Add notification to parents for parameterChanged when ofParameter<void> gets triggered. (openframeworks#6471)

Author: eduardfrigola

libs/openFrameworks/types/ofParameter.cpp

@@ -106,10 +106,50 @@ ofParameter<void>& ofParameter<void>::set(const std::string & name){
 
 void ofParameter<void>::trigger(){
 	ofNotifyEvent(obj->changedE,this);
+    // Notify all parents, if there are any.
+    if(!obj->parents.empty())
+    {
+        // Erase each invalid parent
+        obj->parents.erase(std::remove_if(obj->parents.begin(),
+                                          obj->parents.end(),
+                                          [this](const std::weak_ptr<ofParameterGroup::Value> & p){ return p.expired(); }),
+                           obj->parents.end());
+        
+        // notify all leftover (valid) parents of this object's changed value.
+        // this can't happen in the same iterator as above, because a notified listener
+        // might perform similar cleanups that would corrupt our iterator
+        // (which appens for example if the listener calls getFirstParent on us)
+        for(auto & parent: obj->parents){
+            auto p = parent.lock();
+            if(p){
+                p->notifyParameterChanged(*this);
+            }
+        }
+    }
 }
 
 void ofParameter<void>::trigger(const void * sender){
 	ofNotifyEvent(obj->changedE,sender);
+    // Notify all parents, if there are any.
+    if(!obj->parents.empty())
+    {
+        // Erase each invalid parent
+        obj->parents.erase(std::remove_if(obj->parents.begin(),
+                                          obj->parents.end(),
+                                          [this](const std::weak_ptr<ofParameterGroup::Value> & p){ return p.expired(); }),
+                           obj->parents.end());
+        
+        // notify all leftover (valid) parents of this object's changed value.
+        // this can't happen in the same iterator as above, because a notified listener
+        // might perform similar cleanups that would corrupt our iterator
+        // (which appens for example if the listener calls getFirstParent on us)
+        for(auto & parent: obj->parents){
+            auto p = parent.lock();
+            if(p){
+                p->notifyParameterChanged(*this);
+            }
+        }
+    }
 }
 
 void ofParameter<void>::enableEvents(){