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grid: scrollback with mouse-wheel and Shift+PageUp scrolling

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Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I12b2ed33a705eb3474a7d14a295e021d6a6a6964
This commit is contained in:
raf 2026-06-24 14:59:05 +03:00
commit 3dd953b75a
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GPG key ID: 29D95B64378DB4BF
4 changed files with 201 additions and 20 deletions
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16
src/render.rs
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@ -126,12 +126,14 @@ impl Renderer {
canvas.clear(DEFAULT_BG);
let m = self.fonts.metrics();
let cols = grid.cols();
// Cell backgrounds: only paint cells that differ from the cleared
// default - most of a screen is default background.
// default - most of a screen is default background. Rows come through
// the scrollback viewport and may be shorter than `cols` after a resize.
for y in 0..grid.rows() {
for x in 0..grid.cols() {
let (_, bg) = cell_colors(grid.cell(x, y));
for (x, cell) in grid.view_row(y).iter().take(cols).enumerate() {
let (_, bg) = cell_colors(cell);
if bg != DEFAULT_BG {
let (px, py) = (x as i32 * m.width as i32, y as i32 * m.height as i32);
canvas.fill_rect(px, py, m.width, m.height, bg);
@ -140,8 +142,7 @@ impl Renderer {
}
for y in 0..grid.rows() {
for x in 0..grid.cols() {
let cell = grid.cell(x, y);
for (x, cell) in grid.view_row(y).iter().take(cols).enumerate() {
if cell.flags.contains(Flags::WIDE_CONT) {
continue;
}
@ -162,7 +163,10 @@ impl Renderer {
}
}
self.draw_cursor(&mut canvas, grid, m, focused);
// The cursor belongs to the live screen; hide it while scrolled back.
if grid.view_at_bottom() {
self.draw_cursor(&mut canvas, grid, m, focused);
}
}
/// Draw the cursor: a solid block/underline/beam when focused, a hollow