Added a "Download finished" dialog.

lib/src/pages/main_page.dart

@@ -3,7 +3,6 @@ import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:quickgui/src/model/operating_system.dart';
 import 'package:quickgui/src/model/version.dart';
-import 'package:quickgui/src/pages/operating_system_page.dart';
 import 'package:quickgui/src/pages/operating_system_selection.dart';
 import 'package:quickgui/src/pages/version_selection.dart';
 import 'package:quickgui/src/widgets/home_page_button.dart';
@@ -95,9 +94,8 @@ class _MainPageState extends State<MainPage> {
                               : () async {
                                   showLoadingIndicator(text: 'Downloading');
                                   await Process.run('quickget', [_selectedOperatingSystem!.code!, _selectedVersion!.code!]);
-                                  print('Finished !');
+                                  hideLoadingIndicator();
-                                  hideOpenDialog();
+                                  showDoneDialog(operatingSystem: _selectedOperatingSystem!.code!, version: _selectedVersion!.code!);
-                                  Navigator.of(context).pop();
                                 },
                         ),
                       ],
@@ -148,7 +146,49 @@ class _MainPageState extends State<MainPage> {
     );
   }
 
-  void hideOpenDialog() {
+  void hideLoadingIndicator() {
     Navigator.of(context).pop();
   }
+
+  void showDoneDialog({required String operatingSystem, required String version}) {
+    showDialog(
+      context: context,
+      barrierDismissible: false,
+      builder: (context) => WillPopScope(
+        onWillPop: () async => false,
+        child: AlertDialog(
+          shape: const RoundedRectangleBorder(
+            borderRadius: BorderRadius.all(Radius.circular(8.0)),
+          ),
+          backgroundColor: Colors.black87,
+          content: SizedBox(
+            height: 200,
+            child: Column(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                Padding(
+                  padding: const EdgeInsets.symmetric(vertical: 32),
+                  child: Text('Done !', style: Theme.of(context).textTheme.bodyText1?.copyWith(color: Colors.white)),
+                ),
+                Text('Now run "quickemu --vm $operatingSystem-$version" to start the VM',
+                    style: Theme.of(context).textTheme.bodyText1?.copyWith(color: Colors.white)),
+                Padding(
+                  padding: const EdgeInsets.symmetric(vertical: 32),
+                  child: ElevatedButton(
+                    onPressed: () {
+                      Navigator.of(context).pop();
+                    },
+                    child: Text(
+                      'Dismiss',
+                      style: Theme.of(context).textTheme.bodyText1?.copyWith(color: Colors.white),
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
 }