add sidebar

crates/data/tests/sidebar.rs

@@ -0,0 +1,119 @@
+use std::{cell::RefCell, rc::Rc};
+
+use gpui::{
+    Context, IntoElement, Modifiers, MouseButton, ParentElement as _, Render, Styled as _,
+    TestAppContext, VisualTestContext, Window, div, point, px,
+};
+use gpui_native_data::sidebar::{Sidebar, SidebarEntry};
+use gpui_native_theme::Theme;
+
+type Changes = Rc<RefCell<Vec<Option<usize>>>>;
+
+struct Harness {
+    selected: Option<usize>,
+    changes: Changes,
+}
+
+impl Render for Harness {
+    fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        let changes = self.changes.clone();
+        let view = cx.entity();
+        div().size_full().child(
+            Sidebar::new("test-sidebar")
+                .selected(self.selected)
+                .on_change(move |next, _, cx| {
+                    changes.borrow_mut().push(next);
+                    view.update(cx, |harness, cx| {
+                        harness.selected = next;
+                        cx.notify();
+                    });
+                })
+                .entries(|_, _| {
+                    vec![
+                        SidebarEntry::header("Favorites"),          // 0: never selectable
+                        SidebarEntry::row("Documents"),             // 1
+                        SidebarEntry::row("Locked").disabled(true), // 2
+                        SidebarEntry::header("Locations"),          // 3: never selectable
+                        SidebarEntry::row("Trash"),                 // 4
+                    ]
+                }),
+        )
+    }
+}
+
+/// Entries stack from the top-left: the header band (~32 px) then ~34 px row
+/// bands, so clicks at `(50, 16)` hit the header, `(50, 48)` Documents,
+/// `(50, 82)` Locked, `(50, 116)` the second header, `(50, 150)` Trash.
+fn sidebar_window() -> (TestAppContext, VisualTestContext, Changes) {
+    let mut cx = TestAppContext::single();
+    cx.update(Theme::init);
+    let changes = Rc::new(RefCell::new(Vec::new()));
+    let harness_changes = changes.clone();
+    let window = cx.add_window(move |_, _| Harness {
+        selected: None,
+        changes: harness_changes,
+    });
+    let mut visual = VisualTestContext::from_window(window.into(), &cx);
+    visual.update(|window, cx| {
+        window.draw(cx).clear(cx);
+    });
+    (cx, visual, changes)
+}
+
+fn draw(visual: &mut VisualTestContext) {
+    visual.update(|window, cx| {
+        window.draw(cx).clear(cx);
+    });
+}
+
+fn click(visual: &mut VisualTestContext, position: gpui::Point<gpui::Pixels>) {
+    visual.simulate_mouse_down(position, MouseButton::Left, Modifiers::default());
+    visual.simulate_mouse_up(position, MouseButton::Left, Modifiers::default());
+}
+
+#[test]
+fn clicking_a_row_selects_it_and_hands_the_sidebar_the_keyboard() {
+    let (_cx, mut visual, changes) = sidebar_window();
+
+    // The header band is not a row: clicking it reports nothing.
+    click(&mut visual, point(px(50.), px(16.)));
+    draw(&mut visual);
+    assert!(changes.borrow().is_empty());
+
+    click(&mut visual, point(px(50.), px(48.)));
+    assert_eq!(*changes.borrow(), vec![Some(1)]);
+
+    // The click focused the sidebar; the arrows move from here.
+    visual.simulate_keystrokes("down");
+    draw(&mut visual);
+    assert_eq!(*changes.borrow(), vec![Some(1), Some(4)]);
+}
+
+#[test]
+fn clicking_a_disabled_row_reports_nothing() {
+    let (_cx, mut visual, changes) = sidebar_window();
+
+    click(&mut visual, point(px(50.), px(82.)));
+    draw(&mut visual);
+    assert!(changes.borrow().is_empty());
+}
+
+#[test]
+fn keyboard_navigation_skips_headers_disabled_rows_and_never_wraps() {
+    let (_cx, mut visual, changes) = sidebar_window();
+
+    click(&mut visual, point(px(50.), px(48.))); // Documents, focuses
+    visual.simulate_keystrokes("down"); // over Locked → Trash
+    visual.simulate_keystrokes("down"); // over the second header; no wrap
+    draw(&mut visual);
+    assert_eq!(*changes.borrow(), vec![Some(1), Some(4)]);
+
+    visual.simulate_keystrokes("up"); // over Locked → Documents
+    visual.simulate_keystrokes("end"); // last selectable row
+    visual.simulate_keystrokes("home"); // first selectable row
+    draw(&mut visual);
+    assert_eq!(
+        *changes.borrow(),
+        vec![Some(1), Some(4), Some(1), Some(4), Some(1)]
+    );
+}