Title

Changing the Active Item of a MDSegmentedControl in KivyMD

What will you learn?

Discover how to dynamically change the active item of an MDSegmentedControl in KivyMD through Python code.

Introduction to the Problem and Solution

In this guide, we delve into the process of altering the active item of an MDSegmentedControl within the KivyMD framework. The MDSegmentedControl component enables users to choose from various options represented as segments. By programmatically changing the active item, we can control which segment is currently selected.

To accomplish this task effectively, we need to grasp how MDSegmentedControl functions in KivyMD and utilize Python code to modify its behavior accordingly.

Code

# Import necessary libraries
from kivymd.app import MDApp
from kivymd.uix.screen import Screen
from kivymd.uix.button import MDSegmentedControl

class SegmentedControlApp(MDApp):
    def build(self):
        screen = Screen()

        # Define segmented control options
        segments = ["Option 1", "Option 2", "Option 3"]

        # Create segmented control widget
        seg_control = MDSegmentedControl(
            values=segments,
            on_press=self.on_segment_change  # Callback function when a segment is pressed
        )

        screen.add_widget(seg_control)
        return screen

    def on_segment_change(self, instance_seg_control, instance_segment):
        print("Selected segment:", instance_segment.text)

# Run the application    
if __name__ == '__main__':
    SegmentedControlApp().run()

# Copyright PHD

Note: Prior to running this code snippet, ensure that you have installed the KivyMD library. For installation guidance, visit PythonHelpDesk.com.

Explanation

• The provided code establishes a basic Kivy application containing an MDSegmentedControl.
• Three segments (“Option 1”, “Option 2”, “Option 3”) are defined for our segmented control.
• Upon user selection of any segment, it displays which segment was chosen.

To modify the active item of MDSegmentedControl, you must adjust its state within your event handling method (such as on_press in this case). Depending on your specific needs, you can modify attributes or internal states of the MDSegmentedControl.

How can I set a default/active item for my MDSegmentedControl?

You can designate a default/active item by setting its current_item attribute with an index corresponding to one of your defined segments.

Can I dynamically change available options after initializing an MDSegmenteedControL?

Yes, you can update its values dynamically using .values = new_values_list.

Is it possible to customize appearance like colors or size of individual segments?

Certainly! Customize appearance using properties like .segment_color, .segment_disabled_color, and .segment_text_color.

Does MDSegmenteControL support icons along with text for each option?

Absolutely! Incorporate icons alongside text using properties like .icon.

How do I disable user interaction temporarily on certain segments?

You can temporarily disable user interaction on specific segments by adjusting their disabled state using their respective indices.

Conclusion

Mastering how to manipulate the active item of an MDSegmenteeControL in KivyMD involves understanding event handling mechanisms provided by Kivy’s widgets and components. By implementing suitable callbacks and modifying relevant attributes or states within these callbacks, you gain precise control over UI element behaviors.

Don’t hesitate to explore diverse styling options and additional functionalities offered by KiviMD’s extensive ecosystem!