Queue semantics

Author: dcwhite

src/Interface/Application/ProvenanceWindow.cc

@@ -125,8 +125,16 @@ void ProvenanceWindow::addProvenanceItem(ProvenanceItemHandle item)
   for (int i = provenanceListWidget_->count() - 1; i > lastUndoRow_; --i)
     delete provenanceListWidget_->takeItem(i);
 
+  if (provenanceListWidget_->count() == maxItems_)
+  {
+    delete provenanceListWidget_->takeItem(0);
+  }
+  else
+  {
+    lastUndoRow_++;
+  }
+
   new ProvenanceWindowListItem(item, provenanceListWidget_);
-  lastUndoRow_++;
   setRedoEnabled(false);
   setUndoEnabled(true);
 
@@ -156,6 +164,7 @@ void ProvenanceWindow::clear()
 
 void ProvenanceWindow::setMaxItems(int max)
 {
+  maxItems_ = max;
   for (int i = 0; i < provenanceListWidget_->count() - max; ++i)
   {
     delete provenanceListWidget_->takeItem(0);

src/Interface/Application/ProvenanceWindow.h

@@ -67,7 +67,7 @@ private Q_SLOTS:
   void networkModified();
 private:
   SCIRun::Dataflow::Engine::ProvenanceManagerHandle provenanceManager_;
-  int lastUndoRow_;
+  int lastUndoRow_, maxItems_{10};
   const SCIRun::Dataflow::Engine::ProvenanceManagerHandle::element_type::IOType* networkEditor_;
 
   void setUndoEnabled(bool enable);