factors out navigable trait

1 files changed, 45 insertions, 0 deletions

diff --git a/schist_desktop_gui/src/gui/components/navigation/navigate_navigation.rs b/schist_desktop_gui/src/gui/components/navigation/navigate_navigation.rs
new file mode 100644
index 0000000..f399cd0
--- /dev/null
+++ b/schist_desktop_gui/src/gui/components/navigation/navigate_navigation.rs
@@ -0,0 +1,45 @@
+use iced::Element;
+
+use crate::traits::{Navigable, NavigationResult};
+
+use super::{Message, Navigation};
+
+impl<'a, TOption> Navigable<TOption> for Navigation<TOption>
+where
+    TOption: Clone + PartialEq + 'a,
+    Element<'a, Message<TOption>>: From<&'a TOption>,
+{
+    fn move_next(&mut self) -> NavigationResult<TOption> {
+        if let Some(next) = self.options_after_active.clone().first() {
+            self.options_before_active = vec![
+                self.options_before_active.clone(),
+                self.active_option.clone().map_or(vec![], |o| vec![o]),
+            ]
+            .concat();
+            self.active_option = Some(next.clone());
+            self.options_after_active = self.options_after_active.split_at(1).1.to_vec();
+            NavigationResult::Moved(next.clone())
+        } else {
+            NavigationResult::LastOption
+        }
+    }
+
+    fn move_prev(&mut self) -> NavigationResult<TOption> {
+        if let Some(prev) = self.options_before_active.clone().last() {
+            self.options_after_active = vec![
+                self.active_option.clone().map_or(vec![], |o| vec![o]),
+                self.options_after_active.clone(),
+            ]
+            .concat();
+            self.active_option = Some(prev.clone());
+            self.options_before_active = self
+                .options_before_active
+                .split_last()
+                .map(|split| split.1.to_vec())
+                .unwrap_or_else(Vec::new);
+            NavigationResult::Moved(prev.clone())
+        } else {
+            NavigationResult::LastOption
+        }
+    }
+}