66 lines
1.9 KiB
C#
66 lines
1.9 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Threading.Tasks;
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using Avalonia.Controls;
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using Avalonia.Input;
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namespace DragAndDropSample;
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public partial class MainWindow : Window
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{
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private const string CustomFormat = "application/xxx-avalonia-controlcatalog-custom";
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class ItemListBox
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{
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public string Name { get; set; }
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}
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private List<ItemListBox> right_listbox =
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[
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new ItemListBox { Name = "123" },
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new ItemListBox { Name = "321" },
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new ItemListBox { Name = "222" },
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new ItemListBox { Name = "555" }
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];
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private ObservableCollection<ItemListBox> left_listbox =
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[
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new ItemListBox { Name = "666" },
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new ItemListBox { Name = "777" },
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new ItemListBox { Name = "111" },
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new ItemListBox { Name = "333" }
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];
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public MainWindow()
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{
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InitializeComponent();
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RightBox.ItemsSource = right_listbox;
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LeftBox.ItemsSource = left_listbox;
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DnDSetup(
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d =>
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{
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d.Set(CustomFormat, RightBox.SelectedItem as ItemListBox ?? throw new InvalidOperationException());
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return Task.CompletedTask;
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},
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DragDropEffects.Move);
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}
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private void DnDSetup(Func<DataObject, Task> factory, DragDropEffects effects)
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{
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async void DoDrag(object sender, PointerPressedEventArgs e)
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{
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var dragData = new DataObject();
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await factory(dragData);
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var result = await DragDrop.DoDragDrop(e, dragData, effects);
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}
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async void Drop(object sender, DragEventArgs e)
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{
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var sample = e.Data as DataObject;
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left_listbox.Add(sample.Get(CustomFormat) as ItemListBox);
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}
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RightBox.PointerPressed += DoDrag;
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AddHandler(DragDrop.DropEvent, Drop);
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}
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} |