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add up/down/forward/backward scroll commands

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This commit is contained in:
alice pellerin
2026-03-17 00:12:36 -05:00
parent ce19c3eb9c
commit 813e48920c
2 changed files with 38 additions and 4 deletions
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src/app/mod.rs
+37 -3
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@@ -1,5 +1,5 @@
use std::{cmp::min, env, fs::File, io::Read, process::exit};
use crossterm::event::{self, Event, KeyCode, KeyModifiers};
use crossterm::{event::{self, Event, KeyCode, KeyModifiers}, terminal::window_size};
use crate::{BYTES_PER_LINE, cursor::Cursor};
@@ -8,6 +8,7 @@ mod widget;
#[derive(Debug)]
pub struct App {
pub contents: Vec<u8>,
pub window_rows: u16,
pub scroll_position: usize,
pub cursor: Cursor,
pub should_quit: bool
@@ -32,27 +33,60 @@ impl App {
Self {
contents,
window_rows: window_size().unwrap().rows,
scroll_position: 0,
cursor: Cursor::default(),
should_quit: false
}
}
#[allow(clippy::too_many_lines)]
pub fn handle_events(&mut self) {
#[allow(clippy::collapsible_match)]
match event::read().unwrap() {
Event::Resize(_, height) => {
self.window_rows = height;
}
Event::Key(key_event) if key_event.code == KeyCode::Char('q') => {
self.should_quit = true;
}
Event::Key(key_event) if key_event.modifiers.contains(KeyModifiers::CONTROL) &&
key_event.code == KeyCode::Char('e') => {
let max_scroll_position = self.contents.len() - 0x50;
self.scroll_position = min(self.scroll_position + BYTES_PER_LINE, max_scroll_position);
self.scroll_position = min(
self.scroll_position + BYTES_PER_LINE,
self.contents.len() - (5 * BYTES_PER_LINE)
);
}
Event::Key(key_event) if key_event.modifiers.contains(KeyModifiers::CONTROL) &&
key_event.code == KeyCode::Char('y') => {
self.scroll_position = self.scroll_position.saturating_sub(BYTES_PER_LINE);
}
Event::Key(key_event) if key_event.modifiers.contains(KeyModifiers::CONTROL) &&
key_event.code == KeyCode::Char('d') => {
self.scroll_position = min(
self.scroll_position + ((self.window_rows / 2) as usize * BYTES_PER_LINE),
self.contents.len() - (5 * BYTES_PER_LINE)
);
}
Event::Key(key_event) if key_event.modifiers.contains(KeyModifiers::CONTROL) &&
key_event.code == KeyCode::Char('u') => {
self.scroll_position = self.scroll_position.saturating_sub(
(self.window_rows / 2) as usize * BYTES_PER_LINE
);
}
Event::Key(key_event) if key_event.modifiers.contains(KeyModifiers::CONTROL) &&
key_event.code == KeyCode::Char('f') => {
self.scroll_position = min(
self.scroll_position + (self.window_rows as usize * BYTES_PER_LINE),
self.contents.len() - (5 * BYTES_PER_LINE)
);
}
Event::Key(key_event) if key_event.modifiers.contains(KeyModifiers::CONTROL) &&
key_event.code == KeyCode::Char('b') => {
self.scroll_position = self.scroll_position.saturating_sub(
self.window_rows as usize * BYTES_PER_LINE
);
}
Event::Key(key_event) if key_event.code == KeyCode::Char('i') => {
if self.cursor.head >= 0x10 {
self.cursor.head -= 0x10;