Add EmbedBuilder

lib/widgets/delegate.dart

@@ -1,7 +1,10 @@
 import 'package:flutter/cupertino.dart';
+import 'package:flutter_quill/models/documents/nodes/leaf.dart';
 
 import 'editor.dart';
 
+typedef EmbedBuilder = Widget Function(BuildContext context, Embed node);
+
 abstract class EditorTextSelectionGestureDetectorBuilderDelegate {
   GlobalKey<EditorState> getEditableTextKey();
 

lib/widgets/editor.dart

@@ -54,6 +54,7 @@ class QuillEditor extends StatefulWidget {
   final Brightness keyboardAppearance;
   final ScrollPhysics scrollPhysics;
   final ValueChanged<String> onLaunchUrl;
+  final EmbedBuilder embedBuilder;
 
   QuillEditor(
       this.controller,
@@ -71,12 +72,14 @@ class QuillEditor extends StatefulWidget {
       this.textCapitalization,
       this.keyboardAppearance,
       this.scrollPhysics,
-      this.onLaunchUrl)
+      this.onLaunchUrl,
+      this.embedBuilder)
       : assert(controller != null),
         assert(scrollController != null),
         assert(scrollable != null),
         assert(autoFocus != null),
-        assert(readOnly != null);
+        assert(readOnly != null),
+        assert(embedBuilder != null);
 
   @override
   _QuillEditorState createState() => _QuillEditorState();
@@ -175,7 +178,8 @@ class _QuillEditorState extends State<QuillEditor>
           textSelectionControls,
           widget.keyboardAppearance,
           widget.enableInteractiveSelection,
-          widget.scrollPhysics),
+          widget.scrollPhysics,
+          widget.embedBuilder),
     );
   }
 
@@ -229,6 +233,7 @@ class RawEditor extends StatefulWidget {
   final Brightness keyboardAppearance;
   final bool enableInteractiveSelection;
   final ScrollPhysics scrollPhysics;
+  final EmbedBuilder embedBuilder;
 
   RawEditor(
       Key key,
@@ -252,7 +257,8 @@ class RawEditor extends StatefulWidget {
       this.selectionCtrls,
       this.keyboardAppearance,
       this.enableInteractiveSelection,
-      this.scrollPhysics)
+      this.scrollPhysics,
+      this.embedBuilder)
       : assert(controller != null),
         assert(focusNode != null),
         assert(scrollable || scrollController != null),
@@ -267,6 +273,7 @@ class RawEditor extends StatefulWidget {
         assert(autoFocus != null),
         assert(toolbarOptions != null),
         showCursor = showCursor ?? !readOnly,
+        assert(embedBuilder != null),
         super(key: key);
 
   @override

lib/widgets/text_block.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_quill/models/documents/nodes/block.dart';
 import 'package:tuple/tuple.dart';
 
-import 'box.dart';
+import 'delegate.dart';
 
 class EditableTextBlock extends StatelessWidget {
   final Block block;
@@ -13,6 +13,7 @@ class EditableTextBlock extends StatelessWidget {
   final bool enableInteractiveSelection;
   final bool hasFocus;
   final EdgeInsets contentPadding;
+  final EmbedBuilder embedBuilder;
 
   EditableTextBlock(
       this.block,
@@ -22,7 +23,10 @@ class EditableTextBlock extends StatelessWidget {
       this.color,
       this.enableInteractiveSelection,
       this.hasFocus,
-      this.contentPadding);
+      this.contentPadding,
+      this.embedBuilder)
+      : assert(hasFocus != null),
+        assert(embedBuilder != null);
 
   @override
   Widget build(BuildContext context) {

lib/widgets/text_line.dart

@@ -4,6 +4,7 @@ import 'package:flutter_quill/models/documents/attribute.dart';
 import 'package:flutter_quill/models/documents/nodes/container.dart'
     as container;
 import 'package:flutter_quill/models/documents/nodes/leaf.dart' as leaf;
+import 'package:flutter_quill/models/documents/nodes/leaf.dart';
 import 'package:flutter_quill/models/documents/nodes/line.dart';
 import 'package:flutter_quill/models/documents/nodes/node.dart';
 import 'package:flutter_quill/models/documents/style.dart';
@@ -13,20 +14,26 @@ import 'package:tuple/tuple.dart';
 
 import 'box.dart';
 import 'default_styles.dart';
+import 'delegate.dart';
 
 class TextLine extends StatelessWidget {
   final Line line;
   final TextDirection textDirection;
+  final EmbedBuilder embedBuilder;
 
-  const TextLine({Key key, this.line, this.textDirection})
+  const TextLine({Key key, this.line, this.textDirection, this.embedBuilder})
       : assert(line != null),
+        assert(embedBuilder != null),
         super(key: key);
 
   @override
   Widget build(BuildContext context) {
     assert(debugCheckHasMediaQuery(context));
 
-    // TODO: line.hasEmbed
+    if (line.hasEmbed) {
+      Embed embed = line.children.single as Embed;
+      return EmbedProxy(embedBuilder(context, embed));
+    }
 
     TextSpan textSpan = _buildTextSpan(context);
     StrutStyle strutStyle =