Added more options to ZefyrThemeData.

- Added the parameter horizontalRuleColor to ZefyrThemeData.
- Added the parameter backgroundColor to quote and code BlockTheme

packages/zefyr/lib/src/widgets/code.dart

@@ -28,7 +28,7 @@ class ZefyrCode extends StatelessWidget {
       child: new Container(
         // TODO: make decorations configurable
         decoration: BoxDecoration(
-          color: Colors.blueGrey.shade50,
+          color: theme.blockTheme.code.backgroundColor,
           borderRadius: BorderRadius.circular(3.0),
         ),
         padding: const EdgeInsets.all(16.0),

packages/zefyr/lib/src/widgets/horizontal_rule.dart

@@ -9,6 +9,7 @@ import 'package:flutter/widgets.dart';
 import 'package:notus/notus.dart';
 
 import 'editable_box.dart';
+import 'theme.dart';
 
 class ZefyrHorizontalRule extends LeafRenderObjectWidget {
   ZefyrHorizontalRule({@required this.node}) : assert(node != null);
@@ -17,7 +18,7 @@ class ZefyrHorizontalRule extends LeafRenderObjectWidget {
 
   @override
   RenderHorizontalRule createRenderObject(BuildContext context) {
-    return new RenderHorizontalRule(node: node);
+    return new RenderHorizontalRule(node: node, context: context);
   }
 
   @override
@@ -34,7 +35,8 @@ class RenderHorizontalRule extends RenderEditableBox {
 
   RenderHorizontalRule({
     @required EmbedNode node,
-  }) : _node = node;
+    @required BuildContext context,
+  }) : _node = node, _context = context;
 
   @override
   EmbedNode get node => _node;
@@ -45,6 +47,8 @@ class RenderHorizontalRule extends RenderEditableBox {
     markNeedsPaint();
   }
 
+  BuildContext _context;
+
   @override
   double get preferredLineHeight => size.height;
 
@@ -77,7 +81,7 @@ class RenderHorizontalRule extends RenderEditableBox {
   @override
   void paint(PaintingContext context, Offset offset) {
     final rect = new Rect.fromLTWH(0.0, 0.0, size.width, _kThickness);
-    final paint = new ui.Paint()..color = Colors.grey.shade200;
+    final paint = new ui.Paint()..color = ZefyrTheme.of(_context).horizontalRuleColor;
     context.canvas.drawRect(rect.shift(offset), paint);
   }
 

packages/zefyr/lib/src/widgets/quote.dart

@@ -19,7 +19,7 @@ class ZefyrQuote extends StatelessWidget {
     final style = theme.blockTheme.quote.textStyle;
     List<Widget> items = [];
     for (var line in node.children) {
-      items.add(_buildLine(line, style, theme.indentSize));
+      items.add(_buildLine(line, style, theme));
     }
 
     return Padding(
@@ -31,7 +31,7 @@ class ZefyrQuote extends StatelessWidget {
     );
   }
 
-  Widget _buildLine(Node node, TextStyle blockStyle, double indentSize) {
+  Widget _buildLine(Node node, TextStyle blockStyle, ZefyrThemeData theme) {
     LineNode line = node;
 
     Widget content;
@@ -45,10 +45,10 @@ class ZefyrQuote extends StatelessWidget {
     return Container(
       decoration: BoxDecoration(
         border: Border(
-          left: BorderSide(width: 4.0, color: Colors.grey.shade300),
+          left: BorderSide(width: 4.0, color: theme.blockTheme.quote.backgroundColor),
         ),
       ),
-      padding: EdgeInsets.only(left: indentSize),
+      padding: EdgeInsets.only(left: theme.indentSize),
       child: row,
     );
   }

packages/zefyr/lib/src/widgets/theme.dart

@@ -59,6 +59,7 @@ class ZefyrThemeData {
   final StyleTheme paragraphTheme;
   final HeadingTheme headingTheme;
   final BlockTheme blockTheme;
+  final Color horizontalRuleColor;
   final Color selectionColor;
   final Color cursorColor;
 
@@ -88,6 +89,7 @@ class ZefyrThemeData {
           new StyleTheme(textStyle: paragraphStyle, padding: padding),
       headingTheme: new HeadingTheme.fallback(),
       blockTheme: new BlockTheme.fallback(),
+      horizontalRuleColor: Colors.grey.shade200,
       selectionColor: Colors.lightBlueAccent.shade100,
       cursorColor: Colors.black,
       indentSize: 16.0,
@@ -102,6 +104,7 @@ class ZefyrThemeData {
     this.paragraphTheme,
     this.headingTheme,
     this.blockTheme,
+    this.horizontalRuleColor,
     this.selectionColor,
     this.cursorColor,
     this.indentSize,
@@ -116,6 +119,7 @@ class ZefyrThemeData {
     StyleTheme paragraphTheme,
     HeadingTheme headingTheme,
     BlockTheme blockTheme,
+    Color horizontalRuleColor,
     Color selectionColor,
     Color cursorColor,
     double indentSize,
@@ -128,6 +132,7 @@ class ZefyrThemeData {
       paragraphTheme: paragraphTheme ?? this.paragraphTheme,
       headingTheme: headingTheme ?? this.headingTheme,
       blockTheme: blockTheme ?? this.blockTheme,
+      horizontalRuleColor: horizontalRuleColor?? this.horizontalRuleColor,
       selectionColor: selectionColor ?? this.selectionColor,
       cursorColor: cursorColor ?? this.cursorColor,
       indentSize: indentSize ?? this.indentSize,
@@ -143,6 +148,7 @@ class ZefyrThemeData {
       paragraphTheme: other.paragraphTheme,
       headingTheme: other.headingTheme,
       blockTheme: other.blockTheme,
+      horizontalRuleColor: other.horizontalRuleColor,
       selectionColor: other.selectionColor,
       cursorColor: other.cursorColor,
       indentSize: other.indentSize,
@@ -232,6 +238,7 @@ class BlockTheme {
       quote: new StyleTheme(
         textStyle: new TextStyle(color: Colors.grey.shade700),
         padding: padding,
+        backgroundColor: Colors.grey.shade300,
       ),
       code: new StyleTheme(
         textStyle: new TextStyle(
@@ -241,6 +248,7 @@ class BlockTheme {
           height: 1.25,
         ),
         padding: padding,
+        backgroundColor: Colors.blueGrey.shade50,
       ),
     );
   }
@@ -257,10 +265,14 @@ class StyleTheme {
   /// Padding to apply around lines of text.
   final EdgeInsets padding;
 
+  /// Background color of this theme
+  final Color backgroundColor;
+
   /// Creates a new [StyleTheme].
   StyleTheme({
     this.textStyle,
     this.padding,
+    this.backgroundColor,
   });
 }