Support custom styles

app/lib/pages/home_page.dart

@@ -7,6 +7,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_quill/models/documents/document.dart';
 import 'package:flutter_quill/widgets/controller.dart';
+import 'package:flutter_quill/widgets/default_styles.dart';
 import 'package:flutter_quill/widgets/editor.dart';
 import 'package:flutter_quill/widgets/toolbar.dart';
 
@@ -84,6 +85,7 @@ class _HomePageState extends State<HomePage> {
               enableInteractiveSelection: true,
               expands: false,
               padding: EdgeInsets.zero,
+              customStyles: DefaultStyles(sizeSmall: TextStyle(fontSize: 9.0)),
             ),
           ),
         ),

lib/widgets/editor.dart

@@ -104,6 +104,7 @@ class QuillEditor extends StatefulWidget {
   final bool enableInteractiveSelection;
   final double minHeight;
   final double maxHeight;
+  final DefaultStyles customStyles;
   final bool expands;
   final TextCapitalization textCapitalization;
   final Brightness keyboardAppearance;
@@ -123,6 +124,7 @@ class QuillEditor extends StatefulWidget {
       this.enableInteractiveSelection,
       this.minHeight,
       this.maxHeight,
+      this.customStyles,
       @required this.expands,
       this.textCapitalization = TextCapitalization.sentences,
       this.keyboardAppearance = Brightness.light,
@@ -242,6 +244,7 @@ class _QuillEditorState extends State<QuillEditor>
           widget.textCapitalization,
           widget.maxHeight,
           widget.minHeight,
+          widget.customStyles,
           widget.expands,
           widget.autoFocus,
           selectionColor,

lib/widgets/raw_editor.dart

@@ -40,6 +40,7 @@ class RawEditor extends StatefulWidget {
   final TextCapitalization textCapitalization;
   final double maxHeight;
   final double minHeight;
+  final DefaultStyles customStyles;
   final bool expands;
   final bool autoFocus;
   final Color selectionColor;
@@ -65,6 +66,7 @@ class RawEditor extends StatefulWidget {
       this.textCapitalization,
       this.maxHeight,
       this.minHeight,
+      this.customStyles,
       this.expands,
       this.autoFocus,
       this.selectionColor,
@@ -683,6 +685,10 @@ class RawEditorState extends EditorState
         ? defaultStyles.merge(parentStyles)
         : defaultStyles;
 
+    if (widget.customStyles != null) {
+      _styles = _styles.merge(widget.customStyles);
+    }
+
     if (!_didAutoFocus && widget.autoFocus) {
       FocusScope.of(context).autofocus(widget.focusNode);
       _didAutoFocus = true;