Kivy Multiselect Spinner：第二次添加一个项目，微调器表现得很奇怪

时间：2017-07-23 16:28:35

标签： python-3.x kivy kivy-language

Kivy 1.10.0 并使用kv文件作为我的Kivy语言。

Python 3.6

我有一个适用于mysql3的应用程序。该应用程序的一个页面允许我向数据库添加“闪存卡”。添加闪存卡时，其中一个表单元素使用Multiselect Spinner添加一个或多个标记，然后将此数据保存到数据库中。我第一次访问此页面时，我可以使用微调器并按预期添加所有内容。然后，如果我回去尝试添加第二张闪存卡，即使表格被清除，一切看起来与我第一次添加闪存卡的情况完全一样，微调器也会扼杀。数据似乎存储在某处，如第三个gif中所示，并以某种方式加载回微调器数据。 （'甲板'旋转器的问题是一样的。）

这个gif显示我第一次添加新卡时它正常工作：

enter image description here

这个gif显示我第二次添加新卡（无论我在添加两张卡之间做了什么，除了完全退出应用程序之外）：

enter image description here

此gif显示数据似乎保留：

enter image description here

因为代码很长，我只会添加我认为相关的内容。如果缺少某些东西，请告诉我，我会立即添加。

class NewFlashCardScreen(Screen):
    data = DictProperty({})
    data_fc_tag_ids = DictProperty({})
    data_fc_deck_ids = DictProperty({})
    __events__ = ('on_submit',)
    fc_tag_spinner_list = ListProperty(None)
    fc_deck_spinner_list = ListProperty(None)

    def on_parent(self, widget, parent):
        gd = App.get_running_app()
        self.fc_tag_spinner_list = []
        fc_tag_list = Queries.get_fc_tag_list()
        if len(fc_tag_list) > 0:
            for fc_tag in fc_tag_list:
                self.fc_tag_spinner_list.append(fc_tag[1])
                self.data_fc_tag_ids[fc_tag[1]] = fc_tag[0]
        else:
            self.fc_tag_spinner_list.append("")
        self.fc_deck_spinner_list = []
        fc_deck_list = Queries.get_fc_deck_list()
        if len(fc_deck_list) > 0:
            for fc_deck in fc_deck_list:
                self.fc_deck_spinner_list.append(fc_deck[1])
                self.data_fc_deck_ids[fc_deck[1]] = fc_deck[0]
        else:
            self.fc_deck_spinner_list.append("")

    def get_spinner_lists(self):
        pass

    def on_submit(self, data):
        gd = App.get_running_app()
        self.data['orig'] = gd.glob_dict['orig']
        title = data['fc_title'] if data['fc_title'] else " "
        front = data['fc_front'] if data['fc_front'] else " "
        back = data['fc_back'] if data['fc_back'] else " "
        difficulty = data['fc_difficulty'] if data['fc_difficulty'] else 0
        self.fc_id = MiscFuns.get_id(16)
        try:
            c.execute("""
                        INSERT INTO `tbl_learning_flash_cards` (`fc_id`,`fc_title`,`fc_front`,`fc_back`,`fc_difficulty`)
                        VALUES (?,?,?,?,?)
                    """, (self.fc_id, title, front, back, difficulty))
            conn.commit()
        except sqlite3.Error as e:
            print("An error occurred:", e.args[0])


class MultiSelectSpinner(Button):

    dropdown = ObjectProperty(None)
    values = ListProperty([])
    selected_values = ListProperty([])

    def __init__(self, **kwargs):
        self.values.clear()
        self.selected_values.clear()
        self.bind(dropdown=self.update_dropdown)
        self.bind(values=self.update_dropdown)
        super(MultiSelectSpinner, self).__init__(**kwargs)
        self.bind(on_release=self.toggle_dropdown)

    def toggle_dropdown(self, *args):
        if self.dropdown.parent:
            self.dropdown.dismiss()
        else:
            self.dropdown.open(self)

    def update_dropdown(self, *args):
        if not self.dropdown:
            self.dropdown = DropDown()
        values = self.values
        if values:
            if self.dropdown.children:
                self.dropdown.clear_widgets()
            for value in values:
                b = Factory.MultiSelectOption(text=value)
                b.bind(state=self.select_value)
                self.dropdown.add_widget(b)

    def select_value(self, instance, value):
        if value == 'down':
            if instance.text not in self.selected_values:
                self.selected_values.append(instance.text)
        else:
            if instance.text in self.selected_values:
                self.selected_values.remove(instance.text)

    def on_selected_values(self, instance, value):
        if value:
            self.text = ';'.join(value)
        else:
            self.text = ''

和kv文件：

<NewFlashCardScreen>:
BoxLayout:
    orientation: "vertical"
    BoxLayout:
        size_hint_y: 0.1
        Label:
            size_hint_x: 0.2
            text: "Card Title"
            text_size: self.text_size
            valign: 'middle'
        TextInput:
            id: new_fc_title
            multiline: False
            padding_y: [self.height / 2.0 - (self.line_height / 2.0) * len(self._lines), 0]
            text: root.data['fc_title'] if 'fc_title' in root.data else ""
            on_text: root.data['fc_title'] = self.text
        Label:
            size_hint_x: 0.2
            text: "Difficulty"
            text_size: self.text_size
            valign: 'middle'
    BoxLayout:
        size_hint_y: 0.1
        Label:
            size_hint_x: 0.2
            text: "Card Tag(s)"
            text_size: self.text_size
            valign: 'middle'
        BoxLayout:
            MultiSelectSpinner:
                id: new_fc_tag
                text: root.data['fc_tags'] if 'fc_tags' in root.data else "Select tag(s)"
                values: root.fc_tag_spinner_list
                on_text: root.data['fc_tags'] = self.text
            Button:
                size_hint_x: 0.3
                text: "New Tag"
                on_release: lib.Navigation.page_nav(dest='new_flash_card_tag', orig='new_flash_card', edit=False)
        BoxLayout:
            size_hint_x: 0.2
            TextInput:
                padding_y: [self.height / 2.0 - (self.line_height / 2.0) * len(self._lines), 0]
                id: new_fc_difficulty
                text: root.data['fc_difficulty'] if 'fc_difficulty' in root.data else "0"
                on_text: root.data['fc_difficulty'] = self.text
    BoxLayout:
        size_hint_y: 0.1
        Label:
            size_hint_x: 0.2
            text: "Card Deck(s)"
            text_size: self.text_size
            valign: 'middle'
        BoxLayout:
            MultiSelectSpinner:
                id: new_fc_deck
                text: root.data['fc_decks'] if 'fc_decks' in root.data else "Select deck(s)"
                values: root.fc_deck_spinner_list
                on_text: root.data['fc_decks'] = self.text
            Button:
                size_hint_x: 0.3
                text: "New Deck"
                on_release: lib.Navigation.page_nav(dest='new_flash_card_deck', orig='new_flash_card', edit=False)
        BoxLayout:
            size_hint_x: 0.2
    BoxLayout:
        orientation: "vertical"
        Label:
            size_hint_y: 0.1
            text: "Card Front"
        BoxLayout:
            TextInput:
                id: new_fc_front
                multiline: True
                text: root.data['fc_front'] if 'fc_front' in root.data else ""
                on_text: root.data['fc_front'] = self.text
            RstDocument:
                text: new_fc_front.text
                show_errors: True
    BoxLayout:
        orientation: "vertical"
        Label:
            size_hint_y: 0.1
            text: "Card Back"
        BoxLayout:
            TextInput:
                id: new_fc_back
                multiline: True
                text: root.data['fc_back'] if 'fc_back' in root.data else ""
                on_text: root.data['fc_back'] = self.text
            RstDocument:
                text: new_fc_back.text
                show_errors: True
    BoxLayout:
        size_hint_y: 0.2
        Button:
            text: "Cancel"
            on_release: lib.Navigation.page_nav(dest='prev_page', orig='new_flash_card', edit=False)
        Button:
            text: "Submit"
            on_release: root.dispatch('on_submit', root.data)

我已经尝试清除字典文件，self.data，self.data_fc_tag_ids和self.data_fc_deck_ids，但这没有帮助。

我不知道保留了哪些数据以及如何摆脱它。谢谢。

1 个答案:

答案 0 :(得分：0)

约翰，别哭！我得到了解决方案。这是路径：在kv文件中，我们首先可以提到Dropdown小部件，在Drop down下，我们将提到复选框，这就是答案。.这是kv文件代码：

DropDown:
                    padding: 0, 0, 0, root.width * 0.4
                    id: dropdown
                    on_select: btn.text = '{}'.format(args[1])

                    GridLayout:
                        size_hint_y: None
                        height: 44
                        cols: 2
                        row_default_height: '10dp'
                        Label:
                            id: person
                            text: 'Person'
                            text_size: self.size
                            valign: 'middle'
                        CheckBox:
                            text: 'check me'
                            on_active:
                                root.on_checkbox_active(person.text, self.active)
                    GridLayout:
                        size_hint_y: None
                        height: 44
                        cols: 2
                        row_default_height: '10dp'
                        Label:
                            id: vehicle
                            text: 'Vehicle'
                            text_size: self.size
                            valign: 'middle'
                        CheckBox:
                            id: vecle
                            text: 'check me'
                            on_active:
                                root.on_checkbox_active(vehicle.text, self.active)
                    GridLayout:
                        size_hint_y: None
                        height: 44
                        cols: 2
                        row_default_height: '10dp'
                        Label:
                            id: aircraft
                            text: 'Air_craft'
                            text_size: self.size
                            valign: 'middle'
                        CheckBox:
                            text: 'check me'
                            on_active:
                                root.on_checkbox_active(aircraft.text, self.active)

.py文件：

class My_class(BoxLayout):

def on_checkbox_active(checkbox_ref, name, checkbox_value):
    if checkbox_value:
        print('', name, 'is active')
    else:
        print('', name, 'is inactive')
pass
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