mirror of https://github.com/kivy/kivy.git
98 lines
3.3 KiB
Python
98 lines
3.3 KiB
Python
from kivy.adapters.dictadapter import DictAdapter
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from kivy.uix.gridlayout import GridLayout
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from kivy.uix.listview import ListView, ListItemButton
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from fixtures import fruit_categories, fruit_categories, \
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fruit_data
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from fruit_detail_view import FruitDetailView
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# A custom adapter is needed here, because we must transform the selected
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# fruit category into the list of fruit keys for that category.
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class FruitsDictAdapter(DictAdapter):
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def fruit_category_changed(self, fruit_categories_adapter, *args):
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if len(fruit_categories_adapter.selection) == 0:
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self.data = {}
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return
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category = \
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fruit_categories[fruit_categories_adapter.selection[0].text]
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self.sorted_keys = category['fruits']
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class CascadingView(GridLayout):
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'''Implementation of a cascading style display, with a scrollable list of
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fruit categories on the left, a list of fruits for the selected category
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in the middle, and a fruit detail view on the right.
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This examples uses :class:`DictAdapter`. See an equivalent treatment done
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with :class:`ListAdapter` in list_cascade.py.
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See list_cascade_images.py for the same example, also using
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:class:`DictAdapter`, and with images of fruit in fruit list items and in
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the detail view.
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'''
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def __init__(self, **kwargs):
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kwargs['cols'] = 3
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super(CascadingView, self).__init__(**kwargs)
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list_item_args_converter = \
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lambda row_index, rec: {'text': rec['name'],
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'size_hint_y': None,
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'height': 25}
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# Fruit categories list on the left:
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#
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categories = sorted(fruit_categories.keys())
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fruit_categories_dict_adapter = \
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DictAdapter(
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sorted_keys=categories,
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data=fruit_categories,
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args_converter=list_item_args_converter,
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selection_mode='single',
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allow_empty_selection=False,
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cls=ListItemButton)
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fruit_categories_list_view = \
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ListView(adapter=fruit_categories_dict_adapter,
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size_hint=(.2, 1.0))
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self.add_widget(fruit_categories_list_view)
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fruits_dict_adapter = \
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FruitsDictAdapter(
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sorted_keys=fruit_categories[categories[0]]['fruits'],
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data=fruit_data,
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args_converter=list_item_args_converter,
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selection_mode='single',
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allow_empty_selection=False,
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cls=ListItemButton)
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fruit_categories_dict_adapter.bind(
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on_selection_change=fruits_dict_adapter.fruit_category_changed)
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fruits_list_view = \
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ListView(adapter=fruits_dict_adapter,
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size_hint=(.2, 1.0))
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self.add_widget(fruits_list_view)
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# Detail view, for a given fruit, on the right:
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#
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detail_view = FruitDetailView(
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fruit_name=fruits_dict_adapter.selection[0].text,
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size_hint=(.6, 1.0))
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fruits_dict_adapter.bind(
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on_selection_change=detail_view.fruit_changed)
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self.add_widget(detail_view)
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if __name__ == '__main__':
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from kivy.base import runTouchApp
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runTouchApp(CascadingView(width=800))
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