define the diff bindings for TimelineController

- set the name field
- manage a nested collection of markers

All based on boilerplate code copied from my diff binding tests

src/gui/timeline/clip-presenter.hpp

@@ -93,11 +93,11 @@ namespace timeline {
      ~ClipPresenter();
       
       
-    private:/* ===== Internals ===== */
-      
       /** set up a binding to respond to mutation messages via UiBus */
       virtual void buildMutator (lib::diff::TreeMutator::Handle)  override;
-   
+      
+      
+    private:/* ===== Internals ===== */
     };
   
   

src/gui/timeline/marker-widget.hpp

@@ -69,11 +69,10 @@ namespace timeline {
      ~MarkerWidget();
       
       
-    private:/* ===== Internals ===== */
-      
       /** set up a binding to respond to mutation messages via UiBus */
       virtual void buildMutator (lib::diff::TreeMutator::Handle)  override;
-   
+      
+    private:/* ===== Internals ===== */
     };
   
   

src/gui/timeline/timeline-controller.cpp

@@ -56,6 +56,8 @@
 
 //using util::_Fmt;
 using lib::diff::TreeMutator;
+using lib::diff::collection;
+using std::make_unique;
 //using std::shared_ptr;
 //using std::weak_ptr;
 //using util::contains;
@@ -80,6 +82,7 @@ namespace timeline {
     : Controller{identity, nexus}
     , markers_{}
     , fork_{new TrackPresenter{trackID, nexus}}
+    , name_{identity.getSym()}              // fallback initialise name from human-readable ID symbol 
     {
       UNIMPLEMENTED ("how to make the controller operative...");
     }
@@ -93,57 +96,38 @@ namespace timeline {
   void
   TimelineController::buildMutator (TreeMutator::Handle buffer)
   {
-#if false /////////////////////////////////////////////////////////////////////////////////////////////////////////////UNIMPLEMENTED :: TICKET #1039
-    using Attrib = std::pair<const string,string>;
-    using lib::diff::collection;
+    using PMarker = unique_ptr<MarkerWidget>;
     
     buffer.create (
       TreeMutator::build()
-        .attach (collection(scope)
+        .attach (collection(markers_)
                .isApplicableIf ([&](GenNode const& spec) -> bool
                   {
                     return spec.data.isNested();                  // »Selector« : require object-like sub scope
                   })
-               .matchElement ([&](GenNode const& spec, PMockElm const& elm) -> bool
+               .matchElement ([&](GenNode const& spec, PMarker const& elm) -> bool
                   {
-                    return spec.idi == elm->getID();
+                    return spec.idi == ID(elm);
                   })
-               .constructFrom ([&](GenNode const& spec) -> PMockElm
+               .constructFrom ([&](GenNode const& spec) -> PMarker
                   {
-                    PMockElm child = std::make_unique<MockElm>(spec.idi, this->uiBus_);
-                    return child;
+                    return make_unique<MarkerWidget>(spec.idi, this->uiBus_);
                   })
-               .buildChildMutator ([&](PMockElm& target, GenNode::ID const& subID, TreeMutator::Handle buff) -> bool
+               .buildChildMutator ([&](PMarker& target, GenNode::ID const& subID, TreeMutator::Handle buff) -> bool
                   {
-                    if (target->getID() != subID) return false;   //require match on already existing child object
+                    if (ID(target) != subID) return false;         //require match on already existing child object
                     target->buildMutator (buff);                  // delegate to child to build nested TreeMutator
                     return true;
                   }))
-        .attach (collection(attrib)
-               .isApplicableIf ([&](GenNode const& spec) -> bool
-                  {
-                    return spec.isNamed()                         // »Selector« : accept attribute-like values
-                       and not spec.data.isNested();              //              but no nested objects
-                  })
-               .matchElement ([&](GenNode const& spec, Attrib const& elm) -> bool
-                  {
-                    return elm.first == spec.idi.getSym();
-                  })
-               .constructFrom ([&](GenNode const& spec) -> Attrib
-                  {
-                    string key{spec.idi.getSym()},
-                           val{render(spec.data)};
-                    return {key, val};
-                  })
-               .assignElement ([&](Attrib& target, GenNode const& spec) -> bool
-                  {
-                    string key{spec.idi.getSym()},
-                           newVal{render (spec.data)};
-                    target.second = newVal;
-                    return true;
-                  })));
-#endif    /////////////////////////////////////////////////////////////////////////////////////////////////////////////UNIMPLEMENTED :: TICKET #1039
-    UNIMPLEMENTED ("diff mutation binding for the TimelineController");
+        .change("name", [&](string val)
+            {
+              name_ = val;
+            })
+        .mutateAttrib("fork", [&](TreeMutator::Handle buff)
+            {
+              REQUIRE (fork_);
+              fork_->buildMutator(buff);
+            }));
   }
   
   

src/gui/timeline/timeline-controller.hpp

@@ -87,6 +87,8 @@ namespace timeline {
       vector<unique_ptr<MarkerWidget>> markers_;
       std::unique_ptr<TrackPresenter>  fork_;
       
+      string name_;
+      
     public:
       /**
        * @param identity used to refer to a corresponding timeline element in the Session
@@ -98,6 +100,9 @@ namespace timeline {
      ~TimelineController();  
       
       
+      /** set up a binding to respond to mutation messages via UiBus */
+      virtual void buildMutator (lib::diff::TreeMutator::Handle)  override;
+      
       
     public: /* ===== Control interface ===== */
       
@@ -106,10 +111,6 @@ namespace timeline {
     private:/* ===== Events ===== */
       
     private:/* ===== Internals ===== */
-      
-      /** set up a binding to respond to mutation messages via UiBus */
-      virtual void buildMutator (lib::diff::TreeMutator::Handle)  override;
-   
     };
   
   

src/gui/timeline/track-presenter.hpp

@@ -91,11 +91,11 @@ namespace timeline {
      ~TrackPresenter();
       
       
-    private:/* ===== Internals ===== */
-      
       /** set up a binding to respond to mutation messages via UiBus */
       virtual void buildMutator (lib::diff::TreeMutator::Handle)  override;
-   
+      
+      
+    private:/* ===== Internals ===== */
     };