✨ Better theme & background image

lib/widgets/root_container.dart

@@ -1,4 +1,8 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:solian/platform.dart';
 
 class RootContainer extends StatelessWidget {
   final Widget? child;
@@ -7,9 +11,38 @@ class RootContainer extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Material(
-      color: Theme.of(context).colorScheme.surface,
-      child: child,
+    return FutureBuilder(
+      future: PlatformInfo.isWeb
+          ? Future.value(null)
+          : getApplicationDocumentsDirectory(),
+      builder: (context, snapshot) {
+        if (snapshot.hasData) {
+          final path = '${snapshot.data!.path}/app_background_image';
+          final file = File(path);
+          if (file.existsSync()) {
+            return Material(
+              color: Theme.of(context).colorScheme.surface,
+              child: Container(
+                decoration: BoxDecoration(
+                  backgroundBlendMode: BlendMode.darken,
+                  color: Theme.of(context).colorScheme.surface,
+                  image: DecorationImage(
+                    opacity: 0.5,
+                    image: FileImage(file),
+                    fit: BoxFit.cover,
+                  ),
+                ),
+                child: child,
+              ),
+            );
+          }
+        }
+
+        return Material(
+          color: Theme.of(context).colorScheme.surface,
+          child: child,
+        );
+      },
     );
   }
 }