public LayerListGroupViewModel(IEventAggregator eventAggregator, IAmeSession session, IActionHandler handler, LayerGroup layer)
{
this.eventAggregator = eventAggregator ?? throw new ArgumentNullException("eventAggregator");
this.session = session ?? throw new ArgumentNullException("session is null");
this.layer = layer ?? throw new ArgumentNullException("layer");
this.actionHandler = handler ?? throw new ArgumentNullException("handler is null");
this.LayerNodes = new ObservableCollection <ILayerListNodeViewModel>();
this.isDragging = false;
DrawingGroup drawingGroup = new DrawingGroup();
DrawingGroup filled = new DrawingGroup();
using (DrawingContext context = filled.Open())
{
Rect drawingRect = new Rect(0, 0, layer.GetPixelWidth(), layer.GetPixelHeight());
context.DrawRectangle(Brushes.Transparent, new Pen(Brushes.Transparent, 0), drawingRect);
}
drawingGroup.Children.Add(filled);
drawingGroup.Children.Add(layer.Group);
this.layerPreview = new DrawingImage(drawingGroup);
this.layer.Layers.CollectionChanged += LayersChanged;
this.EditTextboxCommand = new DelegateCommand(() => EditTextbox());
this.StopEditingTextboxCommand = new DelegateCommand(() => StopEditingTextbox());
this.MouseLeftButtonDownCommand = new DelegateCommand <object>((point) => HandleLeftClickDown((MouseEventArgs)point));
this.MouseMoveCommand = new DelegateCommand <object>((point) => HandleMouseMove((MouseEventArgs)point));
this.DropCommand = new DelegateCommand <object>((point) => HandleDropCommand((DragEventArgs)point));
this.DragOverCommand = new DelegateCommand <object>((args) => HandleDragOverCommand((DragEventArgs)args));
this.DragEnterCommand = new DelegateCommand <object>((args) => HandleDragEnterCommand((DragEventArgs)args));
this.DragLeaveCommand = new DelegateCommand <object>((args) => HandleDragLeaveCommand((DragEventArgs)args));
}