Update state of App from other thread

src/app.rs

@@ -1,5 +1,9 @@
 use egui::Align2;
 use egui_toast::{Toasts};
+use std::{
+    sync::{Arc, Mutex},
+    time::Duration,
+};
 
 /// We derive Deserialize/Serialize so we can persist app state on shutdown.
 #[derive(serde::Deserialize, serde::Serialize)]
@@ -12,6 +16,8 @@ pub struct TwoDBApp {
     value: f32,
 
     pub(crate) is_busy: bool, // This field is for Spinner
+
+    pub field: Arc<Mutex<i128>>,
 }
 
 impl Default for TwoDBApp {
@@ -21,6 +27,7 @@ impl Default for TwoDBApp {
             label: "Hello World! 2".to_owned(),
             value: 2.6,
             is_busy: false,
+            field: Arc::new(Mutex::new(0)),
         }
     }
 }
@@ -87,6 +94,12 @@ impl eframe::App for TwoDBApp {
             // The central panel the region left after adding TopPanel's and SidePanel's
             ui.heading("Clean Tables");
 
+            ui.horizontal(|ui| {
+                ui.label(
+                    format!("{}", self.field.lock().unwrap())
+                );
+            });
+
             ui.horizontal(|ui| {
                 ui.label("Write something: ");
                 ui.text_edit_singleline(&mut self.label);

src/widgets/update_empty_tables_button.rs

@@ -16,7 +16,9 @@ impl TwoDBApp {
     }
 
     fn get_empty_tables_event(&mut self) {
+        let field = self.field.clone();
         thread::spawn(move || {
+            *field.lock().unwrap() += 1;
             let mut thread_toasts = Toasts::new()
                 .anchor(Align2::RIGHT_BOTTOM, (-10.0, -10.0)) // 10 units from the bottom right corner
                 .direction(egui::Direction::BottomUp);

src/widgets/update_tables_button.rs

@@ -5,7 +5,7 @@ use crate::working_database::{update_all_tables};
 
 impl TwoDBApp {
     pub fn render_update_tables_button(&mut self, ui: &mut egui::Ui) {
-        if ui.button("Update Tables (not yet implemented)").clicked() {
+        if ui.button("Update Tables").clicked() {
             self.is_busy = true;
             ui.close_menu();
             self.button_update_tables_event();