static TodoAppState SetVisibility(TodoAppState state, SetVisibility act)
{
return(new TodoAppState
{
Todos = state.Todos,
Visibility = act.Visibility,
DescriptionInput = state.DescriptionInput
});
}
static TodoAppState UpdateDescriptionInput(TodoAppState state, UpdateDescriptionInput act)
{
return(new TodoAppState
{
Todos = state.Todos,
Visibility = state.Visibility,
DescriptionInput = act.Description
});
}
public static ReduxReducer <TodoAppState> Reducer(TodoAppState initialState) => BuildReducer.For <TodoAppState>() .WhenActionHasType <AddTodo>(AddTodo) .WhenActionHasType <DeleteTodo>(DeleteTodo) .WhenActionHasType <UpdateTodo>(UpdateTodo) .WhenActionHasType <ToggleTodoCompleted>(ToggleTodoCompleted) .WhenActionHasType <SetVisibility>(SetVisibility) .WhenActionHasType <UpdateDescriptionInput>(UpdateDescriptionInput) .WhenStateIsUndefinedOrNull(() => initialState) .WhenActionIsUnknown(state => state) .Build();
static TodoAppState ToggleTodoCompleted(TodoAppState state, ToggleTodoCompleted act) => new TodoAppState
{
Todos = state.Todos.Select(todo =>
{
if (todo.Id == act.Id)
{
return(new Todo
{
Id = todo.Id,
Description = todo.Description,
IsCompleted = !todo.IsCompleted
});
}
else
{
return(todo);
}
}).ToArray(),
Visibility = state.Visibility,
DescriptionInput = state.DescriptionInput
};
private static TodoAppState AddTodo(TodoAppState state, AddTodo act)
{
int nextId = 0;
if (state.Todos.Any())
{
var maxId = state.Todos.Max(_todo => _todo.Id);
nextId = maxId + 1;
}
var todo = new Todo
{
Id = nextId,
Description = state.DescriptionInput,
IsCompleted = false
};
return(new TodoAppState
{
Todos = state.Todos.Concat <Todo>(new Todo[] { todo }).ToArray(),
Visibility = state.Visibility,
DescriptionInput = state.DescriptionInput
});
}
static TodoAppState DeleteTodo(TodoAppState state, DeleteTodo act) => new TodoAppState
{
Todos = state.Todos.Where(todo => todo.Id != act.Id).ToArray(),
Visibility = state.Visibility,
DescriptionInput = state.DescriptionInput
};
public static void Main()
{
var initialState = new TodoAppState
{
DescriptionInput = "",
Visibility = TodoVisibility.All,
Todos = new Todo[]
{
new Todo
{
Id = 0,
Description = "Have fun with Ractive and Redux",
IsCompleted = true
},
new Todo
{
Id = 1,
Description = "Make an awesome todo app",
IsCompleted = false
}
}
};
var store = Redux.CreateStore(Todos.Reducer(initialState));
Action <TodoVisibility> show = filter => store.Dispatch(new SetVisibility {
Visibility = filter
});
// events that are attached to button clicks on the template
var eventHandlers = new EventHandlers
{
ToggleTodo = id => store.Dispatch(new ToggleTodoCompleted {
Id = id
}),
DeleteTodo = id => store.Dispatch(new DeleteTodo {
Id = id
}),
AddTodo = () => store.Dispatch(new AddTodo {
}),
ShowAll = () => show(TodoVisibility.All),
ShowComplete = () => show(TodoVisibility.Completed),
ShowIncomplete = () => show(TodoVisibility.YetToComplete)
};
// functions that can be called in the template to compute smth directly
var functions = new TemplateFunctions
{
Filter = (visibility, todos) =>
{
if (visibility == TodoVisibility.Completed)
{
return(todos.Where(todo => todo.IsCompleted).ToArray());
}
if (visibility == TodoVisibility.YetToComplete)
{
return(todos.Where(todo => !todo.IsCompleted).ToArray());
}
return(todos);
}
};
var ractive = new Ractive(new RactiveOptions
{
Element = "#app",
Template = "#app-template",
Data = JS.Merge(initialState, functions)
});
// although two-way binding is available in Ractive,
// I will use a vanilla handler to make data-flow one directional
ractive.Find("#txtAddTodo").OnTextChanged(input =>
{
store.Dispatch(new UpdateDescriptionInput {
Description = input
});
});
// attach the events
ractive.On(eventHandlers);
store.Subscribe(() =>
{
var state = store.GetState();
ractive.Set(JS.Merge(state, functions));
});
}