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helix-plus/helix-view/src/view.rs

49 lines
1.2 KiB
Rust

use anyhow::Error;
use std::path::PathBuf;
use crate::theme::Theme;
use helix_core::State;
pub struct View {
pub state: State,
pub first_line: u16,
pub size: (u16, u16),
pub theme: Theme, // TODO: share one instance
}
impl View {
pub fn open(path: PathBuf, size: (u16, u16)) -> Result<View, Error> {
let mut state = State::load(path)?;
let theme = Theme::default();
state.syntax.as_mut().unwrap().configure(theme.scopes());
let view = View {
state,
first_line: 0,
size, // TODO: pass in from term
theme,
};
Ok(view)
}
pub fn ensure_cursor_in_view(&mut self) {
let cursor = self.state.selection().cursor();
let line = self.state.doc().char_to_line(cursor) as u16;
let document_end = self.first_line + self.size.1.saturating_sub(1) - 1;
let padding = 5u16;
// TODO: side scroll
if line > document_end.saturating_sub(padding) {
// scroll down
self.first_line += line - (document_end.saturating_sub(padding));
} else if line < self.first_line + padding {
// scroll up
self.first_line = line.saturating_sub(padding);
}
}
}