CODEWITHSUNDEEP
pythonkivykivy-languagekivymd
StevenHaven
StevenHaven

Reputation: 3

How to access widgets from another Dynamic Class in kv?

Is there a way to access a widget from another Dynamic Class in Kivy? I'm trying to trigger some event from a dynamic class which is going to have an effect on a other dynamic class.

Here's an example:

Python:

from kivy.app import App
from kivy.lang.builder import Builder

Builder.load_file("ui version control/dropdowns_and_buttons.kv")

class MyApp(App):
    def build(self):
        return Builder.load_file("main_ui.kv")

MyApp().run()

The main_ui.kv file:

MDGridLayout:
    dropdown_default: "-- Select --"
    cols: 2
    size_hint: 1, 0.3
    pos_hint: {"center": (0.5, 0.65)}
    spacing: 30

    DropdownMenu:
        id: name_menu
        text: root.dropdown_default
        color: (0.5, 0.5, 0.5, 0.7) if self.text == root.dropdown_default else app.theme_cls.text_color
        values: ['name1', 'name2', 'name3']
        on_text: self.text

    DropdownMenu:
        id: number_menu
        text: root.dropdown_default
        color: (0.5, 0.5, 0.5, 0.7) if self.text == root.dropdown_default else app.theme_cls.text_color
        values: [f"{i}" for i in range(1, 46)]
        on_text: self.text

And an additional dropdowns_and_buttons.kv file having custom dropdown widget and button in a separate kv file

<DropdownMenu@Spinner>:
    dropdown_cls: Factory.CustomDropdown
    option_cls: Factory.DropdownOptions
    background_normal: ""
    background_color: 0, 0, 0, 0
    canvas.before:
        Color:
            rgba: 0, 0, 0, 0.4
        RoundedRectangle:
            size: self.size
            pos: self.pos
            radius: [6]
        Color: 
            rgba: 0.5, 0.4, 0.5, 0.5
        Line:
            width: 1
            rounded_rectangle: self.x, self.y, self.width, self.height, 6, 6, 6, 6, 100

    MDLabel:
        id: dd_label
        text: "Changing text"
        center_x: root.center_x + 110
        center_y: root.center_y

<DropdownOptions@SpinnerOption>:
    background_normal: ""
    background_color: 0, 0, 0, 0                           
    canvas:
        Color:
            rgba: 0.4, 0.4, 0.4, 0.6
        Line:
            width: 1
            points: self.x+10, self.y, self.width-10, self.y

<CustomDropdown@DropDown>:
    canvas.before:
        Color:
            rgba: 0, 0, 0, 0.4
        RoundedRectangle:
            size: self.size
            pos: self.pos
            radius: [0, 0, 6, 6]
    on_dismiss: print(root.DropdownMenu.ids.dd_label.text)

I'm trying to use dd_label widget from DropdownMenu class in CustomDropdown class. So far, I can access it using app.root.ids.name_menu.ids.dd_label on on_dismiss but, I feel like it's not an ideal way to go about it.

Now, I know on_dismiss will throw an error because it's not accessing the intended widget MDLabel from DropdownMenu class.

Can someone help me figure out how I can access dd_label widget from CustomDropdown class?

Upvotes: 0

Views: 217

Answers (2)

StevenHaven
StevenHaven

Reputation: 3

Found a way. To use widgets from other dynamic class, I needed to use Factory to create an instance of DropdownMenu in CustomDropdown class.

Like this: on_dismiss: print(Factory.DropdownMenu().ids.dd_label.text)

Upvotes: 0

Tshirtman
Tshirtman

Reputation: 5949

I would use the attach_to property of the DropDown class, which will reference the Spinner/DropDownMenu instance.

on_select: print(self.attach_to.ids.dd_label.text).

https://kivy.org/doc/stable/api-kivy.uix.dropdown.html?highlight=dropdown#kivy.uix.dropdown.DropDown.attach_to

Upvotes: 1

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