CollorAPI.DecorationBlock.swift

public final class DecorationBlock {
    
    public let type: DecorationBlockType
    
    unowned var sectionDescriptor: CollectionSectionDescribable
    var startItemIndex: Int
    var endItemIndex: Int
    
    var firstIndexPath: IndexPath? {
        guard let sectionIndex = sectionDescriptor.index else {
            return nil
        }
        return IndexPath(item: startItemIndex, section: sectionIndex)
    }
    
    var endIndexPath: IndexPath? {
        guard let sectionIndex = sectionDescriptor.index else {
            return nil
        }
        return IndexPath(item: endItemIndex, section: sectionIndex)
    }
    
    init(type: DecorationBlockType, startItemIndex: Int, sectionDescriptor: CollectionSectionDescribable) {
        self.type = type
        self.startItemIndex = startItemIndex
        self.endItemIndex = startItemIndex
        self.sectionDescriptor = sectionDescriptor
    }
}