What is the role of the RenderBox class in the Flutter interface rendering system?

The RenderBox class in Flutter is responsible for the basic implementation of a visual element with a rectangular area on the screen. It is part of the rendering system and serves as the foundation for creating custom widgets that require control over size, positioning, and rendering.

Main functions of RenderBox:

• Defining sizes (performLayout methods)
• Rendering content (paint method)
• Handling input and interaction events

RenderBox operates at the rendering level, below the widget and element levels, allowing precise control over how and where the element is displayed.

Example: if you need to create a custom widget with non-standard rendering, inherit from RenderBox and override the layout and paint methods.