+#include <cassert>
+
+#include "rowitem.hpp"
+#include "rowitemowner.hpp"
+
+using std::max;
+using std::make_pair;
+using std::min;
+using std::pair;
+using std::shared_ptr;
+using std::vector;
+
+namespace pv {
+namespace view {
+
+vector< shared_ptr<RowItem> >& RowItemOwner::child_items()
+{
+ return items_;
+}
+
+const vector< shared_ptr<RowItem> >& RowItemOwner::child_items() const
+{
+ return items_;
+}
+
+void RowItemOwner::clear_child_items()
+{
+ for (auto &i : items_) {
+ assert(i->owner() == this);
+ i->set_owner(nullptr);
+ }
+ items_.clear();
+}
+
+void RowItemOwner::add_child_item(std::shared_ptr<RowItem> item)
+{
+ assert(!item->owner());
+ item->set_owner(this);
+ items_.push_back(item);
+
+ extents_changed(true, true);
+}
+
+void RowItemOwner::remove_child_item(std::shared_ptr<RowItem> item)
+{
+ assert(item->owner() == this);
+ item->set_owner(nullptr);
+ auto iter = std::find(items_.begin(), items_.end(), item);
+ assert(iter != items_.end());
+ items_.erase(iter);
+
+ extents_changed(true, true);
+}
+
+RowItemOwner::iterator RowItemOwner::begin()
+{
+ return iterator(this, items_.begin());
+}
+
+RowItemOwner::iterator RowItemOwner::end()
+{
+ return iterator(this);
+}
+
+RowItemOwner::const_iterator RowItemOwner::begin() const
+{
+ return const_iterator(this, items_.cbegin());
+}
+
+RowItemOwner::const_iterator RowItemOwner::end() const
+{
+ return const_iterator(this);
+}
+
+pair<int, int> RowItemOwner::v_extents() const
+{
+ pair<int, int> extents(INT_MAX, INT_MIN);
+
+ for (const shared_ptr<RowItem> r : child_items()) {
+ assert(r);
+ if (!r->enabled())
+ continue;
+
+ const int child_offset = r->layout_v_offset();
+ const pair<int, int> child_extents = r->v_extents();
+ extents.first = min(child_extents.first + child_offset,
+ extents.first);
+ extents.second = max(child_extents.second + child_offset,
+ extents.second);
+ }
+
+ return extents;
+}
+
+void RowItemOwner::restack_items()
+{
+}
+
+} // view
+} // pv