Refactoring : extracted many widgets from downloader

lib/src/pages/downloader.dart

@@ -7,6 +7,9 @@ import 'package:quickgui/src/globals.dart';
 import 'package:quickgui/src/model/operating_system.dart';
 import 'package:quickgui/src/model/option.dart';
 import 'package:quickgui/src/model/version.dart';
+import 'package:quickgui/src/widgets/cancel_dismiss_button.dart';
+import 'package:quickgui/src/widgets/download_label.dart';
+import 'package:quickgui/src/widgets/download_progress_bar.dart';
 
 class Downloader extends StatefulWidget {
   const Downloader({
@@ -89,7 +92,8 @@ class _DownloaderState extends State<Downloader> {
     return Scaffold(
       appBar: AppBar(
         title: Text(
-            'Downloading ${widget.operatingSystem.name} ${widget.version.version}' + (widget.option!.option.isNotEmpty ? ' (${widget.option!.option})' : '')),
+          'Downloading ${widget.operatingSystem.name} ${widget.version.version}' + (widget.option!.option.isNotEmpty ? ' (${widget.option!.option})' : ''),
+        ),
         automaticallyImplyLeading: false,
       ),
       body: Column(
@@ -102,30 +106,14 @@ class _DownloaderState extends State<Downloader> {
                 return Column(
                   mainAxisAlignment: MainAxisAlignment.center,
                   children: [
-                    Padding(
-                      padding: const EdgeInsets.all(8.0),
-                      child: _downloadFinished
-                          ? const Text('Download finished.')
-                          : snapshot.hasData
-                              ? widget.option!.downloader != 'zsync'
-                                  ? widget.option!.downloader == 'wget'
-                                      ? Text('Downloading...${(snapshot.data! * 100).toInt()}%')
-                                      : Text('${snapshot.data} Mbs downloaded')
-                                  : const Text("Downloading (no progress available)...")
-                              : const Text('Waiting for download to start'),
+                    DownloadLabel(
+                      downloadFinished: _downloadFinished,
+                      data: snapshot.hasData ? snapshot.data : null,
+                      downloader: widget.option!.downloader,
                     ),
-                    Padding(
-                      padding: const EdgeInsets.all(8.0),
-                      child: SizedBox(
-                        width: 200,
-                        child: LinearProgressIndicator(
-                          value: _downloadFinished
-                              ? 1
-                              : snapshot.hasData
-                                  ? data
-                                  : null,
-                        ),
-                      ),
+                    DownloadProgressBar(
+                      downloadFinished: _downloadFinished,
+                      data: snapshot.hasData ? data : null,
                     ),
                     Padding(
                       padding: const EdgeInsets.only(top: 32),
@@ -136,20 +124,8 @@ class _DownloaderState extends State<Downloader> {
               },
             ),
           ),
-          Padding(
-            padding: const EdgeInsets.all(8.0),
-            child: Row(
-              mainAxisAlignment: MainAxisAlignment.center,
-              children: [
-                ElevatedButton(
-                    onPressed: _downloadFinished
-                        ? () {
-                            Navigator.of(context).pop();
-                          }
-                        : null,
-                    child: _downloadFinished ? const Text('Dimiss') : const Text('Cancel'))
-              ],
-            ),
+          CancelDismissButton(
+            downloadFinished: _downloadFinished,
           ),
         ],
       ),

lib/src/widgets/cancel_dismiss_button.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/material.dart';
+
+class CancelDismissButton extends StatelessWidget {
+  const CancelDismissButton({
+    Key? key,
+    required this.downloadFinished,
+  }) : super(key: key);
+
+  final bool downloadFinished;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(8.0),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          ElevatedButton(
+            onPressed: !downloadFinished
+                ? null
+                : () {
+                    Navigator.of(context).pop();
+                  },
+            child: downloadFinished ? const Text('Dimiss') : const Text('Cancel'),
+          )
+        ],
+      ),
+    );
+  }
+}

lib/src/widgets/download_label.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+
+class DownloadLabel extends StatelessWidget {
+  const DownloadLabel({Key? key, required this.downloadFinished, required this.data, required this.downloader}) : super(key: key);
+
+  final bool downloadFinished;
+  final double? data;
+  final String downloader;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(8.0),
+      child: downloadFinished
+          ? const Text('Download finished.')
+          : data != null
+              ? downloader != 'zsync'
+                  ? downloader == 'wget'
+                      ? Text('Downloading...${(data! * 100).toInt()}%')
+                      : Text('$data Mbs downloaded')
+                  : const Text("Downloading (no progress available)...")
+              : const Text('Waiting for download to start'),
+    );
+  }
+}

lib/src/widgets/download_progress_bar.dart

@@ -0,0 +1,25 @@
+import 'package:flutter/material.dart';
+
+class DownloadProgressBar extends StatelessWidget {
+  const DownloadProgressBar({
+    Key? key,
+    required this.downloadFinished,
+    required this.data,
+  }) : super(key: key);
+
+  final bool downloadFinished;
+  final double? data;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(8.0),
+      child: SizedBox(
+        width: 200,
+        child: LinearProgressIndicator(
+          value: downloadFinished ? 1 : data,
+        ),
+      ),
+    );
+  }
+}