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Set output rows based on window size

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This commit is contained in:
Camden Dixie O'Brien
2026-03-02 15:49:21 +00:00
parent 67b67c2505
commit 53171df913
1 changed files with 29 additions and 4 deletions
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33
emu.js
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@@ -13,7 +13,6 @@ const PERIPHS_SIZE = 69; // Nice
const POLL_INTERVAL_MS = 20;
const COLS = 80;
const ROWS = 36;
const TAB_WIDTH = 8;
const CURSOR_IDLE_TIME_MS = 1000;
@@ -36,8 +35,9 @@ class Emulator {
this.rx_queue = [];
this.timer = setInterval(() => this.poll(), POLL_INTERVAL_MS);
this.rows = this.max_rows();
this.grid = Array.from(
{ length: ROWS },
{ length: this.rows },
() => new Array(COLS).fill(' '));
this.cursor = { x: 0, y: 0 };
this.range = {
@@ -47,6 +47,7 @@ class Emulator {
this.idle_timer = null;
this.input_enable = false;
document.addEventListener('keydown', (e) => this.handle_keydown(e));
window.addEventListener('resize', () => this.handle_resize());
this.worker = new Worker('boot.js');
this.worker.postMessage(this.mem);
@@ -142,7 +143,7 @@ class Emulator {
this.cursor_move(1, 0);
} else if (e.key == 'Enter') {
this.cursor.y = this.range.end.y + 1;
if (this.cursor.y >= ROWS)
while (this.cursor.y >= this.rows)
this.scroll();
this.cursor.x = 0;
this.submit_line();
@@ -228,7 +229,7 @@ class Emulator {
next_cell(cell) {
if (cell.x < COLS - 1)
return { x: cell.x + 1, y: cell.y };
else if (cell.y < ROWS - 1)
else if (cell.y < this.rows - 1)
return { x: 0, y: cell.y + 1 };
else
return null;
@@ -295,6 +296,30 @@ class Emulator {
this.range.start.y -= 1;
this.range.end.y -= 1;
}
max_rows() {
const style = getComputedStyle(this.output);
const line_height = parseFloat(style.lineHeight);
const margin_top = parseFloat(style.marginTop);
const margin_bottom = parseFloat(style.marginBottom);
const viewport_height = window.innerHeight;
const output_height = viewport_height - margin_top - margin_bottom;
return Math.floor(output_height / line_height) - 1;
}
handle_resize() {
this.rows = this.max_rows();
while (this.grid.length < this.rows)
this.grid.push(new Array(COLS).fill(' '));
while (this.grid.length > this.rows) {
this.grid.shift()
this.cursor.y -= 1;
this.range.start.y -= 1;
this.range.end.y -= 1;
}
this.flush_output();
}
}
window.addEventListener('DOMContentLoaded', () => {