private void OnListBoxMouseMove(Object sender, MouseEventArgs e)
{
if (!_draggingItem)
{
return;
}
// Get the current mouse position
Point mousePosition = e.GetPosition(null);
Vector diff = _mouseStartPosition - mousePosition;
if (e.LeftButton == MouseButtonState.Pressed &&
(Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance))
{
ListBoxItem listBoxItem = MesVisualTreeUtility.FindParent <ListBoxItem>(
(DependencyObject)e.OriginalSource);
if (listBoxItem == null)
{
return;
}
MesToolboxItemViewModel itemViewModel = (MesToolboxItemViewModel)ListBox.ItemContainerGenerator.
ItemFromContainer(listBoxItem);
DataObject dragData = new DataObject(MesToolboxDragDrop.DataFormat, itemViewModel.Model);
DragDrop.DoDragDrop(listBoxItem, dragData, DragDropEffects.Move);
}
}
private void OnListBoxPreviewMouseLeftButtonDown(Object sender, MouseButtonEventArgs e)
{
ListBoxItem listBoxItem = MesVisualTreeUtility.FindParent <ListBoxItem>(
(DependencyObject)e.OriginalSource);
_draggingItem = listBoxItem != null;
_mouseStartPosition = e.GetPosition(ListBox);
}