add comment drafts

lib/main_common.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 
 import 'package:flutter/material.dart';
+import 'package:hive_flutter/adapters.dart';
 import 'package:logging/logging.dart';
 import 'package:provider/provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -19,6 +20,7 @@ Future<void> mainCommon(AppConfig appConfig) async {
 
   final logConsoleStore = LogConsolePageStore();
   final sharedPrefs = await SharedPreferences.getInstance();
+  await Hive.initFlutter();
 
   _setupLogger(appConfig, logConsoleStore);
   _setupTimeago();

lib/stores/comment_drafts_store.dart

@@ -0,0 +1,24 @@
+import 'package:hive/hive.dart';
+
+class CommentDraftStore {
+  static const _boxKey = 'comment_drafts';
+
+  static Future<String?> loadDraft(String apId) async {
+    final box = await Hive.openBox<String>(_boxKey);
+    final text = box.get(apId);
+    await box.close();
+    return text;
+  }
+
+  static Future<void> saveDraft(String apId, String text) async {
+    final box = await Hive.openBox<String>(_boxKey);
+    await box.put(apId, text);
+    await box.close();
+  }
+
+  static Future<void> removeDraft(String apId) async {
+    final box = await Hive.openBox<String>(_boxKey);
+    await box.delete(apId);
+    await box.close();
+  }
+}

lib/widgets/write_comment.dart

@@ -5,6 +5,7 @@ import 'package:lemmy_api_client/v3.dart';
 import '../hooks/delayed_loading.dart';
 import '../hooks/logged_in_action.dart';
 import '../l10n/l10n.dart';
+import '../stores/comment_drafts_store.dart';
 import 'editor/editor.dart';
 import 'markdown_mode_icon.dart';
 import 'markdown_text.dart';
@@ -40,6 +41,20 @@ class WriteComment extends HookWidget {
       text: _isEdit ? comment?.content : null,
     );
 
+    // load draft if exists
+    useEffect(() {
+      () async {
+        if (_isEdit) return;
+
+        final previousDraft =
+            await CommentDraftStore.loadDraft(comment?.apId ?? post.apId);
+        if (previousDraft != null) {
+          editorController.textEditingController.text = previousDraft;
+        }
+      }();
+      return null;
+    }, []);
+
     final preview = () {
       final body = () {
         final text = comment?.content ?? post.body;
@@ -84,6 +99,10 @@ class WriteComment extends HookWidget {
             ));
           }
         }();
+
+        // remove draft because it's not needed anymore
+        await CommentDraftStore.removeDraft(comment?.apId ?? post.apId);
+
         Navigator.of(context).pop(res.commentView);
       } catch (e) {
         ScaffoldMessenger.of(context).showSnackBar(
@@ -94,7 +113,17 @@ class WriteComment extends HookWidget {
 
     return Scaffold(
       appBar: AppBar(
-        leading: const CloseButton(),
+        leading: CloseButton(
+          onPressed: () async {
+            // save draft before closing
+            if (!_isEdit &&
+                editorController.textEditingController.text.trim().isNotEmpty) {
+              await CommentDraftStore.saveDraft(comment?.apId ?? post.apId,
+                  editorController.textEditingController.text);
+            }
+            Navigator.of(context).pop();
+          },
+        ),
         actions: [
           IconButton(
             icon: markdownModeIcon(fancy: showFancy.value),

pubspec.lock

@@ -350,6 +350,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
+  hive:
+    dependency: "direct main"
+    description:
+      name: hive
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.3"
+  hive_flutter:
+    dependency: "direct main"
+    description:
+      name: hive_flutter
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.0"
+  hive_generator:
+    dependency: "direct dev"
+    description:
+      name: hive_generator
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.3"
   http:
     dependency: transitive
     description:

pubspec.yaml

@@ -43,7 +43,8 @@ dependencies:
   provider: ^6.0.0
   mobx: ^2.0.4
   flutter_mobx: ^2.0.2
-
+  hive: ^2.2.3
+  hive_flutter: ^1.1.0
   # utils
   timeago: ^3.0.2
   fuzzy: ^0.4.0-nullsafety.0
@@ -71,6 +72,7 @@ dev_dependencies:
   build_runner: ^2.1.2
   mobx_codegen: ^2.0.2
   freezed: ^2.0.2
+  hive_generator: ^1.1.3
 
 flutter_icons:
   android: true