Include CSS as GResource

Also use explicit namespace for bare functions and constants used in
main.rs.

Cargo.lock

@@ -364,6 +364,15 @@ dependencies = [
  "smallvec",
 ]
 
+[[package]]
+name = "glib-build-tools"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86aebe63bb050d4918cb1d629880cb35fcba7ccda6f6fc0ec1beffdaa1b9d5c3"
+dependencies = [
+ "gio",
+]
+
 [[package]]
 name = "glib-macros"
 version = "0.21.5"
@@ -1109,6 +1118,7 @@ name = "zoodex"
 version = "1.0.0"
 dependencies = [
  "async-sqlite",
+ "glib-build-tools",
  "gtk4",
  "libadwaita",
  "relm4",

Cargo.toml

@@ -9,6 +9,10 @@ license = "GPL-3.0-or-later"
 [profile.release]
 lto = true
 
+[build-dependencies]
+# Keep version in sync with GLib as included in GTK4
+glib-build-tools = "0.21.0"
+
 [dependencies]
 async-sqlite = { version = "0.5.4", default-features = false }
 gtk4 = { version = "0.10.3", features = ["v4_20"] }

build.rs

@@ -0,0 +1,7 @@
+use glib_build_tools::compile_resources;
+
+
+
+fn main() {
+  compile_resources(&["data"], "data/zoodex.gresource.xml", "zoodex.gresource");
+}

data/zoodex.gresource.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<gresources>
+  <gresource prefix="/com/kernelmaft/zoodex/">
+    <file>application.css</file>
+  </gresource>
+</gresources>

src/main.rs

@@ -5,10 +5,8 @@ mod ui;
 mod views;
 
 use gtk4::gdk::Display;
-use gtk4::{
+use gtk4::gio::File;
-  CssProvider, STYLE_PROVIDER_PRIORITY_APPLICATION, Settings,
+use gtk4::{CssProvider, Settings, gio};
-  style_context_add_provider_for_display,
-};
 use relm4::RelmApp;
 
 use crate::ui::App;
@@ -30,11 +28,19 @@ fn include_app_css() {
   // We can't use relm4::set_global_css because we need access to the CSS provider
   // to relay color scheme changes to it.
 
+  gio::resources_register_include!("zoodex.gresource")
+    .expect("CSS resource bundle should have valid format");
+  let app_css = File::for_uri("resource:///com/kernelmaft/zoodex/application.css");
+
   let provider = CssProvider::new();
   let display = Display::default().expect("getting the default GDK4 display should never fail");
 
-  provider.load_from_string(include_str!("application.css"));
+  provider.load_from_file(&app_css);
-  style_context_add_provider_for_display(&display, &provider, STYLE_PROVIDER_PRIORITY_APPLICATION);
+  gtk4::style_context_add_provider_for_display(
+    &display,
+    &provider,
+    gtk4::STYLE_PROVIDER_PRIORITY_APPLICATION,
+  );
 
   let settings = Settings::for_display(&display);
   provider.set_prefers_color_scheme(settings.gtk_interface_color_scheme());