fix example

packages/zefyr/example/lib/src/full_page.dart

           // ),
           Expanded(
             child: ZefyrScaffold(
-              child: ZefyrTheme(
-                data: ZefyrThemeData(),
-                child: ZefyrEditor(
+              child: ZefyrEditor(
                   autofocus: false,
                   controller: _controller,
                   focusNode: _focusNode,
                     print(_controller.document.toJson());
                   },
                 ),
-              ),
             ),
           ),
         ],
     return GestureDetector(
       behavior: HitTestBehavior.translucent,
       onTap: () {
-        FocusScope.of(context).unfocus();
+        primaryFocus.unfocus();
       },
       child: Theme(
         data: ThemeData(primarySwatch: Colors.cyan),

packages/zefyr/example/lib/src/images.dart

 
 /// Custom image delegate used by this example to load image from application
 /// assets.
-class CustomImageDelegate implements ZefyrImageDelegate<ImageSource> {
-  @override
-  ImageSource get cameraSource => ImageSource.camera;
-
-  @override
-  ImageSource get gallerySource => ImageSource.gallery;
-
+class CustomImageDelegate implements ZefyrImageDelegate {
+  
   @override
   Future<String> pickImage(ImageSource source) async {
     final file = await ImagePicker.pickImage(source: source);