'''
Spinner
=======
.. versionadded:: 1.4.0
.. image:: images/spinner.jpg
:align: right
Spinner is a widget that provides a quick way to select one value from a set.
In the default state, a spinner shows its currently selected value.
Touching the spinner displays a dropdown menu with all the other available
values from which the user can select a new one.
Example::
from kivy.base import runTouchApp
from kivy.uix.spinner import Spinner
spinner = Spinner(
# default value shown
text='Home',
# available values
values=('Home', 'Work', 'Other', 'Custom'),
# just for positioning in our example
size_hint=(None, None),
size=(100, 44),
pos_hint={'center_x': .5, 'center_y': .5})
def show_selected_value(spinner, text):
print('The spinner', spinner, 'has text', text)
spinner.bind(text=show_selected_value)
runTouchApp(spinner)
Kv Example::
FloatLayout:
Spinner:
size_hint: None, None
size: 100, 44
pos_hint: {'center': (.5, .5)}
text: 'Home'
values: 'Home', 'Work', 'Other', 'Custom'
on_text:
print("The spinner {} has text {}".format(self, self.text))
'''
__all__ = ('Spinner', 'SpinnerOption')
from kivy.compat import string_types
from kivy.factory import Factory
from kivy.properties import ListProperty, ObjectProperty, BooleanProperty
from kivy.uix.button import Button
from kivy.uix.dropdown import DropDown
[docs]class SpinnerOption(Button):
'''Special button used in the :class:`Spinner` dropdown list. By default,
this is just a :class:`~kivy.uix.button.Button` with a size_hint_y of None
and a height of :meth:`48dp <kivy.metrics.dp>`.
'''
pass
[docs]class Spinner(Button):
'''Spinner class, see module documentation for more information.
'''
values = ListProperty()
'''Values that can be selected by the user. It must be a list of strings.
:attr:`values` is a :class:`~kivy.properties.ListProperty` and defaults to
[].
'''
text_autoupdate = BooleanProperty(False)
'''Indicates if the spinner's :attr:`text` should be automatically
updated with the first value of the :attr:`values` property.
Setting it to True will cause the spinner to update its :attr:`text`
property every time attr:`values` are changed.
.. versionadded:: 1.10.0
:attr:`text_autoupdate` is a :class:`~kivy.properties.BooleanProperty` and
defaults to False.
'''
option_cls = ObjectProperty(SpinnerOption)
'''Class used to display the options within the dropdown list displayed
under the Spinner. The `text` property of the class will be used to
represent the value.
The option class requires:
- a `text` property, used to display the value.
- an `on_release` event, used to trigger the option when pressed/touched.
- a :attr:`~kivy.uix.widget.Widget.size_hint_y` of None.
- the :attr:`~kivy.uix.widget.Widget.height` to be set.
:attr:`option_cls` is an :class:`~kivy.properties.ObjectProperty` and
defaults to :class:`SpinnerOption`.
.. versionchanged:: 1.8.0
If you set a string, the :class:`~kivy.factory.Factory` will be used to
resolve the class.
'''
dropdown_cls = ObjectProperty(DropDown)
'''Class used to display the dropdown list when the Spinner is pressed.
:attr:`dropdown_cls` is an :class:`~kivy.properties.ObjectProperty` and
defaults to :class:`~kivy.uix.dropdown.DropDown`.
.. versionchanged:: 1.8.0
If set to a string, the :class:`~kivy.factory.Factory` will be used to
resolve the class name.
'''
is_open = BooleanProperty(False)
'''By default, the spinner is not open. Set to True to open it.
:attr:`is_open` is a :class:`~kivy.properties.BooleanProperty` and
defaults to False.
.. versionadded:: 1.4.0
'''
sync_height = BooleanProperty(False)
'''Each element in a dropdown list uses a default/user-supplied height.
Set to True to propagate the Spinner's height value to each dropdown
list element.
.. versionadded:: 1.10.0
:attr:`sync_height` is a :class:`~kivy.properties.BooleanProperty` and
defaults to False.
'''
def __init__(self, **kwargs):
self._dropdown = None
super(Spinner, self).__init__(**kwargs)
fbind = self.fbind
build_dropdown = self._build_dropdown
fbind('on_release', self._toggle_dropdown)
fbind('dropdown_cls', build_dropdown)
fbind('option_cls', build_dropdown)
fbind('values', self._update_dropdown)
fbind('size', self._update_dropdown_size)
fbind('text_autoupdate', self._update_dropdown)
build_dropdown()
def _build_dropdown(self, *largs):
if self._dropdown:
self._dropdown.unbind(on_select=self._on_dropdown_select)
self._dropdown.unbind(on_dismiss=self._close_dropdown)
self._dropdown.dismiss()
self._dropdown = None
cls = self.dropdown_cls
if isinstance(cls, string_types):
cls = Factory.get(cls)
self._dropdown = cls()
self._dropdown.bind(on_select=self._on_dropdown_select)
self._dropdown.bind(on_dismiss=self._close_dropdown)
self._update_dropdown()
def _update_dropdown_size(self, *largs):
if not self.sync_height:
return
dp = self._dropdown
if not dp:
return
container = dp.container
if not container:
return
h = self.height
for item in container.children[:]:
item.height = h
def _update_dropdown(self, *largs):
dp = self._dropdown
cls = self.option_cls
values = self.values
text_autoupdate = self.text_autoupdate
if isinstance(cls, string_types):
cls = Factory.get(cls)
dp.clear_widgets()
for value in values:
item = cls(text=value)
item.height = self.height if self.sync_height else item.height
item.bind(on_release=lambda option: dp.select(option.text))
dp.add_widget(item)
if text_autoupdate:
if values:
if not self.text or self.text not in values:
self.text = values[0]
else:
self.text = ''
def _toggle_dropdown(self, *largs):
if self.values:
self.is_open = not self.is_open
def _close_dropdown(self, *largs):
self.is_open = False
def _on_dropdown_select(self, instance, data, *largs):
self.text = data
self.is_open = False
def on_is_open(self, instance, value):
if value:
self._dropdown.open(self)
else:
if self._dropdown.attach_to:
self._dropdown.dismiss()
