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