In Flutter Cartesian Chart widget, you can synchronize the trackball of multiple charts using the available callback events and public methods. A callback event is a callback function or method, which you can pass as an argument to another function or method. It can perform an action when you require it, and public methods are methods that can be called by using the class object where they are defined. The callback event used for synchronizing trackball is the onChartTouchInteractionMove and the show public method of the trackball is used for activating the trackball in multiple charts in a synchronized fashion on user interaction.

Documentation: https://help.syncfusion.com/flutter/cartesian-charts/callbacks#oncharttouchinteractionmove

• VS Code
• Flutter SDK v2.0.0+
• For more development tools

To run this application, you need to first clone or download the ‘synchronized trackball flutter chart’ repository and open it in your preferred IDE. Then, build and run your project to view the output.

For more help, check the Syncfusion Flutter documentation, or Flutter documentation.