/// <summary>
/// Selects or deselects the <paramref name="item"/> (depends on whether the item was already
/// selected and whether Shift or Control keys are pressed).
/// </summary>
/// <param name="item">clicked item</param>
/// <param name="e">event arguments</param>
public override void SelectableItemPreviewMouseDown(ISelectable item, MouseButtonEventArgs e)
{
base.SelectableItemPreviewMouseDown(item, e);
//Selection handling
if ((Keyboard.Modifiers & (ModifierKeys.Shift | ModifierKeys.Control)) != ModifierKeys.None)
{
if (item.IsSelected)
{
item = SelectedItemsCollection.GetOwner(item);
item.IsSelected = false;
Canvas.SelectedItems.Remove(item);
}
else
{
item.IsSelected = true;
Canvas.SelectedItems.Add(item);
}
}
else if (!item.IsSelected)
{
Canvas.SelectedItems.SetSelection(item);
//foreach (ISelectable i in Canvas.SelectedItems)
// i.IsSelected = false;
//Canvas.SelectedItems.Clear();
//item.IsSelected = true;
//Canvas.SelectedItems.Add(item);
}
}
/// <summary>
/// Creates new instance of XCaseCanvas
/// </summary>
public XCaseCanvas()
{
selectedItems = new SelectedItemsCollection();
normalState = new NormalState(this);
draggingElementState = new DraggingElementState(this);
draggingConnectionState = new DraggingConnectionState(this);
State = ECanvasState.Normal;
#if DEBUG
MouseLabel = new Label();
this.Children.Add(MouseLabel);
#endif
InitializeContextMenu();
}