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|
use crate::widget::state;
use crate::widget::Id;
pub trait Operation<T> {
fn container(
&mut self,
id: Option<&Id>,
operate_on_children: &dyn Fn(&mut dyn Operation<T>),
);
fn focusable(
&mut self,
_state: &mut dyn state::Focusable,
_id: Option<&Id>,
) {
}
fn finish(&self) -> Outcome<T> {
Outcome::None
}
}
pub enum Outcome<T> {
None,
Some(T),
Chain(Box<dyn Operation<T>>),
}
pub fn focus<T>(target: Id) -> impl Operation<T> {
struct Focus {
target: Id,
}
impl<T> Operation<T> for Focus {
fn focusable(
&mut self,
state: &mut dyn state::Focusable,
id: Option<&Id>,
) {
if state.is_focused() {
match id {
Some(id) if id == &self.target => {
state.focus();
}
_ => {
state.unfocus();
}
}
}
}
fn container(
&mut self,
_id: Option<&Id>,
operate_on_children: &dyn Fn(&mut dyn Operation<T>),
) {
operate_on_children(self)
}
}
Focus { target }
}
|
