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#![cfg_attr(target_family = "wasm", no_main)]
use std::time::Duration;
use anyhow::Result;
use gpui::{
Animation, AnimationExt as _, AnimationPhase, App, AssetSource, Bounds, Context, MouseButton,
MouseDownEvent, MouseMoveEvent, Pixels, SharedString, SpringAnimation, SpringConfig,
Transformation, Window, WindowBounds, WindowOptions, bounce, div, ease_in_out, percentage,
prelude::*, px, relative, rgba, size, svg,
};
use gpui_platform::application;
struct Assets {}
impl AssetSource for Assets {
fn load(&self, path: &str) -> Result<Option<std::borrow::Cow<'static, [u8]>>> {
std::fs::read(path)
.map(Into::into)
.map_err(Into::into)
.map(Some)
}
fn list(&self, path: &str) -> Result<Vec<SharedString>> {
Ok(std::fs::read_dir(path)?
.filter_map(|entry| {
Some(SharedString::from(
entry.ok()?.path().to_string_lossy().into_owned(),
))
})
.collect::<Vec<_>>())
}
}
const ARROW_CIRCLE_SVG: &str = concat!(
env!("CARGO_MANIFEST_DIR"),
"/examples/image/arrow_circle.svg"
);
struct AnimationExample {
spring_phase: u8,
spring_damping: f32,
spring_damping_drag: Option<(Pixels, f32)>,
}
impl Render for AnimationExample {
fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
const MINIMUM_DAMPING: f32 = 2.0;
const MAXIMUM_DAMPING: f32 = 32.0;
const DAMPING_SLIDER_WIDTH: Pixels = px(224.0);
let spring_phase = self.spring_phase;
let spring_position = px(98.0 * f32::from(spring_phase));
let spring_damping = self.spring_damping;
let spring = SpringConfig::new(170.0, spring_damping, 1.0);
let (_, damping_ratio) = spring.canonical();
let damping_fraction =
(spring_damping - MINIMUM_DAMPING) / (MAXIMUM_DAMPING - MINIMUM_DAMPING);
div()
.flex()
.flex_col()
.size_full()
.bg(gpui::white())
.text_color(gpui::black())
.justify_around()
.child(
div()
.flex()
.flex_col()
.size_full()
.justify_around()
.child(
div()
.id("content")
.flex()
.flex_col()
.h(px(150.))
.overflow_y_scroll()
.w_full()
.flex_1()
.justify_center()
.items_center()
.text_xl()
.gap_4()
.child("Hello Animation")
.child(
div()
.id("spring-demo")
.flex()
.flex_col()
.gap_2()
.p_2()
.w(px(240.0))
.rounded_md()
.bg(rgba(0x00000010))
.cursor_pointer()
.on_mouse_down(
MouseButton::Left,
cx.listener(|this, _, _, cx| {
this.spring_phase = (this.spring_phase + 1) % 3;
cx.notify();
}),
)
.child(format!(
"Target phase {spring_phase}: click rapidly to redirect momentum"
))
.child(
div()
.id("spring-damping-controls")
.flex()
.flex_col()
.gap_1()
.text_sm()
.on_click(|_, _, cx| cx.stop_propagation())
.child(format!(
"Drag damping: {spring_damping:.1} (ζ {damping_ratio:.2})"
))
.child(
div()
.id("spring-damping")
.relative()
.h(px(20.0))
.w(DAMPING_SLIDER_WIDTH)
.cursor_pointer()
.on_mouse_down(
MouseButton::Left,
cx.listener(
|this,
event: &MouseDownEvent,
_,
cx| {
this.spring_damping_drag = Some((
event.position.x,
this.spring_damping,
));
cx.stop_propagation();
},
),
)
.on_mouse_move(cx.listener(
|this,
event: &MouseMoveEvent,
_,
cx| {
let Some((
start_position,
start_damping,
)) = this.spring_damping_drag
else {
return;
};
let delta = (event.position.x
- start_position)
/ DAMPING_SLIDER_WIDTH;
this.spring_damping = (start_damping
+ delta
* (MAXIMUM_DAMPING
- MINIMUM_DAMPING))
.clamp(
MINIMUM_DAMPING,
MAXIMUM_DAMPING,
);
cx.stop_propagation();
cx.notify();
},
))
.on_mouse_up(
MouseButton::Left,
cx.listener(|this, _, _, cx| {
this.spring_damping_drag = None;
cx.stop_propagation();
}),
)
.on_mouse_up_out(
MouseButton::Left,
cx.listener(|this, _, _, cx| {
this.spring_damping_drag = None;
cx.stop_propagation();
}),
)
.child(
div()
.absolute()
.top(px(8.0))
.h(px(4.0))
.w_full()
.rounded_full()
.bg(rgba(0x00000030)),
)
.child(
div()
.absolute()
.top(px(8.0))
.h(px(4.0))
.w(relative(damping_fraction))
.rounded_full()
.bg(rgba(0x3b82f6ff)),
)
.child(
div()
.absolute()
.top(px(3.0))
.left(relative(damping_fraction))
.ml(px(-7.0))
.size(px(14.0))
.rounded_full()
.bg(rgba(0x2563ebff)),
),
),
)
.child(
div().relative().h(px(32.0)).w_full().child(
div()
.absolute()
.top_1()
.size(px(24.0))
.rounded_full()
.bg(rgba(0x3b82f6ff))
.cursor_pointer()
.debug_selector(|| "spring-position".into())
.with_spring(
"spring-position",
SpringAnimation::new(spring)
.to(spring_position)
.with_epsilon(0.25),
|this, left| this.left(left),
),
),
)
.child(
div().h(px(24.0)).rounded_sm().with_spring(
"spring-phase",
SpringAnimation::new(spring)
.to(AnimationPhase(f32::from(spring_phase)))
.with_epsilon(0.001),
|this, phase| {
let (width, color) = if phase.0 <= 1.0 {
(
phase.interpolate_between(
0.0..=1.0,
px(48.0),
px(224.0),
),
phase.interpolate_between_clamped(
0.0..=1.0,
rgba(0xf97316ff),
rgba(0x22c55eff),
),
)
} else {
(
phase.interpolate_between(
1.0..=2.0,
px(224.0),
px(96.0),
),
phase.interpolate_between_clamped(
1.0..=2.0,
rgba(0x22c55eff),
rgba(0xa855f7ff),
),
)
};
this.w(width).bg(color)
},
),
),
)
.child(
svg()
.size_20()
.overflow_hidden()
.path(ARROW_CIRCLE_SVG)
.text_color(gpui::black())
.with_animation(
"image_circle",
Animation::new(Duration::from_secs(2))
.repeat()
.with_easing(bounce(ease_in_out)),
|svg, delta| {
svg.with_transformation(Transformation::rotate(
percentage(delta),
))
},
),
),
)
.child(
div()
.flex()
.h(px(64.))
.w_full()
.p_2()
.justify_center()
.items_center()
.border_t_1()
.border_color(gpui::black().opacity(0.1))
.bg(gpui::black().opacity(0.05))
.child("Other Panel"),
),
)
}
}
fn run_example() {
application().with_assets(Assets {}).run(|cx: &mut App| {
let options = WindowOptions {
window_bounds: Some(WindowBounds::Windowed(Bounds::centered(
None,
size(px(300.), px(300.)),
cx,
))),
..Default::default()
};
cx.open_window(options, |_, cx| {
cx.activate(false);
cx.new(|_| AnimationExample {
spring_phase: 0,
spring_damping: 14.0,
spring_damping_drag: None,
})
})
.unwrap();
});
}
#[cfg(not(target_family = "wasm"))]
fn main() {
run_example();
}
#[cfg(target_family = "wasm")]
#[wasm_bindgen::prelude::wasm_bindgen(start)]
pub fn start() {
gpui_platform::web_init();
run_example();
}
#[cfg(all(test, feature = "test-support"))]
mod tests {
use gpui::{Modifiers, TestAppContext};
use super::*;
#[gpui::test]
fn clicking_spring_position_changes_the_target(cx: &mut TestAppContext) {
let (view, cx) = cx.add_window_view(|_, _| AnimationExample {
spring_phase: 0,
spring_damping: 14.0,
spring_damping_drag: None,
});
cx.simulate_resize(size(px(300.0), px(300.0)));
cx.run_until_parked();
let position_bounds = cx
.debug_bounds("spring-position")
.expect("spring position should be rendered");
let position = position_bounds.center();
cx.simulate_mouse_move(position, None, Modifiers::default());
cx.simulate_click(position, Modifiers::default());
cx.run_until_parked();
assert_eq!(cx.update(|_, cx| view.read(cx).spring_phase), 1);
}
}