Allow for custom context menu (#1320)

* Persist boolean logic for showSelectionToolbar

* Add test for custom context menu

* Adjust test to reflect custom context menu implementation

---------

Co-authored-by: operatorultra <105389680+operatorultra@users.noreply.github.com>

lib/src/widgets/editor.dart

@@ -191,6 +191,7 @@ class QuillEditor extends StatefulWidget {
     this.customLinkPrefixes = const <String>[],
     this.dialogTheme,
     this.contentInsertionConfiguration,
+    this.contextMenuBuilder,
     Key? key,
   }) : super(key: key);
 
@@ -432,6 +433,9 @@ class QuillEditor extends StatefulWidget {
   /// Configures the dialog theme.
   final QuillDialogTheme? dialogTheme;
 
+  // Allows for creating a custom context menu
+  final QuillEditorContextMenuBuilder? contextMenuBuilder;
+
   /// Configuration of handler for media content inserted via the system input
   /// method.
   ///
@@ -503,8 +507,9 @@ class QuillEditorState extends State<QuillEditor>
       readOnly: widget.readOnly,
       placeholder: widget.placeholder,
       onLaunchUrl: widget.onLaunchUrl,
-      contextMenuBuilder:
-          showSelectionToolbar ? RawEditor.defaultContextMenuBuilder : null,
+      contextMenuBuilder: showSelectionToolbar
+          ? (widget.contextMenuBuilder ?? RawEditor.defaultContextMenuBuilder)
+          : null,
       showSelectionHandles: isMobile(theme.platform),
       showCursor: widget.showCursor,
       cursorStyle: CursorStyle(

test/widgets/editor_test.dart

@@ -4,10 +4,12 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_quill/flutter_quill.dart';
 import 'package:flutter_quill/flutter_quill_test.dart';
+import 'package:flutter_quill/src/widgets/raw_editor.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
   late QuillController controller;
+  var didCopy = false;
 
   setUp(() {
     controller = QuillController.basic();
@@ -78,5 +80,54 @@ void main() {
       expect(error, isNull);
       expect(latestUri, equals(uri));
     });
+
+    Widget customBuilder(BuildContext context, RawEditorState state) {
+      return AdaptiveTextSelectionToolbar(
+        anchors: state.contextMenuAnchors,
+        children: [
+          Container(
+            height: 50,
+            color: Colors.white,
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.spaceAround,
+              children: [
+                IconButton(
+                  onPressed: () {
+                    didCopy = true;
+                  },
+                  icon: const Icon(Icons.copy),
+                ),
+              ],
+            ),
+          ),
+        ],
+      );
+    }
+
+    testWidgets('custom context menu builder', (tester) async {
+      await tester.pumpWidget(MaterialApp(
+        home: QuillEditor(
+          controller: controller,
+          focusNode: FocusNode(),
+          scrollController: ScrollController(),
+          scrollable: true,
+          padding: EdgeInsets.zero,
+          autoFocus: true,
+          readOnly: false,
+          expands: true,
+          contextMenuBuilder: customBuilder,
+        ),
+      ));
+
+      // Long press to show menu
+      await tester.longPress(find.byType(QuillEditor));
+      await tester.pumpAndSettle();
+
+      // Verify custom widget shows
+      expect(find.byIcon(Icons.copy), findsOneWidget);
+
+      await tester.tap(find.byIcon(Icons.copy));
+      expect(didCopy, isTrue);
+    });
   });
 }