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mod anim;
mod img;
mod view;
use std::path::Path;
use anim::{Animator, RequestNextFrame};
use view::{ImageView, ViewOpts};
use winit::{
event::{ElementState, Event, KeyEvent, WindowEvent},
event_loop::{EventLoopBuilder, EventLoopProxy},
keyboard::{KeyCode, PhysicalKey},
window::{Window, WindowBuilder, WindowLevel},
};
struct Viewer {
view: ImageView,
#[allow(unused)]
animator: Option<Animator>,
}
impl Viewer {
fn new(
path: &Path,
window: &Window,
proxy: &EventLoopProxy<RequestNextFrame>,
opts: ViewOpts,
) -> anyhow::Result<Self> {
let view = ImageView::new(path, window, opts)?;
let animator = view
.image
.delays()
.map(|delays| Animator::new(proxy.clone(), delays));
Ok(Self { view, animator })
}
}
impl std::ops::DerefMut for Viewer {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.view
}
}
impl std::ops::Deref for Viewer {
type Target = ImageView;
fn deref(&self) -> &Self::Target {
&self.view
}
}
pub fn run<P: AsRef<Path>>(
title: &str,
image_paths: &[P],
max_side: Option<u32>,
) -> anyhow::Result<()> {
if let Some(image_path) = image_paths.first() {
let event_loop = EventLoopBuilder::<RequestNextFrame>::with_user_event()
.build()
.expect("Failed to create event loop");
let proxy = event_loop.create_proxy();
// Note: For Wayland positioning has to happen via the window manager.
let window = WindowBuilder::new()
.with_title(title)
.with_resizable(true)
.with_decorations(false)
.with_window_level(WindowLevel::AlwaysOnTop)
.build(&event_loop)
.unwrap();
let mut index: usize = 0;
let label = format!(
"{} {}/{}",
image_path.as_ref().display(),
index + 1,
image_paths.len()
);
let mut image_view = Viewer::new(
image_path.as_ref(),
&window,
&proxy,
ViewOpts {
max_side,
resize_window: true,
show_label: false,
label,
},
)?;
event_loop.run(move |event, target| {
match event {
// Go to the next frame in a sequence.
Event::UserEvent(RequestNextFrame) => {
if !image_view.advance() {
target.exit();
}
}
Event::WindowEvent {
event: WindowEvent::RedrawRequested,
..
} => {
if !image_view.draw() {
target.exit();
}
}
Event::WindowEvent {
event: WindowEvent::Resized(size),
..
} => {
image_view.resize(size.width, size.height, true).unwrap();
}
_ => {
if let Some(action) = handle_event(event) {
match action {
Action::ToggleFullscreen => toggle_fullscreen(&window),
Action::ZoomIn => image_view.zoom_in(),
Action::ZoomOut => image_view.zoom_out(),
Action::PanUp => image_view.pan_up(),
Action::PanDown => image_view.pan_down(),
Action::PanRight => image_view.pan_right(),
Action::PanLeft => image_view.pan_left(),
Action::ToggleInfo => image_view.toggle_label(),
Action::ChangeImage(next) => {
index = if next {
if index >= image_paths.len() - 1 {
0
} else {
index + 1
}
} else {
if index == 0 {
image_paths.len() - 1
} else {
index.saturating_sub(1)
}
};
if let Some(image_path) = image_paths.get(index) {
let label = format!(
"{} {}/{}",
image_path.as_ref().display(),
index + 1,
image_paths.len()
);
// Because by this point the WM has already positioned
// the window, it's better to resize the image to the window
// rather than vice-versa, because otherwise the window
// positioning could get messed up.
let view = Viewer::new(
image_path.as_ref(),
&window,
&proxy,
ViewOpts {
max_side,
resize_window: false,
show_label: image_view.is_label_visible(),
label,
},
);
match view {
Ok(view) => image_view = view,
Err(err) => eprintln!("Error loading image: {err}"),
}
} else {
eprintln!("No image found for index {index}")
}
}
Action::Quit => target.exit(),
}
}
}
}
})?;
}
Ok(())
}
enum Action {
ToggleFullscreen,
ZoomIn,
ZoomOut,
PanUp,
PanDown,
PanRight,
PanLeft,
ToggleInfo,
ChangeImage(bool),
Quit,
}
fn handle_event(event: Event<RequestNextFrame>) -> Option<Action> {
match event {
Event::WindowEvent {
event:
WindowEvent::KeyboardInput {
event:
KeyEvent {
state: ElementState::Pressed,
physical_key: PhysicalKey::Code(key),
..
},
..
},
..
} => match key {
KeyCode::KeyF => Some(Action::ToggleFullscreen),
KeyCode::KeyE => Some(Action::ZoomIn),
KeyCode::KeyH => Some(Action::ZoomOut),
KeyCode::ArrowUp => Some(Action::PanUp),
KeyCode::ArrowDown => Some(Action::PanDown),
KeyCode::ArrowRight => Some(Action::PanRight),
KeyCode::ArrowLeft => Some(Action::PanLeft),
KeyCode::Quote => Some(Action::ChangeImage(true)),
KeyCode::Comma => Some(Action::ChangeImage(false)),
KeyCode::KeyI => Some(Action::ToggleInfo),
KeyCode::Escape | KeyCode::KeyQ => Some(Action::Quit),
_ => None,
},
Event::WindowEvent {
event: WindowEvent::CloseRequested,
..
} => Some(Action::Quit),
_ => None,
}
}
fn toggle_fullscreen(window: &Window) {
if window.fullscreen().is_some() {
window.set_fullscreen(None);
} else {
let monitor = window.current_monitor().unwrap();
let fullscreen = winit::window::Fullscreen::Borderless(Some(monitor));
window.set_fullscreen(Some(fullscreen));
}
}