WPF DataGrid Drag

自己实现的功能、代码比较简单的DataGrid的Drag处理，着重处理DataGrid里的拖动排序。

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Windows;
  6 using System.Windows.Controls;
  7 using System.Windows.Data;
  8 using System.Windows.Documents;
  9 using System.Windows.Input;
 10 using System.Windows.Media;
 11 using System.Windows.Media.Imaging;
 12 using System.Windows.Navigation;
 13 using System.Windows.Shapes;
 14 using System.Collections.ObjectModel;
 15 
 16 namespace CodeTest.DataGridDragDrop
 17 {
 18     public partial class Page_DataGridDragDrop : Page
 19     {
 20         ObservableCollection<Model_DataGrid> list1;
 21         ObservableCollection<Model_DataGrid> list2;
 22         Point TargetMousePoint;//Drag时Mouse的Point
 23 
 24         public Page_DataGridDragDrop()
 25         {
 26             InitializeComponent();
 27             InitializeDataGrid1();
 28             InitializeDataGrid2();
 29         }
 30         private void InitializeDataGrid1()
 31         {
 32             list1 = new ObservableCollection<Model_DataGrid>();
 33             list1.Add(new Model_DataGrid { Id = 1, Name = "N1" });
 34             list1.Add(new Model_DataGrid { Id = 2, Name = "N2" });
 35             list1.Add(new Model_DataGrid { Id = 3, Name = "N3" });
 36             list1.Add(new Model_DataGrid { Id = 4, Name = "N4" });
 37             list1.Add(new Model_DataGrid { Id = 5, Name = "N5" });
 38             list1.Add(new Model_DataGrid { Id = 6, Name = "N6" });
 39             list1.Add(new Model_DataGrid { Id = 7, Name = "N7" });
 40             list1.Add(new Model_DataGrid { Id = 8, Name = "N8" });
 41             list1.Add(new Model_DataGrid { Id = 9, Name = "N9" });
 42             this.DataGrid1.ItemsSource = list1;
 43         }
 44         private void InitializeDataGrid2()
 45         {
 46             list2 = new ObservableCollection<Model_DataGrid>();
 47             list2.Add(new Model_DataGrid { Id = 1, Name = "Na1" });
 48             list2.Add(new Model_DataGrid { Id = 2, Name = "Na2" });
 49             list2.Add(new Model_DataGrid { Id = 3, Name = "Na3" });
 50             list2.Add(new Model_DataGrid { Id = 4, Name = "Na4" });
 51             list2.Add(new Model_DataGrid { Id = 5, Name = "Na5" });
 52             list2.Add(new Model_DataGrid { Id = 6, Name = "Na6" });
 53             this.DataGrid2.ItemsSource = list2;
 54         }
 55         /// <summary>
 56         /// 拖动处理
 57         /// </summary>
 58         /// <param name="sender"></param>
 59         /// <param name="e"></param>
 60         private void DataGrid1_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
 61         {
 62             Model_DataGrid DraggedItem = null;//源Row
 63             Model_DataGrid TargetItem = null;//目标Row
 64             //查找鼠标点击的源Row
 65             IInputElement element = DataGrid1.InputHitTest(e.GetPosition(DataGrid1));
 66             while(element != DataGrid1)
 67             {
 68                 if(element != null && element is DataGridRow)
 69                 {
 70                     DataGrid1.SelectedItem = ((DataGridRow)element).Item;
 71                     DraggedItem = (Model_DataGrid)DataGrid1.SelectedItem;
 72                     break;
 73                 }
 74                 else
 75                 {
 76                     DataGrid1.SelectedItem = null;
 77                     element = System.Windows.Media.VisualTreeHelper.GetParent(element as System.Windows.DependencyObject) as System.Windows.IInputElement;
 78                 }
 79             }
 80 
 81             if(this.DataGrid1.SelectedCells.Count > 0)
 82             {
 83                 Model_DataGrid DragData = this.DataGrid1.SelectedCells[0].Item as Model_DataGrid;
 84                 DragDrop.DoDragDrop(DataGrid1, DragData, DragDropEffects.Move);
 85                 //拖动结束
 86                 element = DataGrid1.InputHitTest(TargetMousePoint);
 87                 while (element != DataGrid1)
 88                 {
 89                     if (element != null && element is DataGridRow)
 90                     {
 91                         TargetItem = (Model_DataGrid)((DataGridRow)element).Item;
 92                         break;
 93                     }
 94                     else
 95                     {
 96                         element = System.Windows.Media.VisualTreeHelper.GetParent(element as System.Windows.DependencyObject) as System.Windows.IInputElement;
 97                     }
 98                 }
 99                 //处理排序
100                 if (TargetItem != null && !ReferenceEquals(DraggedItem, TargetItem))
101                 {
102                     //remove the source from the list
103                     list1.Remove(DraggedItem);
104 
105                     //get target index
106                     var targetIndex = list1.IndexOf(TargetItem);
107 
108                     //move source at the target's location
109                     list1.Insert(targetIndex, DraggedItem);
110 
111                     //select the dropped item
112                     DataGrid1.SelectedItem = DraggedItem;
113                 }
114             }
115         }
116 
117         private void DataGrid2_Drop(object sender, DragEventArgs e)
118         {
119             IDataObject data = new DataObject();
120             data = e.Data;
121             Model_DataGrid obj = (Model_DataGrid)data.GetData(typeof(Model_DataGrid));
122             Console.WriteLine(obj.Name);
123         }
124         /// <summary>
125         /// 获取拖动结束时鼠标的Point
126         /// </summary>
127         /// <param name="sender"></param>
128         /// <param name="e"></param>
129         private void DataGrid1_DragOver(object sender, DragEventArgs e)
130         {
131             TargetMousePoint = e.GetPosition(DataGrid1);
132         }
133     }
134 }

 

posted @ 2014-06-17 15:04  大树v587  阅读(2022)  评论(0)  编辑  收藏  举报