WPF中LISTITEM的拖拽

来源：互联网发布：stc下载软件编辑：程序博客网时间：2024/06/07 03:18
此方法较容易实现list中项的拖拽，不过其缺陷是无法将选中的ITEM取出来，SELECTED事件被MOUSELEFTBUTTONDOWN吃掉了。
不罗嗦了，以下是DEMO的源码：
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;using System.Collections;namespace DragTest{    /// <summary>    /// MainWindow.xaml 的交互逻辑    /// </summary>    public partial class MainWindow : Window    {        ObservableCollection<string> obv = new ObservableCollection<string>();        public MainWindow()        {            InitializeComponent();            foreach (TimeZoneInfo tzi in TimeZoneInfo.GetSystemTimeZones())            {              lst1.Items.Add(tzi.ToString());            }                   }        ListView dragSource = null;        private void lst1_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)        {            ListView parent = (ListView)sender;            dragSource = parent;            object data = GetDataFromListBox(dragSource, e.GetPosition(parent));            if (data != null)            {                                DragDrop.DoDragDrop(parent, data, DragDropEffects.Copy);            }        }        private static object GetDataFromListBox(ListBox source, Point point)        {            UIElement element = source.InputHitTest(point) as UIElement;            if (element != null)            {                object data = DependencyProperty.UnsetValue;                while (data == DependencyProperty.UnsetValue)                {                    data = source.ItemContainerGenerator.ItemFromContainer(element);                    if (data == DependencyProperty.UnsetValue)                    {                        element = VisualTreeHelper.GetParent(element) as UIElement;                    }                    if (element == source)                    {                        return null;                    }                }                if (data != DependencyProperty.UnsetValue)                {                    return data;                }            }            return null;        }        //listbox1 to listbox2        private void lst2_Drop(object sender, DragEventArgs e)        {            ListView parent = (ListView)sender;            if (parent.Name == lst2.Name)            {                object data = e.Data.GetData(typeof(string));                ((IList)dragSource.Items).Remove(data);                if (!parent.Items.Contains(data))                {                    parent.Items.Add(data);                }            }        }        //listbox2 to listbox1        private void lst1_Drop(object sender, DragEventArgs e)        {                        ListView parent = (ListView)sender;            if (parent.Name == lst1.Name)            {                object data = e.Data.GetData(typeof(string));                ((IList)dragSource.Items).Remove(data);                if (!parent.Items.Contains(data))                {                    parent.Items.Add(data);                }            }        }        private void lst2_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)        {            ListView parent = (ListView)sender;            dragSource = parent;            object data = GetDataFromListBox(dragSource, e.GetPosition(parent));            if (data != null)            {                DragDrop.DoDragDrop(parent, data, DragDropEffects.Move);            }        }    }}