private UIElement CreateBody(Todos todos)
{
// Disconnect the ScrollViewer from it's previous ContentControl parent
if (bodyContainer != null)
{
bodyContainer.Content = null;
}
bodyScroller.Content =
new StackPanel()
{
Orientation = Orientation.Vertical
}
.Containing(todos.TodoItems.Select(CreateTodoItem));
return(bodyContainer = new ContentControl()
{
Content = bodyScroller
});
}
private UIElement CreateHeader(Todos todos)
{
return(new Grid()
{
}
.DoWith(g =>
{
g.ColumnDefinitions.Add(new ColumnDefinition()
{
Width = GridLength.Auto
});
g.ColumnDefinitions.Add(new ColumnDefinition());
})
.Containing(
new TextBlock()
{
Text = "Add a todo",
HorizontalAlignment = HorizontalAlignment.Stretch
}
.DoWith(t => t.SetValue(Grid.ColumnProperty, 0)),
new TextBox()
{
}.DoWith(t =>
{
t.Loaded += (sender, args) => t.Focus();
t.KeyDown += (sender, args) =>
{
if (args.Key == Key.Enter)
{
args.Handled = true;
Dispatch(TodoMessage.Add(new TodoItem(t.Text, false)));
}
};
})
.DoWith(t => t.SetValue(Grid.ColumnProperty, 1))
));
}
public MainWindow()
{
InitializeComponent();
component = Component.Create <Todos, TodoMessage, UIElement>(
new Todos(ImmutableList <TodoItem> .Empty, false),
(msg, todos) => msg.Map(
toggleFilter: filter => new Todos(todos.TodoItems, filter),
add: todo => new Todos(todos.TodoItems.Add(todo), todos.Filter),
remove: todo => new Todos(todos.TodoItems.Remove(todo), todos.Filter),
toggleCompleted: todo => new Todos(
todos.TodoItems.Replace(todo, new TodoItem(todo.Text, !todo.Completed)),
todos.Filter)),
(todos) =>
new Grid()
{
Margin = new Thickness(5, 5, 5, 5)
}
.WithRow(Height: GridLength.Auto)
.WithRow()
.WithRow(Height: GridLength.Auto)
.Containing(
CreateHeader(todos).DoWith(t => t.SetValue(Grid.RowProperty, 0)),
CreateBody(todos).DoWith(s => s.SetValue(Grid.RowProperty, 1)),
new TextBlock()
{
Text = "Show Completed"
}.DoWith(t => t.SetValue(Grid.RowProperty, 2)))
);
this.model = component.InitialModel;
this.Content = component.View(model);
}
private void Dispatch(TodoMessage msg)
{
model = component.Update(msg, model);
this.Content = component.View(model);
}