From af77caa033c278346fd375dcfef17441cf43ab71 Mon Sep 17 00:00:00 2001
From: Lucas Reiners <luc.reiners@gmail.com>
Date: Fri, 8 Mar 2019 13:35:05 +0100
Subject: [PATCH] Added custom textstyle and edgeinsets callback

---
 lib/flutter_html.dart |  6 ++++++
 lib/html_parser.dart  | 25 +++++++++++++++++++++----
 2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/lib/flutter_html.dart b/lib/flutter_html.dart
index 49399c2fd4..f1554ba09a 100644
--- a/lib/flutter_html.dart
+++ b/lib/flutter_html.dart
@@ -13,6 +13,8 @@ class Html extends StatelessWidget {
     this.onLinkTap,
     this.renderNewlines = false,
     this.customRender,
+    this.customEdgeInsets,
+    this.customTextStyle,
     this.blockSpacing = 14.0,
     this.useRichText = false,
   }) : super(key: key);
@@ -29,6 +31,8 @@ class Html extends StatelessWidget {
   /// Either return a custom widget for specific node types or return null to
   /// fallback to the default rendering.
   final CustomRender customRender;
+  final CustomEdgeInsets customEdgeInsets;
+  final CustomTextStyle customTextStyle;
 
   @override
   Widget build(BuildContext context) {
@@ -45,6 +49,8 @@ class Html extends StatelessWidget {
                 width: width,
                 onLinkTap: onLinkTap,
                 renderNewlines: renderNewlines,
+                customEdgeInsets: customEdgeInsets,
+                customTextStyle: customTextStyle,
                 html: data,
               )
             : HtmlOldParser(
diff --git a/lib/html_parser.dart b/lib/html_parser.dart
index 9abe77bbc2..8365a56e19 100644
--- a/lib/html_parser.dart
+++ b/lib/html_parser.dart
@@ -6,6 +6,8 @@ import 'package:html/parser.dart' as parser;
 import 'package:html/dom.dart' as dom;
 
 typedef CustomRender = Widget Function(dom.Node node, List<Widget> children);
+typedef CustomTextStyle = TextStyle Function(dom.Node node, TextStyle baseStyle);
+typedef CustomEdgeInsets = EdgeInsets Function(dom.Node node);
 typedef OnLinkTap = void Function(String url);
 
 const OFFSET_TAGS_FONT_SIZE_FACTOR =
@@ -144,6 +146,8 @@ class HtmlRichTextParser extends StatelessWidget {
     this.onLinkTap,
     this.renderNewlines = false,
     this.html,
+    this.customTextStyle,
+    this.customEdgeInsets,
   });
 
   final double indentSize = 10.0;
@@ -152,6 +156,8 @@ class HtmlRichTextParser extends StatelessWidget {
   final onLinkTap;
   final bool renderNewlines;
   final String html;
+  final CustomTextStyle customTextStyle;
+  final CustomEdgeInsets customEdgeInsets;
 
   // style elements set a default style
   // for all child nodes
@@ -472,6 +478,14 @@ class HtmlRichTextParser extends StatelessWidget {
             nextContext.blockType = 'blockquote';
             break;
         }
+
+        if (customTextStyle != null) {
+          final TextStyle customStyle = customTextStyle(node, childStyle);
+          if (customStyle != null) {
+            childStyle = customStyle;
+          }
+        }
+
         nextContext.childStyle = childStyle;
       }
 
@@ -610,6 +624,11 @@ class HtmlRichTextParser extends StatelessWidget {
         parseContext.parentElement = null;
         TextAlign textAlign = TextAlign.left;
 
+        EdgeInsets _customEdgeInsets;
+        if (customEdgeInsets != null) {
+          _customEdgeInsets = customEdgeInsets(node);
+        }
+
         switch (node.localName) {
           case "hr":
             parseContext.rootWidgetList
@@ -715,10 +734,8 @@ class HtmlRichTextParser extends StatelessWidget {
               ));
             }
             BlockText blockText = BlockText(
-              margin: EdgeInsets.only(
-                  top: 8.0,
-                  bottom: 8.0,
-                  left: parseContext.indentLevel * indentSize),
+              margin: _customEdgeInsets ??
+                  EdgeInsets.only(top: 8.0, bottom: 8.0, left: parseContext.indentLevel * indentSize),
               padding: EdgeInsets.all(2.0),
               decoration: decoration,
               child: RichText(