private void ConnectVisuals()
{
if (SelectedShapes == null || SelectedShapes.Count() != 2)
{
return;
}
AddConnection(SelectedShapes.First(), SelectedShapes.Last());
}
public MainWindowVM(INavigationService navigationService = null)
{
this.navigationService = navigationService ?? Locator.CurrentMutable.GetService <INavigationService>();
Visuals = new ReactiveList <IVisual>
{
ChangeTrackingEnabled = true
};
SelectedVisuals = new ReactiveList <IVisual>
{
ChangeTrackingEnabled = true
};
shapes = Visuals.CountChanged.Select(_ => Visuals.Where(x => x is IShape).Cast <IShape>()).ToProperty(this, x => x.Shapes);
connections = Visuals.CountChanged.Select(_ => Visuals.Where(x => x is IConnection).Cast <IConnection>()).ToProperty(this, x => x.Connections);
selectedShapes = SelectedVisuals.CountChanged.Select(_ => SelectedVisuals.Where(x => x is IShape).Cast <IShape>()).ToProperty(this, x => x.SelectedShapes);
selectedConnections = SelectedVisuals.CountChanged.Select(_ => SelectedVisuals.Where(x => x is IConnection).Cast <IConnection>()).ToProperty(this, x => x.SelectedConnections);
var shp1 = AddCircle();
var shp2 = AddTriangle();
var shp3 = AddSquare();
AddConnection(shp1, shp2);
AddConnection(shp2, shp3);
AddCircleCommand = ReactiveCommand.Create(AddCircle);
//Only allow Squares when there are at least 2 Circles
var canCreateSquares = Visuals
.Changed
.ToUnit()
.Select(_ => Visuals.Count(m => m is CircleVM) >= 2);
AddSquareCommand = ReactiveCommand.Create(AddSquare, canCreateSquares);
//Limit Triangles to Number of Squares / 2
var canCreateTriangles = Visuals
.Changed
.ToUnit()
.Select(_ => Visuals.Count(m => m is TriangleVM) < Visuals.Count(m => m is SquareVM) / 2)
.StartWith(false);
AddTriangleCommand = ReactiveCommand.Create(AddTriangle, canCreateTriangles);
var oneSelected = SelectedVisuals.CountChanged.Select(c => c == 1);
EditCommand = ReactiveCommand.Create <IVisual>(x => EditVisual(x), oneSelected);
//Some commands only make sense when something is selected
var anythingSelected = SelectedVisuals.CountChanged.Select(c => c > 0);
DeselectAllCommand = ReactiveCommand.Create(DeselectAll, anythingSelected);
RotateSelectedCommand = ReactiveCommand.Create(RotateSelected, anythingSelected);
DuplicateSelectedCommand = ReactiveCommand.Create(DuplicateSelected, anythingSelected);
DeleteSelectedCommand = ReactiveCommand.Create(DeleteSelected, anythingSelected);
ToggleSpawnerCommand = ReactiveCommand.Create(ToggleSpawner);
var canConnect = SelectedVisuals.CountChanged.Select(_ => SelectedShapes != null && SelectedShapes.Count() == 2).StartWith(false);
ConnectCommand = ReactiveCommand.Create(ConnectVisuals, canConnect);
//When one item is moved manually move all the other selected movables too
Visuals.ItemChanged
.Where(x => x.Sender is IShape && (x.Sender as IShape).IsMoving)
.Select(x => new { Sender = x.Sender as IShape, Pos = new Point(x.Sender.Left, x.Sender.Top) })
.Buffer(2, 1)
.Where(x => x[0].Sender == x[1].Sender)
.Subscribe(x => MovableMoved(x[0].Sender, x[0].Pos, x[1].Pos));
}
