It werks!!1

res/main_window.glade

@@ -279,32 +279,76 @@
             <property name="can_focus">True</property>
             <property name="receives_default">True</property>
             <child>
-              <object class="GtkBox">
+              <object class="GtkStack" id="user_button_stack">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
-                <property name="spacing">4</property>
                 <child>
-                  <object class="GtkImage">
+                  <object class="GtkBox">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
-                    <property name="icon_name">address-book-new</property>
-                    <property name="icon_size">3</property>
+                    <property name="spacing">4</property>
+                    <child>
+                      <object class="GtkSpinner">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="active">True</property>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkLabel">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="label" translatable="yes">Loading...</property>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">1</property>
+                      </packing>
+                    </child>
                   </object>
                   <packing>
-                    <property name="expand">False</property>
-                    <property name="fill">True</property>
-                    <property name="position">0</property>
+                    <property name="name">user_loading_page</property>
                   </packing>
                 </child>
                 <child>
-                  <object class="GtkLabel">
+                  <object class="GtkBox">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
-                    <property name="label" translatable="yes">Guest</property>
+                    <property name="spacing">4</property>
+                    <child>
+                      <object class="GtkImage" id="profile_image">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="icon_name">address-book-new</property>
+                        <property name="icon_size">3</property>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkLabel" id="display_name_label">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="label" translatable="yes">&lt;Display Name&gt;</property>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">1</property>
+                      </packing>
+                    </child>
                   </object>
                   <packing>
-                    <property name="expand">False</property>
-                    <property name="fill">True</property>
+                    <property name="name">user_connected_page</property>
                     <property name="position">1</property>
                   </packing>
                 </child>

src/app.rs

@@ -1,20 +1,17 @@
 use gio;
 use gtk;
 use gtk::prelude::*;
-use ruma_client_api::r0 as api;
-use std::env;
+use std::{env, sync, time, thread};
+use matrix_client;
 
+// TODO: Is this the correct format for GApplication IDs?
 const APP_ID: &'static str = "jplatte.ruma_gtk";
 
 pub struct App {
     gtk_app: gtk::Application,
-    matrix_connection: Option<MatrixConnection>,
-}
-
-pub struct MatrixConnection {
-    // reqwest::Client
-    matrix_access_token: String,
-    matrix_user_id: String,
+    gtk_builder: gtk::Builder,
+    dispatch_rx: sync::mpsc::Receiver<Box<Fn(&gtk::Builder) + Send>>,
+    matrix_client_thread_join_handle: thread::JoinHandle<()>,
 }
 
 impl App {
@@ -25,32 +22,46 @@ impl App {
         let gtk_app = gtk::Application::new(Some(APP_ID), gio::ApplicationFlags::empty())
             .expect("Failed to initialize GtkApplication");
 
-        let builder = gtk::Builder::new_from_file("res/main_window.glade");
+        let gtk_builder = gtk::Builder::new_from_file("res/main_window.glade");
 
+        let gtk_builder2 = gtk_builder.clone();
         gtk_app.connect_activate(move |app| {
-            let user_button: gtk::Button = builder.get_object("user_button")
+            let user_button: gtk::Button = gtk_builder2.get_object("user_button")
                 .expect("Couldn't find user_button in ui file.");
 
-            let user_menu: gtk::Popover = builder.get_object("user_menu")
+            let user_menu: gtk::Popover = gtk_builder2.get_object("user_menu")
                 .expect("Couldn't find user_menu in ui file.");
 
             user_button.connect_clicked(move |_| user_menu.show());
 
             // Set up shutdown callback
-            let window: gtk::Window = builder.get_object("main_window")
+            let window: gtk::Window = gtk_builder2.get_object("main_window")
                 .expect("Couldn't find main_window in ui file.");
 
+            let app2 = app.clone();
+            window.connect_delete_event(move |_, _| {
+                app2.quit();
+                Inhibit(false)
+            });
+
             window.set_application(Some(app));
             window.show_all();
         });
 
+        let (dispatch_tx, dispatch_rx) = sync::mpsc::channel::<Box<Fn(&gtk::Builder) + Send>>();
+
+        let matrix_client_thread_join_handle =
+            thread::spawn(move || matrix_client::run_client_main(dispatch_tx));
+
         App {
             gtk_app: gtk_app,
-            matrix_connection: None,
+            gtk_builder: gtk_builder,
+            dispatch_rx: dispatch_rx,
+            matrix_client_thread_join_handle: matrix_client_thread_join_handle,
         }
     }
 
-    pub fn run(&self) {
+    pub fn run(self) {
         // Might just be the only way to go from impl Iterator<Item=String> to &[&str]
         let args = env::args().collect::<Vec<_>>();
         let mut args_refs = Vec::<&str>::new();
@@ -59,15 +70,19 @@ impl App {
             args_refs.push(r);
         }
 
-        self.gtk_app.run(args_refs.len() as i32, &args_refs);
+        let dispatch_rx = self.dispatch_rx;
+        let gtk_builder = self.gtk_builder;
+        gtk::idle_add(move || {
+            if let Ok(dispatch_fn) = dispatch_rx.recv_timeout(time::Duration::from_millis(5)) {
+                dispatch_fn(&gtk_builder);
+            }
+
+            Continue(true)
+        });
 
-        /*let client = reqwest::Client::new().unwrap();
-        let res = client.post("https://matrix.org/_matrix/client/r0/register?kind=guest")
-            .body("{}")
-            .send()
-            .unwrap()
-            .json::<api::account::register::Response>();
+        self.gtk_app.run(args_refs.len() as i32, &args_refs);
 
-        println!("{:?}", res);*/
+        // Clean up
+        self.matrix_client_thread_join_handle.join();
     }
 }

src/main.rs

@@ -1,3 +1,9 @@
+#![feature(box_syntax)]
+
+// not using this yet because rustfmt doesn't support it:
+// https://github.com/rust-lang-nursery/rustfmt/issues/1215
+//#![feature(field_init_shorthand)]
+
 extern crate reqwest;
 extern crate ruma_client_api;
 extern crate gio;
@@ -5,6 +11,7 @@ extern crate gtk;
 // extern crate xdg;
 
 mod app;
+mod matrix_client;
 
 use app::App;
 // use std::fs::File;

src/matrix_client.rs

@@ -0,0 +1,30 @@
+use gtk;
+use reqwest;
+use ruma_client_api::r0 as api;
+use std::sync::mpsc::Sender;
+
+pub fn run_client_main(dispatch_tx: Sender<Box<Fn(&gtk::Builder) + Send>>) {
+    let client = reqwest::Client::new().unwrap();
+    let res = client.post("https://matrix.org/_matrix/client/r0/register?kind=guest")
+        .body("{}")
+        .send()
+        .unwrap()
+        .json::<api::account::register::Response>()
+        .unwrap();
+
+    dispatch_tx.send(box move |builder| {
+        builder.get_object::<gtk::Stack>("user_button_stack")
+            .expect("Can't find user_button_stack in ui file.")
+            .set_visible_child_name("user_connected_page");
+
+        builder.get_object::<gtk::Label>("display_name_label")
+            .expect("Can't find display_name_label in ui file.")
+            .set_text("Guest");
+    });
+}
+
+struct MatrixConnection {
+    /// reqwest::Client,
+    matrix_access_token: String,
+    matrix_user_id: String,
+}