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, /// Part of signature text active_param_range: Option<(usize, usize)>, language: String, config_loader: Arc, } impl SignatureHelp { pub const ID: &'static str = "signature-help"; pub fn new(signature: String, language: String, config_loader: Arc) -> Self { Self { signature, signature_doc: None, active_param_range: None, language, config_loader, } } pub fn set_signature_doc(&mut self, signature_doc: Option) { 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> { compositor.find_id::>(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) .clip_bottom(u16::from(cx.editor.popup_border())); 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)) } }