Kivy Multiselect Spinner: 2nd time adding an item, spinner behaves oddly - python-3.x

Question

Kivy 1.10.0 and using a kv file for my Kivy language.
Python 3.6
I have an app that works with mysql3. One page of the app allows me to add an 'flash card' to the database. One of the form elements when adding the flash card uses a Multiselect Spinner to add one or more tags, this data is then saved to the database. The first time I access this page, I can use the spinner and add everything as expected. Then if I go back to try to add a second flash card, even though the form is cleared and everything looks exactly as it does the first time I add a flash card, the spinner acts strangly. Data seems to be getting stored somewhere, as can be seen in the third gif, and somehow loaded back into the spinner data. (The problem is the same for the 'decks' spinner.)
This gif shows it working properly the first time I add a new card:
This gif shows the second time I add a new card (this happens regardless of what I do between adding the two cards, except quitting the app entirely):
This gif shows that data seems to be retained:
Because the code is long, I will add only what I believe relevant. If something is missing, please let me know and I'll add it right away.
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 = ''
And the kv file:
<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)
I've tried clearing the dictionary files, self.data, self.data_fc_tag_ids, and self.data_fc_deck_ids, but that doesn't help.
I have no idea what data is being retained and how to get rid of it. Thank you.

Answer 1

John Don't woory! I get the solution.. Here is the path: In kv file first we can mention Dropdown widget, under Drop down we will mention check boxes and this is the answer.. Here is the kv file code:
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)
The .py file:
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