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//! Functions for computing properties of the terminal grid
use std::ops::{Index, IndexMut, Deref, DerefMut, Range, RangeTo, RangeFrom};
use std::slice::{Iter, IterMut};
use util::Rotate;
use term::{Cursor, DEFAULT_FG, DEFAULT_BG};
use ::Rgb;
/// Calculate the number of cells for an axis
pub fn num_cells_axis(cell_width: u32, screen_width: u32) -> u32 {
(screen_width as f64 / cell_width as f64) as u32
}
#[derive(Clone, Debug)]
pub struct Cell {
pub c: char,
pub fg: Rgb,
pub bg: Rgb,
pub flags: CellFlags,
}
bitflags! {
pub flags CellFlags: u32 {
const INVERSE = 0b00000001,
const BOLD = 0b00000010,
const ITALIC = 0b00000100,
const UNDERLINE = 0b00001000,
}
}
impl Cell {
pub fn new(c: char) -> Cell {
Cell {
c: c.into(),
bg: Default::default(),
fg: Default::default(),
flags: CellFlags::empty(),
}
}
pub fn reset(&mut self) {
self.c = ' ';
self.flags = CellFlags::empty();
// FIXME shouldn't know about term
self.bg = DEFAULT_BG;
self.fg = DEFAULT_FG;
}
}
/// Represents the terminal display contents
#[derive(Clone)]
pub struct Grid {
/// Rows in the grid. Each row holds a list of cells corresponding to the columns in that row.
raw: Vec<Row>,
/// Number of columns
cols: usize,
/// Number of rows.
///
/// Invariant: rows is equivalent to cells.len()
rows: usize,
}
impl Grid {
pub fn new(rows: usize, cols: usize) -> Grid {
let mut raw = Vec::with_capacity(rows);
for _ in 0..rows {
raw.push(Row::new(cols));
}
Grid {
raw: raw,
cols: cols,
rows: rows,
}
}
#[inline]
pub fn rows(&self) -> Iter<Row> {
self.raw.iter()
}
#[inline]
pub fn rows_mut(&mut self) -> IterMut<Row> {
self.raw.iter_mut()
}
#[inline]
pub fn num_rows(&self) -> usize {
self.raw.len()
}
#[inline]
pub fn num_cols(&self) -> usize {
self.raw[0].len()
}
pub fn scroll(&mut self, region: Range<usize>, positions: isize) {
self.raw[region].rotate(positions)
}
#[inline]
pub fn clear(&mut self) {
let region = 0..self.num_rows();
self.clear_region(region);
}
pub fn clear_region(&mut self, region: Range<usize>) {
for row in self.raw[region].iter_mut() {
for cell in row.iter_mut() {
cell.reset();
}
}
}
}
impl Index<usize> for Grid {
type Output = Row;
#[inline]
fn index<'a>(&'a self, index: usize) -> &'a Row {
&self.raw[index]
}
}
impl IndexMut<usize> for Grid {
#[inline]
fn index_mut<'a>(&'a mut self, index: usize) -> &'a mut Row {
&mut self.raw[index]
}
}
impl Index<Cursor> for Grid {
type Output = Cell;
#[inline]
fn index<'a>(&'a self, cursor: Cursor) -> &'a Cell {
&self.raw[cursor.y as usize][cursor.x as usize]
}
}
impl IndexMut<Cursor> for Grid {
#[inline]
fn index_mut<'a>(&'a mut self, cursor: Cursor) -> &'a mut Cell {
&mut self.raw[cursor.y as usize][cursor.x as usize]
}
}
/// A row in the grid
#[derive(Debug, Clone)]
pub struct Row(Vec<Cell>);
impl Row {
pub fn new(columns: usize) -> Row {
Row(vec![Cell::new(' '); columns])
}
pub fn cells(&self) -> Iter<Cell> {
self.0.iter()
}
pub fn cells_mut(&mut self) -> IterMut<Cell> {
self.0.iter_mut()
}
}
impl Deref for Row {
type Target = Vec<Cell>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl DerefMut for Row {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl Index<usize> for Row {
type Output = Cell;
#[inline]
fn index<'a>(&'a self, index: usize) -> &'a Cell {
&self.0[index]
}
}
impl IndexMut<usize> for Row {
#[inline]
fn index_mut<'a>(&'a mut self, index: usize) -> &'a mut Cell {
&mut self.0[index]
}
}
impl Index<RangeFrom<usize>> for Row {
type Output = [Cell];
#[inline]
fn index<'a>(&'a self, index: RangeFrom<usize>) -> &'a [Cell] {
&self.0[index]
}
}
impl IndexMut<RangeFrom<usize>> for Row {
#[inline]
fn index_mut<'a>(&'a mut self, index: RangeFrom<usize>) -> &'a mut [Cell] {
&mut self.0[index]
}
}
impl Index<RangeTo<usize>> for Row {
type Output = [Cell];
#[inline]
fn index<'a>(&'a self, index: RangeTo<usize>) -> &'a [Cell] {
&self.0[index]
}
}
impl IndexMut<RangeTo<usize>> for Row {
#[inline]
fn index_mut<'a>(&'a mut self, index: RangeTo<usize>) -> &'a mut [Cell] {
&mut self.0[index]
}
}
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