gpui_base/
event.rs

1use gpui::{
2    App, ClickEvent, InteractiveElement, OngoingScroll, Pixels, Point, Stateful,
3    StatefulInteractiveElement, TouchPhase, Window,
4};
5
6/// gpui delimits scroll gestures with `std::time::Instant`, which is
7/// unimplemented on wasm32: the first wheel event over an axis-locked scroll
8/// area panics with "time not implemented on this platform" and takes the whole
9/// application down, leaving the canvas unresponsive. Losing the axis lock in
10/// the browser is by far the lesser cost, so the locks below are no-ops there.
11pub trait OngoingScrollExt {
12    /// Locks a wheel delta to the axis its gesture started on, where the
13    /// platform supports it.
14    fn lock_axis(&mut self, delta: &mut Point<Pixels>, touch_phase: TouchPhase);
15}
16
17impl OngoingScrollExt for OngoingScroll {
18    fn lock_axis(&mut self, delta: &mut Point<Pixels>, touch_phase: TouchPhase) {
19        #[cfg(target_family = "wasm")]
20        let _ = (delta, touch_phase);
21        #[cfg(not(target_family = "wasm"))]
22        self.filter(delta, touch_phase);
23    }
24}
25
26pub trait InteractiveElementExt: InteractiveElement {
27    /// Locks scrolling to the gesture's dominant axis, where the platform
28    /// supports it. See [`OngoingScrollExt`] for why this is a no-op on wasm32.
29    fn lock_scroll_axis(self) -> Self
30    where
31        Self: Sized + StatefulInteractiveElement,
32    {
33        #[cfg(target_family = "wasm")]
34        {
35            self
36        }
37        #[cfg(not(target_family = "wasm"))]
38        {
39            self.restrict_scroll_to_axis()
40        }
41    }
42
43    /// Set the listener for a double click event.
44    fn on_double_click(
45        mut self,
46        listener: impl Fn(&ClickEvent, &mut Window, &mut App) + 'static,
47    ) -> Self
48    where
49        Self: Sized,
50    {
51        self.interactivity().on_click(move |event, window, cx| {
52            if event.click_count() == 2 {
53                listener(event, window, cx);
54            }
55        });
56        self
57    }
58}
59
60impl<E: InteractiveElement> InteractiveElementExt for Stateful<E> {}
gpui_base/event.rs

gpui_base/
event.rs
