dash-frontend: tabs, other fixes (desc)

- set rustfmt line width to 120 columns by default for wgui
- dashboard tabs
- wgui: `remove_children`

dash-frontend/src/tab/mod.rs

@@ -0,0 +1,51 @@
+use std::rc::Rc;
+
+use wgui::{
+	components::button::ComponentButton,
+	event::EventListenerCollection,
+	globals::WguiGlobals,
+	layout::{Layout, WidgetID},
+};
+
+use crate::{FrontendTask, RcFrontend};
+
+pub mod apps;
+pub mod games;
+pub mod home;
+pub mod monado;
+pub mod processes;
+pub mod settings;
+
+#[derive(Clone, Copy, Debug)]
+pub enum TabType {
+	Home,
+	Apps,
+	Games,
+	Monado,
+	Processes,
+	Settings,
+}
+
+pub struct TabParams<'a> {
+	pub globals: &'a WguiGlobals,
+	pub layout: &'a mut Layout,
+	pub parent_id: WidgetID,
+	pub frontend: &'a RcFrontend,
+	pub listeners: &'a mut EventListenerCollection<(), ()>,
+}
+
+pub trait Tab {
+	#[allow(dead_code)]
+	fn get_type(&self) -> TabType;
+}
+
+impl TabType {
+	pub fn register_button(this_rc: RcFrontend, btn: &Rc<ComponentButton>, tab: TabType) {
+		btn.on_click({
+			Box::new(move |_evt| {
+				this_rc.borrow_mut().push_task(FrontendTask::SetTab(tab));
+				Ok(())
+			})
+		});
+	}
+}