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|
use tui::{
layout::Rect,
text::Span,
widgets::{Block, Borders},
};
use crate::canvas::Painter;
/// A factory pattern builder for a tui [`Block`].
pub struct BlockBuilder {
borders: Borders,
selected: bool,
show_esc: bool,
name: &'static str,
hide_title: bool,
extra_text: Option<String>,
}
impl BlockBuilder {
/// Creates a new [`BlockBuilder`] with the name of block.
pub fn new(name: &'static str) -> Self {
Self {
borders: Borders::ALL,
selected: false,
show_esc: false,
name,
hide_title: false,
extra_text: None,
}
}
/// Indicates that this block is currently selected, and should be drawn as such.
pub fn selected(mut self, selected: bool) -> Self {
self.selected = selected;
self
}
/// Indicates that this block should show esc, and should be drawn as such.
pub fn show_esc(mut self, show_esc: bool) -> Self {
self.show_esc = show_esc;
self
}
/// Indicates that this block has some extra text beyond the name.
pub fn extra_text(mut self, extra_text: Option<String>) -> Self {
self.extra_text = extra_text;
self
}
/// Determines the borders of the built [`Block`].
pub fn borders(mut self, borders: Borders) -> Self {
self.borders = borders;
self
}
/// Forcibly hides the title of the built [`Block`].
pub fn hide_title(mut self, hide_title: bool) -> Self {
self.hide_title = hide_title;
self
}
/// Converts the [`BlockBuilder`] into an actual [`Block`].
pub fn build(self, painter: &Painter, area: Rect) -> Block<'static> {
let has_title = !self.hide_title
&& (self.borders.contains(Borders::TOP) || self.borders.contains(Borders::BOTTOM));
let border_style = if self.selected {
painter.colours.highlighted_border_style
} else {
painter.colours.border_style
};
let block = Block::default()
.border_style(border_style)
.borders(self.borders);
let inner_width = block.inner(area).width as usize;
if has_title {
let name = Span::styled(
format!(" {} ", self.name),
painter.colours.widget_title_style,
);
let mut title_len = name.width();
let mut title = vec![name, Span::from(""), Span::from(""), Span::from("")];
if self.show_esc {
const EXPAND_TEXT: &str = " Esc to go back ";
const EXPAND_TEXT_LEN: usize = EXPAND_TEXT.len();
let expand_span = Span::styled(EXPAND_TEXT, border_style);
if title_len + EXPAND_TEXT_LEN <= inner_width {
title_len += EXPAND_TEXT_LEN;
title[3] = expand_span;
}
}
if let Some(extra_text) = self.extra_text {
let extra_span = Span::styled(
format!("{} ", extra_text),
painter.colours.widget_title_style,
);
let width = extra_span.width();
if title_len + width <= inner_width {
title_len += width;
title[1] = extra_span;
}
}
if self.show_esc {
let difference = inner_width.saturating_sub(title_len);
title[2] = Span::styled("─".repeat(difference), border_style);
}
block.title(title)
} else {
block
}
}
}
|
