ParseLiveList Performance improvement (#327)

* Created ParseLiveList

* LiveList & LivListBuilder works

* Cleanup

* changed to animated list

* Fix in dataloading

* updated AnimatedList

* Finished Animations & cleanup

* handle reconnect

* Added dispose methodes & renamed classes & cleanup

* cleanup

* Fix animation duration

* added README ParseLiveList section

* Initialized example_livelist

* Update application_constants.dart

* Update .gitignore

* Revert "Update .gitignore"

This reverts commit 4d8982d.

* Update .gitignore

* HotFix: object Update from client

If the client changes the object.
(ParseObject does not get copied)

* Implemented simple example

* Update README.md

* Update main.dart

* Update README.md

* Update README.md

* LiveList - Performance Improvement

This is the change mentioned in #324 (comment)

Requires #326

* LiveList - Performance Improvement

This is the change mentioned in #324 (comment)

Requires #326

* example_livelist: use clientKey

* Changed example_livelist query

In the README I wrote, you can use a field called "show" to hide elements.

Author: fischerscode

example_livelist/lib/application_constants.dart

@@ -1,6 +1,6 @@
 const String keyApplicationName = '';
 const String keyParseApplicationId = '';
-const String keyParseMasterKey = '';
+const String keyParseClientKey = '';
 const String keyParseServerUrl = '';
 const String keyParseLiveServerUrl = '';
 const bool keyDebug = true;

example_livelist/lib/main.dart

@@ -23,8 +23,8 @@ class _MyAppState extends State<MyApp> {
         initFailed = !success;
         if (success)
           _queryBuilder = QueryBuilder<ParseObject>(ParseObject('Test'))
-            ..orderByAscending('order');
-        ;
+            ..orderByAscending('order')
+            ..whereNotEqualTo('show', false);
       });
     }).catchError((dynamic _) {
       setState(() {
@@ -179,6 +179,7 @@ class _ObjectFormState extends State<ObjectForm> {
                     setState(() {
                       _formKey.currentState.save();
                       final ParseObject object = _currentObject;
+                      //Delay to highlight the animation.
                       Future<void>.delayed(const Duration(seconds: 1))
                           .then((_) {
                         object.save();

lib/src/utils/parse_live_list.dart

@@ -160,27 +160,28 @@ class ParseLiveList<T extends ParseObject> {
     for (int i = 0; i < _list.length; i++) {
       if (after(object, _list[i].object) != true) {
         _list.insert(i, ParseLiveListElement<T>(object, loaded: loaded));
-        _eventStreamController.sink.add(ParseLiveListAddEvent<T>(i, object));
+        _eventStreamController.sink.add(ParseLiveListAddEvent<T>(
+            i, object?.clone(object?.toJson(full: true))));
         return;
       }
     }
     _list.add(ParseLiveListElement<T>(object, loaded: loaded));
-    _eventStreamController.sink
-        .add(ParseLiveListAddEvent<T>(_list.length - 1, object));
+    _eventStreamController.sink.add(ParseLiveListAddEvent<T>(
+        _list.length - 1, object?.clone(object?.toJson(full: true))));
   }
 
   void _objectUpdated(T object) {
     for (int i = 0; i < _list.length; i++) {
       if (_list[i].object.get<String>(keyVarObjectId) ==
           object.get<String>(keyVarObjectId)) {
-        //TODO: better soulution
-//        if (after(_list[i].object, object) == null) {
-//          _list[i].object = object;
-//        } else {
-        _list.removeAt(i).dispose();
-        _eventStreamController.sink.add(ParseLiveListDeleteEvent<T>(i, object));
-        _objectAdded(object);
-//        }
+        if (after(_list[i].object, object) == null) {
+          _list[i].object = object;
+        } else {
+          _list.removeAt(i).dispose();
+          _eventStreamController.sink.add(ParseLiveListDeleteEvent<T>(
+              i, object?.clone(object?.toJson(full: true))));
+          _objectAdded(object);
+        }
         break;
       }
     }
@@ -191,7 +192,8 @@ class ParseLiveList<T extends ParseObject> {
       if (_list[i].object.get<String>(keyVarObjectId) ==
           object.get<String>(keyVarObjectId)) {
         _list.removeAt(i).dispose();
-        _eventStreamController.sink.add(ParseLiveListDeleteEvent<T>(i, object));
+        _eventStreamController.sink.add(ParseLiveListDeleteEvent<T>(
+            i, object?.clone(object?.toJson(full: true))));
         break;
       }
     }
@@ -256,12 +258,12 @@ class ParseLiveListElement<T extends ParseObject> {
 
   Stream<T> get stream => _streamController?.stream;
 
-  T get object => _object;
+  T get object => _object?.clone(_object?.toJson(full: true));
 
   set object(T value) {
     _loaded = true;
     _object = value;
-    _streamController?.add(object);
+    _streamController?.add(_object?.clone(_object?.toJson(full: true)));
   }
 
   bool get loaded => _loaded;