/// <summary>
/// コンストラクタ
/// </summary>
public MainWindowViewModel()
{
this.SetRectAdditionModeCommand = new DelegateCommand(
SetRectAdditionMode, () => true);
this.RemoveRectCommand = new DelegateCommand(
appContext.UIData.RemoveRect, () => ElementCollection.Any(e => e.IsSelected));
this.SelectRectCommand = new DelegateCommand <PlaceableElement>(
SelectRect, (obj) => true);
this.DeselectAllRectCommand = new DelegateCommand(
DeselectAllRect, () => true);
this.AddElementEvent = new AddElementEventHandler(appContext.UIData.AddRect);
this.GridSize = 10;
this.IsRectAdditionMode = false;
}