140 lines
5.1 KiB
Swift
140 lines
5.1 KiB
Swift
//
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// CollectionViewCell.swift
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// MVMCoreUI
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//
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// Created by Scott Pfeil on 4/6/20.
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// Copyright © 2020 Verizon Wireless. All rights reserved.
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//
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import Foundation
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/// A base collection view cell with basic mvm functionality.
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open class CollectionViewCell: UICollectionViewCell, MoleculeViewProtocol, MVMCoreViewProtocol, CollectionTemplateItemProtocol, MFButtonProtocol {
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//--------------------------------------------------
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// MARK: - Properties
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//--------------------------------------------------
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// Convenience helpers
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open var molecule: MoleculeViewProtocol?
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public let containerHelper = ContainerHelper()
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open var model: CollectionItemModelProtocol?
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/// The width, used for establishing columns
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open var width: CGFloat?
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private var initialSetupPerformed = false
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// MARK: - Inits
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public override init(frame: CGRect) {
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super.init(frame: .zero)
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initialSetup()
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}
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public required init?(coder aDecoder: NSCoder) {
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super.init(coder: aDecoder)
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initialSetup()
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}
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private func initialSetup() {
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if !initialSetupPerformed {
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initialSetupPerformed = true
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setupView()
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}
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}
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// MARK: - Helpers
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/// Convenience function. Adds a molecule to the view.
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open func addMolecule(_ molecule: MoleculeViewProtocol) {
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contentView.addSubview(molecule)
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containerHelper.constrainView(molecule)
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self.molecule = molecule
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}
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// MARK: - MVMCoreViewProtocol
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open func setupView() {
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isAccessibilityElement = false
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contentView.isAccessibilityElement = false
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insetsLayoutMarginsFromSafeArea = false
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contentView.insetsLayoutMarginsFromSafeArea = false
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contentView.preservesSuperviewLayoutMargins = false
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MVMCoreUIUtility.setMarginsFor(self, leading: 0, top: 0, trailing: 0, bottom: 0)
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}
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open func updateView(_ size: CGFloat) {
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if let model = model as? ContainerModelProtocol {
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containerHelper.updateViewMargins(contentView, model: model, size: size)
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}
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(molecule as? MVMCoreViewProtocol)?.updateView(size)
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}
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// MARK: - MoleculeViewProtocol
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open func set(with model: MoleculeModelProtocol, _ delegateObject: MVMCoreUIDelegateObject?, _ additionalData: [AnyHashable: Any]?) {
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guard let model = model as? CollectionItemModelProtocol else { return }
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self.model = model
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if let moleculeModel = model as? MoleculeModelProtocol,
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let backgroundColor = moleculeModel.backgroundColor {
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self.backgroundColor = backgroundColor.uiColor
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}
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// align if needed.
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if let model = model as? ContainerModelProtocol {
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containerHelper.set(with: model, for: molecule as? MVMCoreUIViewConstrainingProtocol)
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}
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}
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open func reset() {
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molecule?.reset()
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backgroundColor = .clear
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width = nil
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}
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// MARK: Overridables
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// Base classes need to implement these functions otherwise swift won't respect the subclass functions and use the ones in the protocol extension instead.
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open class func nameForReuse(with model: MoleculeModelProtocol, _ delegateObject: MVMCoreUIDelegateObject?) -> String? {
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return model.moleculeName
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}
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open class func estimatedHeight(with model: MoleculeModelProtocol, _ delegateObject: MVMCoreUIDelegateObject?) -> CGFloat? {
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return nil
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}
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open class func requiredModules(with model: MoleculeModelProtocol, _ delegateObject: MVMCoreUIDelegateObject?, error: AutoreleasingUnsafeMutablePointer<MVMCoreErrorObject?>?) -> [String]? {
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return nil
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}
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//--------------------------------------------------
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// MARK: - CollectionTemplateItemProtocol
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//--------------------------------------------------
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public func set(width: CGFloat) {
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self.width = width
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}
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// MARK: - Override
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open func shouldSelect(at index: IndexPath, delegateObject: MVMCoreUIDelegateObject?, additionalData: [AnyHashable: Any]?) -> Bool {
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if let action = model?.action {
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Button.performButtonAction(with: action, button: self, delegateObject: delegateObject, additionalData: additionalData)
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}
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return true
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}
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open func didSelectCell(at index: IndexPath, delegateObject: MVMCoreUIDelegateObject?, additionalData: [AnyHashable : Any]?) {}
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// Column logic, set width.
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override open func preferredLayoutAttributesFitting(_ layoutAttributes: UICollectionViewLayoutAttributes) -> UICollectionViewLayoutAttributes {
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let autoLayoutAttributes = super.preferredLayoutAttributesFitting(layoutAttributes)
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guard let width = width else { return autoLayoutAttributes }
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let targetSize = CGSize(width: width, height: 0)
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let newSize = contentView.systemLayoutSizeFitting(targetSize, withHorizontalFittingPriority: .required, verticalFittingPriority: .defaultLow)
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let newFrame = CGRect(origin: autoLayoutAttributes.frame.origin, size: newSize)
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autoLayoutAttributes.frame = newFrame
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return autoLayoutAttributes
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}
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}
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