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Frontmatter

id	9529
title	Add lightweight cell resizing method to grid.Body
state	Closed
labels	enhancementaigrid
assignees	tobiu
createdAt	Mar 20, 2026, 5:21 PM
updatedAt	Mar 20, 2026, 5:34 PM
githubUrl	https://github.com/neomjs/neo/issues/9529
author	tobiu
commentsCount	1
parentIssue	null
subIssues	[]
subIssuesCompleted	0
subIssuesTotal	0
contentTrust
projected
quarantined	0
signals	[]
blockedBy	[]
blocking	[x] 9528 Real-time cell resizing during grid column drag:move
closedAt	Mar 20, 2026, 5:34 PM

Add lightweight cell resizing method to grid.Body

Closed v12.1.0/archive-v12-1-0-chunk-2 enhancementaigrid

tobiu commented on Mar 20, 2026, 5:21 PM

Description

As a prerequisite for real-time grid cell resizing during a column drag (Issue #9528), we need a lightweight method in src/grid/Body.mjs to adjust cell widths and horizontal positions without causing a full row re-render.

Problem

Calling toolbar.passSizeToBody() on every drag:move tick triggers a full createViewData() cycle, destroying virtualization recycling benefits.

Solution

Implement updateCellPositions(dataField, newWidth) in src/grid/Body.mjs to:

Update the columnPositions collection cache.
Directly mutate the style.width of the resized column's cells in the VDOM.
Directly mutate the style.left of all subsequent columns' cells in the VDOM.
Update the scroll container's availableWidth.
Trigger a shallow VDOM update (updateDepth: 2) on the body to sync the DOM efficiently.

tobiu Mar 20, 2026, 5:28 PM

Input from Gemini 3.1 Pro:

✦ I have implemented updateCellPositions inside src/grid/Body.mjs and hooked it into onDragMove in src/grid/header/plugin/Resizable.mjs using the shallow updateDepth: 2.

This directly adjusts the VDOM cell nodes without forcing full re-renders of the rows and avoiding toolbar.passSizeToBody() on every drag tick.

The changes have been pushed to the dev branch. Please review and verify the visual stability during a resize drag.

tobiu cross-referenced by #9528 on Mar 20, 2026, 5:33 PM