fix(for-of): call recalcUpdateSizes via afterNextRender in zoneless mode - 21.2.x#17326
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viktorkombov wants to merge 3 commits into
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fix(for-of): call recalcUpdateSizes via afterNextRender in zoneless mode - 21.2.x#17326viktorkombov wants to merge 3 commits into
viktorkombov wants to merge 3 commits into
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Pull request overview
Fixes a virtualization sizing regression when running Ignite UI grids under zoneless Angular change detection, where NgZone.onStable never fires and the virtual size cache is left stale after scrolling (leading to clipped last visible rows).
Changes:
- Update
IgxForOfDirectivescroll handlers to detect zoneless mode and schedulerecalcUpdateSizes()viaafterNextRender(...)instead ofNgZone.onStable. - Update
IgxGridBaseDirectiveresize notification handling to avoidzone.run(...)in zoneless mode. - Add a unit test covering zoneless scrolling behavior to ensure
recalcUpdateSizes()is invoked.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| projects/igniteui-angular/grids/grid/src/grid-base.directive.ts | Avoids zone.run() in zoneless mode for resize notifications while keeping zone-based behavior unchanged. |
| projects/igniteui-angular/directives/src/directives/for-of/for_of.directive.ts | Ensures recalcUpdateSizes() is scheduled after render in zoneless mode across relevant scroll handlers. |
| projects/igniteui-angular/directives/src/directives/for-of/for_of.directive.spec.ts | Adds zoneless test coverage validating recalcUpdateSizes() is called after vertical scroll. |
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Closes #17280
Description
In zoneless Angular (
provideZonelessChangeDetection),NoopNgZone.onStablenever emits, sorecalcUpdateSizes()was never called after scrolling. This left the virtual scroll size cache uncorrected, causing the last visible row in MRL grids to appear partially clipped.Motivation / Context
In
for_of.directive.ts, at all three scroll handler sites, detect zoneless mode and useafterNextRender({ read: () => recalcUpdateSizes() })instead ofzone.onStable.pipe(first()).subscribe(recalcUpdateSizes). Zone mode keeps the original path unchanged (replacing it unconditionally breaks an existing zone-based scroll test).In
grid-base.directive.ts, the resizeNotify handler skips zone.run() in zoneless mode -notifyChanges()already callsmarkForCheck()which schedules CD via the zoneless scheduler.Type of Change (check all that apply):
Component(s) / Area(s) Affected:
Grid, For-of
How Has This Been Tested?
Added a zoneless describe block in
for_of.directive.spec.tsverifyingrecalcUpdateSizesis called after scroll when usingprovideZonelessChangeDetection.Test Configuration:
Screenshots / Recordings
Checklist:
feature/README.MDupdates for the feature docsREADME.MDCHANGELOG.MDupdates for newly added functionalityng updatemigrations for the breaking changes (migrations guidelines)