Avalonia 列表拖拽替换
实现目标，在一个ListBox中选择一个子项进行拖拽到另一个ListBox中，拖拽到某一子项区域进行替换axaml代码
1<ListBox
2 Name="consumableListBox"
3 Margin="5"
4 ItemsSource="{Binding ConsumableList}"
5 SelectionMode="Single">
6 <ListBox.ItemTemplate>
7 <DataTemplate>
8 <StackPanel Margin="5,5,5,0">
9 <Border
10 Width="160"
11 Height="100"
12 Margin="0,0,0,5"
13 HorizontalAlignment="Center"
14 Background="Red"
15 CornerRadius="5" />
16 <TextBlock HorizontalAlignment="Center" Text="{Binding}" />
17 </StackPanel>
18 </DataTemplate>
19 </ListBox.ItemTemplate>
20 </ListBox>源ListBox<ListBox
Name="platePositionListBox"
Margin="5"
ItemsSource="{Binding PlatePositionList}"
SelectionMode="Single">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Margin="5,5,5,0">
<Border
Width="160"
Height="100"
Margin="0,0,0,5"
HorizontalAlignment="Center"
Background="Red"
CornerRadius="5" />
<TextBlock HorizontalAlignment="Center" Text="{Binding}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>目标ListBox给源ListBox添加指针移动事件
1 private void SourceList_PointerMoved(object sender, PointerEventArgs e)
2 {
3 // 当拖拽操作开始时，在源列表中开始拖拽
4 if (e.GetCurrentPoint(consumableListBox).Properties.IsLeftButtonPressed)
5 {
6 DataObject dataObject = new DataObject();
7 dataObject.Set("dataObject", consumableListBox.SelectedItem);
8 DragDrop.DoDragDrop(e, dataObject, DragDropEffects.Move);
9 }
10 }源ListBox指针移动 将目标ListBox设为允许拖入
DragDrop.SetAllowDrop(platePositionListBox, true);
由于ListBox没有DropEvent事件，需要进行添加事件
platePositionListBox.AddHandler(DragDrop.DropEvent, PlatePositionListBox_DropEvent, RoutingStrategies.Bubble | RoutingStrategies.Direct);
对应事件实现，其中需要获取到需要替换的项的下标，本处是通过定位进行计算
1 private void PlatePositionListBox_DropEvent(object? sender, DragEventArgs e) 2 { 3 var a = e.Data.Get("dataObject"); 4 if (e.Data.Contains("dataObject") && a != null) 5 { 6 var targetIndex = GetDropTargetIndex(platePositionListBox, e.GetPosition(platePositionListBox)); 7 if (targetIndex >= 0) 8 { 9 if (this.DataContext is PlanViewModel viewModel)10 {11 viewModel.PlatePositionList.RemoveAt(targetIndex);12 viewModel.PlatePositionList.Insert(targetIndex, a.ToString());13 }14 }15 }16 }17 18 19 //获取目标项下标20 private int GetDropTargetIndex(ListBox targetListBox, Avalonia.Point position)21 {22 var itemsControl = targetListBox;23 24 var itemsPoint = GetAllItemDistances(targetListBox);25 var firstItemPanel = (StackPanel)Avalonia.VisualTree.VisualExtensions.FindDescendantOfType(itemsControl);26 var itemContainer = (Control)firstItemPanel;27 var firstItemBounds = itemContainer.Bounds;28 var items = itemsControl.Items;29 var y = firstItemBounds.Y;30 for (int i = 0; i < items.Count; i++)31 {32 if (itemsPoint.Index == -1)33 {34 continue;35 }36 if (position.Y >= itemsPoint.DistanceToTop && position.Y
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