From 8350e01c1eef7366c5fb97fa9b1cde4861619644 Mon Sep 17 00:00:00 2001
From: Dongsug Song <dongsug.song@samsung.com>
Date: Mon, 5 Oct 2020 19:38:58 +0900
Subject: [PATCH] [NUI] Add defensive code for ViewSignal Disconnect()

---
 src/Tizen.NUI/src/internal/ViewSignal.cs           | 23 +++++++++++++++++++---
 .../src/public/BaseComponents/ViewEvent.cs         |  5 +++++
 .../src/public/BaseComponents/ViewInternal.cs      |  5 +++++
 3 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/src/Tizen.NUI/src/internal/ViewSignal.cs b/src/Tizen.NUI/src/internal/ViewSignal.cs
index c1de491..377377e 100755
--- a/src/Tizen.NUI/src/internal/ViewSignal.cs
+++ b/src/Tizen.NUI/src/internal/ViewSignal.cs
@@ -14,6 +14,8 @@
  * limitations under the License.
  *
  */
+
+using global::System.Threading;
 using Tizen.NUI.BaseComponents;
 
 namespace Tizen.NUI
@@ -56,10 +58,25 @@ namespace Tizen.NUI
 
         public void Disconnect(System.Delegate func)
         {
-            System.IntPtr ip = System.Runtime.InteropServices.Marshal.GetFunctionPointerForDelegate<System.Delegate>(func);
+            try
             {
-                Interop.ActorSignal.ActorSignal_Disconnect(swigCPtr, new System.Runtime.InteropServices.HandleRef(this, ip));
-                if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
+                System.IntPtr ip = System.Runtime.InteropServices.Marshal.GetFunctionPointerForDelegate<System.Delegate>(func);
+                {
+                    Interop.ActorSignal.ActorSignal_Disconnect(swigCPtr, new System.Runtime.InteropServices.HandleRef(this, ip));
+                    if (NDalicPINVOKE.SWIGPendingException.Pending) throw NDalicPINVOKE.SWIGPendingException.Retrieve();
+                }
+            }
+            catch (global::System.Exception ex)
+            {
+                Tizen.Log.Fatal("NUI", $"[ERROR] excpetion! {ex}: {ex.Message}");
+                Tizen.Log.Fatal("NUI", $"[ERROR] current threadID : {Thread.CurrentThread.ManagedThreadId}");
+                Tizen.Log.Fatal("NUI", $"[ERROR] back trace!");
+                global::System.Diagnostics.StackTrace st = new global::System.Diagnostics.StackTrace(true);
+                for (int i = 0; i < st.FrameCount; i++)
+                {
+                    global::System.Diagnostics.StackFrame sf = st.GetFrame(i);
+                    Tizen.Log.Fatal("NUI", " Method " + sf.GetMethod());
+                }
             }
         }
 
diff --git a/src/Tizen.NUI/src/public/BaseComponents/ViewEvent.cs b/src/Tizen.NUI/src/public/BaseComponents/ViewEvent.cs
index c4e380e..626c7f8 100755
--- a/src/Tizen.NUI/src/public/BaseComponents/ViewEvent.cs
+++ b/src/Tizen.NUI/src/public/BaseComponents/ViewEvent.cs
@@ -215,6 +215,7 @@ namespace Tizen.NUI.BaseComponents
                 if (_onRelayoutEventHandler == null && OnRelayoutSignal().Empty() == false)
                 {
                     this.OnRelayoutSignal().Disconnect(_onRelayoutEventCallback);
+                    _onRelayoutEventCallback = null;
                 }
 
             }
@@ -387,6 +388,7 @@ namespace Tizen.NUI.BaseComponents
                 if (_onWindowEventHandler == null && OnWindowSignal().Empty() == false)
                 {
                     this.OnWindowSignal().Disconnect(_onWindowEventCallback);
+                    _onWindowEventCallback = null;
                 }
             }
         }
@@ -416,6 +418,7 @@ namespace Tizen.NUI.BaseComponents
                 if (_offWindowEventHandler == null && OffWindowSignal().Empty() == false)
                 {
                     this.OffWindowSignal().Disconnect(_offWindowEventCallback);
+                    _offWindowEventCallback = null;
                 }
             }
         }
@@ -503,6 +506,7 @@ namespace Tizen.NUI.BaseComponents
                 if (_resourcesLoadedEventHandler == null && ResourcesLoadedSignal().Empty() == false)
                 {
                     this.ResourcesLoadedSignal().Disconnect(_ResourcesLoadedCallback);
+                    _ResourcesLoadedCallback = null;
                 }
             }
         }
@@ -558,6 +562,7 @@ namespace Tizen.NUI.BaseComponents
                 if (_backgroundResourceLoadedEventHandler == null && ResourcesLoadedSignal().Empty() == false)
                 {
                     this.ResourcesLoadedSignal().Disconnect(_backgroundResourceLoadedCallback);
+                    _backgroundResourceLoadedCallback = null;
                 }
             }
         }
diff --git a/src/Tizen.NUI/src/public/BaseComponents/ViewInternal.cs b/src/Tizen.NUI/src/public/BaseComponents/ViewInternal.cs
index 9df4a23..08f2c0e 100755
--- a/src/Tizen.NUI/src/public/BaseComponents/ViewInternal.cs
+++ b/src/Tizen.NUI/src/public/BaseComponents/ViewInternal.cs
@@ -1147,16 +1147,19 @@ namespace Tizen.NUI.BaseComponents
             if (_onRelayoutEventCallback != null)
             {
                 this.OnRelayoutSignal().Disconnect(_onRelayoutEventCallback);
+                _onRelayoutEventCallback = null;
             }
 
             if (_offWindowEventCallback != null)
             {
                 this.OffWindowSignal().Disconnect(_offWindowEventCallback);
+                _offWindowEventCallback = null;
             }
 
             if (_onWindowEventCallback != null)
             {
                 this.OnWindowSignal().Disconnect(_onWindowEventCallback);
+                _onWindowEventCallback = null;
             }
 
             if (_wheelEventCallback != null)
@@ -1187,6 +1190,7 @@ namespace Tizen.NUI.BaseComponents
             if (_ResourcesLoadedCallback != null)
             {
                 this.ResourcesLoadedSignal().Disconnect(_ResourcesLoadedCallback);
+                _ResourcesLoadedCallback = null;
             }
 
             if (_keyCallback != null)
@@ -1207,6 +1211,7 @@ namespace Tizen.NUI.BaseComponents
             if (_backgroundResourceLoadedCallback != null)
             {
                 this.ResourcesLoadedSignal().Disconnect(_backgroundResourceLoadedCallback);
+                _backgroundResourceLoadedCallback = null;
             }
 
             if (_onWindowSendEventCallback != null)
-- 
2.7.4