- /* does nothing useful if layering mode is later=higher */
- switch (_session.config.get_layer_model()) {
- case LaterHigher:
- return;
- default:
- break;
- }
-
- if (region->layer() == 0) {
- /* already on the bottom */
- return;
- }
-
- move_region_to_layer (0, region, -1);
- /* force region's last layer op to zero so that it stays at the bottom
- when doing future relayers
- */
- region->set_last_layer_op (0);
-}
-
-int
-Playlist::move_region_to_layer (layer_t target_layer, boost::shared_ptr<Region> region, int dir)
-{
- RegionList::iterator i;
- typedef pair<boost::shared_ptr<Region>,layer_t> LayerInfo;
- list<LayerInfo> layerinfo;
-
- {
- RegionLock rlock (const_cast<Playlist *> (this));
-
- for (i = regions.begin(); i != regions.end(); ++i) {
-
- if (region == *i) {
- continue;
- }
-
- layer_t dest;
-
- if (dir > 0) {
-
- /* region is moving up, move all regions on intermediate layers
- down 1
- */
-
- if ((*i)->layer() > region->layer() && (*i)->layer() <= target_layer) {
- dest = (*i)->layer() - 1;
- } else {
- /* not affected */
- continue;
- }
- } else {
-
- /* region is moving down, move all regions on intermediate layers
- up 1
- */
-
- if ((*i)->layer() < region->layer() && (*i)->layer() >= target_layer) {
- dest = (*i)->layer() + 1;
- } else {
- /* not affected */
- continue;
- }
- }
-
- LayerInfo newpair;
-
- newpair.first = *i;
- newpair.second = dest;
-
- layerinfo.push_back (newpair);
- }
- }
-
- freeze ();
-
- /* now reset the layers without holding the region lock */
-
- for (list<LayerInfo>::iterator x = layerinfo.begin(); x != layerinfo.end(); ++x) {
- x->first->set_layer (x->second);
- }
-
- region->set_layer (target_layer);
-
- /* now check all dependents, since we changed the layering */
-
- for (list<LayerInfo>::iterator x = layerinfo.begin(); x != layerinfo.end(); ++x) {
- check_dependents (x->first, false);
- }
-
- check_dependents (region, false);
- notify_layering_changed ();
-
- thaw ();
-
- return 0;