gwennguihal

open class VerticalCollectionViewLayout: UICollectionViewFlowLayout {
    
    unowned fileprivate let collectionViewData: CollectionData

    fileprivate var cachedItemAttributes = [IndexPath:UICollectionViewLayoutAttributes]()
    fileprivate var globalOffset = CGPoint()
    var contentSize = CGSize()
    
    public init(collectionViewData: CollectionData) {
        self.collectionViewData = collectionViewData

gwennguihal

//--- SectionDescriptor

// new propertie
private(set) var verticalSpaces = [Int: VerticalSpace]()

@discardableResult public func reloadSection(_ builderClosure: @escaping BuilderClosure) -> SectionDescriptor {
    let builder = Builder(sectionDescriptor: self)
    builderClosure(builder)
    verticalSpaces = builder.verticalSpaces
    return reloadSection { cells in

gwennguihal

//---- VerticalSpace.swift
public typealias VerticalSpace = CGFloat

public extension CGFloat {
    public static var zero: VerticalSpace = 0
    public static var small: VerticalSpace = 5
    public static var medium: VerticalSpace = 10
    public static var big: VerticalSpace = 20
    public static var huge: VerticalSpace = 40
}

gwennguihal

public typealias BuilderClosure = (Builder) -> Void
    
@discardableResult public func reloadSection(_ builderClosure: @escaping BuilderClosure) -> SectionDescriptor {
    let builder = Builder(sectionDescriptor: self)
    builderClosure(builder)
    return reloadSection { cells in
        cells = builder.cells
    }
}

gwennguihal

import Foundation
import Collor

public class Builder {
    private(set) unowned var sectionDescriptor: CollectionSectionDescribable
    public private(set) var cells = [CollectionCellDescribable]()
    
    public init(sectionDescriptor: CollectionSectionDescribable) {
        self.sectionDescriptor = sectionDescriptor
    }

gwennguihal

import Collor

final class SampleCollectionData: CollorAPI.CollectionData {
    override func reloadData() {
        super.reloadData()
        
        addSection().reloadSection { cells in
            // add cells here
        }
    }

gwennguihal

import Foundation
import Collor

open class CollectionData: Collor.CollectionData {
    
    open override func reloadData() {
        super.reloadData()
    }
    
    public func addSection() -> SectionDescriptor {

gwennguihal

public class SectionDescriptor: CollectionSectionDescribable {
    
    private var lineSpacing = VerticalSpace.zero
    private var horizontalInset: CGFloat = Inset.sectionDefault
    
    public func lineSpacing(_ value: VerticalSpace) -> SectionDescriptor {
        lineSpacing = value
        return self
    }
    

gwennguihal

override func prepare(forCollectionViewUpdates updateItems: [UICollectionViewUpdateItem]) {
    super.prepare(forCollectionViewUpdates: updateItems)
    decorationViewHandler.prepare(forCollectionViewUpdates: updateItems)
}

override func indexPathsToInsertForDecorationView(ofKind elementKind: String) -> [IndexPath] {
    return decorationViewHandler.inserted(for: elementKind)
}

override func indexPathsToDeleteForDecorationView(ofKind elementKind: String) -> [IndexPath] {

gwennguihal

let decorationAttributes = decorationViewHandler.attributes(in:rect)