我在UWP应用程序中有很多列表视图,但我希望能够将一个项目从一个列表视图移动到另一个列表视图。
我知道AllowDrop或CanDragItems属性,尽管我只是不知道该怎么做,但您需要处理一些事件才能使拖放工作。
如果要通过单击“添加”按钮添加ListView控件并在ListView控件之间移动项目,请检查以下代码作为示例。以下代码与官方示例不同,它用于ObservableCollection
完成拖放操作。您可以将项目从源ListView
项目ListView
拖到目标,也可以将项目从原始目标拖到ListView
原始源ListView
。
您可以单击Add
两次按钮,然后ListView
添加两个包含两个项目的按钮。您可以将任何项目从任何ListView
控件拖到另一个。如果要将拖动的项目保留在源代码ListView
管理中,只需注释代码dragCollection.Remove(dragedItem as string);
。
例如:
private ObservableCollection<string> dragCollection;
private ObservableCollection<string> dropCollection;
private object dragedItem;
private ListView dragListView;
private ListView dropListView;
……
private void AddButton_Click(object sender, RoutedEventArgs e)
{
ListView listView = new ListView();
listView.CanDragItems = true;
listView.CanDrag = true;
listView.AllowDrop = true;
listView.ReorderMode = ListViewReorderMode.Enabled;
listView.CanReorderItems = true;
listView.ItemsSource = new ObservableCollection<string>() { "item1","item2" };
listView.DragItemsStarting += ListView_DragItemsStarting;
//listView.DropCompleted += ListView_DropCompleted;
listView.DragEnter += ListView_DragEnter;
listView.Drop += ListView_Drop;
listView.DragOver += ListView_DragOver;
listView.BorderBrush = new SolidColorBrush(Colors.Red);
listView.BorderThickness = new Thickness(1);
stackPanel.Children.Add(listView);
}
private void ListView_DragOver(object sender, DragEventArgs e)
{
e.AcceptedOperation = DataPackageOperation.Move;
}
private void ListView_Drop(object sender, DragEventArgs e)
{
dropListView = sender as ListView;
if(dropListView!=null)
{
dropCollection = dropListView.ItemsSource as ObservableCollection<string>;
if (dragedItem != null)
{
dropCollection.Add(dragedItem as string);
//If you need to delete the draged item in the source ListView, then use the following code
dragCollection.Remove(dragedItem as string);
dragedItem = null;
}
}
}
private void ListView_DragEnter(object sender, DragEventArgs e)
{
e.AcceptedOperation = (e.DataView.Contains(StandardDataFormats.Text) ? DataPackageOperation.Move : DataPackageOperation.None);
}
private void ListView_DropCompleted(UIElement sender, DropCompletedEventArgs args)
{
var listView = sender as ListView;
if (listView != null)
{
dropListView = listView;
dropCollection = listView.ItemsSource as ObservableCollection<string>;
if(dropListView==dragListView)
{
return;
}
}
}
private void ListView_DragItemsStarting(object sender, DragItemsStartingEventArgs e)
{
var listView = sender as ListView;
if(listView!=null)
{
dragListView = listView;
dragCollection = listView.ItemsSource as ObservableCollection<string>;
if (dropListView == dragListView)
{
return;
}
if(e.Items.Count==1)
{
dragedItem = e.Items[0];
e.Data.RequestedOperation = Windows.ApplicationModel.DataTransfer.DataPackageOperation.Move;
}
}
}
有关拖放的更多信息,您可以参考文档(https://docs.microsoft.com/en-us/windows/uwp/design/input/drag-and-drop)。
对代码有任何疑问,请随时与我联系。
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