Detect mouse clicks on the board

kifu/kifu-gtk/src/ui/board.rs

@@ -165,7 +165,24 @@ impl ObjectImpl for BoardPrivate {
             });
         }
 
+        let gesture = gtk::GestureClick::new();
+        {
+            let board = self.board.clone();
+            let cursor = self.cursor_location.clone();
+            gesture.connect_released(move |_, _, _, _| {
+                let board = board.borrow();
+                let cursor = cursor.borrow();
+                match board.stone(cursor.row, cursor.column) {
+                    IntersectionElement::Empty(request) => {
+                        println!("need to send request: {:?}", request)
+                    }
+                    _ => {}
+                }
+            });
+        }
+
         self.drawing_area.add_controller(motion_controller);
+        self.drawing_area.add_controller(gesture);
     }
 }
 impl WidgetImpl for BoardPrivate {}