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https://github.com/ratatui-org/ratatui
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Refactor List Widget
* Add a generic item object for the list. The item can either be some data alone or some data and its style * The List widget now store an Iterator over those element. This should avoid the need of allocating memory to store its elements * The List consume the Iterator when it is drawn
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b1737ce667
commit
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2 changed files with 69 additions and 39 deletions
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@ -1,5 +1,7 @@
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use std::iter;
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use std::fmt::Display;
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use std::cmp::min;
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use std::iter::Iterator;
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use unicode_width::UnicodeWidthStr;
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@ -8,46 +10,64 @@ use widgets::{Widget, Block};
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use layout::Rect;
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use style::Style;
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pub enum Item<'a, D: 'a> {
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Data(D),
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StyledData(D, &'a Style),
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}
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pub struct List<'a> {
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pub struct List<'a, L, D: 'a>
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where L: Iterator<Item = Item<'a, D>>
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{
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block: Option<Block<'a>>,
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items: Vec<(&'a str, &'a Style)>,
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items: L,
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style: Style,
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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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impl<'a, L, D> Default for List<'a, L, D>
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where L: Iterator<Item = Item<'a, D>> + Default
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{
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fn default() -> List<'a, L, D> {
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List {
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block: None,
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items: Vec::new(),
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items: L::default(),
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style: Default::default(),
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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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impl<'a, L, D> List<'a, L, D>
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where L: Iterator<Item = Item<'a, D>>
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{
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pub fn new(items: L) -> List<'a, L, D> {
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List {
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block: None,
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items: items,
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style: Default::default(),
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}
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}
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pub fn block(&'a mut self, block: Block<'a>) -> &mut List<'a, L, D> {
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self.block = Some(block);
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self
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}
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pub fn items<I>(&'a mut self, items: &'a [(I, &'a Style)]) -> &mut List<'a>
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where I: AsRef<str> + 'a
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{
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self.items = items
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.iter()
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.map(|&(ref i, s)| (i.as_ref(), s))
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.collect::<Vec<(&'a str, &'a Style)>>();
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pub fn items<I: IntoIterator<Item = Item<'a, D>>>(&'a mut self,
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items: L)
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-> &mut List<'a, L, D> {
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self.items = items;
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self
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}
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pub fn style(&'a mut self, style: Style) -> &mut List<'a> {
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pub fn style(&'a mut self, style: Style) -> &mut List<'a, L, D> {
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self.style = style;
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self
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}
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}
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impl<'a> Widget for List<'a> {
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impl<'a, L, D> Widget for List<'a, L, D>
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where L: Iterator<Item = Item<'a, D>>,
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D: Display
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{
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fn draw(&mut self, area: &Rect, buf: &mut Buffer) {
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let list_area = match self.block {
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Some(ref mut b) => {
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@ -63,13 +83,26 @@ impl<'a> Widget for List<'a> {
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self.background(&list_area, buf, self.style.bg);
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let max_index = min(self.items.len(), list_area.height as usize);
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for (i, &(item, style)) in self.items.iter().enumerate().take(max_index) {
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buf.set_stringn(list_area.left(),
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list_area.top() + i as u16,
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item.as_ref(),
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list_area.width as usize,
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style);
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for (i, item) in self.items
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.by_ref()
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.enumerate()
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.take(list_area.height as usize) {
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match item {
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Item::Data(ref v) => {
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buf.set_stringn(list_area.left(),
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list_area.top() + i as u16,
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&format!("{}", v),
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list_area.width as usize,
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&Style::default());
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}
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Item::StyledData(ref v, ref s) => {
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buf.set_stringn(list_area.left(),
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list_area.top() + i as u16,
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&format!("{}", v),
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list_area.width as usize,
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s);
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}
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};
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}
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}
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}
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@ -180,22 +213,19 @@ impl<'a> Widget for SelectableList<'a> {
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} else {
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0
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};
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let items = self.items
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.iter()
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.cloned()
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.enumerate()
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.map(|(i, item)| if i == selected {
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(format!("{} {}", highlight_symbol, item), highlight_style)
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} else {
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(format!("{} {}", blank_symbol, item), &self.style)
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})
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.skip(offset as usize)
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.collect::<Vec<(String, &Style)>>();
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// Render items
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List::default()
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.block(self.block.unwrap_or_default())
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.items(&items)
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.draw(area, buf);
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List::new(self.items
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.iter()
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.enumerate()
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.map(|(i, item)| if i == selected {
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Item::StyledData(format!("{} {}", highlight_symbol, item),
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highlight_style)
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} else {
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Item::StyledData(format!("{} {}", blank_symbol, item), &self.style)
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})
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.skip(offset as usize))
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.block(self.block.unwrap_or_default())
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.draw(area, buf);
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}
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}
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@ -11,7 +11,7 @@ pub mod canvas;
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pub use self::block::Block;
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pub use self::paragraph::Paragraph;
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pub use self::list::{List, SelectableList};
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pub use self::list::{List, Item, SelectableList};
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pub use self::gauge::Gauge;
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pub use self::sparkline::Sparkline;
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pub use self::chart::{Chart, Axis, Dataset, Marker};
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