How to use spinner widget in Kivy

by l.rohitharohitha2001@gmail.com Updated: Sep 6, 2023

Solution Kit

Kivy is an open-source framework for developing multitouch applications. It provides tools for creating user interfaces and handling user interactions.

At the same time, Kivy offers a wide range of UI components. It includes buttons, labels, sliders, and text inputs. In the context of user interfaces, a spinner is a graphical control element. It consists of a text box and two buttons, one to increment the value and another to decrement it. Users can cycle through the available options when interacting with the spinner.

Features of Kivy Spinner:

Bearings and Rotation: In a spinner control, the term bearings to the central point around. When users interact with the spinner, it might rotate clockwise or counterclockwise. Designing the rotation behavior to feel smooth and responsive is important.
Options Display: A spinner should visually represent the available options. This could be a circular arrangement of items around the bearings or a vertical list. Consider the best way to display options based on the number of options and the availability.
User Interaction: Users should be able to interact with the spinner. The interaction should feel intuitive and consistent with the platform's conventions.
Animation: Smooth animation is crucial for a spinner's appearance and usability. The animation should be fluid when the spinner rotates to reveal different options.
Selection Feedback: Users need to know which option is currently selected. You can indicate this by highlighting the selected option or using other visuals.
Customization: Design the spinner to be a customizable appearance. This might include options to change the colors, fonts, and styles to match the App's design theme.
Accessibility: Ensure that the spinner is accessible to all users. Consider offering alternative ways of interacting with the spinner for users.

There is no recognized concept of a Kivy spinner in the context of user interfaces. Kivy is an open-source Python framework used for creating multitouch applications. It does not include a standard spinner widget in its library. It is essential to consider the usability, customization, and integration aspects. A good spinner control in Kivy should have smooth animations. Users should find it easy to use, and it should work on different platforms. To make your Kivy app easy for users, customize it, make it accessible, and integrate it smoothly.

Fig: Preview of the output that you will get on running this code from your IDE.

Code

In this solution we are using Kivy library of Python.

PythonLines of Code : 35License : Strong Copyleft (CC BY-SA 4.0)

    def update_collected_info(self, text):
        self.collected_info['Client'] = text
        # Access the dropdown.
        dropdown = self.ids.object_dropdown
        # Now map separately or use a predefined dictionary for efficient access.
        if text == "MUP":
            dropdown.values = self.mup
        elif text == "Olaf Sitte":
            dropdown.values = self.olaf
        elif text == "FNB":
            dropdown.values = self.fnb
        print(self.collected_info)

        ...
        GridLayout:
            cols:3
            size: 50,50
            ToggleButton:
                group: 'client'
                text: 'MUP'
                # Assuming the value for the key "Client" will always be its text.
                # If necessary change and pass something you need.
                on_press: root.update_collected_info(self.text)
            ToggleButton:
                group: 'client'
                text: 'Olaf Sitte'
                on_press: root.update_collected_info(self.text)
            ToggleButton:
                group: 'client'
                text: 'FNB'
                on_press: root.update_collected_info(self.text)
        Spinner:
            id: object_dropdown
        ...

Instructions

Follow the steps carefully to get the output easily.

Download and Install the PyCharm Community Edition on your computer.
Open the terminal and install the required libraries with the following commands.
Install Kivy - pip install Kivy.
Create a new Python file on your IDE.
Copy the snippet using the 'copy' button and paste it into your Python file.
Remove 17 to 33 lines from the code.
Run the current file to generate the output.

I hope you found this useful.

I found this code snippet by searching for 'How to manage values for a kivy spinner Widget in KV'in Kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

PyCharm Community Edition 2023.1
The solution is created in Python 3.8 Version
Kivy 2.2.1 Version

Using this solution, we can be able to use spinner widget in Kivy with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to use spinner widget in Kivy.

Dependent Library

kivyby kivy

Python

15962

Version:2.2.0

License: Permissive (MIT)

Open source UI framework written in Python, running on Windows, Linux, macOS, Android and iOS

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Reuse

kivyby kivy

Python 15962 Version:2.2.0 License: Permissive (MIT)

Open source UI framework written in Python, running on Windows, Linux, macOS, Android and iOS

Support

Quality

Security

License

Reuse

You can search for any dependent library on Kandi like 'Kivy'.

FAQ:

1. How can I access the currently selected value from a Spinner widget?

The current selected value from a spinner widget.

Create the Spinner Widget: First, you would create a Spinner widget and set its options. The options would be the values that users can select from.
Binding the Selection: Designing the Spinner widget determines how to bind the selection. You can use the bind method to set up an event listener that triggers when the selection changes.
Accessing the Selected Value: The event listener can update when the selection changes. You can then access this variable to retrieve the currently selected value.

2. How do I create an App class that uses different spinner widgets?

You can follow these steps to build a Kivy app with different Spinner widgets. Remember that Kivy's features may have changed, and these steps depend on its details.

Import Required Modules: Import the necessary modules from the Kivy library to build.
Create Your App Class: Define your custom app class that inherits from the App. In this class, you'll define the UI elements and their behavior.
Run Your App: Instantiate your custom app class and run it.

3. What is the difference between a dropdown list and a spinner widget in Kivy?

Dropdown List:

A dropdown list is a common user interface element that presents a list of options. It consists of a closed state where only the currently selected option is visible and an open state. Here are some characteristics of a dropdown list:

Closed/Open State: The dropdown starts in a closed state, displaying the selected. When the user interacts with it, the dropdown opens to show all available options.
Single-Selection: Usually, users can only choose one option from a dropdown list.
Space-Efficient: A dropdown is compact when closed, saving space on the user interface.
Selection Visibility: You can see the selected option when you close the dropdown.
Dropdown Icon: An icon or arrow often indicates the element is dropdown.

Spinner Widget (Hypothetical):

Like a dropdown list, a spinner widget lets users select items in Kivy or other contexts. But it could have unique features or behaviors.

Continuous Interaction: Users can use a spinner widget to cycle through options.
Visual Rotation: Instead of a dropdown's open/close transition, a spinner widget.
Circular Arrangement: Spinner widgets could present options in a circular arrangement around.

4. Are there any specific formatting rules for on_spinner_select methods in Kivy applications?

In Kivy, event handling methods follow a convention. They begin with "on_" and include the widget name and event. Create an event handler named on_my_spinner_select. Use it for the selection event of a widget called MySpinner.

5. What are the best ways to use spinners with other widgets in Kivy applications?

Those are the best practices when using spinners with other widgets in Kivy.

Clear Labeling and Context: Make sure to label your spinner and explain what it does clearly. Users should understand the purpose of the spinner and the options they can choose from.
Limited Options: Keep the number of options manageable to avoid overwhelming users. More choices can make the selection process easier.
Default Selection: Set a sensible default selection that's meaningful to users. This can provide a starting point and reduce the likelihood of errors.
Consistency in Styling: Keep the same look for your spinner and other widgets. Consistency helps users recognize interactive elements.
Appropriate Sizes: Size your spinner appropriately so that it's easy to interact with. It shouldn't be too small or too large but should fit well within the App's layout.
Responsive Interaction: Ensure that the spinner responds promptly to user interaction. Slow or unresponsive behavior can frustrate users.
Clear Feedback: Provide visual or auditory feedback when you select an option. This reassures users that they have successfully registered their interaction.

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