public CreatureStructureEditorCanvasVM(CreatureVM creature, ToolCollectionVM toolCollectionVM)
        {
            HistoryStack = new HistoryStackVM <CreatureStructureEditorCanvasVM>(this);
            HistoryStack.PropertyChanged += (o, e) => Reset();
            Creature = creature;
            CameraVM = new CameraVM {
                OffsetX = -CanvasWidth / 2, OffsetY = -CanvasHeight / 2
            };
            ToolCollectionVM = toolCollectionVM;

            CanvasSizeChangedCommand = new DelegateHandleCommand <SizeChange>(CanvasSizeChanged, o => true);
            CanvasMouseDownCommand   =
                new DelegateHandleCommand <MouseInfo>(mouseInfo =>
                                                      ToolCollectionVM.SelectedTool?.OnCanvasMouseDown(mouseInfo,
                                                                                                       this,
                                                                                                       Keyboard.Modifiers) ==
                                                      true,
                                                      o => true);
            CanvasMouseUpCommand =
                new DelegateHandleCommand <MouseInfo>(mouseInfo =>
                                                      ToolCollectionVM.SelectedTool?.OnCanvasMouseUp(mouseInfo,
                                                                                                     this,
                                                                                                     Keyboard.Modifiers) ==
                                                      true,
                                                      o => true);
            CanvasMouseMoveCommand =
                new DelegateHandleCommand <MouseInfo>(mouseInfo =>
                                                      ToolCollectionVM.SelectedTool?.OnCanvasMouseMove(mouseInfo,
                                                                                                       this,
                                                                                                       Keyboard.Modifiers) ==
                                                      true,
                                                      o => true);
            CanvasMouseWheelCommand = new DelegateHandleCommand <MouseWheelInfo>(mouseWheelInfo =>
                                                                                 ToolCollectionVM
                                                                                 .SelectedTool?.OnCanvasMouseWheel(mouseWheelInfo,
                                                                                                                   this,
                                                                                                                   Keyboard
                                                                                                                   .Modifiers) ==
                                                                                 true,
                                                                                 o => true);
            CanvasMouseEnterCommand =
                new DelegateCommand(o => ToolCollectionVM.SelectedTool?.OnCanvasMouseEnter(this, Keyboard.Modifiers), o => true);
            CanvasMouseLeaveCommand =
                new DelegateCommand(o => ToolCollectionVM.SelectedTool?.OnCanvasMouseLeave(this, Keyboard.Modifiers), o => true);
        }
 private bool CanvasSizeChanged(SizeChange sizeChange)
 {
     CameraVM.UpdateBoundaries();
     return(true);
 }