Updated deprecated code, added check for svg files, fixed visibility of buttons in download page

lib/src/mixins/preferences_mixin.dart

@@ -31,6 +31,7 @@ mixin PreferencesMixin {
         return prefs.getStringList(key) as T;
       }
     }
+    return null;
   }
 
   Future<void> deletePreference(String key) async {

lib/src/pages/operating_system_selection.dart

@@ -74,11 +74,18 @@ class _OperatingSystemSelectionState extends State<OperatingSystemSelection> {
               itemCount: list.length,
               itemBuilder: (context, index) {
                 var item = list[index];
-                var icon = SvgPicture.asset(
-                  "assets/quickemu-icons/${item.code}.svg",
-                  width: 32,
-                  height: 32,
-                );
+                Widget icon;
+
+                try {
+                  icon = SvgPicture.asset(
+                    "assets/quickemu-icons/${item.code}.svg",
+                    width: 32,
+                    height: 32,
+                  );
+                } catch (e) {
+                  // Replace with generic icon
+                  icon = const Icon(Icons.computer, size: 32);
+                }
                 return Card(
                   child: ListTile(
                     title: Text(item.name),

lib/src/widgets/downloader/cancel_dismiss_button.dart

@@ -20,8 +20,8 @@ class CancelDismissButton extends StatelessWidget {
         children: [
           ElevatedButton(
             style: ElevatedButton.styleFrom(
-              primary: Theme.of(context).colorScheme.surface,
-              onPrimary: Theme.of(context).brightness == Brightness.dark
+              backgroundColor: Theme.of(context).colorScheme.surface,
+              foregroundColor: Theme.of(context).brightness == Brightness.dark
                   ? Colors.white70
                   : Theme.of(context).colorScheme.primary,
             ),

lib/src/widgets/home_page/downloader_page_button.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+
+class DownloaderPageButton extends StatelessWidget {
+  const DownloaderPageButton({
+    Key? key,
+    this.label,
+    required this.text,
+    this.onPressed,
+  }) : super(key: key);
+
+  final String? label;
+  final String text;
+  final VoidCallback? onPressed;
+
+  @override
+  Widget build(BuildContext context) {
+    return Expanded(
+      flex: 1,
+      child: Padding(
+        padding: const EdgeInsets.fromLTRB(12, 0, 12, 0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            Padding(
+              padding: const EdgeInsets.all(4.0),
+              child: Center(
+                child: Text(
+                  label?.toUpperCase() ?? '',
+                  style: Theme.of(context)
+                      .textTheme
+                      .titleSmall
+                      ?.copyWith(color: Colors.white),
+                ),
+              ),
+            ),
+            ElevatedButton(
+              style: ElevatedButton.styleFrom(
+                foregroundColor: Theme.of(context).brightness == Brightness.dark
+                    ? Colors.white70
+                    : Theme.of(context).colorScheme.primary,
+                backgroundColor: Theme.of(context).canvasColor,
+              ),
+              onPressed: onPressed,
+              child: Padding(
+                padding: const EdgeInsets.fromLTRB(0, 16, 0, 16),
+                child: Text(text),
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/src/widgets/home_page/home_page_button.dart

@@ -21,22 +21,19 @@ class HomePageButton extends StatelessWidget {
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.stretch,
           children: [
-            Padding(
-              padding: const EdgeInsets.only(bottom: 24),
-              child: Center(
-                child: Text(
-                  label?.toUpperCase() ?? '',
-                  style: Theme.of(context)
-                      .textTheme
-                      .subtitle2
-                      ?.copyWith(color: Colors.white),
-                ),
+            Center(
+              child: Text(
+                label?.toUpperCase() ?? '',
+                style: Theme.of(context)
+                    .textTheme
+                    .titleSmall
+                    ?.copyWith(color: Colors.white),
               ),
             ),
             ElevatedButton(
               style: ElevatedButton.styleFrom(
-                primary: Theme.of(context).canvasColor,
-                onPrimary: Theme.of(context).brightness == Brightness.dark
+                backgroundColor: Theme.of(context).canvasColor,
+                foregroundColor: Theme.of(context).brightness == Brightness.dark
                     ? Colors.white70
                     : Theme.of(context).colorScheme.primary,
               ),

lib/src/widgets/home_page/home_page_button_group.dart

@@ -1,8 +1,8 @@
 import 'dart:io';
 
 import 'package:flutter/material.dart';
-import 'package:tuple/tuple.dart';
 import 'package:gettext_i18n/gettext_i18n.dart';
+import 'package:tuple/tuple.dart';
 
 import '../../model/operating_system.dart';
 import '../../model/option.dart';
@@ -10,7 +10,7 @@ import '../../model/version.dart';
 import '../../pages/downloader.dart';
 import '../../pages/operating_system_selection.dart';
 import '../../pages/version_selection.dart';
-import '../home_page/home_page_button.dart';
+import 'downloader_page_button.dart';
 
 class HomePageButtonGroup extends StatefulWidget {
   const HomePageButtonGroup({Key? key}) : super(key: key);
@@ -33,7 +33,7 @@ class _HomePageButtonGroupState extends State<HomePageButtonGroup> {
     }
     return Row(
       children: [
-        HomePageButton(
+        DownloaderPageButton(
           label: context.t("Operating system"),
           text: _selectedOperatingSystem?.name ?? context.t('Select...'),
           onPressed: () {
@@ -58,7 +58,7 @@ class _HomePageButtonGroupState extends State<HomePageButtonGroup> {
             });
           },
         ),
-        HomePageButton(
+        DownloaderPageButton(
           label: context.t('Version'),
           text: _versionButtonLabel, //_selectedVersion?.version ?? 'Select...',
           onPressed: (_selectedOperatingSystem != null)
@@ -80,7 +80,7 @@ class _HomePageButtonGroupState extends State<HomePageButtonGroup> {
                 }
               : null,
         ),
-        HomePageButton(
+        DownloaderPageButton(
           label: context.t('Download'),
           text: context.t('Download'),
           onPressed: (_selectedVersion == null)
@@ -122,7 +122,7 @@ class _HomePageButtonGroupState extends State<HomePageButtonGroup> {
                   child: Text(context.t('Downloading...'),
                       style: Theme.of(context)
                           .textTheme
-                          .bodyText1
+                          .bodyLarge
                           ?.copyWith(color: Colors.white)),
                 ),
                 const CircularProgressIndicator(),
@@ -132,7 +132,7 @@ class _HomePageButtonGroupState extends State<HomePageButtonGroup> {
                     'Target : ${Directory.current.absolute.path}',
                     style: Theme.of(context)
                         .textTheme
-                        .bodyText1
+                        .bodyLarge
                         ?.copyWith(color: Colors.white),
                   ),
                 ),
@@ -170,7 +170,7 @@ class _HomePageButtonGroupState extends State<HomePageButtonGroup> {
                   child: Text(context.t('Done !'),
                       style: Theme.of(context)
                           .textTheme
-                          .bodyText1
+                          .bodyLarge
                           ?.copyWith(color: Colors.white)),
                 ),
                 Text(
@@ -178,7 +178,7 @@ class _HomePageButtonGroupState extends State<HomePageButtonGroup> {
                         args: ["quickemu --vm $operatingSystem-$version"]),
                     style: Theme.of(context)
                         .textTheme
-                        .bodyText1
+                        .bodyLarge
                         ?.copyWith(color: Colors.white)),
                 Padding(
                   padding: const EdgeInsets.symmetric(vertical: 32),
@@ -190,7 +190,7 @@ class _HomePageButtonGroupState extends State<HomePageButtonGroup> {
                       'Dismiss',
                       style: Theme.of(context)
                           .textTheme
-                          .bodyText1
+                          .bodyLarge
                           ?.copyWith(color: Colors.white),
                     ),
                   ),

lib/src/widgets/home_page/logo.dart

@@ -8,7 +8,7 @@ class Logo extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return SizedBox(
-      height: 250,
+      height: 230,
       child: Flex(
         direction: Axis.vertical,
         children: [

lib/src/widgets/left_menu.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
-import 'package:provider/provider.dart';
 import 'package:gettext_i18n/gettext_i18n.dart';
+import 'package:provider/provider.dart';
 import 'package:quickgui/src/supported_locales.dart';
 
 import '../globals.dart';
@@ -46,7 +46,7 @@ class _LeftMenuState extends State<LeftMenu> with PreferencesMixin {
             children: [
               ListTile(
                 title: Text("quickgui $_version",
-                    style: Theme.of(context).textTheme.headline6),
+                    style: Theme.of(context).textTheme.titleLarge),
               ),
               const Divider(),
               Padding(