WPF拖放 - 从获取原始DragEventArgs源信息 [英] WPF Drag and Drop - Get original source info from DragEventArgs

问题描述

我试图写拖放使用 MVVM 挂断功能，这将让我拖 PersonModel 从一个对象的ListView 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.

这几乎是工作，但我需要能够得到来自DragEventArgs源的ListView我无法弄清楚如何做的的ItemsSource。

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。

Any help would be greatly appreciated.

感谢

推荐答案

我发现的

I found the answer in another question

要做到这一点的方法是到源的ListView传递到该DragDrow.DoDragDrop方法即

The way to do it is to pass the source ListView into the DragDrow.DoDragDrop method ie.

在它处理PreviewMouseMove为ListView做的方法 -

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方法修改代码，

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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