114 lines
3.5 KiB
Rust
114 lines
3.5 KiB
Rust
/*
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* Copyright (C) 2023 Valentin Lorentz
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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use super::Component;
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use color_eyre::eyre::{Result, WrapErr};
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use crossterm::event::{KeyCode, KeyEvent, KeyEventKind, KeyModifiers};
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use ratatui::{prelude::*, widgets::*};
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use crate::components::Action;
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use crate::widgets::{BottomAlignedParagraph, OverlappableWidget};
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#[derive(Default)]
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pub struct Backlog {
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scroll: u64,
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}
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impl Component for Backlog {
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fn handle_key_events(&mut self, key: KeyEvent) -> Result<Option<Action>> {
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match key {
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KeyEvent {
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code: KeyCode::PageUp,
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modifiers: KeyModifiers::NONE,
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kind: KeyEventKind::Press,
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state: _,
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} => {
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self.scroll += 20; // TODO: use the component height
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},
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KeyEvent {
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code: KeyCode::PageDown,
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modifiers: KeyModifiers::NONE,
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kind: KeyEventKind::Press,
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state: _,
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} => {
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self.scroll = self.scroll.saturating_sub(20); // TODO: use the component height
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},
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_ => {},
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}
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Ok(None)
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}
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fn draw(
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&mut self,
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frame: &mut Frame<'_>,
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area: Rect,
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buffers: &crate::buffers::Buffers,
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) -> Result<()> {
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let block = Block::new().borders(Borders::ALL);
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let mut text_area = block.inner(area);
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block.render(area, frame.buffer_mut());
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let active_buffer = buffers.active_buffer();
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let mut items = active_buffer.content();
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items.reverse();
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let mut items = items.into_iter();
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let mut scroll = self.scroll;
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// Skip widgets at the bottom (if scrolled up), and render the first visible one
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loop {
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let Some(item) = items.next() else {
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break;
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};
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let widget = BottomAlignedParagraph::new(item);
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let expected_height = widget.height(text_area.width);
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if scroll.saturating_sub(expected_height) > text_area.height.into() {
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// Paragraph is too far down, not displayed
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scroll -= expected_height;
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continue;
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}
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let widget = widget.scroll(scroll);
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let height = widget.render_overlap(text_area, frame.buffer_mut());
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text_area.height = text_area.height.saturating_sub(height);
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scroll = scroll.saturating_sub(expected_height);
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}
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if text_area.height == 0 {
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// No more room to display other paragraphs, stop now
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return Ok(());
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}
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// Render other widgets
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for item in items {
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let widget = BottomAlignedParagraph::new(item);
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let height = widget.render_overlap(text_area, frame.buffer_mut());
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assert!(area.height >= height, "{:?} {}", area, height);
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text_area.height = text_area.height.saturating_sub(height); // Remove lines at the bottom used by this paragraph
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if text_area.height == 0 {
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// No more room to display other paragraphs, stop now
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return Ok(());
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}
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}
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// There is empty room on screen, ask the buffer to fetch more backlog if it can
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active_buffer.request_back_pagination(100);
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Ok(())
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}
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}
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