Refactor main window setup for clarity

- Extract WindowAttributes modification into a named closure
- Simplify and clean up winit/Slint imports
- Explanatory comments
- rustfmt and clippy cleanup

src/main.rs

@@ -1,35 +1,48 @@
 use i_slint_backend_winit::{
     Backend,
-    winit::platform::x11::{WindowAttributesExtX11, WindowType},
+    winit::{
+        platform::x11::{WindowAttributesExtX11, WindowType},
+        window::WindowAttributes,
+    },
 };
 use slint::{LogicalPosition, LogicalSize};
 slint::include_modules!();
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    // Configure winit attributes before any Slint window is created.
+    // Closure that adjusts winit WindowAttributes before Slint creates the window.
-    let backend = Backend::builder()
+    let window_attrs = |attrs: WindowAttributes| {
-        .with_window_attributes_hook(|attrs| {
+        // Mark the X11 window as a DOCK so the WM treats it as a top bar/panel.
-            // Mark the X11 window as a dock so WMs treat it as a panel/topbar.
+        attrs.with_x11_window_type(vec![WindowType::Dock])
-            attrs.with_x11_window_type(vec![WindowType::Dock])
+    };
-            // hide from taskbar / pagers (useful for panels)
-            //.with_skip_taskbar(true)
-        })
-        .build()?;
 
+    // Build a Slint backend that applies this attribute hook to all windows.
+    let backend = Backend::builder()
+        .with_window_attributes_hook(window_attrs) // Register the hook
+        .build()?; // Construct backend
+
+    // Activate this customized backend for all Slint window creation and events.
     slint::platform::set_platform(Box::new(backend))?;
 
+    // Bar dimensions.
     let bar_height = 25;
     let bar_width = 1366;
 
+    // Create the Slint UI component.
     let ui = TopBar::new()?;
+    // Set component properties.
     ui.set_bar_width(bar_width);
     ui.set_bar_height(bar_height);
 
+    // Size the window to match the bar.
     #[allow(clippy::cast_precision_loss)]
     ui.window()
         .set_size(LogicalSize::new(bar_width as f32, bar_height as f32));
+
+    // Position the window (bar) at the top-left.
     ui.window().set_position(LogicalPosition::new(0.0, 0.0));
 
+    // Run the Slint event loop.
     ui.run()?;
+
     Ok(())
 }