SFTP support download. listDIr() support rollback.

lib/data/res/build_data.dart

@@ -2,9 +2,9 @@
 
 class BuildData {
   static const String name = "ServerBox";
-  static const int build = 107;
+  static const int build = 108;
   static const String engine =
       "Flutter 2.10.3 • channel stable • https://github.com/flutter/flutter.git\nFramework • revision 7e9793dee1 (8 days ago) • 2022-03-02 11:23:12 -0600\nEngine • revision bd539267b4\nTools • Dart 2.16.1 • DevTools 2.9.2\n";
-  static const String buildAt = "2022-03-10 13:25:24.362670";
-  static const int modifications = 11;
+  static const String buildAt = "2022-03-10 15:25:32.032568";
+  static const int modifications = 0;
 }

lib/view/page/ping.dart

@@ -18,8 +18,8 @@ class PingPage extends StatefulWidget {
 class _PingPageState extends State<PingPage>
     with AutomaticKeepAliveClientMixin {
   late TextEditingController _textEditingController;
-  String _result = '';
   Ping? _ping;
+  late MediaQueryData _media;
 
   @override
   void initState() {
@@ -33,6 +33,7 @@ class _PingPageState extends State<PingPage>
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
+    _media = MediaQuery.of(context);
   }
 
   @override
@@ -46,13 +47,12 @@ class _PingPageState extends State<PingPage>
               const SizedBox(height: 13),
               buildInput(context, _textEditingController, maxLines: 1),
               _buildControl(),
-              RoundRectCard(
-                SizedBox(
-                  width: double.infinity,
-                  child: Padding(
-                      padding: const EdgeInsets.all(7), child: Text(_result)),
+              RoundRectCard(ConstrainedBox(
+                constraints: BoxConstraints(
+                  minWidth: double.infinity,
+                  minHeight: _media.size.height * 0.6,
                 ),
-              ),
+              )),
             ])),
         onTap: () => FocusScope.of(context).requestFocus(FocusNode()),
       ),
@@ -60,12 +60,10 @@ class _PingPageState extends State<PingPage>
   }
 
   void doPing() {
-    _result = '';
     _ping = Ping(_textEditingController.text.trim());
     _ping!.stream.listen((event) {
       final resp = event.response.toString();
       if (resp == 'null') return;
-      _result += '$resp\n';
       setState(() {});
     });
   }

lib/view/page/sftp.dart

@@ -1,5 +1,8 @@
+import 'dart:io';
+
 import 'package:dartssh2/dartssh2.dart';
 import 'package:flutter/material.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:toolbox/core/utils.dart';
 import 'package:toolbox/data/model/server/server_connection_state.dart';
 import 'package:toolbox/data/model/server/server_private_info.dart';
@@ -7,6 +10,7 @@ import 'package:toolbox/data/model/sftp/absolute_path.dart';
 import 'package:toolbox/data/model/sftp/sftp_side_status.dart';
 import 'package:toolbox/data/provider/server.dart';
 import 'package:toolbox/locator.dart';
+import 'package:toolbox/view/widget/center_loading.dart';
 import 'package:toolbox/view/widget/fade_in.dart';
 import 'package:toolbox/view/widget/two_line_text.dart';
 
@@ -144,6 +148,11 @@ class _SFTPPageState extends State<SFTPPage> {
               title: const Text('Rename'),
               onTap: () => rename(context, file),
             ),
+            ListTile(
+              leading: const Icon(Icons.download),
+              title: const Text('Download'),
+              onTap: () => download(context, file),
+            )
           ],
         ),
         [
@@ -153,6 +162,42 @@ class _SFTPPageState extends State<SFTPPage> {
         ]);
   }
 
+  void download(BuildContext context, SftpName name) {
+    showRoundDialog(
+        context, 'Download', Text('Download ${name.filename} to local?'), [
+      TextButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: const Text('Cancel')),
+      TextButton(
+          onPressed: () async {
+            var result = '';
+            try {
+              Navigator.of(context).pop();
+              showRoundDialog(context, name.filename, centerSizedLoading, [],
+                  barrierDismiss: false);
+              final path = await getApplicationDocumentsDirectory();
+              final localFile = File('${path.path}/${name.filename}');
+              final remotePath = _status.path!.path + '/' + name.filename;
+              final file = await _status.client?.open(remotePath);
+              localFile.writeAsBytes(await file!.readBytes());
+              Navigator.of(context).pop();
+            } catch (e) {
+              result = e.toString();
+            } finally {
+              if (result.isEmpty) {
+                result = 'Donwloaded successfully.';
+              }
+              showRoundDialog(context, 'Result', Text(result), [
+                TextButton(
+                    onPressed: () => Navigator.of(context).pop(),
+                    child: const Text('OK'))
+              ]);
+            }
+          },
+          child: const Text('Download'))
+    ]);
+  }
+
   void delete(BuildContext context, SftpName file) {
     Navigator.of(context).pop();
     showRoundDialog(
@@ -274,15 +319,26 @@ class _SFTPPageState extends State<SFTPPage> {
       final sftpc = await client.sftp();
       _status.client = sftpc;
     }
-    final fs =
-        await _status.client!.listdir(path ?? (_status.path?.path ?? '/'));
-    fs.sort((a, b) => a.filename.compareTo(b.filename));
-    fs.removeAt(0);
-    if (mounted) {
-      setState(() {
-        _status.files = fs;
-        _status.isBusy = false;
-      });
+    try {
+      final fs =
+          await _status.client!.listdir(path ?? (_status.path?.path ?? '/'));
+      fs.sort((a, b) => a.filename.compareTo(b.filename));
+      fs.removeAt(0);
+      if (mounted) {
+        setState(() {
+          _status.files = fs;
+          _status.isBusy = false;
+        });
+      }
+    } catch (e) {
+      await showRoundDialog(context, 'Error', Text(e.toString()), [
+        TextButton(
+            onPressed: () => Navigator.of(context).pop(),
+            child: const Text('OK'))
+      ]);
+      if (_status.path!.undo()) {
+        await listDir();
+      }
     }
   }
 

lib/view/widget/center_loading.dart

@@ -1,3 +1,11 @@
 import 'package:flutter/material.dart';
 
 const centerLoading = Center(child: CircularProgressIndicator());
+
+const centerSizedLoading = SizedBox(
+  width: 77,
+  height: 77,
+  child: Center(
+    child: CircularProgressIndicator(),
+  ),
+);