cc::LayerTreeHostImpl (Input Handler & Scroll Logic)
Blink28623 Sep 2025

cc::LayerTreeHostImpl (Input Handler & Scroll Logic)

Scroll processing and overscroll detection in the compositor. The LayerTreeHostImpl in cc implements the compositor-thread InputHandler that processes gesture scroll updates and flings. It manages the scroll state of all scroll nodes (via the ScrollTree) and determines when a scroll has hit the extent of an element. Currently, this is where overscroll is detected and reported – but only for the root/viewport. For example, the InputHandler sets did_overscroll_root in the scroll result when the root scroll node reaches its boundary , triggering the elastic effect on the root. To support elastic overscroll on non-root elements, this logic in LayerTreeHostImpl (and its ScrollTree/ScrollNode handling) needs to be generalized: it must detect overscroll on any scrollable node and initiate the overscroll animation (via the helper/controller) for that node instead of chaining upward. Understanding LayerTreeHostImpl and how it yields overscroll information (e.g. populating InputHandlerScrollResult.unused_scroll_delta, accumulated overscroll, and overscroll_behavior flags ) is key, as changes here will route overscroll into the ElasticOverscrollController for the right element rather than exclusively the root.

Avsnitt(448)

Simple Versus Easy in Programming

Simple Versus Easy in Programming

provided sources center on Rich Hickey's "Simple Made Easy" talk, which meticulously distinguishes between simple (objective, meaning "one-fold" or unentangled) and easy (subjective, meaning "near-at-...

16 Okt 202534min

CSS Keywords and Blink Rendering Engine

CSS Keywords and Blink Rendering Engine

These sources provide a detailed technical history of CSS keywords and features, tracing their evolution from the foundational CSS1 (1996), which introduced the box model and basic typography, through...

16 Okt 202553min

View Transitions

View Transitions

View transitions

16 Okt 202528min

CSS Backdrop-Filter

CSS Backdrop-Filter

The sources provide an extensive technical explanation of the CSS backdrop-filter property within Google Chrome's Blink rendering engine. This deep dive details how the feature, which allows filters l...

16 Okt 202524min

Intersection Observer

Intersection Observer

The sources provide an in-depth explanation of the Intersection Observer API within the Blink rendering engine, focusing on its architecture and implementation to improve web performance. The initial ...

16 Okt 202544min

Chrome Compositor Animation Architecture (cc)

Chrome Compositor Animation Architecture (cc)

The sources provide an extensive architectural overview of the Chrome Compositor Animation (cc) subsystem, which is responsible for executing visual animations like transforms and opacity changes effi...

15 Okt 202541min

Blink's Graph Data Structures and Traversals

Blink's Graph Data Structures and Traversals

The text provides an extensive overview of the graph-structured data structures used within Blink, Chromium's rendering engine, detailing how web content is processed from initial input to final displ...

13 Okt 202539min

blink::PropertyTreeManager

blink::PropertyTreeManager

bridges Blink property trees → cc property trees. Given Blink’s Transform/Clip/Effect/Scroll nodes (from paint property trees), this class creates/updates the cc counterparts (cc::TransformNode, cc::C...

10 Okt 202546min

Populärt inom Teknik

uppgang-och-fall
bilar-med-sladd
market-makers
elbilsveckan
rss-elektrikerpodden
rss-veckans-ai
skogsforum-podcast
rss-technokratin
developers-mer-an-bara-kod
har-vi-akt-till-mars-an
rss-laddstationen-med-elbilen-i-sverige
natets-morka-sida
bli-saker-podden
rss-uppgang-och-fall
rss-it-sakerhetspodden
garagehang
ai-sweden-podcast
rss-powerboat-sverige-podcast
gubbar-som-tjotar-om-bilar
rss-fabriken-2