Cleaned up and documented the login screen code.

src/widgets/login_screen.rs

@@ -28,6 +28,10 @@ pub enum LoginStatus {
     Error(String),
 }
 
+/// A struct that represents a login attempt, containing a username, a default nick, and a password.
+/// None are validated in any way.
+///
+/// Warning: this struct contains the user's password; keep it in memory only as short as possible.
 #[derive(Clone)]
 pub struct LoginAttempt {
     pub username: String,
@@ -45,6 +49,11 @@ impl Debug for LoginAttempt {
     }
 }
 
+/// The props for the login screen widget, including:
+/// * The xmpp address to pre-fill in the username field.
+/// * The default nick to pre-fill in the default nick field.
+/// * The current login state, which will change as the user attempts to log in.
+/// * The event handler for when the user clicks the login button.
 #[derive(Props)]
 pub struct LoginScreenProps<'a> {
     cached_username: String,
@@ -53,10 +62,32 @@ pub struct LoginScreenProps<'a> {
     on_login_attempt: EventHandler<'a, LoginAttempt>,
 }
 
+/// A login screen widget.
+///
+/// This widget is used to query the user for their login credentials, namely:
+/// * Username (XMPP address/Jid)
+/// * Default nick
+/// * Password
+///
+/// The default nick and username may be pre-filled from the cache.
+///
+/// The widget itself only contains the UI, and does not know how to validate the credentials
+/// or log the user in; the parent context is responsible for that.
+///
+/// As a small UX improvement, the widget will automatically fill in the default nick
+/// based on the username, if the user has not changed the default nick.
 pub fn LoginScreen<'a>(cx: Scope<'a, LoginScreenProps>) -> Element<'a> {
+
+    // The username.
     let username = use_state(cx, || cx.props.cached_username.clone());
+
+    // The default nick.
     let default_nick = use_state(cx, || cx.props.cached_nick.clone());
+
+    // The password.
     let password = use_state(cx, || "".to_string());
+
+    // Track whether the default nick was directly changed by the user.
     let default_nick_was_changed = use_state(cx, || false);
 
     render! {
@@ -64,13 +95,17 @@ pub fn LoginScreen<'a>(cx: Scope<'a, LoginScreenProps>) -> Element<'a> {
         div {
             class: "login-form",
 
+            // The username input.
             input {
                 "type": "text",
-                placeholder: "Username",
+                placeholder: "XMPP Address",
                 value: "{username}",
                 oninput: move |x| {
+
+                    // Set the username state variable.
                     username.set(x.value.clone());
 
+                    // If the default nick was not changed by the user, set it to the part before the @.
                     if !default_nick_was_changed.get() {
                         if let Some(before_at) = x.value.split('@').next() {
                             default_nick.set(before_at.to_string());
@@ -79,16 +114,21 @@ pub fn LoginScreen<'a>(cx: Scope<'a, LoginScreenProps>) -> Element<'a> {
                 },
             }
 
+            // The default nick input.
             input {
                 placeholder: "Default nick",
                 "type": "text",
                 value: "{default_nick}",
                 oninput: move |x| {
+                    // Store the nick in the state variable.
                     default_nick.set(x.value.clone());
+
+                    // Mark the nick as changed, so that it won't be overwritten by the username.
                     default_nick_was_changed.set(true);
                 },
             }
 
+            // The password input.
             input {
                 placeholder: "Password",
                 "type": "password",
@@ -109,11 +149,11 @@ pub fn LoginScreen<'a>(cx: Scope<'a, LoginScreenProps>) -> Element<'a> {
             rsx! {
                 button {
 
-                    class: match cx.props.login_state {
-                        LoginStatus::LoggedOut => "login-button logged-out",
-                        LoginStatus::LoggingIn => "login-button logging-in",
-                        LoginStatus::LoggedIn => "login-button logged-in",
-                        LoginStatus::Error(_) => "error",
+                    disabled: match cx.props.login_state {
+                        LoginStatus::LoggedIn => true,
+                        LoginStatus::LoggedOut => false,
+                        LoginStatus::LoggingIn => true,
+                        LoginStatus::Error(_) => false,
                     },
 
                     onclick: move |_| {
@@ -124,7 +164,12 @@ pub fn LoginScreen<'a>(cx: Scope<'a, LoginScreenProps>) -> Element<'a> {
                         });
                     },
 
-                    "Login"
+                    match cx.props.login_state {
+                        LoginStatus::LoggedOut => "Log in",
+                        LoginStatus::LoggingIn => "Logging in...",
+                        LoginStatus::LoggedIn => "Logged in",
+                        LoginStatus::Error(_) => "Log in",
+                    }
                 }
 
             }