1.SelectedItem = null;
                    element = System.Windows.Media.VisualTreeHelper.GetParent(element as System.Windows.DependencyObject) as System.Windows.IInputElement;
                }
            }

            if(this.DataGrid1.SelectedCells.Count > 0)
            {
                Model_DataGrid DragData = this.DataGrid1.SelectedCells[0].Item as Model_DataGrid;
                DragDrop.DoDragDrop(DataGrid1, DragData, DragDropEffects.Move);
                //拖动结束
                element = DataGrid1.InputHitTest(TargetMousePoint);
                while (element != DataGrid1)
                {
                    if (element != null && element is DataGridRow)
                    {
                        TargetItem = (Model_DataGrid)((DataGridRow)element).Item;
                        break;
                    }
                    else
                    {
                        element = System.Windows.Media.VisualTreeHelper.GetParent(element as System.Windows.DependencyObject) as System.Windows.IInputElement;
                    }
                }
                //处理排序
                if (TargetItem != null && !ReferenceEquals(DraggedItem, TargetItem))
                {
                    //remove the source from the list
                    list1.Remove(DraggedItem);

                    //get target index
                    var targetIndex = list1.IndexOf(TargetItem);

                    //move source at the target's location
                    list1.Insert(targetIndex, DraggedItem);

                    //select the dropped item
                    DataGrid1.SelectedItem = DraggedItem;
                }
            }
        }

        private void DataGrid2_Drop(object sender, DragEventArgs e)
        {
            IDataObject data = new DataObject();
            data = e.Data;
            Model_DataGrid obj = (Model_DataGrid)data.GetData(typeof(Model_DataGrid));
            Console.WriteLine(obj.Name);
        }
        /// <summary>
        /// 获取拖动结束时鼠标的Point
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DataGrid1_DragOver(object sender, DragEventArgs e)
        {
            TargetMousePoint = e.GetPosition(DataGrid1);
        }
    }
}