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use either::Either;
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use unicode_segmentation::UnicodeSegmentation;
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use unicode_width::UnicodeWidthStr;
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use crate::buffer::Buffer;
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use crate::layout::{Alignment, Rect};
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use crate::style::Style;
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use crate::widgets::reflow::{LineComposer, LineTruncator, Styled, WordWrapper};
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use crate::widgets::{Block, Text, Widget};
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fn get_line_offset(line_width: u16, text_area_width: u16, alignment: Alignment) -> u16 {
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match alignment {
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Alignment::Center => (text_area_width / 2).saturating_sub(line_width / 2),
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Alignment::Right => text_area_width.saturating_sub(line_width),
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Alignment::Left => 0,
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}
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}
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/// A widget to display some text.
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///
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/// # Examples
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///
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/// ```
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/// # use tui::widgets::{Block, Borders, Paragraph, Text};
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/// # use tui::style::{Style, Color};
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/// # use tui::layout::{Alignment};
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/// # fn main() {
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/// let text = [
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/// Text::raw("First line\n"),
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/// Text::styled("Second line\n", Style::default().fg(Color::Red))
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/// ];
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/// Paragraph::new(text.iter())
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/// .block(Block::default().title("Paragraph").borders(Borders::ALL))
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/// .style(Style::default().fg(Color::White).bg(Color::Black))
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/// .alignment(Alignment::Center)
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/// .wrap(true);
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/// # }
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/// ```
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pub struct Paragraph<'a, 't, T>
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where
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T: Iterator<Item = &'t Text<'t>>,
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{
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/// A block to wrap the widget in
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block: Option<Block<'a>>,
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/// Widget style
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style: Style,
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/// Wrap the text or not
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wrapping: bool,
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/// The text to display
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text: T,
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/// Should we parse the text for embedded commands
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raw: bool,
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/// Scroll
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scroll: u16,
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/// Aligenment of the text
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alignment: Alignment,
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}
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impl<'a, 't, T> Paragraph<'a, 't, T>
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where
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T: Iterator<Item = &'t Text<'t>>,
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{
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pub fn new(text: T) -> Paragraph<'a, 't, T> {
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Paragraph {
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block: None,
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style: Default::default(),
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wrapping: false,
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raw: false,
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text,
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scroll: 0,
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alignment: Alignment::Left,
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}
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}
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pub fn block(mut self, block: Block<'a>) -> Paragraph<'a, 't, T> {
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self.block = Some(block);
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self
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}
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pub fn style(mut self, style: Style) -> Paragraph<'a, 't, T> {
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self.style = style;
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self
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}
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pub fn wrap(mut self, flag: bool) -> Paragraph<'a, 't, T> {
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self.wrapping = flag;
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self
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}
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pub fn raw(mut self, flag: bool) -> Paragraph<'a, 't, T> {
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self.raw = flag;
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self
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}
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pub fn scroll(mut self, offset: u16) -> Paragraph<'a, 't, T> {
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self.scroll = offset;
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self
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}
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pub fn alignment(mut self, alignment: Alignment) -> Paragraph<'a, 't, T> {
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self.alignment = alignment;
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self
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}
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}
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impl<'a, 't, 'b, T> Widget for Paragraph<'a, 't, T>
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where
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T: Iterator<Item = &'t Text<'t>>,
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{
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fn draw(&mut self, area: Rect, buf: &mut Buffer) {
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let text_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 text_area.height < 1 {
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return;
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}
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self.background(text_area, buf, self.style.bg);
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let style = self.style;
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let mut styled = self.text.by_ref().flat_map(|t| match *t {
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Text::Raw(ref d) => {
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let data: &'t str = d; // coerce to &str
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Either::Left(UnicodeSegmentation::graphemes(data, true).map(|g| Styled(g, style)))
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}
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Text::Styled(ref d, s) => {
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let data: &'t str = d; // coerce to &str
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Either::Right(UnicodeSegmentation::graphemes(data, true).map(move |g| Styled(g, s)))
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}
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});
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let mut line_composer: Box<dyn LineComposer> = if self.wrapping {
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Box::new(WordWrapper::new(&mut styled, text_area.width))
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} else {
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Box::new(LineTruncator::new(&mut styled, text_area.width))
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};
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let mut y = 0;
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while let Some((current_line, current_line_width)) = line_composer.next_line() {
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if y >= self.scroll {
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let mut x = get_line_offset(current_line_width, text_area.width, self.alignment);
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for Styled(symbol, style) in current_line {
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buf.get_mut(text_area.left() + x, text_area.top() + y - self.scroll)
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.set_symbol(symbol)
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.set_style(*style);
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x += symbol.width() as u16;
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}
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}
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y += 1;
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if y >= text_area.height + self.scroll {
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break;
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}
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}
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}
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}
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