Add onImagePaste in example (#951)

* Add onImagePaste in example

* Update _onImagePaste

* Update _onImagePaste

example/lib/pages/home_page.dart

@@ -110,6 +110,7 @@ class _HomePageState extends State<HomePage> {
       placeholder: 'Add content',
       expands: false,
       padding: EdgeInsets.zero,
+      onImagePaste: _onImagePaste,
       customStyles: DefaultStyles(
         h1: DefaultTextBlockStyle(
             const TextStyle(
@@ -351,6 +352,15 @@ class _HomePageState extends State<HomePage> {
     );
   }
 
+  Future<String> _onImagePaste(Uint8List imageBytes) async {
+    // Saves the image to applications directory
+    final appDocDir = await getApplicationDocumentsDirectory();
+    final file = await File(
+            '${appDocDir.path}/${basename('${DateTime.now().millisecondsSinceEpoch}.png')}')
+        .writeAsBytes(imageBytes, flush: true);
+    return file.path.toString();
+  }
+
   Future<void> _addEditNote(BuildContext context, {Document? document}) async {
     final isEditing = document != null;
     final quillEditorController = QuillController(