Cache parsed emojies

lib/helpers/comments_helper.dart

@@ -1,5 +1,6 @@
 import 'package:comunic/models/api_request.dart';
 import 'package:comunic/models/comment.dart';
+import 'package:comunic/models/displayed_content.dart';
 import 'package:comunic/models/new_comment.dart';
 
 /// Comments helper
@@ -64,7 +65,7 @@ class CommentsHelper {
       userID: entry["userID"],
       postID: entry["postID"],
       timeSent: entry["time_sent"],
-      content: entry["content"],
+      content: DisplayedString(entry["content"]),
       imageURL: entry["img_url"],
       likes: entry["likes"],
       userLike: entry["userlike"],

lib/helpers/posts_helper.dart

@@ -7,6 +7,7 @@ import 'package:comunic/helpers/survey_helper.dart';
 import 'package:comunic/lists/comments_list.dart';
 import 'package:comunic/lists/posts_list.dart';
 import 'package:comunic/models/api_request.dart';
+import 'package:comunic/models/displayed_content.dart';
 import 'package:comunic/models/new_post.dart';
 import 'package:comunic/models/post.dart';
 
@@ -206,7 +207,7 @@ class PostsHelper {
         userPageID: map["user_page_id"],
         groupID: map["group_id"],
         timeSent: map["post_time"],
-        content: map["content"],
+        content: DisplayedString(map["content"]),
         visibilityLevel: _APIPostsVisibilityLevelMap[map["visibility_level"]],
         kind: postKind,
         fileSize: map["file_size"],

lib/models/comment.dart

@@ -1,7 +1,8 @@
 import 'package:comunic/enums/likes_type.dart';
+import 'package:comunic/models/displayed_content.dart';
 import 'package:comunic/models/like_element.dart';
-import 'package:meta/meta.dart';
 import 'package:comunic/utils/account_utils.dart' as account;
+import 'package:meta/meta.dart';
 
 /// Comments
 ///
@@ -14,7 +15,7 @@ class Comment implements LikeElement {
   final int userID;
   final int postID;
   final int timeSent;
-  String content;
+  DisplayedString content;
   final String imageURL;
   int likes;
   bool userLike;
@@ -36,7 +37,8 @@ class Comment implements LikeElement {
         assert(likes != null),
         assert(userLike != null);
 
-  bool get hasContent => content != null && content.length > 0;
+  bool get hasContent =>
+      content != null && !content.isNull && content.length > 0;
 
   bool get hasImage => imageURL != null;
 

lib/models/displayed_content.dart

@@ -0,0 +1,38 @@
+import 'package:flutter_emoji/flutter_emoji.dart';
+
+/// Optimized colons Emoji-parsed string
+///
+/// @author Pierre Hubert
+
+class DisplayedString {
+  String _string;
+  String _parseCache;
+
+  DisplayedString(this._string);
+
+  int get length => _string.length;
+
+  bool get isEmpty => _string.isEmpty;
+
+  bool get isNull => _string == null;
+
+  String get content => _string;
+
+  set content(String content) {
+    _string = content;
+    _parseCache = null;
+  }
+
+  @override
+  String toString() {
+    return _string;
+  }
+
+  String get parsedString {
+    if (_parseCache == null) {
+      _parseCache = EmojiParser().emojify(this._string);
+    }
+
+    return _parseCache;
+  }
+}

lib/models/post.dart

@@ -3,6 +3,7 @@ import 'package:comunic/enums/post_kind.dart';
 import 'package:comunic/enums/post_visibility_level.dart';
 import 'package:comunic/enums/user_access_levels.dart';
 import 'package:comunic/lists/comments_list.dart';
+import 'package:comunic/models/displayed_content.dart';
 import 'package:comunic/models/like_element.dart';
 import 'package:comunic/models/survey.dart';
 import 'package:meta/meta.dart';
@@ -17,7 +18,7 @@ class Post implements LikeElement {
   final int userPageID;
   final int groupID;
   final int timeSent;
-  String content;
+  DisplayedString content;
   PostVisibilityLevel visibilityLevel;
   final PostKind kind;
   final int fileSize;
@@ -73,7 +74,7 @@ class Post implements LikeElement {
 
   bool get isGroupPost => groupID != null && groupID > 0;
 
-  bool get hasContent => content != null;
+  bool get hasContent => content != null && !content.isNull;
 
   bool get hasComments => comments != null;
 

lib/ui/tiles/post_tile.dart

@@ -521,7 +521,7 @@ class _PostTileState extends State<PostTile> {
       context: context,
       title: tr("Update comment content"),
       message: tr("New content:"),
-      defaultValue: comment.content,
+      defaultValue: comment.content.isNull ? "" : comment.content.content,
       hint: tr("New content..."),
     );
 
@@ -529,7 +529,7 @@ class _PostTileState extends State<PostTile> {
       return showSimpleSnack(context, tr("Could not update comment content!"));
 
     setState(() {
-      comment.content = newContent;
+      comment.content.content = newContent;
     });
   }
 
@@ -591,7 +591,7 @@ class _PostTileState extends State<PostTile> {
       context: context,
       title: tr("Update post content"),
       message: tr("Please enter message content: "),
-      defaultValue: widget.post.content == null ? "" : widget.post.content,
+      defaultValue: widget.post.content.isNull == null ? "" : widget.post.content.content,
       hint: tr("Post content"),
     );
 
@@ -602,7 +602,7 @@ class _PostTileState extends State<PostTile> {
       return;
     }
 
-    setState(() => widget.post.content = newContent);
+    setState(() => widget.post.content.content = newContent);
   }
 
   /// Perform the deletion of the post

lib/ui/widgets/text_widget.dart

@@ -1,8 +1,8 @@
+import 'package:comunic/models/displayed_content.dart';
 import 'package:comunic/utils/bbcode_parser.dart';
 import 'package:comunic/utils/input_utils.dart';
 import 'package:comunic/utils/navigation_utils.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter_emoji/flutter_emoji.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 /// Text widget
@@ -11,8 +11,8 @@ import 'package:url_launcher/url_launcher.dart';
 ///
 /// @author Pierre Hubert
 
-class TextWidget extends StatefulWidget {
+class TextWidget extends StatelessWidget {
-  final String content;
+  final DisplayedString content;
   final bool parseBBcode;
   final TextStyle style;
 
@@ -25,38 +25,28 @@ class TextWidget extends StatefulWidget {
         assert(parseBBcode != null),
         super(key: key);
 
-  @override
-  _TextWidgetState createState() => _TextWidgetState();
-}
-
-class _TextWidgetState extends State<TextWidget> {
-  Widget _cache;
-
   @override
   Widget build(BuildContext context) {
-    if (_cache == null) _cache = doBuild();
+    if (this.content.isNull || this.content.isEmpty) return Text("");
 
-    return _cache;
+    var content = this.content.parsedString;
-  }
-
-  Widget doBuild() {
-    var content = EmojiParser().emojify(this.widget.content);
 
     // Parse BBcode
-    if (this.widget.parseBBcode)
+    if (parseBBcode)
       return BBCodeParsedWidget(
         text: content,
-        parseCallback: (style, text) => _parseLinks(text, style),
+        parseCallback: (style, text) => _parseLinks(context, text, style),
       );
 
     // Just parse link
     return RichText(
-      text: TextSpan(children: _parseLinks(content, widget.style)),
+      text: TextSpan(children: _parseLinks(context, content, style)),
     );
   }
 
   /// Sub parse function
-  List<InlineSpan> _parseLinks(String text, TextStyle style) {
+  List<InlineSpan> _parseLinks(
+      BuildContext context, String text, TextStyle style) {
     if (style == null) style = TextStyle();
 
     var buff = StringBuffer();