working main menu

crates/app/app_menu.rs

@@ -0,0 +1,88 @@
+use crate::*;
+
+/// Various possible dialog modes.
+#[derive(Debug, Clone, Default, PartialEq)]
+pub enum Dialog {
+    #[default] None,
+    Help(usize),
+    Menu(usize, MenuItems),
+    Device(usize),
+    Message(Arc<str>),
+    Browse(BrowseTarget, Arc<Browse>),
+    Options,
+}
+
+#[derive(Debug, Clone, Default, PartialEq)]
+pub struct MenuItems(pub Arc<[MenuItem]>);
+
+impl AsRef<Arc<[MenuItem]>> for MenuItems {
+    fn as_ref (&self) -> &Arc<[MenuItem]> {
+        &self.0
+    }
+}
+
+#[derive(Clone)]
+pub struct MenuItem(
+    /// Label
+    pub Arc<str>,
+    /// Callback
+    pub Arc<Box<dyn Fn(&mut App)->Usually<()> + Send + Sync>>
+);
+
+impl Default for MenuItem {
+    fn default () -> Self { Self("".into(), Arc::new(Box::new(|_|Ok(())))) }
+}
+
+impl_debug!(MenuItem |self, w| { write!(w, "{}", &self.0) });
+
+impl PartialEq for MenuItem {
+    fn eq (&self, other: &Self) -> bool {
+        self.0 == other.0
+    }
+}
+
+impl Dialog {
+    pub fn welcome () -> Self {
+        Self::Menu(1, MenuItems([
+            MenuItem("Resume session".into(),     Arc::new(Box::new(|_|Ok(())))),
+            MenuItem("Create new session".into(), Arc::new(Box::new(|app|Ok({
+                app.dialog = Dialog::None;
+                app.mode = app.config.modes.clone().read().unwrap().get(":arranger").cloned().unwrap();
+            })))),
+            MenuItem("Load old session".into(),   Arc::new(Box::new(|_|Ok(())))),
+        ].into()))
+    }
+    pub fn menu_next (&self) -> Self {
+        match self {
+            Self::Menu(index, items) => Self::Menu(wrap_inc(*index, items.0.len()), items.clone()),
+            _ => Self::None
+        }
+    }
+    pub fn menu_prev (&self) -> Self {
+        match self {
+            Self::Menu(index, items) => Self::Menu(wrap_dec(*index, items.0.len()), items.clone()),
+            _ => Self::None
+        }
+    }
+    pub fn menu_selected (&self) -> Option<usize> {
+        if let Self::Menu(selected, _) = self { Some(*selected) } else { None }
+    }
+    pub fn device_kind (&self) -> Option<usize> {
+        if let Self::Device(index) = self { Some(*index) } else { None }
+    }
+    pub fn device_kind_next (&self) -> Option<usize> {
+        self.device_kind().map(|index|(index + 1) % device_kinds().len())
+    }
+    pub fn device_kind_prev (&self) -> Option<usize> {
+        self.device_kind().map(|index|index.overflowing_sub(1).0.min(device_kinds().len().saturating_sub(1)))
+    }
+    pub fn message (&self) -> Option<&str> {
+        todo!()
+    }
+    pub fn browser (&self) -> Option<&Arc<Browse>> {
+        todo!()
+    }
+    pub fn browser_target (&self) -> Option<&BrowseTarget> {
+        todo!()
+    }
+}