feat: init function, & refactor for features

src/lib.rs

@@ -3,6 +3,56 @@ mod deref_cell;
 pub mod wayland;
 #[cfg(feature = "layer-shell")]
 mod wayland_custom_surface;
+#[cfg(feature = "x")]
 pub mod x;
 
+use adw::StyleManager;
+#[cfg(feature = "widgets")]
 pub use libcosmic_widgets as widgets;
+
+use gtk4::{gdk, gio::{self, FileMonitorFlags, FileMonitorEvent, FileMonitor}, glib, prelude::*};
+
+pub fn init() -> Option<FileMonitor> {
+    let _ = gtk4::init();
+    adw::init();
+
+    let user_provider = gtk4::CssProvider::new();
+    if let Some(display) = gdk::Display::default() {
+        gtk4::StyleContext::add_provider_for_display(
+            &display,
+            &user_provider,
+            gtk4::STYLE_PROVIDER_PRIORITY_USER,
+        );
+    }
+
+    let path = xdg::BaseDirectories::with_prefix("gtk-4.0")
+    .ok()
+    .and_then(|xdg_dirs| xdg_dirs.find_config_file("gtk.css"))
+    .unwrap_or_else(|| "~/.config/gtk-4.0/gtk.css".into());
+    let file = gio::File::for_path(path);
+    if let Ok(monitor) = file.monitor(FileMonitorFlags::all(), None::<&gio::Cancellable>) {
+        monitor.connect_changed(glib::clone!(@strong user_provider => move |_monitor, file, _other_file, event| {
+            match event {
+                FileMonitorEvent::Deleted | FileMonitorEvent::MovedOut | FileMonitorEvent::Renamed => {
+                    if adw::is_initialized() {
+                        let manager = StyleManager::default();
+                        let css = if manager.is_dark() {
+                            adw_user_colors_lib::colors::ColorOverrides::dark_default().as_css()
+                        } else {
+                            adw_user_colors_lib::colors::ColorOverrides::light_default().as_css()
+                        };
+                        user_provider
+                            .load_from_data(css.as_bytes());
+                    }
+                },
+                FileMonitorEvent::ChangesDoneHint | FileMonitorEvent::Created | FileMonitorEvent::MovedIn => {
+                    user_provider.load_from_file(file);
+                },
+                _ => {} // ignored
+            }
+        }));
+        Some(monitor)
+    } else {
+        None
+    }
+}