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use std::cmp::min;
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use unicode_width::UnicodeWidthStr;
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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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selection_symbol: Option<&'a str>,
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selection_color: Color,
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color: Color,
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background_color: Color,
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items: &'a [&'a str],
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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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selection_symbol: None,
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selection_color: Color::Reset,
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color: Color::Reset,
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background_color: Color::Reset,
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items: &[],
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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 [&'a str]) -> &mut List<'a> {
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self.items = items;
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self
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}
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pub fn color(&'a mut self, color: Color) -> &mut List<'a> {
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self.color = color;
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self
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}
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pub fn background_color(&'a mut self, color: Color) -> &mut List<'a> {
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self.background_color = color;
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self
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}
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pub fn selection_symbol(&'a mut self, selection_symbol: &'a str) -> &mut List<'a> {
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self.selection_symbol = Some(selection_symbol);
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self
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}
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pub fn selection_color(&'a mut self, selection_color: Color) -> &mut List<'a> {
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self.selection_color = selection_color;
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self
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}
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pub fn select(&'a mut self, index: usize) -> &'a mut List<'a> {
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self.selected = index;
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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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let x = match self.selection_symbol {
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Some(s) => (s.width() + 2) as u16,
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None => 1,
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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 = self.items[index];
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let color = if index == self.selected {
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self.selection_color
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} else {
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self.color
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};
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buf.set_string(x, 1 + i as u16, item, color, self.background_color);
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}
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if let Some(s) = self.selection_symbol {
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buf.set_string(1,
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(1 + self.selected - offset) as u16,
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s,
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self.selection_color,
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self.background_color);
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}
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buf
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}
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}
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