151 lines
5.1 KiB
Rust
151 lines
5.1 KiB
Rust
use std::rc::Rc;
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use gpui::{
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Animation, AnimationExt, App, ElementId, FontWeight, InteractiveElement, IntoElement,
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ParentElement, RenderOnce, SharedString, StatefulInteractiveElement, Styled, Window, div,
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prelude::*,
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};
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use crate::{
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motion::{self, Axis, Marker, glide, measure_item, measure_origin, slide},
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theme::{ActiveTheme, TextSize},
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};
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type OnKey = Rc<dyn Fn(&SharedString, &mut Window, &mut App)>;
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/// A document's headings, each level stepping in, beside a rail whose marker glides to the section in view. A press asks the owner to go there; the owner says which is current.
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#[derive(IntoElement)]
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pub struct Outline {
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id: ElementId,
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items: Vec<(SharedString, SharedString, usize)>,
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current: Option<SharedString>,
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on_select: Option<OnKey>,
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}
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impl Outline {
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pub fn new(id: impl Into<ElementId>) -> Self {
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Self {
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id: id.into(),
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items: Vec::new(),
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current: None,
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on_select: None,
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}
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}
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/// A heading under `key`, its title, and its level, counted from one.
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pub fn item(
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mut self,
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key: impl Into<SharedString>,
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title: impl Into<SharedString>,
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level: usize,
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) -> Self {
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assert!(level >= 1, "heading levels start at one");
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self.items.push((key.into(), title.into(), level));
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self
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}
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pub fn current(mut self, key: impl Into<SharedString>) -> Self {
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self.current = Some(key.into());
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self
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}
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pub fn on_select(
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mut self,
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handler: impl Fn(&SharedString, &mut Window, &mut App) + 'static,
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) -> Self {
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self.on_select = Some(Rc::new(handler));
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self
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}
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}
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impl RenderOnce for Outline {
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fn render(self, window: &mut Window, cx: &mut App) -> impl IntoElement {
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let keys: Vec<SharedString> = self.items.iter().map(|(key, _, _)| key.clone()).collect();
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let sliding = self
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.current
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.as_ref()
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.map(|current| slide((self.id.clone(), "slide"), &keys, current, window, cx));
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let duration = motion::duration(motion::SLOW, cx);
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let theme = cx.theme();
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let colors = &theme.colors;
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let marker = sliding
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.as_ref()
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.and_then(|(_, marker)| marker.as_ref())
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.map(
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|Marker {
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from,
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to,
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generation,
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}| {
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let (from, to) = (*from, *to);
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div()
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.absolute()
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.left_0()
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.border_l_2()
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.border_color(colors.accent)
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.with_animation(
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(self.id.clone(), format!("marker-{generation}")),
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Animation::new(duration),
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move |bar, t| {
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let (top, height) = glide(from, to, t);
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bar.top(top).h(height)
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},
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)
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},
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);
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let on_select = self.on_select;
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let rows = self
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.items
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.into_iter()
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.enumerate()
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.map(|(ix, (key, title, level))| {
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let here = self.current.as_ref() == Some(&key);
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let (select, id) = (on_select.clone(), self.id.clone());
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div()
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.id((self.id.clone(), format!("item-{key}")))
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.relative()
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.py_1()
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.pl_3()
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.cursor_pointer()
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.text_color(if here { colors.fg } else { colors.fg_muted })
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.when(here, |row| row.font_weight(FontWeight::MEDIUM))
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.hover(|style| style.text_color(colors.fg))
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.on_click(move |_, window, cx| {
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log::info!("outline {id:?}: {key}");
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if let Some(select) = &select {
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select(&key, window, cx);
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}
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})
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.child(
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div()
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.ml(theme.tree_indent() * (level - 1) as f32)
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.child(title),
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)
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.children(
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sliding
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.as_ref()
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.map(|(state, _)| measure_item(state.clone(), ix, Axis::Vertical)),
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)
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});
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div()
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.relative()
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.text_size(theme.text_size(TextSize::Sm))
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.children(
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sliding
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.as_ref()
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.map(|(state, _)| measure_origin(state.clone(), Axis::Vertical)),
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)
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.child(
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div()
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.absolute()
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.left_0()
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.top_0()
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.bottom_0()
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.border_l_1()
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.border_color(colors.border),
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)
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.children(marker)
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.children(rows)
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}
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}
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