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60 lines
1.4 KiB
Rust
60 lines
1.4 KiB
Rust
use std::cmp::min;
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use buffer::Buffer;
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use widgets::{Widget, Block};
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use layout::Rect;
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use style::Color;
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pub struct List<'a> {
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block: Option<Block<'a>>,
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selected: usize,
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items: Vec<(&'a str, Color, Color)>,
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}
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impl<'a> Default for List<'a> {
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fn default() -> List<'a> {
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List {
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block: None,
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selected: 0,
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items: Vec::new(),
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}
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}
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}
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impl<'a> List<'a> {
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pub fn block(&'a mut self, block: Block<'a>) -> &mut List<'a> {
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self.block = Some(block);
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self
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}
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pub fn items(&'a mut self, items: &[(&'a str, Color, Color)]) -> &mut List<'a> {
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self.items = items.to_vec();
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self
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}
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}
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impl<'a> Widget<'a> for List<'a> {
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fn buffer(&'a self, area: &Rect) -> Buffer<'a> {
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let (mut buf, list_area) = match self.block {
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Some(ref b) => (b.buffer(area), b.inner(*area)),
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None => (Buffer::empty(*area), *area),
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};
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let list_length = self.items.len();
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let list_height = list_area.height as usize;
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let bound = min(list_height, list_length);
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let offset = if self.selected > list_height {
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min(self.selected - list_height, list_length - list_height)
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} else {
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0
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};
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for i in 0..bound {
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let index = i + offset;
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let (item, fg, bg) = self.items[index];
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buf.set_string(1, 1 + i as u16, item, fg, bg);
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}
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buf
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}
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}
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