table: Emit MoveCol when moved column. (#473)

crates/story/src/table_story.rs

@@ -673,6 +673,9 @@ impl TableStory {
             }
             TableEvent::SelectCol(ix) => println!("Select col: {}", ix),
             TableEvent::SelectRow(ix) => println!("Select row: {}", ix),
+            TableEvent::MoveCol(origin_idx, target_idx) => {
+                println!("Move col index: {} -> {}", origin_idx, target_idx);
+            }
         }
     }
 }

crates/ui/src/table.rs

@@ -101,6 +101,7 @@ pub enum TableEvent {
     SelectRow(usize),
     SelectCol(usize),
     ColWidthsChanged(Vec<Option<Pixels>>),
+    MoveCol(usize, usize),
 }
 
 #[derive(Clone, Copy, Default)]
@@ -567,6 +568,7 @@ where
         let col_group = self.col_groups.remove(col_ix);
         self.col_groups.insert(to_ix, col_group);
 
+        cx.emit(TableEvent::MoveCol(col_ix, to_ix));
         cx.notify();
     }