Merge pull request #99 from Unity-Technologies/add_redux

Add redux

com.unity.uiwidgets/Runtime/redux.meta

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com.unity.uiwidgets/Runtime/redux/redux_logging.cs

+using UnityEngine;
+
+namespace Unity.UIWidgets.Redux {
+    public static class ReduxLogging {
+        public static Middleware<State> create<State>() {
+            return (store) => (next) => new DispatcherImpl((action) => {
+                var previousState = store.getState();
+                var previousStateDump = JsonUtility.ToJson(previousState);
+                var result = next.dispatch(action);
+                var afterState = store.getState();
+                var afterStateDump = JsonUtility.ToJson(afterState);
+                Debug.LogFormat("Action name={0} data={1}", action.ToString(), JsonUtility.ToJson(action));
+                Debug.LogFormat("previousState=\n{0}", previousStateDump);
+                Debug.LogFormat("afterState=\n{0}", afterStateDump);
+                return result;
+            });
+        }
+    }
+}

com.unity.uiwidgets/Runtime/redux/redux_logging.cs.meta

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com.unity.uiwidgets/Runtime/redux/redux_thunk.cs

+using System;
+
+namespace Unity.UIWidgets.Redux {
+    public static class ReduxThunk {
+        public static Middleware<State> create<State>() {
+            return store => next => new DispatcherImpl(action => {
+                var thunkAction = action as ThunkAction<State>;
+                if (thunkAction != null && thunkAction.action != null) {
+                    return thunkAction.action(store.dispatcher, store.getState);
+                }
+                
+                return next.dispatch(action);          
+            });
+        }
+    }
+
+    public sealed class ThunkAction<State> {
+        public readonly Func<Dispatcher, Func<State>, object> action;
+        public readonly string displayName;
+
+        public ThunkAction(
+            Func<Dispatcher, Func<State>, object> action = null,
+            string displayName = null) {
+            this.action = action;
+            this.displayName = displayName ?? "";
+        }
+
+        public override string ToString() {
+            return "ThunkAction(" + displayName + ")";
+        }
+    }
+}

com.unity.uiwidgets/Runtime/redux/redux_thunk.cs.meta

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com.unity.uiwidgets/Runtime/redux/store.cs

+using System;
+using System.Linq;
+
+namespace Unity.UIWidgets {
+    public interface Dispatcher {
+        T dispatch<T>(object action);
+
+        object dispatch(object action);
+    }
+
+    public class DispatcherImpl : Dispatcher {
+        readonly Func<object, object> _impl;
+
+        public DispatcherImpl(Func<object, object> impl) {
+            _impl = impl;
+        }
+        
+        public T dispatch<T>(object action) {
+            if (_impl == null) {
+                return default;
+            }
+
+            return (T) _impl(action);
+        }
+
+        public object dispatch(object action) {
+            if (_impl == null) {
+                return default;
+            }
+
+            return _impl(action);
+        }
+    }
+
+    public delegate State Reducer<State>(State previousState, object action);
+
+    public delegate Func<Dispatcher, Dispatcher> Middleware<State>(Store<State> store);
+
+    public delegate void StateChangedHandler<State>(State action);
+
+    public class Store<State> {
+        public StateChangedHandler<State> stateChanged;
+        
+        readonly Dispatcher _dispatcher;
+        readonly Reducer<State> _reducer;
+        State _state;
+
+        public Store(
+            Reducer<State> reducer,
+            State initialState = default,
+            params Middleware<State>[] middleware) {
+            _reducer = reducer;
+            _dispatcher = _applyMiddleware(middleware);
+            _state = initialState;
+        }
+
+        public Dispatcher dispatcher {
+            get { return _dispatcher; }
+        }
+
+        public State getState() {
+            return _state;
+        }
+
+        Dispatcher _applyMiddleware(params Middleware<State>[] middleware) {
+            return middleware.Reverse().Aggregate<Middleware<State>, Dispatcher>(
+                new DispatcherImpl(_innerDispatch),
+                (current, middlewareItem) => middlewareItem(this)(current));
+        }
+
+        object _innerDispatch(object action) {
+            _state = _reducer(_state, action);
+
+            if (stateChanged != null) {
+                stateChanged(_state);
+            }
+
+            return action;
+        }
+    }
+}

com.unity.uiwidgets/Runtime/redux/store.cs.meta

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com.unity.uiwidgets/Runtime/redux/widget_redux.cs

+using System;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+
+namespace Unity.UIWidgets.Redux {
+    public class StoreProvider<State> : InheritedWidget {
+        readonly Store<State> _store;
+
+        public StoreProvider(
+            Store<State> store = null,
+            Widget child = null,
+            Key key = null) : base(key: key, child: child) {
+            D.assert(store != null);
+            D.assert(child != null);
+            _store = store;
+        }
+
+        public static Store<State> of(BuildContext context) {
+            var type = _typeOf<StoreProvider<State>>();
+            StoreProvider<State> provider = context.inheritFromWidgetOfExactType(type) as StoreProvider<State>;
+            if (provider == null) {
+                throw new UIWidgetsError("StoreProvider is missing");
+            }
+
+            return provider._store;
+        }
+
+        static Type _typeOf<T>() {
+            return typeof(T);
+        }
+
+        public override bool updateShouldNotify(InheritedWidget old) {
+            return !Equals(objA: _store, objB: ((StoreProvider<State>) old)._store);
+        }
+    }
+
+    public delegate Widget ViewModelBuilder<in ViewModel>(BuildContext context, ViewModel viewModel, Dispatcher dispatcher);
+
+    public delegate ViewModel StoreConverter<in State, out ViewModel>(State state);
+
+    public delegate bool ShouldRebuildCallback<in ViewModel>(ViewModel previous, ViewModel current);
+
+    public class StoreConnector<State, ViewModel> : StatelessWidget {
+        public readonly ViewModelBuilder<ViewModel> builder;
+
+        public readonly StoreConverter<State, ViewModel> converter;
+
+        public readonly ShouldRebuildCallback<ViewModel> shouldRebuild;
+
+        public readonly bool pure;
+
+        public StoreConnector(
+            ViewModelBuilder<ViewModel> builder = null,
+            StoreConverter<State, ViewModel> converter = null,
+            bool pure = false, 
+            ShouldRebuildCallback<ViewModel> shouldRebuild = null,
+            Key key = null) : base(key) {
+            D.assert(builder != null);
+            D.assert(converter != null);
+            this.pure = pure;
+            this.builder = builder;
+            this.converter = converter;
+            this.shouldRebuild = shouldRebuild;
+        }
+
+        public override Widget build(BuildContext context) {
+            return new _StoreListener<State, ViewModel>(
+                store: StoreProvider<State>.of(context),
+                builder: builder,
+                converter: converter,
+                pure: pure,
+                shouldRebuild: shouldRebuild
+            );
+        }
+    }
+
+    public class _StoreListener<State, ViewModel> : StatefulWidget {
+        public readonly ViewModelBuilder<ViewModel> builder;
+
+        public readonly StoreConverter<State, ViewModel> converter;
+
+        public readonly Store<State> store;
+
+        public readonly ShouldRebuildCallback<ViewModel> shouldRebuild;
+
+        public readonly bool pure;
+
+        public _StoreListener(
+            ViewModelBuilder<ViewModel> builder = null,
+            StoreConverter<State, ViewModel> converter = null,
+            Store<State> store = null,
+            bool pure = false,
+            ShouldRebuildCallback<ViewModel> shouldRebuild = null,
+            Key key = null) : base(key) {
+            D.assert(builder != null);
+            D.assert(converter != null);
+            D.assert(store != null);
+            this.store = store;
+            this.builder = builder;
+            this.converter = converter;
+            this.pure = pure;
+            this.shouldRebuild = shouldRebuild;
+        }
+
+        public override widgets.State createState() {
+            return new _StoreListenerState<State, ViewModel>();
+        }
+    }
+
+    class _StoreListenerState<State, ViewModel> : State<_StoreListener<State, ViewModel>> {
+        ViewModel latestValue;
+
+        public override void initState() {
+            base.initState();
+            _init();
+        }
+
+        public override void dispose() {
+            widget.store.stateChanged -= _handleStateChanged;
+            base.dispose();
+        }
+
+        public override void didUpdateWidget(StatefulWidget oldWidget) {
+            var oldStore = ((_StoreListener<State, ViewModel>) oldWidget).store;
+            if (widget.store != oldStore) {
+                oldStore.stateChanged -= _handleStateChanged;
+                _init();
+            }
+
+            base.didUpdateWidget(oldWidget);
+        }
+
+        void _init() {
+            widget.store.stateChanged += _handleStateChanged;
+            latestValue = widget.converter(widget.store.getState());
+        }
+
+        void _handleStateChanged(State state) {
+            if (Window.instance._panel != null) {
+                _innerStateChanged(state: state);
+            }
+            else {
+                var isolate = Isolate.current;
+                using (Isolate.getScope(isolate: isolate)) {
+                    _innerStateChanged(state: state);
+                }
+            }
+        }
+
+        void _innerStateChanged(State state) {
+            var preValue = latestValue;
+            latestValue = widget.converter(widget.store.getState());
+            if (widget.shouldRebuild != null) {
+                if (!widget.shouldRebuild(preValue, latestValue)) {
+                    return;
+                }
+            }
+            else if (widget.pure) {
+                if (Equals(preValue, latestValue)) {
+                    return;
+                }
+            }
+
+            setState();
+        }
+
+        public override Widget build(BuildContext context) {
+            return widget.builder(context, latestValue, widget.store.dispatcher);
+        }
+    }
+}

com.unity.uiwidgets/Runtime/redux/widget_redux.cs.meta

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