Scratch-blocks is a block-based visual programming library and framework used to create graphical programming interfaces. It provides a visual environment that translates interlocking blocks into executable code, serving as a foundation for educational coding interfaces and visual programming languages.
The project is implemented as a customized extension of the Google Blockly ecosystem. It enables the development of domain-specific languages through a drag-and-drop interface, supporting the creation of custom block libraries and no-code tool development.
The framework handles the structural mechanisms of block-based systems, including constraint-based snapping, coordinate-based positioning, and event-driven input. It manages program state through JSON-based serialization and uses schema-driven definitions to determine block appearance and connectivity.