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use iced::Element;
use crate::traits::Focusable;
use super::{Message, Navigation};
pub enum SelectOptionResult<TOption> {
AlreadySelected,
SelectedExistingOption(TOption),
SelectedNewOption(TOption),
}
impl<'a, TOption> Navigation<TOption>
where
TOption: Clone + Focusable + PartialEq + 'a,
Element<'a, Message<TOption>>: From<&'a TOption>,
{
pub fn select_option(&mut self, option: TOption) -> SelectOptionResult<TOption>
where
TOption: Clone + PartialEq + 'a,
{
if self
.active_option
.as_ref()
.is_some_and(|active_option| TOption::eq(active_option, &option))
{
SelectOptionResult::AlreadySelected
} else if let Some(index) = self
.options_before_active
.iter()
.position(|o| TOption::eq(o, &option))
{
let split = self.options_before_active.split_at(index);
self.options_after_active = vec![
self.active_option.as_mut().map_or(vec![], |active_option| {
active_option.unfocus();
vec![active_option.clone()]
}),
split.1.split_at(1).1.to_vec(),
self.options_after_active.clone(),
]
.concat();
self.options_before_active = split.0.to_vec();
self.active_option = Some(option.clone());
self.active_option.iter_mut().for_each(TOption::focus);
SelectOptionResult::SelectedExistingOption(option)
} else if let Some(index) = self
.options_after_active
.iter()
.position(|o| TOption::eq(o, &option))
{
let split = self.options_after_active.split_at(index);
self.options_before_active = vec![
self.options_before_active.clone(),
split.0.to_vec(),
self.active_option.as_mut().map_or(vec![], |active_option| {
active_option.unfocus();
vec![active_option.clone()]
}),
]
.concat();
self.active_option = Some(option.clone());
self.active_option.iter_mut().for_each(TOption::focus);
self.options_after_active = split.1.split_at(1).1.to_vec();
SelectOptionResult::SelectedExistingOption(option)
} else {
if let Some(active_option) = &mut self.active_option {
active_option.unfocus();
self.options_before_active.push(active_option.clone());
}
self.options_before_active
.append(&mut self.options_after_active);
self.active_option = Some(option.clone());
self.active_option.iter_mut().for_each(TOption::focus);
self.options_after_active = vec![];
SelectOptionResult::SelectedNewOption(option)
}
}
}
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