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'''
ComboBox
=======
Based on Spinner
'''
__all__ = ('ComboBox', 'ComboBoxOption')
from kivy.properties import ListProperty, ObjectProperty, BooleanProperty
from kivy.uix.button import Button
from kivy.uix.dropdown import DropDown
from kivy.lang import Builder
Builder.load_string('''
<ComboBoxOption>:
size_hint_y: None
height: 44
<ComboBox>:
background_normal: 'atlas://data/images/defaulttheme/spinner'
background_down: 'atlas://data/images/defaulttheme/spinner_pressed'
on_key:
if self.items: x, y = zip(*self.items); self.text = y[x.index(args[1])]
''')
class ComboBoxOption(Button):
pass
class ComboBox(Button):
items = ListProperty()
key = ObjectProperty()
option_cls = ObjectProperty(ComboBoxOption)
dropdown_cls = ObjectProperty(DropDown)
is_open = BooleanProperty(False)
def __init__(self, **kwargs):
self._dropdown = None
super(ComboBox, self).__init__(**kwargs)
self.items_dict = dict(self.items)
self.bind(
on_release=self._toggle_dropdown,
dropdown_cls=self._build_dropdown,
option_cls=self._build_dropdown,
items=self._update_dropdown,
key=self._update_text)
self._build_dropdown()
self._update_text()
def _update_text(self, *largs):
try:
self.text = self.items_dict[self.key]
except KeyError:
pass
def _build_dropdown(self, *largs):
if self._dropdown:
self._dropdown.unbind(on_select=self._on_dropdown_select)
self._dropdown.dismiss()
self._dropdown = None
self._dropdown = self.dropdown_cls()
self._dropdown.bind(on_select=self._on_dropdown_select)
self._update_dropdown()
def _update_dropdown(self, *largs):
dp = self._dropdown
cls = self.option_cls
dp.clear_widgets()
for key, value in self.items:
item = cls(text=value)
# extra attribute
item.key = key
item.bind(on_release=lambda option: dp.select(option.key))
dp.add_widget(item)
def _toggle_dropdown(self, *largs):
self.is_open = not self.is_open
def _on_dropdown_select(self, instance, data, *largs):
self.key = data
self.is_open = False
def on_is_open(self, instance, value):
if value:
self._dropdown.open(self)
else:
self._dropdown.dismiss()