More work on drawing: interruptions work now halfway.

1 files changed, 57 insertions, 0 deletions

diff --git a/dw/iterator.cc b/dw/iterator.cc
index dbb779f6..92a028d0 100644
--- a/dw/iterator.cc
+++ b/dw/iterator.cc
@@ -898,5 +898,62 @@ void CharIterator::unhighlight (CharIterator *it1, CharIterator *it2,
    }
 }
 
+// ---------------------------
+//    StackingIteratorStack
+// ---------------------------
+
+StackingIteratorStack::StackingIteratorStack ()
+{
+   vector = new lout::container::untyped::Vector (1, true);
+   topPos = -1;
+}
+
+StackingIteratorStack::~StackingIteratorStack ()
+{
+   delete vector;
+}
+
+void StackingIteratorStack::intoStringBuffer(lout::misc::StringBuffer *sb)
+{
+   sb->append ("[ ");
+
+   for (int i = 0; i < vector->size (); i++) {
+      if (i != 0)
+         sb->append (" ");
+      if (i == topPos)
+         sb->append ("<b>");
+      vector->get(i)->intoStringBuffer (sb);
+      if (i == topPos)
+         sb->append ("</b>");
+   }
+
+   sb->append (" ]");
+}
+
+void StackingIteratorStack::push (lout::object::Object *object)
+{
+   assert (atRealTop ());
+   vector->put (object);
+   topPos++;
+}
+
+void StackingIteratorStack::pop ()
+{
+   assert (atRealTop ());
+   vector->remove (vector->size () - 1);
+   topPos--;
+}
+
+void StackingIteratorStack::forward ()
+{
+   assert (!atRealTop ());
+   topPos++;
+}
+
+void StackingIteratorStack::backward ()
+{
+   topPos--;
+}
+
 } // namespace core
 } // namespace dw