子程序使用优化

UIShare/PubEvent/SubProgramNavigateEvent.cs

@@ -0,0 +1,34 @@
+using Prism.Events;
+using UIShare.UIViewModel;
+
+namespace UIShare.PubEvent
+{
+    /// <summary>
+    /// 子程序导航事件：运行时进入/退出子程序时发布，
+    /// StepsManagerViewModel 订阅后自动切换显示。
+    /// </summary>
+    public class SubProgramNavigateEvent : PubSubEvent<SubProgramNavigatePayload>
+    {
+    }
+
+    public class SubProgramNavigatePayload
+    {
+        /// <summary>目标台架的作用域标识</summary>
+        public string Scope { get; set; } = "";
+
+        /// <summary>Enter = 进入子程序，Exit = 退出回到上一级</summary>
+        public NavigateAction Action { get; set; }
+
+        /// <summary>进入时：子程序的 ProgramVM；退出时可为 null</summary>
+        public ProgramVM? SubProgram { get; set; }
+
+        /// <summary>子程序步骤的名称（用于面包屑显示）</summary>
+        public string? StepName { get; set; }
+    }
+
+    public enum NavigateAction
+    {
+        Enter,
+        Exit
+    }
+}