File size: 5,101 Bytes
41a96ee | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | use crate::cell::Cell;
/// A line of terminal cells.
#[derive(Clone, Debug, Default, PartialEq)]
pub struct Line {
pub cells: Vec<Cell>,
pub dirty: bool,
pub wrapped: bool,
}
impl Line {
pub fn new(cols: usize) -> Self {
Self {
cells: vec![Cell::default(); cols],
dirty: false,
wrapped: false,
}
}
pub fn clear(&mut self) {
for cell in &mut self.cells {
cell.reset();
}
self.dirty = true;
self.wrapped = false;
}
pub fn resize(&mut self, cols: usize) {
if self.cells.len() < cols {
self.cells.resize(cols, Cell::default());
} else if self.cells.len() > cols {
self.cells.truncate(cols);
}
}
}
/// Terminal grid with scrollback buffer.
pub struct Grid {
pub lines: Vec<Line>,
pub scrollback: Vec<Line>,
pub cols: usize,
pub rows: usize,
pub scrollback_limit: usize,
pub cursor_row: usize,
pub cursor_col: usize,
pub saved_cursor_row: usize,
pub saved_cursor_col: usize,
pub top_margin: usize,
pub bottom_margin: usize,
}
impl Grid {
pub fn new(cols: usize, rows: usize, scrollback_limit: usize) -> Self {
Self {
lines: (0..rows).map(|_| Line::new(cols)).collect(),
scrollback: Vec::new(),
cols,
rows,
scrollback_limit,
cursor_row: 0,
cursor_col: 0,
saved_cursor_row: 0,
saved_cursor_col: 0,
top_margin: 0,
bottom_margin: rows.saturating_sub(1),
}
}
pub fn resize(&mut self, cols: usize, rows: usize) {
let old_rows = self.lines.len();
for line in &mut self.lines {
line.resize(cols);
}
if rows > old_rows {
self.lines.reserve(rows - old_rows);
for _ in old_rows..rows {
self.lines.push(Line::new(cols));
}
} else if rows < old_rows {
let excess = old_rows - rows;
let limit = self.scrollback_limit;
for line in self.lines.drain(0..excess) {
if self.scrollback.len() >= limit {
self.scrollback.remove(0);
}
self.scrollback.push(line);
}
}
self.cols = cols;
self.rows = rows;
self.cursor_row = self.cursor_row.min(rows.saturating_sub(1));
self.cursor_col = self.cursor_col.min(cols.saturating_sub(1));
self.top_margin = 0;
self.bottom_margin = rows.saturating_sub(1);
}
pub fn clear_screen(&mut self) {
for line in &mut self.lines {
line.clear();
}
}
pub fn clear_line(&mut self, row: usize) {
if let Some(line) = self.lines.get_mut(row) {
line.clear();
}
}
pub fn clear_line_right(&mut self, row: usize, col: usize) {
if let Some(line) = self.lines.get_mut(row) {
for cell in &mut line.cells[col..] {
cell.reset();
}
line.dirty = true;
}
}
pub fn clear_line_left(&mut self, row: usize, col: usize) {
if let Some(line) = self.lines.get_mut(row) {
for cell in &mut line.cells[..=col] {
cell.reset();
}
line.dirty = true;
}
}
pub fn scroll_up(&mut self, n: usize) {
let top = self.top_margin;
let bottom = self.bottom_margin;
let n = n.min(bottom.saturating_sub(top) + 1);
for _ in 0..n {
let removed = self.lines.remove(top);
if top == 0 && self.scrollback.len() < self.scrollback_limit {
self.scrollback.push(removed);
}
let mut new_line = Line::new(self.cols);
new_line.dirty = true;
self.lines.insert(bottom, new_line);
}
for i in top..=bottom {
if let Some(line) = self.lines.get_mut(i) {
line.dirty = true;
}
}
}
pub fn scroll_down(&mut self, n: usize) {
let top = self.top_margin;
let bottom = self.bottom_margin;
let n = n.min(bottom.saturating_sub(top) + 1);
for _ in 0..n {
self.lines.remove(bottom);
let mut new_line = Line::new(self.cols);
new_line.dirty = true;
self.lines.insert(top, new_line);
}
for i in top..=bottom {
if let Some(line) = self.lines.get_mut(i) {
line.dirty = true;
}
}
}
pub fn line(&self, row: usize) -> Option<&Line> {
self.lines.get(row)
}
pub fn line_mut(&mut self, row: usize) -> Option<&mut Line> {
self.lines.get_mut(row)
}
pub fn cell(&self, row: usize, col: usize) -> Option<&Cell> {
self.lines.get(row)?.cells.get(col)
}
pub fn cell_mut(&mut self, row: usize, col: usize) -> Option<&mut Cell> {
self.lines.get_mut(row)?.cells.get_mut(col)
}
}
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