How Kraken’s Event Channel Bridges Flutter and JavaScript: A Deep Dive
This article explains Kraken’s three‑layer event channel, detailing how event registration on the JS side is translated into Flutter commands, how those commands travel through the C++ engine, and how pointer events are finally dispatched back to JavaScript callbacks.
Introduction
Kraken is a high‑performance rendering engine that implements the W3C DOM API on top of a Flutter rendering backend. It provides a three‑layer event channel (JS business layer, Flutter container layer, C++ engine layer) with two pipelines: event registration and event dispatch.
Architecture Overview
The event channel consists of:
JS side: standard addEventListener calls.
Flutter side: a container that maintains an Element tree keyed by targetId.
C++ side: a native engine that stores callbacks in m_eventListenerMap and invokes them via JS_Call.
The following diagram shows the three‑layer structure and the two pipelines.
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