FragmentPaintPropertyTreeBuilder::UpdateScrollAndScrollTranslation()
Blink28618 Okt 2025

FragmentPaintPropertyTreeBuilder::UpdateScrollAndScrollTranslation()

The provided sources offer an extensive, line-by-line analysis of Blink’s rendering function, FragmentPaintPropertyTreeBuilder::UpdateScrollAndScrollTranslation(), which is critical for implementing scrolling behavior in Chrome. This function manages the creation and updating of two primary data structures: the Scroll Property Node (which defines the logical scroll container, including its viewport, content size, and CSS properties like overscroll behavior and scroll snapping) and the Scroll Translation Transform Node (which applies the negative scroll offset as a geometric translation to descendant content). The process is part of RenderingNG, which uses separate property trees (Transform, Clip, Effect, Scroll) to achieve efficient, incremental updates. The method ensures that only scrollable objects receive these nodes, updates related scrollbar Effect Nodes, and implements optimizations like directly updating the compositor's transform for simple scroll offset changes without rebuilding the entire paint artifact.

Avsnitt(444)

[EXPERT] The PaintLayer Tree in Blink Rendering

[EXPERT] The PaintLayer Tree in Blink Rendering

The provided text explains the PaintLayer tree, an internal architectural component of Google Chrome’s Blink rendering engine that manages complex visual tasks. PaintLayers are selectively created for...

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CSS Sticky Positioning and Paint Property Trees

CSS Sticky Positioning and Paint Property Trees

This documentation details how the Blink rendering engine manages CSS sticky positioning through its PrePaint and paint property tree workflows. During the PrePaint phase, the engine identifies sticky...

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[General] Inside Blink: The Paint Property Tree Builder Pipeline

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Promisify Scroll: Promise-Based Web Scrolling API

The provided text describes a web platform initiative to modernize how browsers handle scrolling by having programmatic scroll methods return JavaScript Promises. Currently, functions like scrollTo() ...

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This text examines how CSS containing blocks function and how the Blink rendering engine implements these rules within Chromium. It explains that a containing block is the essential rectangular refere...

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Axis-Split Sticky Constraints in Chromium Layout and Compositing

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Chromium is refining its rendering engine to support axis-split sticky constraints, allowing elements to stick to different scroll containers for horizontal and vertical movements. Previously, a singl...

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Mastering CSS Sticky Positioning and Scroll Containers

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This documentation provides a comprehensive analysis of CSS sticky positioning, a hybrid layout scheme that anchors elements within their nearest scroll container while maintaining their space in the ...

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