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use unicode_width::UnicodeWidthStr;
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use buffer::Buffer;
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use layout::Rect;
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use style::{Color, Style};
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use widgets::{Block, Widget};
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/// A widget to display a task progress.
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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::{Widget, Gauge, Block, Borders};
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/// # use tui::style::{Style, Color, Modifier};
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/// # fn main() {
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/// Gauge::default()
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/// .block(Block::default().borders(Borders::ALL).title("Progress"))
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/// .style(Style::default().fg(Color::White).bg(Color::Black).modifier(Modifier::Italic))
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/// .percent(20);
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/// # }
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/// ```
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pub struct Gauge<'a> {
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block: Option<Block<'a>>,
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percent: u16,
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label: Option<&'a str>,
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style: Style,
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}
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impl<'a> Default for Gauge<'a> {
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fn default() -> Gauge<'a> {
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Gauge {
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block: None,
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percent: 0,
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label: None,
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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> Gauge<'a> {
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pub fn block(mut self, block: Block<'a>) -> Gauge<'a> {
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self.block = Some(block);
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self
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}
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pub fn percent(mut self, percent: u16) -> Gauge<'a> {
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self.percent = percent;
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self
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}
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pub fn label(mut self, string: &'a str) -> Gauge<'a> {
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self.label = Some(string);
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self
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}
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pub fn style(mut self, style: Style) -> Gauge<'a> {
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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 Gauge<'a> {
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fn draw(&mut self, area: Rect, buf: &mut Buffer) {
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let gauge_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 gauge_area.height < 1 {
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return;
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}
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if self.style.bg != Color::Reset {
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self.background(&gauge_area, buf, self.style.bg);
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}
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let center = gauge_area.height / 2 + gauge_area.top();
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let width = (gauge_area.width * self.percent) / 100;
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let end = gauge_area.left() + width;
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for y in gauge_area.top()..gauge_area.bottom() {
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// Gauge
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for x in gauge_area.left()..end {
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buf.get_mut(x, y).set_symbol(" ");
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}
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if y == center {
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// Label
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let precent_label = format!("{}%", self.percent);
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let label = self.label.unwrap_or(&precent_label);
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let label_width = label.width() as u16;
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let middle = (gauge_area.width - label_width) / 2 + gauge_area.left();
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buf.set_string(middle, y, label, self.style);
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}
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// Fix colors
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for x in gauge_area.left()..end {
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buf.get_mut(x, y)
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.set_fg(self.style.bg)
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.set_bg(self.style.fg);
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}
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}
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}
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}
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