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use crate::{
event::Event,
style::{Style, StyleMask},
terminal::{Clear, Terminal},
};
use ndarray::prelude::*;
use num::ToPrimitive;
use std::io::{Result, Write};
use itertools::izip;
pub struct Screen {
terminal: Terminal,
buffer: Array2<Cell>,
cursor_hidden: bool,
}
#[derive(Debug, Clone)]
struct Cell {
character: char,
style: Style,
dirty: bool,
}
impl Default for Cell {
fn default() -> Self {
Self {
character: ' ',
style: Style::default(),
dirty: false,
}
}
}
impl Screen {
pub fn open() -> Result<Self> {
let mut terminal = Terminal::new()?;
let (rows, cols) = terminal.size()?;
let (rows, cols) = (rows.into(), cols.into());
let buffer = Array::from_elem((rows, cols), Cell::default());
terminal.enable_raw_mode()?;
terminal.enable_mouse_events()?;
terminal.show_alternate_screen()?;
terminal.flush()?;
Ok(Self {
terminal,
buffer,
cursor_hidden: false,
})
}
pub fn close(self) {}
pub fn size(&self) -> (usize, usize) {
(self.buffer.nrows(), self.buffer.ncols())
}
pub fn listen(&mut self) -> Result<Event> {
self.terminal.listen()
}
pub fn hide_cursor(&mut self) -> Result<()> {
self.terminal.hide_cursor()?;
self.terminal.flush()?;
self.cursor_hidden = true;
Ok(())
}
pub fn put(&mut self, row: u16, col: u16, style: Style, character: char) {
if let Some(cell) = self.buffer.get_mut((row.into(), col.into())) {
if cell.style != style || cell.character != character {
*cell = Cell {
character,
style,
dirty: true,
};
}
}
}
pub fn clear(&mut self) -> Result<()> {
self.terminal.clear(Clear::EntireScreen)?;
self.buffer.fill(Cell::default());
Ok(())
}
pub fn clear_row(&mut self, row: u16) {
for i in 0..self.buffer.ncols() {
self.put(row, i.to_u16().unwrap(), Style::default(), ' ');
}
}
pub fn put_str(&mut self, row: u16, col: u16, style: Style, string: &str) {
for (i, character) in string.chars().enumerate() {
self.put(row, col + i.to_u16().unwrap(), style.clone(), character);
}
}
pub fn flush(&mut self) -> Result<()> {
self.resize_if_necessary()?;
self.terminal.save_cursor_position()?;
if !self.cursor_hidden {
self.terminal.hide_cursor()?;
}
let mut previous_cell_pos = None;
for ((row, col), cell) in self.buffer.indexed_iter_mut() {
if !cell.dirty {
continue;
}
match previous_cell_pos {
None => {
self.terminal
.set_cursor_position(row.to_u16().unwrap(), col.to_u16().unwrap())?;
}
Some((_, previous_col)) if previous_col + 1 != col => {
self.terminal
.set_cursor_position(row.to_u16().unwrap(), col.to_u16().unwrap())?;
}
_ => {}
};
self.terminal.reset_style()?;
self.terminal
.set_background_color(cell.style.background_color)?;
self.terminal
.set_foreground_color(cell.style.foreground_color)?;
if cell.style.style_mask.contains(StyleMask::BOLD) {
self.terminal.set_bold()?;
}
if cell.style.style_mask.contains(StyleMask::FAINT) {
self.terminal.set_faint()?;
}
if cell.style.style_mask.contains(StyleMask::ITALIC) {
self.terminal.set_italic()?;
}
if cell.style.style_mask.contains(StyleMask::UNDERLINE) {
self.terminal.set_underline()?;
}
if cell.style.style_mask.contains(StyleMask::STRIKETHROUGH) {
self.terminal.set_strikethrough()?;
}
write!(self.terminal, "{}", cell.character)?;
cell.dirty = false;
previous_cell_pos = Some((row, col));
}
self.terminal.restore_cursor_position()?;
if !self.cursor_hidden {
self.terminal.show_cursor()?;
}
self.terminal.flush()?;
Ok(())
}
fn resize_if_necessary(&mut self) -> Result<()> {
let (new_rows, new_cols) = self.terminal.size()?;
let (new_rows, new_cols) = (new_rows.into(), new_cols.into());
if self.buffer.nrows() != new_rows || self.buffer.ncols() != new_cols {
self.terminal.clear(Clear::EntireScreen)?;
self.terminal.flush()?;
let old_rows = self.buffer.nrows();
let old_cols = self.buffer.ncols();
let mut new_buffer = Array::from_elem((new_rows, new_cols), Cell::default());
let common_rows = new_rows.min(old_rows);
let common_cols = new_cols.min(old_cols);
for (new, old) in izip!(
new_buffer.slice_mut(s![0..common_rows, 0..common_cols]),
self.buffer.slice(s![0..common_rows, 0..common_cols]),
) {
*new = Cell {
style: old.style.clone(),
character: old.character,
dirty: true,
}
}
self.buffer = new_buffer;
}
Ok(())
}
}
impl Drop for Screen {
fn drop(&mut self) {
self.terminal.hide_alternate_screen().unwrap();
self.terminal.disable_mouse_events().unwrap();
self.terminal.flush().unwrap();
}
}