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@ -8,7 +8,6 @@ use tui::{
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};
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use std::borrow::Cow;
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use std::cell::Cell;
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use helix_core::Position;
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use helix_view::Editor;
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@ -24,7 +23,8 @@ pub struct Menu<T> {
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format_fn: Box<dyn Fn(&T) -> Cow<str>>,
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callback_fn: Box<dyn Fn(&mut Editor, Option<&T>, MenuEvent)>,
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scroll: Cell<usize>,
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scroll: usize,
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size: (u16, u16),
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}
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impl<T> Menu<T> {
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@ -40,7 +40,8 @@ impl<T> Menu<T> {
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cursor: None,
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format_fn: Box::new(format_fn),
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callback_fn: Box::new(callback_fn),
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scroll: Cell::new(0),
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scroll: 0,
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size: (0, 0),
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}
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}
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@ -48,11 +49,28 @@ impl<T> Menu<T> {
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// TODO: wrap around to end
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let pos = self.cursor.map(|i| i.saturating_sub(1)).unwrap_or(0) % self.options.len();
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self.cursor = Some(pos);
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self.adjust_scroll();
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}
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pub fn move_down(&mut self) {
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let pos = self.cursor.map(|i| i + 1).unwrap_or(0) % self.options.len();
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self.cursor = Some(pos);
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self.adjust_scroll();
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}
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fn adjust_scroll(&mut self) {
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let win_height = self.size.1 as usize;
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if let Some(cursor) = self.cursor {
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let mut scroll = self.scroll;
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if cursor > (win_height + scroll).saturating_sub(1) {
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// scroll down
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scroll += cursor - (win_height + scroll).saturating_sub(1)
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} else if cursor < scroll {
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// scroll up
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scroll = cursor
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}
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self.scroll = scroll;
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}
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}
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pub fn selection(&self) -> Option<&T> {
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@ -156,30 +174,23 @@ impl<T> Component for Menu<T> {
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let height = std::cmp::min(self.options.len(), MAX);
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let height = std::cmp::min(height, viewport.1 as usize);
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Some((width as u16, height as u16))
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self.size = (width as u16, height as u16);
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// adjust scroll offsets if size changed
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self.adjust_scroll();
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Some(self.size)
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}
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fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
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let style = Style::default().fg(Color::Rgb(164, 160, 232)); // lavender
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let selected = Style::default().fg(Color::Rgb(255, 255, 255));
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// TODO: instead of a cell, all these numbers should be precomputed in handle_event + init
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let mut scroll = self.scroll.get();
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let scroll = self.scroll;
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let len = self.options.len();
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let win_height = area.height as usize;
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if let Some(cursor) = self.cursor {
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if cursor > (win_height + scroll).saturating_sub(1) {
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// scroll down
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scroll += cursor - (win_height + scroll).saturating_sub(1)
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} else if cursor < scroll {
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// scroll up
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scroll = cursor
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}
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self.scroll.set(scroll);
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}
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fn div_ceil(a: usize, b: usize) -> usize {
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(a + b - 1) / a
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}
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