Python ListAdapter.handle_selection方法代码示例

# 需要导入模块: from kivy.adapters.listadapter import ListAdapter [as 别名]
# 或者: from kivy.adapters.listadapter.ListAdapter import handle_selection [as 别名]
    def test_list_adapter_selection_mode_multiple_auto_selection(self):
        list_adapter = ListAdapter(
            data=fruit_data_items,
            args_converter=self.args_converter,
            selection_mode='multiple',
            propagate_selection_to_data=True,
            allow_empty_selection=False,
            cls=ListItemButton)
        list_view = ListView(adapter=list_adapter)

        # The reason why len(selection) == 1 here is because ListView,
        # at the end of its __init__(), calls check_for_empty_selection()
        # and triggers the initial selection, because allow_empty_selection is
        # False.
        self.assertEqual(len(list_adapter.selection), 1)
        apple = list_adapter.selection[0]
        self.assertEqual(apple.text, 'Apple')

        # Add Avocado to the selection, doing necessary steps on data first.
        self.assertEqual(fruit_data_items[1].name, 'Avocado')
        fruit_data_items[1].is_selected = True
        avocado = list_view.adapter.get_view(1)  # does selection
        self.assertEqual(avocado.text, 'Avocado')
        self.assertEqual(len(list_adapter.selection), 2)

        # Re-selection of the same item should decrease the len by 1.
        list_adapter.handle_selection(avocado)
        self.assertEqual(len(list_adapter.selection), 1)
        # And now only apple should be in selection.
        self.assertEqual(list_adapter.selection, [apple])

        # Selection of several different items should increment len,
        # because we have selection_mode as multiple.
        #
        # avocado has been unselected. Select it again.
        list_adapter.handle_selection(avocado)
        self.assertEqual(len(list_adapter.selection), 2)
        self.assertEqual(list_adapter.selection, [apple, avocado])

        # And select some different ones.
        self.assertEqual(fruit_data_items[2].name, 'Banana')
        fruit_data_items[2].is_selected = True
        banana = list_view.adapter.get_view(2)  # does selection
        self.assertEqual(list_adapter.selection, [apple, avocado, banana])
        self.assertEqual(len(list_adapter.selection), 3)

# 需要导入模块: from kivy.adapters.listadapter import ListAdapter [as 别名]
# 或者: from kivy.adapters.listadapter.ListAdapter import handle_selection [as 别名]
    def test_list_adapter_selection_handle_selection(self):
        list_adapter = ListAdapter(data=fruit_data_items,
                                   args_converter=self.args_converter,
                                   selection_mode='single',
                                   propagate_selection_to_data=True,
                                   allow_empty_selection=False,
                                   cls=ListItemButton)

        selection_observer = FruitSelectionObserver()
        list_adapter.bind(
                on_selection_change=selection_observer.on_selection_change)

        list_view = ListView(adapter=list_adapter)

        self.assertEqual(selection_observer.call_count, 0)

        # From the check for initial selection, we should have apple selected.
        self.assertEqual(list_adapter.selection[0].text, 'Apple')
        self.assertEqual(len(list_adapter.selection), 1)

        # Go through the tests routine to trigger selection of banana.
        # (See notes above about triggering selection in tests.)
        self.assertEqual(fruit_data_items[2].name, 'Banana')
        fruit_data_items[2].is_selected = True
        banana = list_view.adapter.get_view(2)  # does selection
        self.assertTrue(banana.is_selected)

        # Now unselect it with handle_selection().
        list_adapter.handle_selection(banana)
        self.assertFalse(banana.is_selected)

        # But, since we have allow_empty_selection=False, Apple will be
        # reselected.
        self.assertEqual(selection_observer.fruit_name, 'Apple')

        # Call count:
        #
        # Apple got selected initally (0), then unselected when Banana was
        # selected (1). Then banana was unselected, causing reselection of
        # Apple (3). len should be 1.
        self.assertEqual(selection_observer.call_count, 3)
        self.assertEqual(len(list_adapter.selection), 1)

# 需要导入模块: from kivy.adapters.listadapter import ListAdapter [as 别名]
# 或者: from kivy.adapters.listadapter.ListAdapter import handle_selection [as 别名]
class NewProjectDialog(BoxLayout):

    listview = ObjectProperty(None)
    ''':class:`~kivy.uix.listview.ListView` used for showing file paths.
       :data:`listview` is a :class:`~kivy.properties.ObjectProperty`
    '''

    select_button = ObjectProperty(None)
    ''':class:`~kivy.uix.button.Button` used to select the list item.
       :data:`select_button` is a :class:`~kivy.properties.ObjectProperty`
    '''

    cancel_button = ObjectProperty(None)
    ''':class:`~kivy.uix.button.Button` to cancel the dialog.
       :data:`cancel_button` is a :class:`~kivy.properties.ObjectProperty`
    '''

    adapter = ObjectProperty(None)
    ''':class:`~kivy.uix.listview.ListAdapter` used for selecting files.
       :data:`adapter` is a :class:`~kivy.properties.ObjectProperty`
    '''

    image = ObjectProperty(None)
    '''Type of :class:`~kivy.uix.image.Image` to display image of selected
       new template.
       :data:`image` is a :class:`~kivy.properties.ObjectProperty`
    '''

    list_parent = ObjectProperty(None)
    '''Parent of listview.
       :data:`list_parent` is a :class:`~kivy.properties.ObjectProperty`
    '''

    prev_selection = NumericProperty(0)
    '''to memorize the previous selection.
       :attr:`prev_selection` is a :class:
       `~kivy.properties.NumericProperty`, defaults to (0).
    '''

    __events__ = ('on_select', 'on_cancel')

    def __init__(self, **kwargs):
        super(NewProjectDialog, self).__init__(**kwargs)
        item_strings = list(NEW_PROJECTS.keys())
        item_strings.sort()
        self.adapter = ListAdapter(cls=Factory.DesignerListItemButton,
                                   data=item_strings,
                                   selection_mode='single',
                                   allow_empty_selection=False)
        self.adapter.check_for_empty_selection = self.check_for_empty_selection
        self.adapter.bind(on_selection_change=self.on_adapter_selection_change)
        self.listview = ListView(adapter=self.adapter)
        self.listview.size_hint = (0.5, 1)
        self.listview.pos_hint = {'top': 1}
        self.list_parent.add_widget(self.listview, 1)
        self.on_adapter_selection_change(self.adapter)

    def on_parent(self, *args):
        if self.parent:
            Window.bind(on_key_down=self._on_keyboard_down)
        else:
            Window.unbind(on_key_down=self._on_keyboard_down)

    def _on_keyboard_down(self, keyboard, key, codepoint,
                          text, modifier, *args):
        '''To detect which key is pressed
        '''
        if modifier:
            return False
        key_str = Keyboard.keycode_to_string(Window._system_keyboard, key)
        if key_str == 'up':
            v = self.adapter.get_view(self.prev_selection - 1)
            if v is not None:
                self.adapter.handle_selection(v)
                return True
        if key_str == 'down':
            v = self.adapter.get_view(self.prev_selection + 1)
            if v is not None:
                self.adapter.handle_selection(v)
                return True
        if key_str == 'enter':
            self.dispatch('on_select')
            return True

    def check_for_empty_selection(self, *args):
        if not self.adapter.allow_empty_selection:
            if len(self.adapter.selection) == 0:
                # Select the first item if we have it.
                v = self.adapter.get_view(self.prev_selection)
                if v is not None:
                    self.adapter.handle_selection(v)

    def on_adapter_selection_change(self, adapter):
        '''Event handler for 'on_selection_change' event of adapter.
        '''
        name = adapter.selection[0].text.lower() + '.png'
        name = name.replace(' and ', '_')
        image_source = join(NEW_TEMPLATE_IMAGE_PATH, name)
        _dir = get_kd_dir()
        image_source = join(_dir, image_source)
#.........这里部分代码省略.........