bendns' repos / pattypan
small software-rendered rust tty
Diffstat (limited to 'src/term/cells.rs')
-rw-r--r--src/term/cells.rs57
1 files changed, 57 insertions, 0 deletions
diff --git a/src/term/cells.rs b/src/term/cells.rs
index c3ad862..707fe10 100644
--- a/src/term/cells.rs
+++ b/src/term/cells.rs
@@ -11,6 +11,7 @@ pub struct Style {
pub color: [u8; 3],
pub flags: u8,
}
+use std::cmp::Ordering;
use std::default::Default::default;
use std::fmt::Debug;
use std::iter::{empty, repeat, repeat_n};
@@ -76,6 +77,7 @@ impl Cells {
fn offset(&mut self) -> usize {
self.row as usize * self.size.0 as usize
}
+ #[track_caller]
pub fn cells(&mut self) -> &mut [Cell] {
let o = self.offset();
assert!(
@@ -124,6 +126,61 @@ impl Cells {
),
);
}
+
+ pub fn resize(&mut self, (c, r): (u16, u16)) {
+ let (c, r) = (c + 1, r + 1);
+ assert!(self.cells.len() % self.c() as usize == 0);
+ let (oc, or) = self.size;
+ self.size = (c, r);
+ self.margin.0 = self.margin.0.min(r);
+ self.margin.1 = self.margin.1.min(r);
+
+ match c.cmp(&oc) {
+ Ordering::Less => {
+ self.cells = self
+ .cells
+ .chunks_exact(oc as usize)
+ .flat_map(|chunk| &chunk[..c as usize])
+ .copied()
+ .collect::<Vec<_>>();
+ assert!(self.cells.len() % c as usize == 0);
+ }
+ Ordering::Equal => {}
+ Ordering::Greater => {
+ self.cells = self
+ .cells
+ .chunks_exact(oc as usize)
+ .flat_map(|chunk| {
+ chunk
+ .iter()
+ .copied()
+ .chain(repeat_n(default(), (c - oc) as usize))
+ })
+ .collect::<Vec<_>>();
+ assert!(self.cells.len() % c as usize == 0);
+ }
+ };
+ assert!(self.cells.len() % c as usize == 0);
+ match r.cmp(&or) {
+ Ordering::Less => {
+ self.row += (or - r) as usize;
+ }
+ Ordering::Equal => {}
+ Ordering::Greater => {
+ let d = self.row as isize - (r - or) as isize;
+ if d < 0 {
+ self.row = 0;
+ self.cells.extend(repeat_n(
+ Cell::default(),
+ d.abs() as usize * c as usize,
+ ));
+ } else {
+ self.row = d as usize;
+ }
+ }
+ }
+ self.cells();
+ }
pub fn insert_chars(&mut self, characters: u16, (x, y): (u16, u16)) {
let s = &mut self.row(y)[x as usize - 1..];
s.rotate_right(characters as usize);