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