void Header::on_group()
{
const vector< shared_ptr<TraceTreeItem> > items(
view_.list_by_type<TraceTreeItem>());
vector< shared_ptr<TraceTreeItem> > selected_items(
make_filter_iterator(item_selected, items.begin(), items.end()),
make_filter_iterator(item_selected, items.end(), items.end()));
stable_sort(selected_items.begin(), selected_items.end(),
[](const shared_ptr<TraceTreeItem> &a, const shared_ptr<TraceTreeItem> &b) {
return a->visual_v_offset() < b->visual_v_offset(); });
shared_ptr<TraceGroup> group(new TraceGroup());
shared_ptr<TraceTreeItem> mouse_down_item(
std::dynamic_pointer_cast<TraceTreeItem>(mouse_down_item_));
shared_ptr<TraceTreeItem> focus_item(
mouse_down_item ? mouse_down_item : selected_items.front());
assert(focus_item);
assert(focus_item->owner());
focus_item->owner()->add_child_item(group);
// Set the group v_offset here before reparenting
group->force_to_v_offset(focus_item->layout_v_offset() +
focus_item->v_extents().first);
for (size_t i = 0; i < selected_items.size(); i++) {
const shared_ptr<TraceTreeItem> &r = selected_items[i];
assert(r->owner());
r->owner()->remove_child_item(r);
group->add_child_item(r);
// Put the items at 1-pixel offsets, so that restack will
// stack them in the right order
r->set_layout_v_offset(i);
}
}
inline filter_iterator<I, P> filter_end(I end, P pr)
{
return make_filter_iterator(end, end, pr);
}
filtered_range(P p, R& r)
: base(make_filter_iterator(pred_t(p),
boost::begin(r), boost::end(r)),
make_filter_iterator(pred_t(p),
boost::end(r), boost::end(r)))
{ }
