wgui: interactable components, rename TextLabel -> WidgetLabel

wgui/src/components/mod.rs

@@ -1,3 +1,5 @@
+use std::rc::Rc;
+
 use crate::{any::AnyTrait, event::EventAlterables, layout::LayoutState};
 
 pub mod button;
@@ -8,6 +10,26 @@ pub struct InitData<'a> {
 	pub alterables: &'a mut EventAlterables,
 }
 
-pub trait Component: AnyTrait {
+pub trait ComponentTrait: AnyTrait {
 	fn init(&self, data: &mut InitData);
 }
+
+#[derive(Clone)]
+pub struct Component(pub Rc<dyn ComponentTrait>);
+
+pub type ComponentWeak = std::rc::Weak<dyn ComponentTrait>;
+
+impl Component {
+	pub fn weak(&self) -> ComponentWeak {
+		Rc::downgrade(&self.0)
+	}
+
+	pub fn try_cast<T: 'static>(&self) -> anyhow::Result<Rc<T>> {
+		if !(*self.0).as_any().is::<T>() {
+			anyhow::bail!("try_cast: type not matching");
+		}
+
+		// safety: we already checked it above, should be safe to directly cast it
+		unsafe { Ok(Rc::from_raw(Rc::into_raw(self.0.clone()) as _)) }
+	}
+}