我正在尝试使用 MVVM
编写拖放功能,这将允许我将 PersonModel
对象从一个 ListView
拖到另一个.
I am trying write Drag and Drop functionality using MVVM
which will allow me to drag PersonModel
objects from one ListView
to another.
这几乎可以工作,但我需要能够从 DragEventArgs 中获取源 ListView 的 ItemsSource,但我不知道该怎么做.
This is almost working but I need to be able to get the ItemsSource of the source ListView from the DragEventArgs which I cant figure out how to do.
private void OnHandleDrop(DragEventArgs e)
{
if (e.Data != null && e.Data.GetDataPresent("myFormat"))
{
var person = e.Data.GetData("myFormat") as PersonModel;
//Gets the ItemsSource of the source ListView
..
//Gets the ItemsSource of the target ListView and Adds the person to it
((ObservableCollection<PersonModel>)(((ListView)e.Source).ItemsSource)).Add(person);
}
}
任何帮助将不胜感激.
谢谢!
我在另一个问题中找到了答案一个>
这样做的方法是将源ListView传递给DragDrow.DoDragDrop方法即.
The way to do it is to pass the source ListView into the DragDrow.DoDragDrop method ie.
在处理ListView的PreviewMouseMove的方法中做-
In the method which handles the PreviewMouseMove for the ListView do-
private static void List_MouseMove(MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
if (e.Source != null)
{
DragDrop.DoDragDrop((ListView)e.Source, (ListView)e.Source, DragDropEffects.Move);
}
}
}
然后在 OnHandleDrop 方法中将代码改为
and then in the OnHandleDrop method change the code to
private static void OnHandleDrop(DragEventArgs e)
{
if (e.Data != null && e.Data.GetDataPresent("System.Windows.Controls.ListView"))
{
//var person = e.Data.GetData("myFormat") as PersonModel;
//Gets the ItemsSource of the source ListView and removes the person
var source = e.Data.GetData("System.Windows.Controls.ListView") as ListView;
if (source != null)
{
var person = source.SelectedItem as PersonModel;
((ObservableCollection<PersonModel>)source.ItemsSource).Remove(person);
//Gets the ItemsSource of the target ListView
((ObservableCollection<PersonModel>)(((ListView)e.Source).ItemsSource)).Add(person);
}
}
}
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