private void DragDropDown(object sender, MouseButtonEventArgs e)
{
this.sourceBox = (ListBox)sender;
Visual visual = e.OriginalSource as Visual;
this.topWindow = Window.GetWindow(this.sourceBox);
this.startPoint = e.GetPosition(this.topWindow);
this.sourceItem = sourceBox.ContainerFromElement(visual) as ListBoxItem;
if (this.sourceItem != null)
{
this.draggedData = (int)this.sourceItem.DataContext;
}
}
// Check if Drag & Drop is initiated
private void ListBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// Handle Doubleclick
if (e.ClickCount > 1)
return;
// Remember DragStartPosition
dragSource = (ListBox) sender;
dragStartPoint = e.GetPosition(dragSource);
// if this element is selected, supress click to allow multiple selections
var listItem = dragSource.ContainerFromElement((Visual) e.OriginalSource) as FrameworkElement;
if (listItem == null)
return;
currentClickedSchüler = dragSource.ItemContainerGenerator.ItemFromContainer(listItem) as Schueler;
if (dragSource.SelectedItems.Contains(currentClickedSchüler))
{
// Prevent further handling to allow Drag and Drop of multi-selections
// Remember to handle it later with DragMoveStarted flag
e.Handled = true;
DragMoveStarted = true;
}
}
