mirror of https://github.com/kivy/kivy.git
93 lines
3.2 KiB
Python
93 lines
3.2 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[str(fruit_categories_adapter.selection[0])]
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self.sorted_keys = category['fruits']
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class CascadingView(GridLayout):
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'''Implementation of a master-detail style view, with a scrollable list
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of fruit categories on the left, a list of fruits for the selected
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category in the middle, and a detail view on the right.
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'''
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def __init__(self, **kwargs):
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kwargs['cols'] = 3
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kwargs['size_hint'] = (1.0, 1.0)
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super(CascadingView, self).__init__(**kwargs)
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list_item_args_converter = lambda 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(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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# Force triggering of on_selection_change() for the DetailView, for
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# correct initial display.
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fruits_dict_adapter.touch_selection()
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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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