WPF 实现拖放的简单实例(Drag & Drop)
概述:拖放的原理不再说明,wpf实现的简单实例
一、XAML部分
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1 <Window x:Class="WpfDragDropGrid.MainWindow" 2 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 3 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 4 Loaded="Window_Loaded" 5 Title="MainWindow" Height="450" Width="600"> 6 <Grid> 7 <Grid.ColumnDefinitions> 8 <ColumnDefinition Width="269*"/> 9 <ColumnDefinition Width="11*"/> 10 <ColumnDefinition Width="312*"/> 11 </Grid.ColumnDefinitions> 12 <DataGrid x:Name="dgRight" Margin="0" Grid.Column="2" AutoGenerateColumns="False" Drop="dgRight_Drop" 13 IsReadOnly="True" SelectionMode="Single" AllowDrop="True"> 14 <DataGrid.Columns> 15 <DataGridTextColumn Binding="{Binding devname}" ClipboardContentBinding="{x:Null}" Header="设备" Width="*"/> 16 <DataGridTextColumn Binding="{Binding spot1}" ClipboardContentBinding="{x:Null}" Header="测点1" Width="*"/> 17 <DataGridTextColumn Binding="{Binding spot2}" ClipboardContentBinding="{x:Null}" Header="测点2" Width="*"/> 18 <DataGridTextColumn Binding="{Binding spot3}" ClipboardContentBinding="{x:Null}" Header="测点3" Width="*"/> 19 </DataGrid.Columns> 20 </DataGrid> 21 <ListBox x:Name="listBox" Margin="0" Background="#FFF1EFBD" AllowDrop="True" 22 PreviewMouseLeftButtonDown="listBox_PreviewMouseLeftButtonDown"/> 23 </Grid> 24 </Window>
二、代码部分
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1 using System; 2 using System.Collections.ObjectModel; 3 using System.Windows; 4 using System.Windows.Controls; 5 using System.Windows.Input; 6 using System.Windows.Media; 7 8 namespace WpfDragDropGrid 9 { 10 /// <summary> 11 /// MainWindow.xaml 的交互逻辑 12 /// </summary> 13 public partial class MainWindow : Window 14 { 15 ObservableCollection<Record> recordLeftList = new ObservableCollection<Record>(); 16 ObservableCollection<Record> recordRightList = new ObservableCollection<Record>(); 17 public MainWindow() 18 { 19 InitializeComponent(); 20 } 21 22 private void Window_Loaded(object sender, RoutedEventArgs e) 23 { 24 listBox.ItemsSource = recordLeftList; 25 listBox.DisplayMemberPath = "devname"; 26 dgRight.ItemsSource = recordRightList; 27 Random ran = new Random(); 28 for (int i = 0; i < 10; i++) 29 { 30 recordLeftList.Add(new Record() { devname="dev"+i,spot1=ran.Next(1,100),spot2=ran.Next(1,100),spot3=ran.Next(1,100)}); 31 } 32 } 33 34 private void listBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) 35 { 36 Point pos = e.GetPosition(listBox); 37 HitTestResult result = VisualTreeHelper.HitTest(listBox, pos); 38 if (null == result) return; 39 40 ListBoxItem listBoxItem = Utils.FindVisualParent<ListBoxItem>(result.VisualHit); // Find your actual visual you want to drag 41 if (listBoxItem == null || listBoxItem.Content != listBox.SelectedItem || !(listBox.SelectedItem is Record)) 42 return; 43 44 Record record = listBoxItem.Content as Record; 45 DataObject dataObject = new DataObject(record); 46 // Here, we should notice that dragsource param will specify on which 47 // control the drag&drop event will be fired 48 System.Windows.DragDrop.DoDragDrop(listBox, dataObject, DragDropEffects.Copy); 49 50 } 51 52 private void dgRight_Drop(object sender, DragEventArgs e) 53 { 54 Point pos = e.GetPosition(dgRight); 55 HitTestResult result = VisualTreeHelper.HitTest(dgRight, pos); 56 if (result == null) 57 return; 58 59 Record sourceRecord = e.Data.GetData(typeof(Record)) as Record; 60 if (sourceRecord != null) 61 recordRightList.Add(sourceRecord); 62 } 63 } 64 65 //工具类方法,来自网络(很通用,所以借鉴于此,多谢原创) 66 internal static class Utils 67 { 68 //根据子元素查找父元素 69 public static T FindVisualParent<T>(DependencyObject obj) where T : class 70 { 71 while (obj != null) 72 { 73 if (obj is T) 74 return obj as T; 75 76 obj = VisualTreeHelper.GetParent(obj); 77 } 78 return null; 79 } 80 } 81 82 //实体类 83 public class Record 84 { 85 public string devname 86 { get; set; } 87 88 public double spot1 89 { get; set; } 90 91 public double spot2 92 { get; set; } 93 94 public double spot3 95 { get; set; } 96 } 97 }