1 files changed, 71 insertions, 0 deletions
diff --git a/schist_desktop_gui/src/gui/components/navigation/navigation_select_option.rs b/schist_desktop_gui/src/gui/components/navigation/navigation_select_option.rs
new file mode 100644
index 0000000..4192059
--- /dev/null
+++ b/schist_desktop_gui/src/gui/components/navigation/navigation_select_option.rs
@@ -0,0 +1,71 @@
+use iced::Element;
+
+use super::{Message, Navigation};
+
+pub enum SelectOptionResult<TOption> {
+    AlreadySelected,
+    SelectedExistingOption(TOption),
+    SelectedNewOption(TOption),
+}
+
+impl<'a, TOption> Navigation<TOption>
+where
+    TOption: Clone + 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
+                    .clone()
+                    .map_or(vec![], |active_option| vec![active_option]),
+                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());
+            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
+                    .clone()
+                    .map_or(vec![], |active_option| vec![active_option]),
+            ]
+            .concat();
+            self.active_option = Some(option.clone());
+            self.options_after_active = split.1.split_at(1).1.to_vec();
+            SelectOptionResult::SelectedExistingOption(option)
+        } else {
+            if let Some(active_option) = &self.active_option {
+                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.options_after_active = vec![];
+            SelectOptionResult::SelectedNewOption(option)
+        }
+    }
+}