Add fast select buttons

PamhagenSysCtrl/Helpers/Pipeline/Graph.cs

@@ -54,6 +54,14 @@ namespace PamhagenSysCtrl.Helpers.Pipeline {
             return p;
         }
 
+        public Path? GetFreePath(IEnumerable<INode> points, bool overrideStart = false) {
+            if (overrideStart) {
+                return GetPath(points, (n) => n is not ISink && (n is not Valve v || !v.LockedForPaths.Any(p => p.Start != points.First())));
+            } else {
+                return GetPath(points, (n) => n is not ISink && (n is not Valve v || !v.IsLocked));
+            }
+        }
+
         public Path? GetPath(IEnumerable<INode> points, Func<INode, bool>? valid = null) {
             if (points.Count() < 2) return null;
             var start = points.First();

PamhagenSysCtrl/Helpers/Pipeline/Valve.cs

@@ -14,7 +14,9 @@ namespace PamhagenSysCtrl.Helpers.Pipeline {
         public string Label => $"V{Nr}";
         public Brush? Highlight { get; set; }
 
-        public bool IsLocked { get; set; }
+        public readonly ISet<Path> LockedForPaths = new HashSet<Path>();
+
+        public bool IsLocked => LockedForPaths.Any();
         public bool IsOpen => CallbackIsOpen();
         public bool WantOpen => CallbackWantOpen(this);
         public ISet<IEdge> Inputs { get; init; }