blink::EventHandler (Blink core input handling)
Blink28623 Syys 2025

blink::EventHandler (Blink core input handling)

Scroll chain builder and overscroll chaining logic. Blink’s EventHandler is responsible for building the scroll chain (the sequence of nested scrollable ancestors) when the user scrolls an element . It determines how scroll events propagate up through parent containers and when to terminate the chain. Crucially, it respects the CSS overscroll-behavior of each element to decide if overscroll should propagate or stop at that element. For example, if an inner element is scrolled to its boundary, by default the scroll chains to its parent – but if that element’s style has overscroll-behavior: contain or none, the chain is broken and the overscroll is handled locally . To implement non-root elastic overscroll, one must modify how EventHandler (and associated scroll logic) interprets these style flags and sends overscroll events: instead of always bubbling to the root, it should allow an overscroll at the element itself when appropriate. In short, EventHandler is where the blink style system meets input: it ensures the scroll chain and overscroll-behavior rules are applied, so the developer must understand it to route overscroll to non-root scrollers.

Jaksot(391)

blink::Page → blink::LocalFrame / LocalFrameView

blink::Page → blink::LocalFrame / LocalFrameView

The document’s frame & viewport; LocalFrameView is the scrollable root that triggers layout/paint when needed. provided source outlines the fundamental components of the Blink rendering engine, specif...

21 Syys 202539min

blink::WebViewImpl

blink::WebViewImpl

The source text provides an in-depth explanation of the blink::WebViewImpl class within Chromium's Blink rendering engine, characterizing it as the central control point on the renderer's main thread ...

20 Syys 202539min

cc::LayerTreeHost in Chromium's Compositor

cc::LayerTreeHost in Chromium's Compositor

The source provides an extensive technical explanation of the cc::LayerTreeHost class, which acts as the central main-thread component in the Chromium compositor architecture. It details how this comp...

20 Syys 202537min

cc:: Scheduler / SchedulerStateMachine

cc:: Scheduler / SchedulerStateMachine

Drives the frame loop on the compositor thread (BeginFrame → Animate → Commit → Draw), deciding when to ask Blink for a new frame or to draw with existing state.

20 Syys 202548min

Chrome Interactions Team: Key Class Reference

Chrome Interactions Team: Key Class Reference

The sources provide an extensive reference guide detailing the key classes and infrastructure involved in handling user interactions—specifically scrolling, gestures, and input—within the Blink and Ch...

20 Syys 202553min

Essential Unix, Git, and Development Commands

Essential Unix, Git, and Development Commands

This comprehensive reference document provides an essential overview of commands used in a Unix-like environment, primarily focusing on Linux/macOS command-line operations and the specialized workflow...

20 Syys 202541min

Chromium and Blink Developer Command Reference

Chromium and Blink Developer Command Reference

The collection of sources provides a comprehensive guide to developing within the Chromium project, focusing heavily on command-line tools and workflows essential for engineers, particularly those wor...

19 Syys 202543min

Chrome Interaction Systems: Scrolling, Animations, and Input

Chrome Interaction Systems: Scrolling, Animations, and Input

The source material provides a detailed examination of Chrome’s architecture and how it manages user interactions like scrolling, animations, and input handling to ensure web pages feel smooth and res...

19 Syys 202526min