from kivy.adapters.listadapter import ListAdapter, ListsAdapter from kivy.uix.gridlayout import GridLayout from kivy.uix.label import Label from kivy.uix.listview import ListView, ListItemButton from kivy.properties import StringProperty # This is an expansion on the "master-detail" example to illustrate # cascading from the selection of one list view to another. In this # example the lists are restricted to single selection. The list on the # left is a simple list. The list in the middle is specialized for # observing the selection in the first, and using that item as the key # into a dict providing its own list items. The view on the right is # the sames as the DetailView in the master-detail example. class DetailView(GridLayout): fruit_name = StringProperty('') def __init__(self, **kwargs): kwargs['cols'] = 2 super(DetailView, self).__init__(**kwargs) def redraw(self, *args): self.clear_widgets() self.add_widget(Label(text="Name:", halign='right')) self.add_widget(Label(text=self.fruit_name)) for category in descriptors: self.add_widget(Label(text="{0}:".format(category), halign='right')) self.add_widget( Label(text=str(fruit_data[self.fruit_name][category]))) def on_selection_change(self, list_adapter, *args): if len(list_adapter.selection) == 0: return selected_object = list_adapter.selection[0] if type(selected_object) is str: self.fruit_name = selected_object else: self.fruit_name = str(selected_object) self.redraw() class CascadingView(GridLayout): '''Implementation of a master-detail style view, with a scrollable list of fruit categories on the left (source list), a list of fruits for the selected category in the middle, and a detail view on the right. ''' def __init__(self, **kwargs): kwargs['cols'] = 3 kwargs['size_hint'] = (1.0, 1.0) super(CascadingView, self).__init__(**kwargs) list_item_args_converter = lambda x: {'text': x, 'size_hint_y': None, 'height': 25} # Fruit categories list on the left: # categories = sorted(fruit_categories.keys()) fruit_categories_list_adapter = \ ListAdapter(data=categories, args_converter=list_item_args_converter, selection_mode='single', allow_empty_selection=False, cls=ListItemButton) fruit_categories_list_view = \ ListView(adapter=fruit_categories_list_adapter, size_hint=(.2, 1.0)) self.add_widget(fruit_categories_list_view) # Fruits, for a given category, in the middle: # fruits_list_adapter = \ ListsAdapter( observed_list_adapter=fruit_categories_list_adapter, lists_dict=fruit_categories, data=fruit_categories[categories[0]], args_converter=list_item_args_converter, selection_mode='single', allow_empty_selection=False, cls=ListItemButton) fruits_list_view = \ ListView(adapter=fruits_list_adapter, size_hint=(.2, 1.0)) fruit_categories_list_adapter.bind( on_selection_change=fruits_list_adapter.on_selection_change) self.add_widget(fruits_list_view) # Detail view, for a given fruit, on the right: # detail_view = DetailView( observed_list_adapter=fruits_list_adapter, size_hint=(.6, 1.0)) fruits_list_adapter.bind( on_selection_change=detail_view.on_selection_change) self.add_widget(detail_view) # Force triggering of on_selection_change() for the DetailView, for # correct initial display. fruits_list_adapter.touch_selection() # Data from http://www.fda.gov/Food/LabelingNutrition/\ # FoodLabelingGuidanceRegulatoryInformation/\ # InformationforRestaurantsRetailEstablishments/\ # ucm063482.htm fruit_categories = \ {'Melons': ['Cantaloupe', 'Honeydew Melon', 'Watermelon'], 'Tree Fruits': ['Apple', 'Avocado, California', 'Banana', 'Nectarine', 'Peach', 'Pear', 'Pineapple', 'Plums', 'Sweet Cherries'], 'Citrus Fruits': ['Grapefruit', 'Lemon', 'Lime', 'Orange', 'Tangerine'], 'Miscellaneous Fruits': ['Grapes', 'Kiwifruit', 'Strawberries']} descriptors = """(gram weight/ ounce weight) Calories Calories from Fa t Total Fat Sodium Potassium Total Carbo-hydrate Dietary Fiber Suga rs Protein Vitamin A Vitamin C Calcium Iron""".replace('\n', '') descriptors = [item.strip() for item in descriptors.split('\t')] units = """(g) (%DV) (mg) (%DV) (mg) (%DV) (g) (%DV) (g) (%DV) (g) (g) (%DV) (%DV) (%DV) (%DV)""".replace('\n', '') units = [item.strip() for item in units.split('\t')] raw_fruit_data = [ {'name':'Apple', 'Serving Size': '1 large (242 g/8 oz)', 'data': [130, 0, 0, 0, 0, 0, 260, 7, 34, 11, 5, 20, 25, 1, 2, 8, 2, 2]}, {'name':'Avocado, California', 'Serving Size': '1/5 medium (30 g/1.1 oz)', 'data': [50, 35, 4.5, 7, 0, 0, 140, 4, 3, 1, 1, 4, 0, 1, 0, 4, 0, 2]}, {'name':'Banana', 'Serving Size': '1 medium (126 g/4.5 oz)', 'data': [110, 0, 0, 0, 0, 0, 450, 13, 30, 10, 3, 12, 19, 1, 2, 15, 0, 2]}, {'name':'Cantaloupe', 'Serving Size': '1/4 medium (134 g/4.8 oz)', 'data': [50, 0, 0, 0, 20, 1, 240, 7, 12, 4, 1, 4, 11, 1, 120, 80, 2, 2]}, {'name':'Grapefruit', 'Serving Size': '1/2 medium (154 g/5.5 oz)', 'data': [60, 0, 0, 0, 0, 0, 160, 5, 15, 5, 2, 8, 11, 1, 35, 100, 4, 0]}, {'name':'Grapes', 'Serving Size': '3/4 cup (126 g/4.5 oz)', 'data': [90, 0, 0, 0, 15, 1, 240, 7, 23, 8, 1, 4, 20, 0, 0, 2, 2, 0]}, {'name':'Honeydew Melon', 'Serving Size': '1/10 medium melon (134 g/4.8 oz)', 'data': [50, 0, 0, 0, 30, 1, 210, 6, 12, 4, 1, 4, 11, 1, 2, 45, 2, 2]}, {'name':'Kiwifruit', 'Serving Size': '2 medium (148 g/5.3 oz)', 'data': [90, 10, 1, 2, 0, 0, 450, 13, 20, 7, 4, 16, 13, 1, 2, 240, 4, 2]}, {'name':'Lemon', 'Serving Size': '1 medium (58 g/2.1 oz)', 'data': [15, 0, 0, 0, 0, 0, 75, 2, 5, 2, 2, 8, 2, 0, 0, 40, 2, 0]}, {'name':'Lime', 'Serving Size': '1 medium (67 g/2.4 oz)', 'data': [20, 0, 0, 0, 0, 0, 75, 2, 7, 2, 2, 8, 0, 0, 0, 35, 0, 0]}, {'name':'Nectarine', 'Serving Size': '1 medium (140 g/5.0 oz)', 'data': [60, 5, 0.5, 1, 0, 0, 250, 7, 15, 5, 2, 8, 11, 1, 8, 15, 0, 2]}, {'name':'Orange', 'Serving Size': '1 medium (154 g/5.5 oz)', 'data': [80, 0, 0, 0, 0, 0, 250, 7, 19, 6, 3, 12, 14, 1, 2, 130, 6, 0]}, {'name':'Peach', 'Serving Size': '1 medium (147 g/5.3 oz)', 'data': [60, 0, 0.5, 1, 0, 0, 230, 7, 15, 5, 2, 8, 13, 1, 6, 15, 0, 2]}, {'name':'Pear', 'Serving Size': '1 medium (166 g/5.9 oz)', 'data': [100, 0, 0, 0, 0, 0, 190, 5, 26, 9, 6, 24, 16, 1, 0, 10, 2, 0]}, {'name':'Pineapple', 'Serving Size': '2 slices, 3" diameter, 3/4" thick (112 g/4 oz)', 'data': [50, 0, 0, 0, 10, 0, 120, 3, 13, 4, 1, 4, 10, 1, 2, 50, 2, 2]}, {'name':'Plums', 'Serving Size': '2 medium (151 g/5.4 oz)', 'data': [70, 0, 0, 0, 0, 0, 230, 7, 19, 6, 2, 8, 16, 1, 8, 10, 0, 2]}, {'name':'Strawberries', 'Serving Size': '8 medium (147 g/5.3 oz)', 'data': [50, 0, 0, 0, 0, 0, 170, 5, 11, 4, 2, 8, 8, 1, 0, 160, 2, 2]}, {'name':'Sweet Cherries', 'Serving Size': '21 cherries; 1 cup (140 g/5.0 oz)', 'data': [100, 0, 0, 0, 0, 0, 350, 10, 26, 9, 1, 4, 16, 1, 2, 15, 2, 2]}, {'name':'Tangerine', 'Serving Size': '1 medium (109 g/3.9 oz)', 'data': [50, 0, 0, 0, 0, 0, 160, 5, 13, 4, 2, 8, 9, 1, 6, 45, 4, 0]}, {'name':'Watermelon', 'Serving Size': '1/18 medium melon; 2 cups diced pieces (280 g/10.0 oz)', 'data': [80, 0, 0, 0, 0, 0, 270, 8, 21, 7, 1, 4, 20, 1, 30, 25, 2, 4]}] fruit_data = {} descriptors_and_units = dict(zip(descriptors, units)) for row in raw_fruit_data: fruit_data[row['name']] = {} fruit_data[row['name']] = dict({'Serving Size': row['Serving Size']}, **dict(zip(descriptors_and_units.keys(), row['data']))) if __name__ == '__main__': from kivy.base import runTouchApp # All fruit categories will be shown in the left left (first argument), # and the first category will be auto-selected -- Melons. So, set the # second list to show the melon fruits (second argument). runTouchApp(CascadingView(width=800))