add button

crates/core/tests/button.rs

@@ -0,0 +1,89 @@
+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::button::Button;
+use gpui_native_theme::Theme;
+
+struct Harness {
+    clicks: Rc<RefCell<usize>>,
+    disabled: bool,
+}
+
+impl Render for Harness {
+    fn render(&mut self, _window: &mut Window, _cx: &mut Context<Self>) -> impl IntoElement {
+        let clicks = self.clicks.clone();
+        div().size_full().flex().flex_col().child(
+            Button::new("test-button")
+                .label("Save")
+                .disabled(self.disabled)
+                .on_click(move |_, _, _| *clicks.borrow_mut() += 1),
+        )
+    }
+}
+
+/// A maximized window whose button stretches across the top 28px, so
+/// `point(px(60.), px(14.))` always lands on it.
+fn button_window(disabled: bool) -> (VisualTestContext, AnyWindowHandle, Rc<RefCell<usize>>) {
+    let mut cx = TestAppContext::single();
+    cx.update(Theme::init);
+    let clicks = Rc::new(RefCell::new(0));
+    let harness_clicks = clicks.clone();
+    let window = cx.add_window(move |_, _| Harness {
+        clicks: harness_clicks,
+        disabled,
+    });
+    let window = window.into();
+    cx.update_window(window, |_, window, cx| {
+        window.draw(cx).clear(cx);
+    })
+    .unwrap();
+    (VisualTestContext::from_window(window, &cx), window, clicks)
+}
+
+fn draw(cx: &mut VisualTestContext, window: AnyWindowHandle) {
+    cx.update_window(window, |_, window, cx| {
+        window.draw(cx).clear(cx);
+    })
+    .unwrap();
+}
+
+#[test]
+fn pointer_click_fires_on_click() {
+    let (mut cx, _window, clicks) = button_window(false);
+    cx.simulate_click(point(px(60.), px(14.)), Modifiers::default());
+    assert_eq!(*clicks.borrow(), 1);
+}
+
+#[test]
+fn disabled_button_ignores_clicks() {
+    let (mut cx, _window, clicks) = button_window(true);
+    cx.simulate_click(point(px(60.), px(14.)), Modifiers::default());
+    assert_eq!(*clicks.borrow(), 0);
+}
+
+#[test]
+fn enter_and_space_fire_on_click_while_focused() {
+    let (mut cx, window, clicks) = button_window(false);
+    cx.simulate_click(point(px(60.), px(14.)), Modifiers::default());
+    assert_eq!(*clicks.borrow(), 1, "the pointer click itself activates");
+
+    // Repaint with the button 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!(*clicks.borrow(), 3, "Enter and Space each fire on_click");
+}