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use std::sync::Arc;
use helix_core::syntax;
use helix_view::graphics::{Margin, Rect, Style};
use tui::buffer::Buffer;
use tui::widgets::{BorderType, Paragraph, Widget, Wrap};
use crate::compositor::{Component, Compositor, Context};
use crate::ui::Markdown;
use super::Popup;
pub struct SignatureHelp {
signature: String,
signature_doc: Option<String>,
/// Part of signature text
active_param_range: Option<(usize, usize)>,
language: String,
config_loader: Arc<syntax::Loader>,
}
impl SignatureHelp {
pub const ID: &'static str = "signature-help";
pub fn new(signature: String, language: String, config_loader: Arc<syntax::Loader>) -> Self {
Self {
signature,
signature_doc: None,
active_param_range: None,
language,
config_loader,
}
}
pub fn set_signature_doc(&mut self, signature_doc: Option<String>) {
self.signature_doc = signature_doc;
}
pub fn set_active_param_range(&mut self, offset: Option<(usize, usize)>) {
self.active_param_range = offset;
}
pub fn visible_popup(compositor: &mut Compositor) -> Option<&mut Popup<Self>> {
compositor.find_id::<Popup<Self>>(Self::ID)
}
}
impl Component for SignatureHelp {
fn render(&mut self, area: Rect, surface: &mut Buffer, cx: &mut Context) {
let margin = Margin::horizontal(1);
let active_param_span = self.active_param_range.map(|(start, end)| {
vec![(
cx.editor
.theme
.find_scope_index_exact("ui.selection")
.unwrap(),
start..end,
)]
});
let sig_text = crate::ui::markdown::highlighted_code_block(
&self.signature,
&self.language,
Some(&cx.editor.theme),
Arc::clone(&self.config_loader),
active_param_span,
);
let (_, sig_text_height) = crate::ui::text::required_size(&sig_text, area.width);
let sig_text_area = area.clip_top(1).with_height(sig_text_height);
let sig_text_area = sig_text_area.inner(&margin).intersection(surface.area);
let sig_text_para = Paragraph::new(sig_text).wrap(Wrap { trim: false });
sig_text_para.render(sig_text_area, surface);
if self.signature_doc.is_none() {
return;
}
let sep_style = Style::default();
let borders = BorderType::line_symbols(BorderType::Plain);
for x in sig_text_area.left()..sig_text_area.right() {
if let Some(cell) = surface.get_mut(x, sig_text_area.bottom()) {
cell.set_symbol(borders.horizontal).set_style(sep_style);
}
}
let sig_doc = match &self.signature_doc {
None => return,
Some(doc) => Markdown::new(doc.clone(), Arc::clone(&self.config_loader)),
};
let sig_doc = sig_doc.parse(Some(&cx.editor.theme));
let sig_doc_area = area.clip_top(sig_text_area.height + 2);
let sig_doc_para = Paragraph::new(sig_doc)
.wrap(Wrap { trim: false })
.scroll((cx.scroll.unwrap_or_default() as u16, 0));
sig_doc_para.render(sig_doc_area.inner(&margin), surface);
}
fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> {
const PADDING: u16 = 2;
const SEPARATOR_HEIGHT: u16 = 1;
if PADDING >= viewport.1 || PADDING >= viewport.0 {
return None;
}
let max_text_width = (viewport.0 - PADDING).min(120);
let signature_text = crate::ui::markdown::highlighted_code_block(
&self.signature,
&self.language,
None,
Arc::clone(&self.config_loader),
None,
);
let (sig_width, sig_height) =
crate::ui::text::required_size(&signature_text, max_text_width);
let (width, height) = match self.signature_doc {
Some(ref doc) => {
let doc_md = Markdown::new(doc.clone(), Arc::clone(&self.config_loader));
let doc_text = doc_md.parse(None);
let (doc_width, doc_height) =
crate::ui::text::required_size(&doc_text, max_text_width);
(
sig_width.max(doc_width),
sig_height + SEPARATOR_HEIGHT + doc_height,
)
}
None => (sig_width, sig_height),
};
Some((width + PADDING, height + PADDING))
}
}
|
