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Add flag to test reducing unnecessary layout invalidations #156

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Merged
bryankeller merged 1 commit into from
May 12, 2026
Merged

Add flag to test reducing unnecessary layout invalidations #156

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13 changes: 10 additions & 3 deletions MagazineLayout/Public/MagazineLayoutInvalidationContext.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -20,8 +20,15 @@ import UIKit
/// Used to indicate that collection view properties and/or delegate layout metrics changed.
public final class MagazineLayoutInvalidationContext: UICollectionViewLayoutInvalidationContext {

/// Indicates whether to recompute the positions and sizes of elements based on the current
/// collection view and delegate layout metrics.
public var invalidateLayoutMetrics = true
/// A temporary flag to enable safely testing a change to how layout invalidation works.
public static var _invalidateLayoutMetricsDefaultValue = true

/// Indicates whether to recompute the positions and sizes of elements based on the current collection view and delegate layout
/// metrics.
///
/// Defaults to `false`. Set to `true` when delegate-provided layout values (e.g. item size
/// modes, header/footer visibility, section metrics) have changed and the layout needs to
/// re-query the delegate.
public var invalidateLayoutMetrics = _invalidateLayoutMetricsDefaultValue

}
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