adds comments

src/grid.rs

@@ -36,13 +36,11 @@ impl CellWidget {
     fn new(pos: CellPosition, header_text: &str) -> Self {
         let cell_src = include_str!("../res/cell.glade");
         let builder = gtk::Builder::new_from_string(cell_src);
-
-        // Set up reactivity on buttons
+        // Retrieve children
         let eventbox: gtk::EventBox =
             builder
                 .get_object("cell")
                 .unwrap();
-
         let header: gtk::Label =
             builder
                 .get_object("header")
@@ -53,34 +51,35 @@ impl CellWidget {
                 .get_object("position")
                 .unwrap();
         position.set_text(&format!("{}x{}", pos.0, pos.1));
-
-        // Drag-and-drop capacity
         let desc_btn: gtk::Button =
             builder
                 .get_object("desc_btn")
                 .unwrap();
         desc_btn.set_visible(false);
-        // The data to be send
-        let targets = vec![
-            gtk::TargetEntry::new("text/plain", gtk::TargetFlags::SAME_APP, 0)
-        ];
-        eventbox.drag_source_set(
-            gdk::ModifierType::MODIFIER_MASK,
-            &targets,
-            gdk::DragAction::MOVE,
-        );
         let cell = CellWidget {
             eventbox,
             position,
             header,
-            desc_btn
+            desc_btn,
         };
-
+        // Drag-and-drop capacity
+        // The data to be sent
+        let targets = vec![
+            gtk::TargetEntry::new("text/plain", gtk::TargetFlags::SAME_APP, 0)
+        ];
+        // Acting as source
+        cell.eventbox.drag_source_set(
+            gdk::ModifierType::MODIFIER_MASK,
+            &targets,
+            gdk::DragAction::MOVE,
+        );
         let h = cell.header.clone();
         // Send data to the drop site
         cell.eventbox.connect_drag_data_get(
             move |_,_,data,info,time| {
                 println!("Send...");
+                // TODO: Refactoring, this is the inverse of 'placing',
+                //       building a PawnData instead of destructuring it.
                 if let Some(to_send) = h.get_text() {
                     data.set_text(&to_send);
                 }
@@ -94,7 +93,7 @@ impl CellWidget {
                 Self::set_content(&c, None);
             }
         );
-
+        // Acting as destination
         cell.eventbox.drag_dest_set(
             gtk::DestDefaults::ALL,
             &targets,