feat: add OnPushed and OnPopped methods for view stack management

Author: BlenMiner

Assets/PurrUI/Runtime/MonoView.cs

@@ -20,6 +20,11 @@ public class MonoView : MonoBehaviour
 
         public Canvas canvas { get; private set; }
 
+        public virtual void OnPushed() { }
+
+        public virtual void OnPopped() { }
+
+
         public void Initialize(ViewStack parentStack)
         {
             this.parentStack = parentStack;

Assets/PurrUI/Runtime/ViewStack.cs

@@ -119,6 +119,7 @@ public MonoView Push(MonoView prefab)
             _stack.Add(instance);
             instance.Initialize(this);
             instance.UpdateOrder(idx + _orderOffset);
+            instance.OnPushed();
 
             var transition = instance.EnterTransition();
             if (transition != null)
@@ -254,6 +255,7 @@ public T Push<T>() where T : MonoView
             _stack.Add(instance);
             instance.Initialize(this);
             instance.UpdateOrder(idx + _orderOffset);
+            instance.OnPushed();
 
             var transition = instance.EnterTransition();
             if (transition != null)
@@ -284,6 +286,7 @@ public void Pop()
 
             var topView = _stack[^1];
             _stack.RemoveAt(_stack.Count - 1);
+            topView.OnPopped();
 
             var transition = topView.ExitTransition();
             if (transition != null)
@@ -339,6 +342,7 @@ public void Pop(MonoView instance)
             }
 
             _stack.RemoveAt(idx);
+            instance.OnPopped();
 
             var transition = instance.ExitTransition();
             if (transition != null)