Optimize parsing

lib/ui/widgets/text_widget.dart

@@ -11,7 +11,7 @@ import 'package:url_launcher/url_launcher.dart';
 ///
 /// @author Pierre Hubert
 
-class TextWidget extends StatelessWidget {
+class TextWidget extends StatefulWidget {
   final String content;
   final bool parseBBcode;
   final TextStyle style;
@@ -25,26 +25,40 @@ class TextWidget extends StatelessWidget {
         assert(parseBBcode != null),
         super(key: key);
 
+  @override
+  _TextWidgetState createState() => _TextWidgetState();
+}
+
+class _TextWidgetState extends State<TextWidget> {
+  Widget _cache;
+
   @override
   Widget build(BuildContext context) {
-    var content = EmojiParser().emojify(this.content);
+    if (_cache == null) _cache = doBuild();
+
+    return _cache;
+  }
+
+  Widget doBuild() {
+    var content = EmojiParser().emojify(this.widget.content);
 
     // Parse BBcode
-    if (this.parseBBcode)
+    if (this.widget.parseBBcode)
       return BBCodeParsedWidget(
         text: content,
-        parseCallback: (style, text) => _parseLinks(context, text, style),
+        parseCallback: (style, text) => _parseLinks(text, style),
       );
 
     // Just parse link
     return RichText(
-      text: TextSpan(children: _parseLinks(context, content, style)),
+      text: TextSpan(children: _parseLinks(content, widget.style)),
     );
   }
 
   /// Sub parse function
-  List<InlineSpan> _parseLinks(
-      BuildContext context, String text, TextStyle style) {
+  List<InlineSpan> _parseLinks(String text, TextStyle style) {
+    if (style == null) style = TextStyle();
+
     var buff = StringBuffer();
     final list = new List<InlineSpan>();