Set up a stylesheet

Cargo.lock

@@ -339,6 +339,7 @@ dependencies = [
  "geo-types",
  "gio",
  "glib",
+ "glib-build-tools",
  "gtk4",
  "ifc",
  "lazy_static",

dashboard/Cargo.toml

@@ -26,3 +26,7 @@ serde_json          = { version = "1" }
 serde               = { version = "1" }
 tokio               = { version = "1", features = ["full"] }
 unic-langid         = { version = "0.9" }
+
+[build-dependencies]
+glib-build-tools = "0.16"
+

dashboard/build.rs

@@ -0,0 +1,7 @@
+fn main() {
+    glib_build_tools::compile_resources(
+        "resources",
+        "resources/gresources.xml",
+        "com.luminescent-dreams.dashboard.gresource",
+    );
+}

dashboard/resources/gresources.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<gresources>
+    <gresource prefix="/com/luminescent-dreams/dashboard/">
+        <file>style.css</file>
+    </gresource>
+</gresources>
+

dashboard/resources/style.css

@@ -0,0 +1,5 @@
+@define-color background_color @purple_5;
+
+label {
+    font-size: 200%;
+}

dashboard/src/app_window.rs

@@ -3,7 +3,8 @@ use crate::{
     types::State,
 };
 use adw::prelude::AdwApplicationWindowExt;
-use gtk::prelude::*;
+use gio::resources_lookup_data;
+use gtk::{prelude::*, STYLE_PROVIDER_PRIORITY_USER};
 
 #[derive(Clone)]
 pub struct ApplicationWindow {
@@ -17,6 +18,21 @@ impl ApplicationWindow {
     pub fn new(app: &adw::Application) -> Self {
         let window = adw::ApplicationWindow::new(app);
 
+        let stylesheet = String::from_utf8(
+            resources_lookup_data(
+                "/com/luminescent-dreams/dashboard/style.css",
+                gio::ResourceLookupFlags::NONE,
+            )
+            .expect("stylesheet should just be available")
+            .to_vec(),
+        )
+        .expect("to parse stylesheet");
+
+        let provider = gtk::CssProvider::new();
+        provider.load_from_data(&stylesheet);
+        let context = window.style_context();
+        context.add_provider(&provider, STYLE_PROVIDER_PRIORITY_USER);
+
         let layout = gtk::Box::builder()
             .orientation(gtk::Orientation::Vertical)
             .hexpand(true)

dashboard/src/main.rs

@@ -70,6 +70,9 @@ pub struct Core {
 }
 
 pub fn main() {
+    gio::resources_register_include!("com.luminescent-dreams.dashboard.gresource")
+        .expect("Failed to register resources");
+
     let app = adw::Application::builder()
         .application_id("com.luminescent-dreams.dashboard")
         .resource_base_path("/com/luminescent-dreams/dashboard")