feat: sftp perm setting & path copy (#467)

lib/view/widget/unix_perm.dart

@@ -0,0 +1,128 @@
+import 'package:fl_lib/fl_lib.dart';
+import 'package:flutter/material.dart';
+
+final class RWX {
+  final bool r;
+  final bool w;
+  final bool x;
+
+  const RWX({
+    required this.r,
+    required this.w,
+    required this.x,
+  });
+
+  RWX copyWith({bool? r, bool? w, bool? x}) {
+    return RWX(r: r ?? this.r, w: w ?? this.w, x: x ?? this.x);
+  }
+
+  int get value {
+    return (r ? 4 : 0) + (w ? 2 : 0) + (x ? 1 : 0);
+  }
+}
+
+final class UnixPerm {
+  final RWX user;
+  final RWX group;
+  final RWX other;
+
+  const UnixPerm({
+    required this.user,
+    required this.group,
+    required this.other,
+  });
+
+  UnixPerm copyWith({RWX? user, RWX? group, RWX? other}) {
+    return UnixPerm(
+      user: user ?? this.user,
+      group: group ?? this.group,
+      other: other ?? this.other,
+    );
+  }
+
+  /// eg.: 744
+  String get perm {
+    return '${user.value}${group.value}${other.value}';
+  }
+
+  static UnixPerm get empty => const UnixPerm(
+        user: RWX(r: false, w: false, x: false),
+        group: RWX(r: false, w: false, x: false),
+        other: RWX(r: false, w: false, x: false),
+      );
+}
+
+final class UnixPermEditor extends StatefulWidget {
+  final UnixPerm perm;
+  final void Function(UnixPerm) onChanged;
+  const UnixPermEditor(
+      {super.key, required this.perm, required this.onChanged});
+
+  @override
+  _UnixPermEditorState createState() => _UnixPermEditorState();
+}
+
+final class _UnixPermEditorState extends State<UnixPermEditor> {
+  late UnixPerm perm;
+
+  @override
+  void initState() {
+    super.initState();
+    perm = widget.perm;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        const Row(
+          mainAxisAlignment: MainAxisAlignment.spaceAround,
+          children: [
+            Text('R'),
+            Text('W'),
+            Text('X'),
+          ],
+        ).paddingOnly(left: 13),
+        UIs.height7,
+        _buildRow('U', perm.user),
+        _buildRow('G', perm.group),
+        _buildRow('O', perm.other),
+      ],
+    );
+  }
+
+  Widget _buildRow(String title, RWX rwx) {
+    return Row(
+      mainAxisAlignment: MainAxisAlignment.spaceBetween,
+      children: [
+        SizedBox(width: 7, child: Text(title)),
+        _buildSwitch(rwx.r, (v) {
+          setState(() {
+            perm = perm.copyWith(user: rwx.copyWith(r: v));
+          });
+          widget.onChanged(perm);
+        }),
+        _buildSwitch(rwx.w, (v) {
+          setState(() {
+            perm = perm.copyWith(user: rwx.copyWith(w: v));
+          });
+          widget.onChanged(perm);
+        }),
+        _buildSwitch(rwx.x, (v) {
+          setState(() {
+            perm = perm.copyWith(user: rwx.copyWith(x: v));
+          });
+          widget.onChanged(perm);
+        }),
+      ],
+    );
+  }
+
+  Widget _buildSwitch(bool value, void Function(bool) onChanged) {
+    return Switch(
+      value: value,
+      onChanged: onChanged,
+    );
+  }
+}