private void DisplayList_PreviewMouseMove(object sender, MouseEventArgs e)
{
//if the left mouse button is not pressed, then we can't be dragging anything
if (e.LeftButton != MouseButtonState.Pressed || !(sender is ListBox) || (_clickedGame == null))
{
return;
}
var mousePos = e.GetPosition(null);
var diff = _startPoint - mousePos;
//If we travel far enough, begin the drag
if (Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance || Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance)
{
_clickedGame = null;
foreach (object selItem in _selItems)
{
if (!DisplayList.SelectedItems.Contains(selItem))
{
DisplayList.SelectedItems.Add(selItem);
}
}
//The sender is always the list box
var listBox = (ListBox)sender;
var items = listBox.SelectedItems.OfType <RemoteSteamApp>().ToArray();
FriendTransfer transferData = new FriendTransfer((FriendViewModel)listBox.DataContext, items);
DataObject dragData = new DataObject(DRAG_DATA_NAME, transferData);
DragDrop.DoDragDrop(this, dragData, DragDropEffects.Move);
}
}
private void DisplayList_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
_startPoint = e.GetPosition(null);
_clickedGame = FindAncestor <ListBoxItem>((DependencyObject)e.OriginalSource)?.DataContext as RemoteSteamApp;
if (_selItems.Any() && ((Keyboard.Modifiers & (ModifierKeys.Control | ModifierKeys.Shift)) == 0))
{
if (!_selItems.Contains(_clickedGame))
{
_selItems.Clear();
}
}
}
private void DisplayList_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
_clickedGame = null;
_selItems.Clear();
_selItems.AddRange(DisplayList.SelectedItems.Cast <object>());
}
public FriendTransfer(FriendViewModel list, RemoteSteamApp item)
{
SourceLibrary = list;
SourceGame = item;
}
