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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| pub mod scrollable; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| use ratatui::{ | ||
| prelude::*, | ||
| widgets::{Block, WidgetRef}, | ||
| }; | ||
|
|
||
| #[derive(Debug, Clone)] | ||
| pub struct Scrollable<'a> { | ||
| child_buffer: Buffer, | ||
| block: Option<Block<'a>>, | ||
| state: ScrollableState, | ||
| } | ||
|
|
||
| #[derive(Debug, Clone, Default)] | ||
| pub struct ScrollableState { | ||
| x_offset: u16, | ||
| y_offset: u16, | ||
| } | ||
|
|
||
| impl<'a> Scrollable<'a> { | ||
| pub fn new(child_widget: Box<dyn WidgetRef>, max_height: u16, max_width: u16) -> Self { | ||
| let mut buf = Buffer::empty(Rect::new(0, 0, max_width, max_height)); | ||
| child_widget.render_ref(buf.area, &mut buf); | ||
| let child_buffer = clamp(buf); | ||
| let state = ScrollableState::default(); | ||
| Self { child_buffer, state, block: None } | ||
| } | ||
|
|
||
| pub fn block(mut self, block: Block<'a>) -> Self { | ||
| self.block = Some(block); | ||
| self | ||
| } | ||
|
|
||
| pub fn log(&self) { | ||
| let buf_height = self.child_buffer.area.height; | ||
| let buf_width = self.child_buffer.area.width; | ||
| for n in 0..buf_height { | ||
| let mut line: String = String::from(""); | ||
| let cells = | ||
| self.child_buffer.content.to_vec()[((n * buf_width) as usize)..(((n + 1) * buf_width) as usize)].to_vec(); | ||
| for cell in cells.iter() { | ||
| line += cell.clone().symbol(); | ||
| } | ||
| log::info!("{}", line.as_str()); | ||
| } | ||
| } | ||
|
|
||
| pub fn debug_log(&self) { | ||
| let buf_height = self.child_buffer.area.height; | ||
| let buf_width = self.child_buffer.area.width; | ||
| for n in 0..buf_height { | ||
| let mut line: String = String::from(""); | ||
| let cells = | ||
| self.child_buffer.content.to_vec()[((n * buf_width) as usize)..(((n + 1) * buf_width) as usize)].to_vec(); | ||
| for cell in cells.iter() { | ||
| line += cell.clone().symbol(); | ||
| } | ||
| log::info!( | ||
| "rendering line {}/{}, length {}, last symbol {}, last symbol is blank {}:", | ||
| n, | ||
| buf_height, | ||
| line.len(), | ||
| cells[cells.len() - 1].symbol(), | ||
| cells[cells.len() - 1].symbol() == " " | ||
| ); | ||
|
|
||
| log::info!("{}", line.as_str()); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<'a> StatefulWidget for Scrollable<'a> { | ||
| type State = ScrollableState; | ||
|
|
||
| fn render(self, area: Rect, buf: &mut Buffer, state: &mut Self::State) { | ||
| self.block.render_ref(area, buf); | ||
| let render_area = self.block.inner_if_some(area); | ||
| if render_area.is_empty() { | ||
| return; | ||
| } | ||
| log::info!("render area: {}", render_area); | ||
| let area = render_area.intersection(buf.area); | ||
| log::info!("intersection area: {}", area); | ||
| let max_x = Ord::min(area.x.saturating_add(area.width), buf.area.right()); | ||
| let max_y = Ord::min(area.y.saturating_add(area.height), buf.area.bottom()); | ||
| let content_height = self.child_buffer.area.height; | ||
| let content_width = self.child_buffer.area.width; | ||
| for i in area.y..max_y { | ||
| let content_i = i - area.y; | ||
| let row = self.child_buffer.content.to_vec()[(((content_i + state.y_offset) * content_width) as usize) | ||
| ..(((content_i + state.y_offset + 1) * content_width) as usize)] | ||
| .to_vec(); | ||
| for j in area.x..max_x { | ||
| let content_j = j - area.x; | ||
| let cell = &row[(content_j + state.x_offset) as usize]; | ||
| buf.get_mut(j, i).set_symbol(cell.symbol()).set_fg(cell.fg).set_bg(cell.bg).set_skip(cell.skip); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn clamp(buf: Buffer) -> Buffer { | ||
| let height = buf.area.height; | ||
| let width = buf.area.width; | ||
| let mut used_height: u16 = 0; | ||
| let mut used_width: u16 = 0; | ||
| for i in (0..height).rev() { | ||
| let row = buf.content.to_vec()[((i * width) as usize)..(((i + 1) * width) as usize)].to_vec(); | ||
| for j in (0..width).rev() { | ||
| let cell = row[j as usize].clone(); | ||
| if cell.symbol() != " " { | ||
| used_height = std::cmp::max(used_height, i + 1); | ||
| used_width = std::cmp::max(used_width, j + 1); | ||
| } | ||
| } | ||
| } | ||
| let mut content: Vec<ratatui::buffer::Cell> = Vec::new(); | ||
| for i in 0..used_height { | ||
| let row = buf.content.to_vec()[((i * width) as usize)..(((i + 1) * width) as usize)].to_vec(); | ||
| for j in 0..used_width { | ||
| content.push(row[j as usize].clone().to_owned()); | ||
| } | ||
| } | ||
| Buffer { area: Rect::new(0, 0, used_width, used_height), content } | ||
| } |