initial function management refactoring

src/function_manager.rs

@@ -0,0 +1,55 @@
+use crate::function_entry::{FunctionEntry, DEFAULT_FUNCTION_ENTRY};
+use uuid::Uuid;
+
+pub struct Manager {
+	functions: Vec<(Uuid, FunctionEntry)>,
+}
+
+impl Default for Manager {
+	fn default() -> Self {
+		Self {
+			functions: vec![(Uuid::new_v4(), DEFAULT_FUNCTION_ENTRY.clone())],
+		}
+	}
+}
+
+impl Manager {
+	pub fn display_entries(&mut self, ui: &mut egui::Ui) {
+		// ui.label("Functions:");
+		let can_remove = self.functions.len() > 1;
+
+		let mut remove_i: Option<usize> = None;
+		for (i, (uuid, function)) in self.functions.iter_mut().enumerate() {
+			// Entry for a function
+			if function.function_entry(ui, can_remove, i) {
+				remove_i = Some(i);
+			}
+
+			function.settings_window(ui.ctx());
+		}
+
+		// Remove function if the user requests it
+		if let Some(remove_i_unwrap) = remove_i {
+			self.functions.remove(remove_i_unwrap);
+		}
+	}
+
+	pub fn new_function(&mut self) {
+		self.functions
+			.push((Uuid::new_v4(), DEFAULT_FUNCTION_ENTRY.clone()));
+	}
+
+	pub fn any_using_integral(&self) -> bool {
+		self.functions
+			.iter()
+			.filter(|(_, func)| func.integral)
+			.count() > 0
+	}
+
+	#[inline]
+	pub fn len(&self) -> usize { self.functions.len() }
+
+	pub fn get_entries_mut(&mut self) -> &mut Vec<(Uuid, FunctionEntry)> { &mut self.functions }
+
+	pub fn get_entries(&self) -> &Vec<(Uuid, FunctionEntry)> { &self.functions }
+}