From dfb780a544ea1131b63f3cbac49dd6eaa0f9e8f2 Mon Sep 17 00:00:00 2001
From: Marco Arnulfo <marcoarnulfo1@gmail.com>
Date: Mon, 12 Oct 2026 15:56:22 +0200
Subject: [PATCH] UI: clicking a column or row header in point mode inserts N:N
 / n:n (#691)

---
 crates/ui-egui/src/grid.rs                    | 16 ++++
 crates/ui-egui/tests/formula_point_headers.rs | 75 +++++++++++++++++++
 2 files changed, 91 insertions(+)
 create mode 100644 crates/ui-egui/tests/formula_point_headers.rs

diff --git a/crates/ui-egui/src/grid.rs b/crates/ui-egui/src/grid.rs
index d0eef85..5f4583c 100644
--- a/crates/ui-egui/src/grid.rs
+++ b/crates/ui-egui/src/grid.rs
@@ -1770,6 +1770,9 @@ fn interact(app: &mut SheetApp, ui: &mut egui::Ui, resp: &egui::Response, geo: &
                 return;
             }
             let c = geo.col_at(sh, p.x);
+            if point_header(app, wb, sh, RangeRef::cols(c, c)) {
+                return;
+            }
             if resp.drag_started()
                 && !mods.any()
                 && sel.ranges.len() == 1
@@ -1790,6 +1793,9 @@ fn interact(app: &mut SheetApp, ui: &mut egui::Ui, resp: &egui::Response, geo: &
                 return;
             }
             let r = geo.row_at(sh, p.y);
+            if point_header(app, wb, sh, RangeRef::rows(r, r)) {
+                return;
+            }
             let range = if mods.shift { RangeRef::rows(sel.anchor.row.min(r), sel.anchor.row.max(r)) } else { RangeRef::rows(r, r) };
             select_ranges(app, range, mods.command, CellRef::new(r, geo.col_at(sh, geo.cells.left() + 1.0)));
             app.grid.drag = Drag::Rows(if mods.shift { sel.anchor.row } else { r });
@@ -2097,6 +2103,16 @@ fn interact(app: &mut SheetApp, ui: &mut egui::Ui, resp: &egui::Response, geo: &
     keyboard(app, &ctx, resp, geo, sh);
 }
 
+/// Point mode on a header: inserts the whole-column or whole-row reference instead of selecting.
+fn point_header(app: &mut SheetApp, wb: &Workbook, sh: &Sheet, range: RangeRef) -> bool {
+    let Some(ed) = app.editor.as_mut().filter(|ed| ed.can_point()) else { return false };
+    let r = range.a1();
+    let r = if ed.sheet != wb.active_sheet { format!("{}!{r}", gridcraft_engine::formula::quote_sheet(&sh.name)) } else { r };
+    ed.insert_ref(&r);
+    ed.request_focus = true;
+    true
+}
+
 fn select_to_pointer(app: &mut SheetApp, geo: &Geo, sh: &Sheet, wb: &Workbook, p: Pos2) {
     let cell = CellRef::new(
         geo.row_at(sh, p.y.clamp(geo.cells.top() + 1.0, geo.cells.bottom() - 1.0)),
diff --git a/crates/ui-egui/tests/formula_point_headers.rs b/crates/ui-egui/tests/formula_point_headers.rs
new file mode 100644
index 0000000..4313fb9
--- /dev/null
+++ b/crates/ui-egui/tests/formula_point_headers.rs
@@ -0,0 +1,75 @@
+//! Point mode on the headers: while a formula waits for a reference, a header click inserts a
+//! whole-column or whole-row reference, driven through real egui pointer events.
+
+use egui::{Event, Modifiers, PointerButton, Pos2, pos2, vec2};
+use gridcraft_engine::Session;
+use gridcraft_ui_egui::{SheetApp, grid::Geo};
+use serde_json::json;
+
+fn harness() -> egui_kittest::Harness<'static, SheetApp> {
+    let mut session = Session::new();
+    session.new_workbook();
+    session.execute("selection.set", json!({"range": "F8"})).unwrap();
+    let mut h = egui_kittest::Harness::builder().with_step_dt(1.0 / 60.0).with_size(vec2(1200.0, 800.0)).build_ui_state(
+        |ui, app: &mut SheetApp| {
+            app.logic(ui.ctx());
+            app.ui(ui);
+        },
+        SheetApp::new(session, Default::default()),
+    );
+    h.run_steps(4);
+    h.state_mut().begin_edit(Some("=SUM(".into()), false);
+    h.run_steps(2);
+    h
+}
+
+fn header_center(h: &egui_kittest::Harness<'_, SheetApp>, rows: bool, index: u32) -> Pos2 {
+    let app = h.state();
+    let sheet = app.session.active().unwrap().wb.active().unwrap();
+    let geo = Geo::new(sheet, app.grid.rect.unwrap(), app.view().scroll);
+    if rows {
+        pos2(geo.rect.left() + geo.header_w * 0.5, geo.y(sheet, index) + sheet.row_height(index) * geo.z * 0.5)
+    } else {
+        pos2(geo.x(sheet, index) + sheet.col_width(index) * geo.z * 0.5, geo.rect.top() + geo.header_h * 0.5)
+    }
+}
+
+fn click(h: &mut egui_kittest::Harness<'_, SheetApp>, pos: Pos2) {
+    for pressed in [true, false] {
+        h.input_mut()
+            .events
+            .extend([Event::PointerMoved(pos), Event::PointerButton { pos, button: PointerButton::Primary, pressed, modifiers: Modifiers::NONE }]);
+        h.step();
+    }
+    h.run_steps(2);
+}
+
+#[test]
+fn column_header_click_inserts_a_column_reference() {
+    let mut h = harness();
+    let at = header_center(&h, false, 2);
+    click(&mut h, at);
+    let app = h.state();
+    assert_eq!(app.editor.as_ref().map(|e| e.text.as_str()), Some("=SUM(C:C"));
+    assert_eq!(app.session.active().unwrap().selection.current().a1(), "F8");
+}
+
+#[test]
+fn row_header_click_inserts_a_row_reference() {
+    let mut h = harness();
+    let at = header_center(&h, true, 3);
+    click(&mut h, at);
+    let app = h.state();
+    assert_eq!(app.editor.as_ref().map(|e| e.text.as_str()), Some("=SUM(4:4"));
+    assert_eq!(app.session.active().unwrap().selection.current().a1(), "F8");
+}
+
+#[test]
+fn a_second_header_click_replaces_the_pointed_reference() {
+    let mut h = harness();
+    let first = header_center(&h, false, 2);
+    click(&mut h, first);
+    let second = header_center(&h, false, 4);
+    click(&mut h, second);
+    assert_eq!(h.state().editor.as_ref().map(|e| e.text.as_str()), Some("=SUM(E:E"));
+}