Kivy StringListView box v2

gistfile1.py

import kivy
kivy.require('1.0.9')
from kivy.lang import Builder
from kivy.clock import Clock
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty, NumericProperty, ListProperty, ObjectProperty


Builder.load_string('''
[StringListViewItem@BoxLayout]:
    orientation: 'horizontal'
    Label:
        text: ctx.text
        on_touch_down: self.parent.parent.set_chosen(self)
''')

class StringListView(BoxLayout):

    item_template = StringProperty('StringListViewItem')

    items = ListProperty([])

    chosen = ObjectProperty(None)

    def on_items(self, *args):
        self.orientation = 'vertical'
        self.clear_widgets()
        for item in self.items:
            Clock.schedule_once(self._new_item_func(item), 0)

    def _new_item_func(self, item):
        itemd = item.copy()
        def _(x):
            w = Builder.template(self.item_template, **itemd)
            self.add_widget(w)
        return _

    def _new_item(self, item):
        w = Builder.template(self.item_template, **item)
        print item
        self.add_widget(w)

    def set_chosen(self, widget):
        self.chosen = widget
        print "chose %s" % widget.text



if __name__ == '__main__':
    from kivy.app import App
    # App to test these widgets

    class TestApp(App):
        def build(self):
            items = [ {'text':'item %d' % i} for i in range(20) ]
            return StringListView(items=items)

    TestApp().run()