Move the element from one ListBox'a to another.

[nishika]

There are 4 ListBox, of which three can be reset and tagged into the fourth, not moved but copied. How do you describe the events of the host ListBox?

<ListBox x:Name="listhelmets" Height="214"  Width="248"
 ItemsSource="{Binding ListHelmets}" 
 IsSynchronizedWithCurrentItem="True" Canvas.Left="464"Canvas.Top="37" 
 PreviewMouseDown="helmet_MouseDown1" 
 PreviewMouseLeftButtonDown="helmet_PreviewMouseLeftButtonDown"    
 DragLeave="helmet_DragLeave"
 PreviewMouseMove="helmet_PreviewMouseMove" 
 SelectedValuePath="protection">
    <ListBox.ItemTemplate >
        <DataTemplate >
            <StackPanel Orientation="Horizontal">
                <Image Source="{Binding Path=Image}" Width="56"      Height="61"/>
                <TextBox Height="30" Width="30">
                  <Binding Path="protection" />
                   </TextBox>
               </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

in this:

<ListBox x:Name="listHero" Height="148" Width="158" 
    <ListBox.ItemTemplate >
        <DataTemplate >
            <StackPanel Orientation="Horizontal">
             </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

for the first ListBox:

     private void helmet_MouseDown1(object sender, MouseButtonEventArgs  e)
    {
      _startPoint = e.GetPosition(null);
  }
private void helmet_PreviewMouseMove(object sender, MouseEventArgs e)

{

if (e.LeftButton != MouseButtonState.Pressed) return;

Point mousePos = e.GetPosition(null);

Vector diff = startPoint - mousePos;

if (Math.Abs(diff.X) <= SystemParameters.MinimumHorizontalDragDistance

&& Math.Abs(diff.Y) <= SystemParameters.MinimumVerticalDragDistance)

return;

var lst = sender as ListBox;

var li = FindAnchestor<ListBoxItem>((DependencyObject)e.OriginalSource);

Console.WriteLine("move " + li);

if (li == null) return;

var str = lst.ItemContainerGenerator.ItemFromContainer(li);

var data = new DataObject("txt", str);

var res = DragDrop.DoDragDrop(li, data, DragDropEffects.All);

if (res == DragDropEffects.Move)

(lst.ItemsSource as IList).Remove(str);

}

static T FindAnchestor<T>(DependencyObject current) where T :  DependencyObject

{

do

{

if (current is T) return (T)current;

current = VisualTreeHelper.GetParent(current);

}

while (current != null);

return null;

}

UPDATE  private void listHero_Drop(object sender, System.Windows.DragEventArgs e)

{

var o = e.Data.GetData("txt");

var lst = sender as ListBox;

(lst.ItemsSource as IList).Add(o);

e.Effects = DragDropEffects.Move;

}
 private void ListHero_OnDragEnter(object sender,    System.Windows.DragEventArgs e)
{
     if (e.Data.GetDataPresent("txt"))
 e.Effects = DragDropEffects.Move;

}`

[Demir]

How do you describe the events of the receiving leafbox?

Add Drop and DragEnter

<ListBox Drop="ListBox_Drop" DragEnter="ListBox_DragEnter" />

In cs add a code for processors, approximately:

void ListBox_Drop(object sender, DragEventArgs e) {
   var o = e.Data.GetData(...) as ...;
   ... 
   e.Effects = DragDropEffects....;
}
void ListBox_DragEnter(object sender, DragEventArgs e) { 
   if (e.Data.GetDataPresent(...))
      e.Effects = DragDropEffects....;
}  

The code to be in processors is in the example. https://ru.stackoverflow.com/revisions/477112/3 ♪

---

UPDATE: https://ru.stackoverflow.com/revisions/478351/3 , stacking the lines, replaced the following.
UPDATE: v2, retrieval of objects of different type.

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Width="300" Height="300">
    <StackPanel>
        <ListBox ItemsSource="{Binding Items1}" Height="100"
            PreviewMouseLeftButtonDown="DragList_PreviewMouseLeftButtonDown" 
            PreviewMouseMove="DragList_PreviewMouseMove"/>
        <ListBox ItemsSource="{Binding Items2}" 
            Drop="ListBox_Drop" DragEnter="ListBox_DragEnter" 
            Background="LightYellow" Height="200"
            AllowDrop="True" />
    </StackPanel>
</Window>

---

interface IData { }
class Data1 : IData { 
   public override string ToString() { return "Data1"; }}
class Data2 : IData { 
   public override string ToString() { return "Data2"; }}
partial class MainWindow : Window {
public MainWindow() {
    Items1 = new ObservableCollection<object>() { new Data1(), new Data2() };
    Items2 = new ObservableCollection<object>();
    this.DataContext = this;
}

public ObservableCollection<object> Items1 { get; set; }
public ObservableCollection<object> Items2 { get; set; }

Point startPoint;
void DragList_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) {
    startPoint = e.GetPosition(null);
}
void DragList_PreviewMouseMove(object sender, MouseEventArgs e) {
    if (e.LeftButton != MouseButtonState.Pressed) return;
    Point mousePos = e.GetPosition(null);
    Vector diff = startPoint - mousePos;
    if (Math.Abs(diff.X) <= SystemParameters.MinimumHorizontalDragDistance
     && Math.Abs(diff.Y) <= SystemParameters.MinimumVerticalDragDistance)
        return;
    var lst = sender as ListBox;
    var li = FindAnchestor<ListBoxItem>((DependencyObject)e.OriginalSource);
    Console.WriteLine("move " + li);
    if (li == null) return;
    var o = lst.ItemContainerGenerator.ItemFromContainer(li);
    var data = new DataObject(typeof(IData), o);
    var res = DragDrop.DoDragDrop(li, data, DragDropEffects.All);
    if (res == DragDropEffects.Move)
        (lst.ItemsSource as IList).Remove(o);
}

void ListBox_Drop(object sender, DragEventArgs e) {
    var o = e.Data.GetData(typeof(IData));
    var lst = sender as ListBox;
    (lst.ItemsSource as IList).Add(o);
    e.Effects = DragDropEffects.Move;
}

void ListBox_DragEnter(object sender, DragEventArgs e) {
    if (e.Data.GetDataPresent(typeof(IData)))
        e.Effects = DragDropEffects.Move;
}

static T FindAnchestor<T>(DependencyObject current) where T : DependencyObject {
    do {
        if (current is T) return (T)current;
        current = VisualTreeHelper.GetParent(current);
    }
    while (current != null);
    return null;
}

}