89 lines
3.1 KiB
Rust
89 lines
3.1 KiB
Rust
use crate::send;
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use color_eyre::{Help, Report};
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use glib::Continue;
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use gtk::ffi::GTK_STYLE_PROVIDER_PRIORITY_USER;
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use gtk::prelude::CssProviderExt;
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use gtk::{gdk, gio, CssProvider, StyleContext};
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use notify::event::ModifyKind;
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use notify::{recommended_watcher, Event, EventKind, RecursiveMode, Result, Watcher};
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use std::path::PathBuf;
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use std::time::Duration;
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use tokio::spawn;
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use tokio::time::sleep;
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use tracing::{debug, error, info};
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/// Attempts to load CSS file at the given path
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/// and attach if to the current GTK application.
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///
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/// Installs a file watcher and reloads CSS when
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/// write changes are detected on the file.
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pub fn load_css(style_path: PathBuf) {
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let provider = CssProvider::new();
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match provider.load_from_file(&gio::File::for_path(&style_path)) {
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Ok(()) => debug!("Loaded css from '{}'", style_path.display()),
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Err(err) => error!("{:?}", Report::new(err)
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.wrap_err("Failed to load CSS")
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.suggestion("Check the CSS file for errors")
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.suggestion("GTK CSS uses a subset of the full CSS spec and many properties are not available. Ensure you are not using any unsupported property.")
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)
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};
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let screen = gdk::Screen::default().expect("Failed to get default GTK screen");
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StyleContext::add_provider_for_screen(
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&screen,
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&provider,
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GTK_STYLE_PROVIDER_PRIORITY_USER as u32,
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);
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let (tx, rx) = glib::MainContext::channel(glib::PRIORITY_DEFAULT);
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spawn(async move {
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let style_path2 = style_path.clone();
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let mut watcher = recommended_watcher(move |res: Result<Event>| match res {
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Ok(event) if matches!(event.kind, EventKind::Modify(ModifyKind::Data(_))) => {
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debug!("{event:?}");
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if event
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.paths
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.first()
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.map(|p| p == &style_path2)
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.unwrap_or_default()
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{
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send!(tx, style_path2.clone());
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}
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}
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Err(e) => error!("Error occurred when watching stylesheet: {:?}", e),
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_ => {}
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})
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.expect("Failed to create CSS file watcher");
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let dir_path = style_path.parent().expect("to exist");
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watcher
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.watch(dir_path, RecursiveMode::NonRecursive)
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.expect("Failed to start CSS file watcher");
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debug!("Installed CSS file watcher on '{}'", style_path.display());
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// avoid watcher from dropping
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loop {
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sleep(Duration::from_secs(1)).await;
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}
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});
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{
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rx.attach(None, move |path| {
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info!("Reloading CSS");
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if let Err(err) = provider
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.load_from_file(&gio::File::for_path(path)) {
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error!("{:?}", Report::new(err)
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.wrap_err("Failed to load CSS")
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.suggestion("Check the CSS file for errors")
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.suggestion("GTK CSS uses a subset of the full CSS spec and many properties are not available. Ensure you are not using any unsupported property.")
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);
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}
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Continue(true)
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});
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}
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}
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