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|
use tui::{
buffer::Buffer,
layout::Rect,
style::Style,
text::Line,
widgets::{Block, Widget},
};
#[derive(Debug, Clone, Copy)]
pub enum LabelLimit {
None,
Auto(u16),
Bars,
StartLabel,
}
impl Default for LabelLimit {
fn default() -> Self {
Self::None
}
}
/// A widget to measure something, using pipe characters ('|') as a unit.
#[derive(Debug, Clone)]
pub struct PipeGauge<'a> {
block: Option<Block<'a>>,
ratio: f64,
start_label: Option<Line<'a>>,
inner_label: Option<Line<'a>>,
label_style: Style,
gauge_style: Style,
hide_parts: LabelLimit,
}
impl<'a> Default for PipeGauge<'a> {
fn default() -> Self {
Self {
block: None,
ratio: 0.0,
start_label: None,
inner_label: None,
label_style: Style::default(),
gauge_style: Style::default(),
hide_parts: LabelLimit::default(),
}
}
}
impl<'a> PipeGauge<'a> {
/// The ratio, a value from 0.0 to 1.0 (any other greater or less will be clamped)
/// represents the portion of the pipe gauge to fill.
///
/// Note: passing in NaN will potentially cause problems.
pub fn ratio(mut self, ratio: f64) -> Self {
self.ratio = ratio.clamp(0.0, 1.0);
self
}
/// The label displayed before the bar.
pub fn start_label<T>(mut self, start_label: T) -> Self
where
T: Into<Line<'a>>,
{
self.start_label = Some(start_label.into());
self
}
/// The label displayed inside the bar.
pub fn inner_label<T>(mut self, inner_label: T) -> Self
where
T: Into<Line<'a>>,
{
self.inner_label = Some(inner_label.into());
self
}
/// The style of the labels.
pub fn label_style(mut self, label_style: Style) -> Self {
self.label_style = label_style;
self
}
/// The style of the gauge itself.
pub fn gauge_style(mut self, style: Style) -> Self {
self.gauge_style = style;
self
}
/// Whether to hide parts of the gauge/label if the inner label wouldn't fit.
pub fn hide_parts(mut self, hide_parts: LabelLimit) -> Self {
self.hide_parts = hide_parts;
self
}
}
impl<'a> Widget for PipeGauge<'a> {
fn render(mut self, area: Rect, buf: &mut Buffer) {
buf.set_style(area, self.label_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 (col, row) = {
let inner_label_width = self
.inner_label
.as_ref()
.map(|l| l.width())
.unwrap_or_default();
let start_label_width = self
.start_label
.as_ref()
.map(|l| l.width())
.unwrap_or_default();
match self.hide_parts {
LabelLimit::StartLabel => {
let inner_label = self.inner_label.unwrap_or_else(|| Line::from(""));
let _ = buf.set_line(
gauge_area.left(),
gauge_area.top(),
&inner_label,
inner_label.width() as u16,
);
// Short circuit.
return;
}
LabelLimit::Auto(_)
if gauge_area.width < (inner_label_width + start_label_width + 1) as u16 =>
{
let inner_label = self.inner_label.unwrap_or_else(|| Line::from(""));
let _ = buf.set_line(
gauge_area.left(),
gauge_area.top(),
&inner_label,
inner_label.width() as u16,
);
// Short circuit.
return;
}
_ => {
let start_label = self.start_label.unwrap_or_else(|| Line::from(""));
buf.set_line(
gauge_area.left(),
gauge_area.top(),
&start_label,
start_label.width() as u16,
)
}
}
};
let end_label = self.inner_label.unwrap_or_else(|| Line::from(""));
match self.hide_parts {
LabelLimit::Bars => {
let _ = buf.set_line(
gauge_area
.right()
.saturating_sub(end_label.width() as u16 + 1),
row,
&end_label,
end_label.width() as u16,
);
}
LabelLimit::Auto(width_limit)
if gauge_area.right().saturating_sub(col) < width_limit =>
{
let _ = buf.set_line(
gauge_area
.right()
.saturating_sub(end_label.width() as u16 + 1),
row,
&end_label,
1,
);
}
LabelLimit::Auto(_) | LabelLimit::None => {
let (start, _) = buf.set_line(col, row, &Line::from("["), gauge_area.width);
if start >= gauge_area.right() {
return;
}
let (end, _) = buf.set_line(
(gauge_area.x + gauge_area.width).saturating_sub(1),
row,
&Line::from("]"),
gauge_area.width,
);
let pipe_end =
start + (f64::from(end.saturating_sub(start)) * self.ratio).floor() as u16;
for col in start..pipe_end {
buf.get_mut(col, row).set_symbol("|").set_style(Style {
fg: self.gauge_style.fg,
bg: None,
add_modifier: self.gauge_style.add_modifier,
sub_modifier: self.gauge_style.sub_modifier,
underline_color: None,
});
}
if (end_label.width() as u16) < end.saturating_sub(start) {
let gauge_end = gauge_area
.right()
.saturating_sub(end_label.width() as u16 + 1);
buf.set_line(gauge_end, row, &end_label, end_label.width() as u16);
}
}
LabelLimit::StartLabel => unreachable!(),
}
}
}
|
