refactor: extract table selection overlay style

rust/spikes/leptos-tiptap-spike/src/editor_runtime/overlays.rs

@@ -109,6 +109,32 @@ pub(crate) fn table_col_aux_style(anchor: &TableOverlayAnchor, index: usize) ->
     )
 }
 
+pub(crate) fn table_selection_overlay_style(
+    anchor: &TableOverlayAnchor,
+    selection: &TableSelectionOverlayState,
+) -> String {
+    match selection.kind {
+        TableSelectionKind::Row => {
+            let row_height = anchor.height / anchor.rows.max(1) as f64;
+            format!(
+                "left:0;top:{:.1}px;width:{:.1}px;height:{:.1}px;",
+                row_height * selection.index as f64,
+                anchor.width,
+                row_height
+            )
+        }
+        TableSelectionKind::Column => {
+            let col_width = anchor.width / anchor.cols.max(1) as f64;
+            format!(
+                "left:{:.1}px;top:0;width:{:.1}px;height:{:.1}px;",
+                col_width * selection.index as f64,
+                col_width,
+                anchor.height
+            )
+        }
+    }
+}
+
 pub(crate) fn floating_toolbar_anchor_from_selection() -> Option<FloatingToolbarAnchor> {
     let selection = active_editor_text_selection()?;
     let range = selection.get_range_at(0).ok()?;