Setup a layer trait

src/app.rs

@@ -1,20 +1,23 @@
 use std::time::Duration;
-use eframe::{egui, Frame, Storage, CreationContext};
+use eframe::{Frame, Storage, CreationContext};
 use eframe::egui::{Context, Ui};
 use serde::{Deserialize, Serialize};
 
-#[derive(Default)]
 pub(crate) struct Application {
     settings: AppSettings,
+    layers:  Vec<Box<dyn crate::layer::Layer>>,
 }
 
 #[derive(Serialize, Deserialize, Default)]
 struct AppSettings {
-    serialization_test_string: String,
+    use_cookies: bool,
+    use_firefox_cookies: bool,
+    use_chrome_cookies: bool,
+    save_thumbnails: bool,
 }
 
 impl Application {
-    pub fn new(cc: &CreationContext) -> Self {
+    pub fn new(cc: &CreationContext, layers: Vec<Box<dyn crate::layer::Layer>>) -> Self {
         let mut settings = AppSettings::default();
         if let Some(storage) = cc.storage {
             if let Some(stored_str) = storage.get_string("app_settings") {
@@ -24,21 +27,26 @@ impl Application {
             }
         }
 
-        Self { settings }
+        Self { settings, layers }
     }
 }
 
 impl eframe::App for Application {
 
     fn logic(&mut self, ctx: &Context, frame: &mut Frame) {
-
+        let mut layers = std::mem::take(&mut self.layers);
+        for layer in &mut layers {
+            layer.logic(self, ctx, frame);
+        }
+        self.layers = layers;
     }
 
     fn ui(&mut self, ui: &mut Ui, frame: &mut Frame) {
-        egui::CentralPanel::default().show(ui, |ui| {
-            ui.heading("Hello!");
-            ui.text_edit_singleline(&mut self.settings.serialization_test_string);
-        });
+        let mut layers = std::mem::take(&mut self.layers);
+        for layer in &mut layers {
+            layer.ui(self, ui, frame);
+        }
+        self.layers = layers;
     }
 
     fn save(&mut self, _storage: &mut dyn Storage) {