make navtarget equatable and avoid routing to same target

Author: fx-lange

NavTarget.cs

@@ -1,6 +1,8 @@
+using System;
+
 namespace Plugins.Router
 {
-    public class NavTarget
+    public class NavTarget : IEquatable<NavTarget>
     {
         public string Name;
         public Params Params;
@@ -12,10 +14,42 @@ public static implicit operator NavTarget(string name)
                 Name = name
             };
         }
-    }
+        
+        public bool Equals(NavTarget other)
+        {
+            if (ReferenceEquals(null, other)) return false;
+            if (ReferenceEquals(this, other)) return true;
+            return Name == other.Name && Equals(Params, other.Params);
+        }
 
-    public class NavState : NavTarget
-    {
-        public Route Route;
+        public override bool Equals(object obj)
+        {
+            if (ReferenceEquals(null, obj)) return false;
+            if (ReferenceEquals(this, obj)) return true;
+            if (obj.GetType() != this.GetType()) return false;
+            return Equals((NavTarget)obj);
+        }
+
+
+        public static bool operator ==(NavTarget lhs, NavTarget rhs)
+        {
+            if (lhs is null)
+            {
+                if (rhs is null)
+                {
+                    return true;
+                }
+
+                return false;
+            }
+            return lhs.Equals(rhs);
+        }
+
+        public static bool operator !=(NavTarget lhs, NavTarget rhs) => !(lhs == rhs);
+
+        public override int GetHashCode()
+        {
+            return HashCode.Combine(Name, Params);
+        }
     }
 }

Router.cs

@@ -83,7 +83,7 @@ public void BeforeEach(Func<NavTarget, NavTarget, NavTarget> beforeEach)
         public async Task<bool> Push(string name, Params @params = null)
         {
             var target = await DoRoute(name, @params);
-            if (target == null)
+            if (target == null || target == _currTarget)
             {
                 return false;
             }
@@ -98,11 +98,11 @@ public async Task<bool> Push(string name, Params @params = null)
 
         public async Task<bool> Back()
         {
-            if (_history.Count <= 1)
+            if (_history.Count <= 0)
             {
                 return false;
             }
-            
+
             _history.Pop();
 
             var target = _history.Peek();