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use std::iter::repeat;
use tui::{
buffer::Buffer,
layout::Rect,
widgets::{Block, Paragraph, Text, Widget},
};
#[derive(Default)]
pub struct ListState {
/// The index at which the list last started. Used for scrolling
pub start_index: usize,
}
impl ListState {
pub fn update(&mut self, selected: Option<usize>, height: usize) -> &mut Self {
self.start_index = match selected {
Some(pos) => match height as usize {
h if self.start_index + h - 1 < pos => pos - h + 1,
_ if self.start_index > pos => pos,
_ => self.start_index,
},
None => 0,
};
self
}
}
pub fn fill_background_to_right(mut s: String, entire_width: u16) -> String {
match (s.len(), entire_width as usize) {
(x, y) if x >= y => s,
(x, y) => {
s.extend(repeat(' ').take(y - x));
s
}
}
}
pub struct List<'b, 't, I>
where
I: Iterator<Item = Vec<Text<'t>>>,
{
pub block: Option<Block<'b>>,
pub items: I,
}
impl<'b, 't, I> Widget for List<'b, 't, I>
where
I: Iterator<Item = Vec<Text<'t>>>,
{
fn draw(&mut self, area: Rect, buf: &mut Buffer) {
let list_area = match self.block {
Some(ref mut b) => {
b.draw(area, buf);
b.inner(area)
}
None => area,
};
if list_area.width < 1 || list_area.height < 1 {
return;
}
for (i, text_iterator) in self
.items
.by_ref()
.enumerate()
.take(list_area.height as usize)
{
let (x, y) = (list_area.left(), list_area.top() + i as u16);
Paragraph::new(text_iterator.iter()).draw(
Rect {
x,
y,
width: list_area.width,
height: 1,
},
buf,
);
}
}
}
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