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gauge.rs
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gauge.rs
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use crate::{
buffer::Buffer,
layout::Rect,
style::{Color, Style},
symbols,
text::{Span, Spans},
widgets::{Block, Widget},
};
/// A widget to display a task progress.
///
/// # Examples:
///
/// ```
/// # use tui::widgets::{Widget, Gauge, Block, Borders};
/// # use tui::style::{Style, Color, Modifier};
/// Gauge::default()
/// .block(Block::default().borders(Borders::ALL).title("Progress"))
/// .gauge_style(Style::default().fg(Color::White).bg(Color::Black).add_modifier(Modifier::ITALIC))
/// .percent(20);
/// ```
#[derive(Debug, Clone)]
pub struct Gauge<'a> {
block: Option<Block<'a>>,
ratio: f64,
label: Option<Span<'a>>,
use_unicode: bool,
style: Style,
gauge_style: Style,
}
impl<'a> Default for Gauge<'a> {
fn default() -> Gauge<'a> {
Gauge {
block: None,
ratio: 0.0,
label: None,
use_unicode: false,
style: Style::default(),
gauge_style: Style::default(),
}
}
}
impl<'a> Gauge<'a> {
pub fn block(mut self, block: Block<'a>) -> Gauge<'a> {
self.block = Some(block);
self
}
pub fn percent(mut self, percent: u16) -> Gauge<'a> {
assert!(
percent <= 100,
"Percentage should be between 0 and 100 inclusively."
);
self.ratio = f64::from(percent) / 100.0;
self
}
/// Sets ratio ([0.0, 1.0]) directly.
pub fn ratio(mut self, ratio: f64) -> Gauge<'a> {
assert!(
(0.0..=1.0).contains(&ratio),
"Ratio should be between 0 and 1 inclusively."
);
self.ratio = ratio;
self
}
pub fn label<T>(mut self, label: T) -> Gauge<'a>
where
T: Into<Span<'a>>,
{
self.label = Some(label.into());
self
}
pub fn style(mut self, style: Style) -> Gauge<'a> {
self.style = style;
self
}
pub fn gauge_style(mut self, style: Style) -> Gauge<'a> {
self.gauge_style = style;
self
}
pub fn use_unicode(mut self, unicode: bool) -> Gauge<'a> {
self.use_unicode = unicode;
self
}
}
impl<'a> Widget for Gauge<'a> {
fn render(mut self, area: Rect, buf: &mut Buffer) {
buf.set_style(area, self.style);
let gauge_area = match self.block.take() {
Some(b) => {
let inner_area = b.inner(area);
b.render(area, buf);
inner_area
}
None => area,
};
buf.set_style(gauge_area, self.gauge_style);
if gauge_area.height < 1 {
return;
}
// compute label value and its position
// label is put at the center of the gauge_area
let label = {
let pct = f64::round(self.ratio * 100.0);
self.label
.unwrap_or_else(|| Span::from(format!("{}%", pct)))
};
let clamped_label_width = gauge_area.width.min(label.width() as u16);
let label_col = gauge_area.left() + (gauge_area.width - clamped_label_width) / 2;
let label_row = gauge_area.top() + gauge_area.height / 2;
// the gauge will be filled proportionally to the ratio
let filled_width = f64::from(gauge_area.width) * self.ratio;
let end = if self.use_unicode {
gauge_area.left() + filled_width.floor() as u16
} else {
gauge_area.left() + filled_width.round() as u16
};
for y in gauge_area.top()..gauge_area.bottom() {
// render the filled area (left to end)
for x in gauge_area.left()..end {
// spaces are needed to apply the background styling
buf.get_mut(x, y)
.set_symbol(" ")
.set_fg(self.gauge_style.bg.unwrap_or(Color::Reset))
.set_bg(self.gauge_style.fg.unwrap_or(Color::Reset));
}
if self.use_unicode && self.ratio < 1.0 {
buf.get_mut(end, y)
.set_symbol(get_unicode_block(filled_width % 1.0));
}
}
// set the span
buf.set_span(label_col, label_row, &label, clamped_label_width);
}
}
fn get_unicode_block<'a>(frac: f64) -> &'a str {
match (frac * 8.0).round() as u16 {
1 => symbols::block::ONE_EIGHTH,
2 => symbols::block::ONE_QUARTER,
3 => symbols::block::THREE_EIGHTHS,
4 => symbols::block::HALF,
5 => symbols::block::FIVE_EIGHTHS,
6 => symbols::block::THREE_QUARTERS,
7 => symbols::block::SEVEN_EIGHTHS,
8 => symbols::block::FULL,
_ => " ",
}
}
/// A compact widget to display a task progress over a single line.
///
/// # Examples:
///
/// ```
/// # use tui::widgets::{Widget, LineGauge, Block, Borders};
/// # use tui::style::{Style, Color, Modifier};
/// # use tui::symbols;
/// LineGauge::default()
/// .block(Block::default().borders(Borders::ALL).title("Progress"))
/// .gauge_style(Style::default().fg(Color::White).bg(Color::Black).add_modifier(Modifier::BOLD))
/// .line_set(symbols::line::THICK)
/// .ratio(0.4);
/// ```
pub struct LineGauge<'a> {
block: Option<Block<'a>>,
ratio: f64,
label: Option<Spans<'a>>,
line_set: symbols::line::Set,
style: Style,
gauge_style: Style,
}
impl<'a> Default for LineGauge<'a> {
fn default() -> Self {
Self {
block: None,
ratio: 0.0,
label: None,
style: Style::default(),
line_set: symbols::line::NORMAL,
gauge_style: Style::default(),
}
}
}
impl<'a> LineGauge<'a> {
pub fn block(mut self, block: Block<'a>) -> Self {
self.block = Some(block);
self
}
pub fn ratio(mut self, ratio: f64) -> Self {
assert!(
(0.0..=1.0).contains(&ratio),
"Ratio should be between 0 and 1 inclusively."
);
self.ratio = ratio;
self
}
pub fn line_set(mut self, set: symbols::line::Set) -> Self {
self.line_set = set;
self
}
pub fn label<T>(mut self, label: T) -> Self
where
T: Into<Spans<'a>>,
{
self.label = Some(label.into());
self
}
pub fn style(mut self, style: Style) -> Self {
self.style = style;
self
}
pub fn gauge_style(mut self, style: Style) -> Self {
self.gauge_style = style;
self
}
}
impl<'a> Widget for LineGauge<'a> {
fn render(mut self, area: Rect, buf: &mut Buffer) {
buf.set_style(area, self.style);
let gauge_area = match self.block.take() {
Some(b) => {
let inner_area = b.inner(area);
b.render(area, buf);
inner_area
}
None => area,
};
if gauge_area.height < 1 {
return;
}
let ratio = self.ratio;
let label = self
.label
.unwrap_or_else(move || Spans::from(format!("{:.0}%", ratio * 100.0)));
let (col, row) = buf.set_spans(
gauge_area.left(),
gauge_area.top(),
&label,
gauge_area.width,
);
let start = col + 1;
if start >= gauge_area.right() {
return;
}
let end = start
+ (f64::from(gauge_area.right().saturating_sub(start)) * self.ratio).floor() as u16;
for col in start..end {
buf.get_mut(col, row)
.set_symbol(self.line_set.horizontal)
.set_style(Style {
fg: self.gauge_style.fg,
bg: None,
add_modifier: self.gauge_style.add_modifier,
sub_modifier: self.gauge_style.sub_modifier,
});
}
for col in end..gauge_area.right() {
buf.get_mut(col, row)
.set_symbol(self.line_set.horizontal)
.set_style(Style {
fg: self.gauge_style.bg,
bg: None,
add_modifier: self.gauge_style.add_modifier,
sub_modifier: self.gauge_style.sub_modifier,
});
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[should_panic]
fn gauge_invalid_percentage() {
Gauge::default().percent(110);
}
#[test]
#[should_panic]
fn gauge_invalid_ratio_upper_bound() {
Gauge::default().ratio(1.1);
}
#[test]
#[should_panic]
fn gauge_invalid_ratio_lower_bound() {
Gauge::default().ratio(-0.5);
}
}