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use unicode_width::UnicodeWidthStr;
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use widgets::{Block, Widget};
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use buffer::Buffer;
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use layout::Rect;
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use style::Style;
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use symbols::line;
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/// A widget to display available tabs in a multiple panels context.
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///
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/// # Examples
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///
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/// ```
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/// # extern crate tui;
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/// # use tui::widgets::{Block, border, Tabs};
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/// # use tui::style::{Style, Color};
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/// # fn main() {
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/// Tabs::default()
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/// .block(Block::default().title("Tabs").borders(border::ALL))
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/// .titles(&["Tab1", "Tab2", "Tab3", "Tab4"])
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/// .style(Style::default().fg(Color::White))
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/// .highlight_style(Style::default().fg(Color::Yellow));
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/// # }
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/// ```
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pub struct Tabs<'a> {
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/// A block to wrap this widget in if necessary
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block: Option<Block<'a>>,
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/// One title for each tab
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titles: &'a [&'a str],
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/// The index of the selected tabs
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selected: usize,
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/// The style used to draw the text
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style: Style,
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/// The style used to display the selected item
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highlight_style: Style,
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}
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impl<'a> Default for Tabs<'a> {
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fn default() -> Tabs<'a> {
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Tabs {
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block: None,
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titles: &[],
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selected: 0,
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style: Default::default(),
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highlight_style: Default::default(),
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}
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}
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}
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impl<'a> Tabs<'a> {
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pub fn block(&mut self, block: Block<'a>) -> &mut Tabs<'a> {
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self.block = Some(block);
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self
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}
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pub fn titles(&mut self, titles: &'a [&'a str]) -> &mut Tabs<'a> {
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self.titles = titles;
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self
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}
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pub fn select(&mut self, selected: usize) -> &mut Tabs<'a> {
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self.selected = selected;
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self
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}
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pub fn style(&mut self, style: Style) -> &mut Tabs<'a> {
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self.style = style;
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self
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}
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pub fn highlight_style(&mut self, style: Style) -> &mut Tabs<'a> {
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self.highlight_style = style;
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self
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}
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}
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impl<'a> Widget for Tabs<'a> {
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fn draw(&mut self, area: &Rect, buf: &mut Buffer) {
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let tabs_area = match self.block {
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Some(ref mut b) => {
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b.draw(area, buf);
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b.inner(area)
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}
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None => *area,
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};
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if tabs_area.height < 1 {
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return;
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}
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self.background(&tabs_area, buf, self.style.bg);
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let mut x = tabs_area.left();
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for (title, style) in self.titles
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.iter()
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.enumerate()
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.map(|(i, t)| if i == self.selected {
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(t, &self.highlight_style)
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} else {
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(t, &self.style)
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}) {
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x += 1;
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if x > tabs_area.right() {
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break;
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} else {
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buf.set_string(x, tabs_area.top(), title, style);
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x += title.width() as u16 + 1;
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if x >= tabs_area.right() {
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break;
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} else {
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buf.get_mut(x, tabs_area.top())
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.set_symbol(line::VERTICAL)
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.set_fg(self.style.fg)
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.set_bg(self.style.bg);
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x += 1;
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}
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}
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}
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}
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}
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