add switch

crates/core/tests/switch.rs

@@ -0,0 +1,111 @@
+use std::{cell::RefCell, rc::Rc};
+
+use gpui::{
+    AnyWindowHandle, AppContext as _, Context, IntoElement, KeyDownEvent, KeyUpEvent, Keystroke,
+    Modifiers, ParentElement as _, Render, Styled as _, TestAppContext, VisualTestContext, Window,
+    div, point, px,
+};
+use gpui_native_core::switch::Switch;
+use gpui_native_theme::Theme;
+
+struct Harness {
+    changes: Rc<RefCell<Vec<bool>>>,
+    checked: bool,
+    disabled: bool,
+}
+
+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().flex().flex_col().child(
+            Switch::new("test-switch")
+                .label("Wi-Fi")
+                .checked(self.checked)
+                .disabled(self.disabled)
+                .on_change(move |next, _, cx| {
+                    changes.borrow_mut().push(next);
+                    view.update(cx, |harness, cx| {
+                        harness.checked = next;
+                        cx.notify();
+                    });
+                }),
+        )
+    }
+}
+
+/// A maximized window whose switch track sits in the top-left corner, so
+/// `point(px(10.), px(10.))` lands on it.
+fn switch_window(
+    checked: bool,
+    disabled: bool,
+) -> (VisualTestContext, AnyWindowHandle, Rc<RefCell<Vec<bool>>>) {
+    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 {
+        changes: harness_changes,
+        checked,
+        disabled,
+    });
+    let window = window.into();
+    cx.update_window(window, |_, window, cx| {
+        window.draw(cx).clear(cx);
+    })
+    .unwrap();
+    (VisualTestContext::from_window(window, &cx), window, changes)
+}
+
+fn draw(cx: &mut VisualTestContext, window: AnyWindowHandle) {
+    cx.update_window(window, |_, window, cx| {
+        window.draw(cx).clear(cx);
+    })
+    .unwrap();
+}
+
+#[test]
+fn clicking_reports_the_next_value_through_the_controlled_loop() {
+    let (mut cx, _window, changes) = switch_window(false, false);
+    cx.simulate_click(point(px(10.), px(10.)), Modifiers::default());
+    assert_eq!(*changes.borrow(), vec![true]);
+
+    // The second click must report `false`: only if the owner applied the
+    // first change does the switch know it is now checked.
+    cx.simulate_click(point(px(10.), px(10.)), Modifiers::default());
+    assert_eq!(*changes.borrow(), vec![true, false]);
+}
+
+#[test]
+fn disabled_switch_does_not_report_changes() {
+    let (mut cx, _window, changes) = switch_window(false, true);
+    cx.simulate_click(point(px(10.), px(10.)), Modifiers::default());
+    assert!(changes.borrow().is_empty());
+}
+
+#[test]
+fn enter_and_space_report_the_next_value_while_focused() {
+    let (mut cx, window, changes) = switch_window(false, false);
+    cx.simulate_click(point(px(10.), px(10.)), Modifiers::default());
+    assert_eq!(
+        *changes.borrow(),
+        vec![true],
+        "the pointer click itself toggles"
+    );
+
+    // Repaint with the switch focused so its Enter/Space handlers register.
+    draw(&mut cx, window);
+
+    for key in ["enter", "space"] {
+        cx.simulate_event(KeyDownEvent {
+            keystroke: Keystroke::parse(key).unwrap(),
+            is_held: false,
+            prefer_character_input: false,
+        });
+        cx.simulate_event(KeyUpEvent {
+            keystroke: Keystroke::parse(key).unwrap(),
+        });
+    }
+
+    assert_eq!(*changes.borrow(), vec![true, false, true]);
+}