Clean things up before solving the move problem.

gui/dnd_loot.cpp

@@ -62,8 +62,9 @@ namespace gui {
         END(CLOSE);
         break;
       case LOOT_SELECT:
-        commit_move($loot_ui.$gui, $grab_source, data);
+        if(commit_move($loot_ui.$gui, $grab_source, data)) {
           state(DNDState::LOOTING);
+        }
         break;
       case INV_SELECT:
         if(commit_drop($loot_ui.$gui,
@@ -92,9 +93,9 @@ namespace gui {
         }
         break;
       case INV_SELECT:
-        // BUG: should I do a bool here and not transition?
-        commit_move($status_ui.$gui, $grab_source, data);
+        if(commit_move($status_ui.$gui, $grab_source, data)) {
           state(DNDState::LOOTING);
+        }
         break;
       default:
          handle_mouse(ev, $status_ui.$gui);
@@ -111,8 +112,9 @@ namespace gui {
           END(CLOSE);
         } break;
       case INV_SELECT:
-        commit_move($status_ui.$gui, $grab_source, data);
+        if(commit_move($status_ui.$gui, $grab_source, data)) {
           END(CLOSE);
+        }
         break;
       default:
          handle_mouse(ev, $status_ui.$gui);
@@ -228,8 +230,8 @@ namespace gui {
     dbc::check(source.has<guecs::GrabSource>(*source_id),
         "gui does not have a GrabSource at that slot");
 
-    auto& drop = target.get<guecs::DropTarget>(target_id);
     auto& grab = source.get<guecs::GrabSource>(*source_id);
+    auto& drop = target.get<guecs::DropTarget>(target_id);
 
     if(drop.commit(grab.world_entity)) {
       grab.commit();
@@ -240,8 +242,9 @@ namespace gui {
     }
   }
 
-  void DNDLoot::commit_move(guecs::UI& gui, std::optional<guecs::Entity> source_id, std::any data) {
+  bool DNDLoot::commit_move(guecs::UI& gui, std::optional<guecs::Entity> source_id, std::any data) {
     dbc::check(source_id != std::nullopt, "source_id must exist");
+
     auto& grab = gui.get<guecs::GrabSource>(*source_id);
     grab.commit();
 
@@ -250,13 +253,11 @@ namespace gui {
 
     if(drop.commit(grab.world_entity)) {
       clear_grab();
+      return true;
     } else {
-      dbc::log("commit drop didn't happen");
+      // swap with the target instead
+      return false;
     }
-
-    // BUG: if the drop fails then need to put the grab back?
-    // How to confirm the drop will work before doing it?
-    // Or, maybe save the commit?
   }
 
   bool DNDLoot::hold_world_item() {

gui/dnd_loot.hpp

@@ -49,7 +49,7 @@ namespace gui {
       bool commit_drop(guecs::UI& source, guecs::UI& target,
           std::optional<guecs::Entity> source_id, std::any data);
 
-      void commit_move(guecs::UI& gui,
+      bool commit_move(guecs::UI& gui,
           std::optional<guecs::Entity> source_id, std::any data);
 
       bool hold_world_item();

gui/loot_ui.cpp

@@ -131,5 +131,4 @@ namespace gui {
     return $gui.mouse(x, y, hover);
   }
 
-
 }

gui/status_ui.cpp

@@ -104,8 +104,6 @@ namespace gui {
     auto& slot_name = $slot_to_name.at(gui_id);
     auto& inventory = $level.world->get_the<inventory::Model>();
 
-    inventory.dump();
-
     if(inventory.add(slot_name, world_entity)) {
       $level.world->make_constant(world_entity);
       update();