book: Use new API spawn_future_local (#1533)

Author: Hofer-Julian

book/listings/Cargo.lock

@@ -1,7 +1,7 @@
 use std::thread;
 use std::time::Duration;
 
-use glib::{clone, MainContext};
+use glib::clone;
 use gtk::prelude::*;
 use gtk::{gio, glib, Application, ApplicationWindow, Button};
 
@@ -40,18 +40,17 @@ fn build_ui(app: &Application) {
             sender
                 .send_blocking(false)
                 .expect("The channel needs to be open.");
-            let ten_seconds = Duration::from_secs(10);
-            thread::sleep(ten_seconds);
+            let five_seconds = Duration::from_secs(5);
+            thread::sleep(five_seconds);
             // Activate the button again
             sender
                 .send_blocking(true)
                 .expect("The channel needs to be open.");
         });
     });
 
-    let main_context = MainContext::default();
     // The main loop executes the asynchronous block
-    main_context.spawn_local(clone!(@weak button => async move {
+    glib::spawn_future_local(clone!(@weak button => async move {
         while let Ok(enable_button) = receiver.recv().await {
             button.set_sensitive(enable_button);
         }

book/listings/main_event_loop/3/main.rs

@@ -1,4 +1,4 @@
-use glib::{clone, MainContext};
+use glib::clone;
 use gtk::prelude::*;
 use gtk::{glib, Application, ApplicationWindow, Button};
 
@@ -30,8 +30,7 @@ fn build_ui(app: &Application) {
     let (sender, receiver) = async_channel::bounded(1);
     // Connect to "clicked" signal of `button`
     button.connect_clicked(move |_| {
-        let main_context = MainContext::default();
-        main_context.spawn_local(clone!(@strong sender => async move {
+        glib::spawn_future_local(clone!(@strong sender => async move {
             // Deactivate the button until the operation is done
             sender.send(false).await.expect("The channel needs to be open.");
             glib::timeout_future_seconds(5).await;
@@ -40,9 +39,8 @@ fn build_ui(app: &Application) {
         }));
     });
 
-    let main_context = MainContext::default();
     // The main loop executes the asynchronous block
-    main_context.spawn_local(clone!(@weak button => async move {
+    glib::spawn_future_local(clone!(@weak button => async move {
         while let Ok(enable_button) = receiver.recv().await {
             button.set_sensitive(enable_button);
         }

book/listings/main_event_loop/4/main.rs

@@ -1,4 +1,4 @@
-use glib::{clone, MainContext};
+use glib::clone;
 use gtk::prelude::*;
 use gtk::{glib, Application, ApplicationWindow, Button};
 
@@ -28,8 +28,7 @@ fn build_ui(app: &Application) {
     // ANCHOR: callback
     // Connect to "clicked" signal of `button`
     button.connect_clicked(move |button| {
-        let main_context = MainContext::default();
-        main_context.spawn_local(clone!(@weak button => async move {
+        glib::spawn_future_local(clone!(@weak button => async move {
             // Deactivate the button until the operation is done
             button.set_sensitive(false);
             glib::timeout_future_seconds(5).await;

book/listings/main_event_loop/5/main.rs

@@ -1,4 +1,4 @@
-use glib::{clone, MainContext};
+use glib::clone;
 use gtk::prelude::*;
 use gtk::{gio, glib};
 use gtk::{Application, ApplicationWindow, Button};
@@ -31,14 +31,13 @@ fn build_ui(app: &Application) {
     // ANCHOR: callback
     // Connect to "clicked" signal of `button`
     button.connect_clicked(move |button| {
-        let main_context = MainContext::default();
         // The main loop executes the asynchronous block
-        main_context.spawn_local(clone!(@weak button => async move {
+        glib::spawn_future_local(clone!(@weak button => async move {
             // Deactivate the button until the operation is done
             button.set_sensitive(false);
             let enable_button = gio::spawn_blocking(move || {
-                let ten_seconds = Duration::from_secs(10);
-                thread::sleep(ten_seconds);
+                let five_seconds = Duration::from_secs(5);
+                thread::sleep(five_seconds);
                 true
             })
             .await

book/listings/main_event_loop/6/main.rs

@@ -1,6 +1,6 @@
 use ashpd::desktop::account::UserInformation;
 use ashpd::WindowIdentifier;
-use glib::{clone, MainContext};
+use glib::clone;
 use gtk::prelude::*;
 use gtk::{glib, Application, ApplicationWindow, Button};
 
@@ -30,9 +30,8 @@ fn build_ui(app: &Application) {
     // ANCHOR: callback
     // Connect to "clicked" signal of `button`
     button.connect_clicked(move |button| {
-        let main_context = MainContext::default();
         // The main loop executes the asynchronous block
-        main_context.spawn_local(clone!(@weak button => async move {
+        glib::spawn_future_local(clone!(@weak button => async move {
             // Get native of button for window identifier
             let native = button.native().expect("Need to be able to get native.");
             // Get window identifier so that the dialog will be modal to the main window

book/listings/main_event_loop/7/main.rs

@@ -1,4 +1,4 @@
-use glib::{clone, MainContext};
+use glib::clone;
 use gtk::glib;
 use gtk::prelude::*;
 use gtk::{Application, ApplicationWindow, Button};
@@ -30,25 +30,23 @@ fn build_ui(app: &Application) {
     let (sender, receiver) = async_channel::bounded(1);
     // Connect to "clicked" signal of `button`
     button.connect_clicked(move |_| {
-        let main_context = MainContext::default();
         // The main loop executes the asynchronous block
-        main_context.spawn_local(clone!(@strong sender => async move {
+        glib::spawn_future_local(clone!(@strong sender => async move {
             let response = reqwest::get("https://www.gtk-rs.org").await;
             sender.send(response).await.expect("The channel needs to be open.");
         }));
     });
 
-    let main_context = MainContext::default();
     // The main loop executes the asynchronous block
-    main_context.spawn_local(clone!(@weak button => async move {
+    glib::spawn_future_local(async move {
         while let Ok(response) = receiver.recv().await {
             if let Ok(response) = response {
                 println!("Status: {}", response.status());
             } else {
                 println!("Could not make a `GET` request.");
             }
         }
-    }));
+    });
     // ANCHOR_END: callback
 
     // Create a window

book/listings/main_event_loop/8/main.rs

@@ -1,4 +1,4 @@
-use glib::{clone, MainContext};
+use glib::clone;
 use gtk::glib;
 use gtk::prelude::*;
 use gtk::{Application, ApplicationWindow, Button};
@@ -42,17 +42,16 @@ fn build_ui(app: &Application) {
         }));
     });
 
-    let main_context = MainContext::default();
     // The main loop executes the asynchronous block
-    main_context.spawn_local(clone!(@weak button => async move {
+    glib::spawn_future_local(async move {
         while let Ok(response) = receiver.recv().await {
             if let Ok(response) = response {
                 println!("Status: {}", response.status());
             } else {
                 println!("Could not make a `GET` request.");
             }
         }
-    }));
+    });
     // ANCHOR_END: callback
 
     // Create a window

book/listings/main_event_loop/9/main.rs

@@ -79,9 +79,9 @@ However, we don't want to block the main loop while waiting for a message to rec
 That is the whole point of the exercise after all!
 
 We solve that problem by waiting for messages in an [`async`](https://rust-lang.github.io/async-book/) block.
-This `async` block is spawned on the `glib` main loop with [`spawn_local`](https://gtk-rs.org/gtk-rs-core/stable/latest/docs/glib/struct.MainContext.html#method.spawn_local)
+This `async` block is spawned on the `glib` main loop with [`spawn_future_local`](https://gtk-rs.org/gtk-rs-core/stable/latest/docs/glib/fn.spawn_future_local.html)
 
-> See also [`spawn`](https://gtk-rs.org/gtk-rs-core/stable/latest/docs/glib/struct.MainContext.html#method.spawn) for spawning async blocks on the main loop from outside the main thread.
+> See also [`spawn_future`](https://gtk-rs.org/gtk-rs-core/stable/latest/docs/glib/fn.spawn_future.html) for spawning async blocks on the main loop from outside the main thread.
 
 Filename: <a class=file-link href="https://github.com/gtk-rs/gtk4-rs/blob/master/book/listings/main_event_loop/3/main.rs">listings/main_event_loop/3/main.rs</a>