home: Display current organization's name and icon atop menu

Fixes #1037

Author: chimnayajith

assets/l10n/app_en.arb

@@ -23,6 +23,10 @@
   "@switchAccountButton": {
     "description": "Label for main-menu button leading to the choose-account page."
   },
+  "organizationsButtonLabel": "Organizations",
+  "@organizationsButtonLabel": {
+    "description": "Button text to view and switch between different organizations."
+  },
   "tryAnotherAccountMessage": "Your account at {url} is taking a while to load.",
   "@tryAnotherAccountMessage": {
     "description": "Message that appears on the loading screen after waiting for some time.",

lib/generated/l10n/zulip_localizations.dart

@@ -141,6 +141,12 @@ abstract class ZulipLocalizations {
   /// **'Switch account'**
   String get switchAccountButton;
 
+  /// Button text to view and switch between different organizations.
+  ///
+  /// In en, this message translates to:
+  /// **'Organizations'**
+  String get organizationsButtonLabel;
+
   /// Message that appears on the loading screen after waiting for some time.
   ///
   /// In en, this message translates to:

lib/generated/l10n/zulip_localizations_ar.dart

@@ -26,6 +26,9 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   @override
   String get switchAccountButton => 'Switch account';
 
+  @override
+  String get organizationsButtonLabel => 'Organizations';
+
   @override
   String tryAnotherAccountMessage(Object url) {
     return 'Your account at $url is taking a while to load.';

lib/generated/l10n/zulip_localizations_en.dart

@@ -26,6 +26,9 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   @override
   String get switchAccountButton => 'Switch account';
 
+  @override
+  String get organizationsButtonLabel => 'Organizations';
+
   @override
   String tryAnotherAccountMessage(Object url) {
     return 'Your account at $url is taking a while to load.';

lib/generated/l10n/zulip_localizations_ja.dart

@@ -26,6 +26,9 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   @override
   String get switchAccountButton => 'Switch account';
 
+  @override
+  String get organizationsButtonLabel => 'Organizations';
+
   @override
   String tryAnotherAccountMessage(Object url) {
     return 'Your account at $url is taking a while to load.';

lib/generated/l10n/zulip_localizations_nb.dart

@@ -26,6 +26,9 @@ class ZulipLocalizationsNb extends ZulipLocalizations {
   @override
   String get switchAccountButton => 'Switch account';
 
+  @override
+  String get organizationsButtonLabel => 'Organizations';
+
   @override
   String tryAnotherAccountMessage(Object url) {
     return 'Your account at $url is taking a while to load.';

lib/generated/l10n/zulip_localizations_pl.dart

@@ -26,6 +26,9 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   @override
   String get switchAccountButton => 'Przełącz konto';
 
+  @override
+  String get organizationsButtonLabel => 'Organizations';
+
   @override
   String tryAnotherAccountMessage(Object url) {
     return 'Twoje konto na $url wymaga jeszcze chwili na załadowanie.';

lib/generated/l10n/zulip_localizations_ru.dart

@@ -26,6 +26,9 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   @override
   String get switchAccountButton => 'Сменить учетную запись';
 
+  @override
+  String get organizationsButtonLabel => 'Organizations';
+
   @override
   String tryAnotherAccountMessage(Object url) {
     return 'Ваша учетная запись на $url загружается медленно.';

lib/generated/l10n/zulip_localizations_sk.dart

@@ -26,6 +26,9 @@ class ZulipLocalizationsSk extends ZulipLocalizations {
   @override
   String get switchAccountButton => 'Zmeniť účet';
 
+  @override
+  String get organizationsButtonLabel => 'Organizations';
+
   @override
   String tryAnotherAccountMessage(Object url) {
     return 'Načítavanie vášho konta na adrese $url chvílu trvá.';

lib/widgets/home.dart

@@ -310,6 +310,7 @@ void _showMainMenu(BuildContext context, {
             crossAxisAlignment: CrossAxisAlignment.stretch,
             mainAxisSize: MainAxisSize.min,
             children: [
+              _OrganizationHeader(),
               Flexible(child: InsetShadowBox(
                 top: 8, bottom: 8,
                 color: designVariables.bgBotBar,
@@ -326,6 +327,84 @@ void _showMainMenu(BuildContext context, {
     });
 }
 
+class _OrganizationHeader extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final store = PerAccountStoreWidget.of(context);
+    final designVariables = DesignVariables.of(context);
+    final zulipLocalizations = ZulipLocalizations.of(context);
+
+    String organizationName = store.realmName;
+    Uri? organizationIcon = store.tryResolveUrl(store.realmIcon);
+    final buttonStyle = TextButton.styleFrom(
+      splashFactory: NoSplash.splashFactory,
+      overlayColor: Colors.transparent
+    );
+
+    return Padding(
+      padding: const EdgeInsets.symmetric(vertical: 8, horizontal: 16),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.spaceBetween,
+        children: [
+          Expanded(
+            child: Row(
+              children: [
+                Image.network(
+                  organizationIcon.toString(),
+                  width: 28,
+                  height: 28,
+                  fit: BoxFit.contain,
+                  errorBuilder: (context, error, stackTrace) {
+                    return const SizedBox(
+                      width: 28,
+                      height: 28,
+                      child: Placeholder(),
+                    );
+                  },
+                  loadingBuilder: (context, child, loadingProgress) {
+                    if (loadingProgress == null) return child;
+                    return const SizedBox(
+                      width: 28,
+                      height: 28,
+                      child: CircularProgressIndicator(),
+                    );
+                  },
+                ),
+                const SizedBox(width: 8),
+                Expanded(
+                  child: Text(
+                    organizationName,
+                    style: const TextStyle(
+                      fontWeight: FontWeight.bold,
+                      fontSize: 20,
+                    ),
+                    overflow: TextOverflow.ellipsis,
+                    maxLines: 1,
+                  ),
+                ),
+              ],
+            ),
+          ),
+          TextButton(
+            onPressed: () {
+              Navigator.of(context).push(MaterialWidgetRoute(page: const ChooseAccountPage()));
+            },
+            style: buttonStyle,
+            child: Text(
+              zulipLocalizations.organizationsButtonLabel,
+              style: TextStyle(
+                fontSize: 19,
+                fontWeight: FontWeight.w500,
+                color: designVariables.icon,
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
 abstract class _MenuButton extends StatelessWidget {
   const _MenuButton();