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use crossterm::{
cursor::MoveTo,
event::{self, Event, KeyCode, KeyEvent, KeyEventKind, KeyModifiers},
execute, queue,
style::Print,
terminal::{Clear, ClearType, disable_raw_mode, enable_raw_mode},
};
use rasteroid::image_extended::ZoomPanViewport;
use std::{
io::{self, Write},
time::Duration,
};
pub fn show_help_prompt(
out: &mut impl Write,
term_width: u16,
term_height: u16,
state: &ZoomPanViewport,
current_image: u8,
max_images: u8,
) -> io::Result<()> {
let current_image = current_image + 1; // 0 based inex to 1
let help_text =
"[Arrow/hjkl] Move [n/p] Next/Pre [g/G] Start/End [+/-] Zoom [0] Reset [q/ESC] Quit";
let status_text = format!(
"Position: ({}, {}) | Zoom: {}x | image: {current_image}/{max_images}",
state.pan_x(),
state.pan_y(),
state.zoom()
);
// Calculate positions (bottom of screen)
let separator_line = 2; // Lines reserved for status/help
let status_line = term_height.saturating_sub(separator_line);
let help_line = term_height.saturating_sub(1);
// Center the text horizontally
let help_pos = term_width.saturating_sub(help_text.len() as u16) / 2;
let status_pos = term_width.saturating_sub(status_text.len() as u16) / 2;
// Add separator line
execute!(
out,
MoveTo(0, status_line.saturating_sub(1)),
Print(format!("{:━^width$}", "", width = term_width as usize)),
)?;
// Write status text
execute!(out, MoveTo(status_pos, status_line), Print(&status_text),)?;
// Write help text
execute!(out, MoveTo(help_pos, help_line), Print(&help_text),)?;
Ok(())
}
pub fn clear_screen(
stdout: &mut impl std::io::Write,
addon: Option<Vec<u8>>,
) -> std::io::Result<()> {
let mut buffer: Vec<u8> = Vec::new();
queue!(buffer, Clear(ClearType::All), MoveTo(0, 0))?;
if let Some(val) = addon {
buffer.extend_from_slice(&val);
}
stdout.write_all(&buffer)?;
Ok(())
}
pub fn run_interactive_viewer(
container_width: u32,
container_height: u32,
image_width: u32,
image_height: u32,
max_images: u8,
mut callback: impl FnMut(&mut ZoomPanViewport, u8) -> Option<()>,
) -> std::io::Result<()> {
enable_raw_mode()?;
let mut viewport =
ZoomPanViewport::new(container_width, container_height, image_width, image_height);
let mut current_image = 0;
// Initial callback
let mut should_quit = callback(&mut viewport, current_image);
let mut last_callback_time = std::time::Instant::now();
let callback_throttle = std::time::Duration::from_millis(50);
while should_quit.is_some() {
if event::poll(Duration::from_millis(16))? {
// ~60fps
if let Event::Key(key) = event::read()? {
if key.kind == KeyEventKind::Release {
continue;
}
let mut clicked_correct_key = false;
match key {
// Quit (q or ESC)
KeyEvent {
code: KeyCode::Char('q'),
modifiers: KeyModifiers::NONE,
..
}
| KeyEvent {
code: KeyCode::Esc, ..
} => break,
// next image
KeyEvent {
code: KeyCode::Char('n'),
modifiers: KeyModifiers::NONE,
..
} => {
if current_image + 1 < max_images {
clicked_correct_key = true;
current_image += 1;
}
}
// previous image
KeyEvent {
code: KeyCode::Char('p'),
modifiers: KeyModifiers::NONE,
..
} => {
if current_image != 0 {
clicked_correct_key = true;
current_image -= 1;
}
}
//left
KeyEvent {
code: KeyCode::Left,
..
}
| KeyEvent {
code: KeyCode::Char('h'),
modifiers: KeyModifiers::NONE,
..
} => {
if viewport.adjust_pan(-50, 0) {
clicked_correct_key = true;
}
}
// right
KeyEvent {
code: KeyCode::Right,
modifiers: KeyModifiers::NONE,
..
}
| KeyEvent {
code: KeyCode::Char('l'),
modifiers: KeyModifiers::NONE,
..
} => {
if viewport.adjust_pan(50, 0) {
clicked_correct_key = true;
}
}
// up
KeyEvent {
code: KeyCode::Up,
modifiers: KeyModifiers::NONE,
..
}
| KeyEvent {
code: KeyCode::Char('k'),
modifiers: KeyModifiers::NONE,
..
} => {
if viewport.adjust_pan(0, -50) {
clicked_correct_key = true;
}
}
// down
KeyEvent {
code: KeyCode::Down,
modifiers: KeyModifiers::NONE,
..
}
| KeyEvent {
code: KeyCode::Char('j'),
modifiers: KeyModifiers::NONE,
..
} => {
if viewport.adjust_pan(0, 50) {
clicked_correct_key = true;
}
}
// stronger up
KeyEvent {
code: KeyCode::Char('u'),
modifiers: KeyModifiers::CONTROL,
..
} => {
if viewport.adjust_pan(0, -200) {
clicked_correct_key = true;
}
}
// stronger down
KeyEvent {
code: KeyCode::Char('d'),
modifiers: KeyModifiers::CONTROL,
..
} => {
if viewport.adjust_pan(0, 200) {
clicked_correct_key = true;
}
}
// Zoom (+, - or =)
KeyEvent {
code: KeyCode::Char('+'),
modifiers: KeyModifiers::NONE,
..
}
| KeyEvent {
code: KeyCode::Char('='),
modifiers: KeyModifiers::NONE,
..
} => {
clicked_correct_key = true;
viewport.set_zoom(viewport.zoom() + 1);
}
KeyEvent {
code: KeyCode::Char('-'),
modifiers: KeyModifiers::NONE,
..
} => {
if viewport.zoom() > 1 {
clicked_correct_key = true;
viewport.set_zoom(viewport.zoom() - 1);
}
}
KeyEvent {
code: KeyCode::Char('g'),
modifiers: KeyModifiers::NONE,
..
} => {
let (_, _, y, _) = viewport.get_pan_limits();
if viewport.pan_y() != y {
clicked_correct_key = true;
viewport.set_pan(viewport.pan_x(), y);
}
}
KeyEvent {
code: KeyCode::Char('G'),
modifiers: KeyModifiers::SHIFT,
..
} => {
let (_, _, _, y) = viewport.get_pan_limits();
if viewport.pan_y() != y {
clicked_correct_key = true;
viewport.set_pan(viewport.pan_x(), y);
}
}
// Reset (0)
KeyEvent {
code: KeyCode::Char('0'),
modifiers: KeyModifiers::NONE,
..
} => {
clicked_correct_key = true;
viewport.set_zoom(1);
viewport.set_pan(0, 0);
}
_ => {}
}
// Callback after each key press, but throttled
if clicked_correct_key {
let now = std::time::Instant::now();
if now.duration_since(last_callback_time) >= callback_throttle {
should_quit = callback(&mut viewport, current_image);
last_callback_time = now;
}
}
}
}
}
disable_raw_mode()?;
Ok(())
}