ribir_core 0.2.0-alpha.3

Ribir is a framework for building modern native/wasm cross-platform user interface applications.
Documentation 
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use crate::prelude::*;
#[derive(PartialEq, Clone, Declare)]
pub struct HasFocus {
  #[declare(skip, default)]
  focused: bool,
}

impl HasFocus {
  pub fn has_focus(&self) -> bool { self.focused }
}

impl ComposeChild for HasFocus {
  type Child = Widget;
  fn compose_child(this: impl StateWriter<Value = Self>, child: Self::Child) -> impl WidgetBuilder {
    fn_widget! {
      @ $child {
        on_focus_in: move|_| $this.write().focused = true,
        on_focus_out: move |_| $this.write().focused = false,
      }
    }
  }
}