Add inline code formatting

lib/src/models/documents/attribute.dart

@@ -22,6 +22,7 @@ class Attribute<T> {
     Attribute.small.key: Attribute.small,
     Attribute.underline.key: Attribute.underline,
     Attribute.strikeThrough.key: Attribute.strikeThrough,
+    Attribute.inlineCode.key: Attribute.inlineCode,
     Attribute.font.key: Attribute.font,
     Attribute.size.key: Attribute.size,
     Attribute.link.key: Attribute.link,
@@ -50,6 +51,8 @@ class Attribute<T> {
 
   static final StrikeThroughAttribute strikeThrough = StrikeThroughAttribute();
 
+  static final InlineCodeAttribute inlineCode = InlineCodeAttribute();
+
   static final FontAttribute font = FontAttribute(null);
 
   static final SizeAttribute size = SizeAttribute(null);
@@ -240,6 +243,10 @@ class StrikeThroughAttribute extends Attribute<bool> {
   StrikeThroughAttribute() : super('strike', AttributeScope.INLINE, true);
 }
 
+class InlineCodeAttribute extends Attribute<bool> {
+  InlineCodeAttribute() : super('code', AttributeScope.INLINE, true);
+}
+
 class FontAttribute extends Attribute<String?> {
   FontAttribute(String? val) : super('font', AttributeScope.INLINE, val);
 }

lib/src/widgets/default_styles.dart

@@ -54,6 +54,7 @@ class DefaultStyles {
     this.small,
     this.underline,
     this.strikeThrough,
+    this.inlineCode,
     this.link,
     this.color,
     this.placeHolder,
@@ -77,6 +78,7 @@ class DefaultStyles {
   final TextStyle? small;
   final TextStyle? underline;
   final TextStyle? strikeThrough;
+  final TextStyle? inlineCode;
   final TextStyle? sizeSmall; // 'small'
   final TextStyle? sizeLarge; // 'large'
   final TextStyle? sizeHuge; // 'huge'
@@ -152,6 +154,11 @@ class DefaultStyles {
         small: const TextStyle(fontSize: 12, color: Colors.black45),
         underline: const TextStyle(decoration: TextDecoration.underline),
         strikeThrough: const TextStyle(decoration: TextDecoration.lineThrough),
+        inlineCode: TextStyle(
+          color: Colors.blue.shade900.withOpacity(0.9),
+          fontFamily: fontFamily,
+          fontSize: 13,
+        ),
         link: TextStyle(
           color: themeData.colorScheme.secondary,
           decoration: TextDecoration.underline,
@@ -211,6 +218,7 @@ class DefaultStyles {
         small: other.small ?? small,
         underline: other.underline ?? underline,
         strikeThrough: other.strikeThrough ?? strikeThrough,
+        inlineCode: other.inlineCode ?? inlineCode,
         link: other.link ?? link,
         color: other.color ?? color,
         placeHolder: other.placeHolder ?? placeHolder,

lib/src/widgets/text_line.dart

@@ -192,6 +192,7 @@ class TextLine extends StatelessWidget {
       Attribute.link.key: defaultStyles.link,
       Attribute.underline.key: defaultStyles.underline,
       Attribute.strikeThrough.key: defaultStyles.strikeThrough,
+      Attribute.inlineCode.key: defaultStyles.inlineCode,
     }.forEach((k, s) {
       if (style.values.any((v) => v.key == k)) {
         if (k == Attribute.underline.key || k == Attribute.strikeThrough.key) {

lib/src/widgets/toolbar.dart

@@ -70,6 +70,7 @@ class QuillToolbar extends StatelessWidget implements PreferredSizeWidget {
     bool showSmallButton = false,
     bool showUnderLineButton = true,
     bool showStrikeThrough = true,
+    bool showInlineCode = true,
     bool showColorButton = true,
     bool showBackgroundColorButton = true,
     bool showClearFormat = true,
@@ -103,6 +104,7 @@ class QuillToolbar extends StatelessWidget implements PreferredSizeWidget {
           showSmallButton ||
           showUnderLineButton ||
           showStrikeThrough ||
+          showInlineCode ||
           showColorButton ||
           showBackgroundColorButton ||
           showClearFormat ||
@@ -169,6 +171,13 @@ class QuillToolbar extends StatelessWidget implements PreferredSizeWidget {
             iconSize: toolbarIconSize,
             controller: controller,
           ),
+        if (showInlineCode)
+          ToggleStyleButton(
+            attribute: Attribute.inlineCode,
+            icon: Icons.code,
+            iconSize: toolbarIconSize,
+            controller: controller,
+          ),
         if (showColorButton)
           ColorButton(
             icon: Icons.color_lens,