From 413a822a079fb4495d719d3bcd17cb7c5c9c058b Mon Sep 17 00:00:00 2001
From: "Zheng, Lei" <realthunder.dev@gmail.com>
Date: Wed, 23 Oct 2019 07:22:33 +0800
Subject: [PATCH] App: add signalChanged to Property

For more efficient tracking of single property changes
---
 src/App/Property.cpp | 8 +++++++-
 src/App/Property.h   | 5 +++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/App/Property.cpp b/src/App/Property.cpp
index 8f2142fd52..d4571eadd6 100644
--- a/src/App/Property.cpp
+++ b/src/App/Property.cpp
@@ -32,6 +32,7 @@
 #include "ObjectIdentifier.h"
 #include "PropertyContainer.h"
 #include <Base/Exception.h>
+#include <Base/Tools.h>
 #include "Application.h"
 #include "DocumentObject.h"
 
@@ -212,8 +213,13 @@ void Property::setReadOnly(bool readOnly)
 void Property::hasSetValue(void)
 {
     PropertyCleaner guard(this);
-    if (father)
+    if (father) {
         father->onChanged(this);
+        if(!testStatus(Busy)) {
+            Base::BitsetLocker<decltype(StatusBits)> guard(StatusBits,Busy);
+            signalChanged(*this);
+        }
+    }
     StatusBits.set(Touched);
 }
 
diff --git a/src/App/Property.h b/src/App/Property.h
index 7a1cc64944..9a33b6dad8 100644
--- a/src/App/Property.h
+++ b/src/App/Property.h
@@ -31,6 +31,7 @@
 #include <boost/any.hpp>
 #include <string>
 #include <bitset>
+#include <boost/signals2.hpp>
 
 namespace Py {
 class Object;
@@ -75,6 +76,7 @@ public:
                       // relevant for the container using it
         EvalOnRestore = 14, // In case of expression binding, evaluate the
                             // expression on restore and touch the object on value change.
+        Busy = 15, // internal use to avoid recursive signaling
 
         // The following bits are corresponding to PropertyType set when the
         // property added. These types are meant to be static, and cannot be
@@ -269,6 +271,9 @@ private:
 private:
     PropertyContainer *father;
     const char *myName;
+
+public:
+    boost::signals2::signal<void (const App::Property&)> signalChanged;
 };