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Add delegate method for minimumColumnSpacing #208

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Add delegate method for minimumColumnSpacing #208

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13 changes: 10 additions & 3 deletions Source/CHTCollectionViewWaterfallLayout.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,10 @@ private func > <T: Comparable>(lhs: T?, rhs: T?) -> Bool {
@objc optional func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
columnCountFor section: Int) -> Int

@objc optional func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
minimumColumnSpacingFor section: Int) -> CGFloat

@available(*, unavailable, renamed: "collectionView(_:layout:sizeForItemAt:)")
@objc optional func collectionView (_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout,
Expand Down Expand Up @@ -205,10 +209,13 @@ public class CHTCollectionViewWaterfallLayout: UICollectionViewLayout {
}

public func itemWidth(inSection section: Int) -> CGFloat {
let columnCount = self.columnCount(forSection: section)
let spaceColumCount = CGFloat(columnCount - 1)
let width = collectionViewContentWidth(ofSection: section)
return floor((width - (spaceColumCount * minimumColumnSpacing)) / CGFloat(columnCount))

let columnCount = self.columnCount(forSection: section)
let spaceColumnCount = CGFloat(columnCount - 1)
let columnSpacing = delegate?.collectionView?(collectionView!, layout: self, minimumColumnSpacingFor: section) ?? minimumColumnSpacing

return floor((width - (spaceColumnCount * columnSpacing)) / CGFloat(columnCount))
}

override public func prepare() {
Expand Down