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186 lines
5.4 KiB
Rust
186 lines
5.4 KiB
Rust
use crate::buffer::Buffer;
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use crate::layout::Rect;
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use crate::style::Style;
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use crate::symbols::line;
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use crate::widgets::{Borders, Widget};
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/// Base widget to be used with all upper level ones. It may be used to display a box border around
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/// the widget and/or add a title.
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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};
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/// # use tui::style::{Style, Color};
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/// # fn main() {
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/// Block::default()
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/// .title("Block")
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/// .title_style(Style::default().fg(Color::Red))
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/// .borders(Borders::LEFT | Borders::RIGHT)
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/// .border_style(Style::default().fg(Color::White))
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/// .style(Style::default().bg(Color::Black));
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/// # }
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/// ```
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#[derive(Clone, Copy)]
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pub struct Block<'a> {
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/// Optional title place on the upper left of the block
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title: Option<&'a str>,
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/// Title style
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title_style: Style,
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/// Visible borders
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borders: Borders,
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/// Border style
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border_style: Style,
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/// Widget style
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style: Style,
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}
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impl<'a> Default for Block<'a> {
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fn default() -> Block<'a> {
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Block {
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title: None,
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title_style: Default::default(),
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borders: Borders::NONE,
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border_style: Default::default(),
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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> Block<'a> {
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pub fn title(mut self, title: &'a str) -> Block<'a> {
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self.title = Some(title);
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self
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}
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pub fn title_style(mut self, style: Style) -> Block<'a> {
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self.title_style = style;
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self
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}
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pub fn border_style(mut self, style: Style) -> Block<'a> {
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self.border_style = style;
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self
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}
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pub fn style(mut self, style: Style) -> Block<'a> {
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self.style = style;
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self
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}
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pub fn borders(mut self, flag: Borders) -> Block<'a> {
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self.borders = flag;
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self
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}
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/// Compute the inner area of a block based on its border visibility rules.
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pub fn inner(&self, area: Rect) -> Rect {
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if area.width < 2 || area.height < 2 {
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return Rect::default();
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}
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let mut inner = area;
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if self.borders.intersects(Borders::LEFT) {
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inner.x += 1;
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inner.width -= 1;
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}
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if self.borders.intersects(Borders::TOP) || self.title.is_some() {
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inner.y += 1;
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inner.height -= 1;
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}
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if self.borders.intersects(Borders::RIGHT) {
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inner.width -= 1;
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}
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if self.borders.intersects(Borders::BOTTOM) {
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inner.height -= 1;
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}
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inner
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}
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}
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impl<'a> Widget for Block<'a> {
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fn draw(&mut self, area: Rect, buf: &mut Buffer) {
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if area.width < 2 || area.height < 2 {
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return;
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}
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self.background(&area, buf, self.style.bg);
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// Sides
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if self.borders.intersects(Borders::LEFT) {
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for y in area.top()..area.bottom() {
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buf.get_mut(area.left(), y)
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.set_symbol(line::VERTICAL)
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.set_style(self.border_style);
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}
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}
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if self.borders.intersects(Borders::TOP) {
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for x in area.left()..area.right() {
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buf.get_mut(x, area.top())
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.set_symbol(line::HORIZONTAL)
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.set_style(self.border_style);
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}
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}
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if self.borders.intersects(Borders::RIGHT) {
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let x = area.right() - 1;
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for y in area.top()..area.bottom() {
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buf.get_mut(x, y)
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.set_symbol(line::VERTICAL)
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.set_style(self.border_style);
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}
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}
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if self.borders.intersects(Borders::BOTTOM) {
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let y = area.bottom() - 1;
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for x in area.left()..area.right() {
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buf.get_mut(x, y)
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.set_symbol(line::HORIZONTAL)
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.set_style(self.border_style);
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}
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}
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// Corners
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if self.borders.contains(Borders::LEFT | Borders::TOP) {
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buf.get_mut(area.left(), area.top())
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.set_symbol(line::TOP_LEFT)
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.set_style(self.border_style);
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}
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if self.borders.contains(Borders::RIGHT | Borders::TOP) {
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buf.get_mut(area.right() - 1, area.top())
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.set_symbol(line::TOP_RIGHT)
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.set_style(self.border_style);
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}
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if self.borders.contains(Borders::LEFT | Borders::BOTTOM) {
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buf.get_mut(area.left(), area.bottom() - 1)
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.set_symbol(line::BOTTOM_LEFT)
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.set_style(self.border_style);
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}
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if self.borders.contains(Borders::RIGHT | Borders::BOTTOM) {
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buf.get_mut(area.right() - 1, area.bottom() - 1)
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.set_symbol(line::BOTTOM_RIGHT)
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.set_style(self.border_style);
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}
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if area.width > 2 {
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if let Some(title) = self.title {
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let lx = if self.borders.intersects(Borders::LEFT) {
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1
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} else {
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0
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};
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let rx = if self.borders.intersects(Borders::RIGHT) {
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1
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} else {
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0
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};
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let width = area.width - lx - rx;
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buf.set_stringn(
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area.left() + lx,
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area.top(),
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title,
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width as usize,
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self.title_style,
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);
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}
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}
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}
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}
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