237 lines
11 KiB
Swift
237 lines
11 KiB
Swift
//
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// Stack.swift
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// MVMCoreUI
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//
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// Created by Scott Pfeil on 1/16/20.
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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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open class Stack<T>: Container where T: StackModelProtocol {
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var contentView: UIView = MVMCoreUICommonViewsUtility.commonView()
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var stackModel: T? {
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get { return model as? T }
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}
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var stackItems: [UIView] = []
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// MARK: - Helpers
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public func pinView(_ view: UIView, toView: UIView, attribute: NSLayoutConstraint.Attribute, relation: NSLayoutConstraint.Relation, priority: UILayoutPriority, constant: CGFloat) {
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let constraint = NSLayoutConstraint(item: view, attribute: attribute, relatedBy: relation, toItem: toView, attribute: attribute, multiplier: 1.0, constant: constant)
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constraint.priority = priority
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constraint.isActive = true
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}
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/// Restacks the existing items.
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func restack() {
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removeAllItemViews()
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guard let stackModel = stackModel else { return }
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let stackItems = self.stackItems
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self.stackItems = []
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let lastItemIndex = stackModel.molecules.lastIndex(where: { (item) -> Bool in
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return !item.gone
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})
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for (index, view) in stackItems.enumerated() {
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addView(view, stackModel.molecules[index], lastItem: lastItemIndex == index)
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}
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}
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/// Removes all stack items views from the view.
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func removeAllItemViews() {
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for item in stackItems {
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item.removeFromSuperview()
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}
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}
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// MARK: - Inits
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public override init(frame: CGRect) {
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super.init(frame: frame)
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}
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public init(withJSON json: [AnyHashable: Any]?, delegateObject: MVMCoreUIDelegateObject?, additionalData: [AnyHashable : Any]?) {
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super.init(frame: CGRect.zero)
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setWithJSON(json, delegateObject: delegateObject, additionalData: additionalData)
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}
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public required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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// MARK: - MFViewProtocol
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public override func setupView() {
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super.setupView()
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guard contentView.superview == nil else {
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return
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}
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MVMCoreUIUtility.setMarginsFor(contentView, leading: 0, top: 0, trailing: 0, bottom: 0)
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translatesAutoresizingMaskIntoConstraints = false
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backgroundColor = .clear
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addSubview(contentView)
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containerHelper.constrainView(contentView)
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contentView.setContentHuggingPriority(.defaultHigh, for: .vertical)
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contentView.setContentHuggingPriority(.defaultHigh, for: .horizontal)
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}
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public override func updateView(_ size: CGFloat) {
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super.updateView(size)
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for item in stackItems {
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(item as? MVMCoreViewProtocol)?.updateView(size)
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}
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}
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// MARK: - MVMCoreUIMoleculeViewProtocol
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public override func reset() {
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super.reset()
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backgroundColor = .clear
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for item in stackItems {
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(item as? MoleculeViewProtocol)?.reset?()
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}
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}
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public override func setWithModel(_ model: MoleculeProtocol?, _ delegateObject: MVMCoreUIDelegateObject?, _ additionalData: [AnyHashable : Any]?) {
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let previousModel = self.model
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super.setWithModel(model, delegateObject, additionalData)
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removeAllItemViews()
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// If the items in the stack are different, clear them, create new ones.
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if (previousModel == nil) || Self.nameForReuse(previousModel, delegateObject) != Self.nameForReuse(model, delegateObject) {
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stackItems = []
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createStackItemsFromModel(model, delegateObject, additionalData)
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} else {
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setStackItemsFromModel(model, delegateObject, additionalData)
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}
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restack()
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}
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public override class func nameForReuse(_ model: MoleculeProtocol?, _ delegateObject: MVMCoreUIDelegateObject?) -> String? {
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// This will aggregate names of molecules to make an id.
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guard let model = model as? T else {
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return "stack<>"
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}
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var name = "stack<"
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for case let item in model.molecules {
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if let moleculeName = item.moleculeName {
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if let moleculeClass = MVMCoreUIMoleculeMappingObject.shared()?.moleculeMapping[moleculeName] as? ModelMoleculeViewProtocol.Type,
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let nameForReuse = moleculeClass.nameForReuse(item, delegateObject) {
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name.append(nameForReuse + ",")
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} else {
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name.append(moleculeName + ",")
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}
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}
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}
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name.append(">")
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return name
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}
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// Need to update to take into account first spacing flag
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public override class func estimatedHeight(forRow molecule: MoleculeProtocol?, delegateObject: MVMCoreUIDelegateObject?) -> CGFloat? {
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guard let model = molecule as? T else { return 0 }
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let horizontal = model.axis == .horizontal
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var estimatedHeight: CGFloat = 0
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for case let item in model.molecules {
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if item.gone { continue }
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let height = (MVMCoreUIMoleculeMappingObject.shared()?.getMoleculeClass(item) as? ModelMoleculeViewProtocol.Type)?.estimatedHeight(forRow: item, delegateObject: delegateObject) ?? 0
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if !horizontal {
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// Vertical stack aggregates the items
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let spacing = item.spacing ?? model.spacing
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estimatedHeight += (height + spacing)
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} else {
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// Horizontal stack takes the tallest item.
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estimatedHeight = max(estimatedHeight, height)
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}
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}
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return estimatedHeight
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}
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public override class func requiredModules(_ molecule: MoleculeProtocol?, delegateObject: MVMCoreUIDelegateObject?, error: AutoreleasingUnsafeMutablePointer<MVMCoreErrorObject?>?) -> [String]? {
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guard let model = molecule as? T else { return nil }
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var modules: [String] = []
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for case let item in model.molecules {
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if let modulesForMolecule = (MVMCoreUIMoleculeMappingObject.shared()?.getMoleculeClass(item) as? ModelMoleculeViewProtocol.Type)?.requiredModules(item, delegateObject: delegateObject, error: error) {
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modules += modulesForMolecule
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}
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}
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return modules.count > 0 ? modules : nil
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}
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// MARK: - Subclassables
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/// Can be subclassed to create views when we get stack item models and have no views yet
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func createStackItemsFromModel(_ model: MoleculeProtocol?, _ delegateObject: MVMCoreUIDelegateObject?, _ additionalData: [AnyHashable : Any]?) {
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}
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/// Can be subclassed to set stack items with model when we already have views
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func setStackItemsFromModel(_ model: MoleculeProtocol?, _ delegateObject: MVMCoreUIDelegateObject?, _ additionalData: [AnyHashable : Any]?) {
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guard let models = stackModel?.molecules else { return }
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for (index, element) in models.enumerated() {
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(stackItems[index] as? ModelMoleculeViewProtocol)?.setWithModel(element, delegateObject, additionalData)
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}
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}
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// MARK: - Adding to stack
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/// Convenience function, adds a view to a StackItem to the Stack
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func addViewToItemToStack(_ view: UIView, lastItem: Bool) {
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let stackItemModel = StackItemModel()
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let stackItem = StackItem(andContain: view)
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addView(stackItem, stackItemModel, lastItem: lastItem)
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}
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/// Adds the stack item view
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func addView(_ view: UIView,_ model: StackItemModelProtocol, lastItem: Bool) {
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guard let stackModel = self.stackModel else { return }
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guard !model.gone else {
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// Gone views do not show
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stackItems.append(view)
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return
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}
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contentView.addSubview(view)
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view.translatesAutoresizingMaskIntoConstraints = false
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let spacing = model.spacing ?? stackModel.spacing
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if let container = view as? ContainerProtocol {
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let verticalAlignment = (model as? ContainerModelProtocol)?.verticalAlignment ?? (container.view as? MVMCoreUIViewConstrainingProtocol)?.verticalAlignment?() ?? (model.percent == nil && stackModel.axis == .vertical ? .fill : (stackModel.axis == .vertical ? .leading : .center))
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let horizontalAlignment = (model as? ContainerModelProtocol)?.horizontalAlignment ?? (container.view as? MVMCoreUIViewConstrainingProtocol)?.horizontalAlignment?() ?? (stackModel.axis == .vertical || model.percent == nil ? .fill : .leading)
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container.alignHorizontal(horizontalAlignment)
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container.alignVertical(verticalAlignment)
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}
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let first = contentView.subviews.count == 1
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if stackModel.axis == .vertical {
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if first {
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pinView(view, toView: contentView, attribute: .top, relation: .equal, priority: .required, constant: stackModel.useStackSpacingBeforeFirstItem ? spacing : model.spacing ?? 0)
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} else if let previousView = stackItems.last(where: { item in
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return !model.gone
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}) {
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view.topAnchor.constraint(equalTo: previousView.bottomAnchor, constant: spacing).isActive = true
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}
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pinView(view, toView: contentView, attribute: .leading, relation: .equal, priority: .required, constant: 0)
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pinView(contentView, toView: view, attribute: .trailing, relation: .equal, priority: .required, constant: 0)
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if let percent = model.percent {
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view.heightAnchor.constraint(equalTo: contentView.heightAnchor, multiplier: CGFloat(percent)/100.0).isActive = true
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}
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if lastItem {
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pinView(contentView, toView: view, attribute: .bottom, relation: .equal, priority: .required, constant: 0)
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}
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} else {
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if first {
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// First horizontal item has no spacing by default unless told otherwise.
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pinView(view, toView: contentView, attribute: .leading, relation: .equal, priority: .required, constant: stackModel.useStackSpacingBeforeFirstItem ? spacing : model.spacing ?? 0)
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} else if let previousView = stackItems.last(where: { item in
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return !model.gone
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}) {
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view.leftAnchor.constraint(equalTo: previousView.rightAnchor, constant: spacing).isActive = true
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}
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pinView(view, toView: contentView, attribute: .top, relation: .equal, priority: .required, constant: 0)
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pinView(contentView, toView: view, attribute: .bottom, relation: .equal, priority: .required, constant: 0)
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if let percent = model.percent {
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view.widthAnchor.constraint(equalTo: contentView.widthAnchor, multiplier: CGFloat(percent)/100.0).isActive = true
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}
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if lastItem {
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pinView(contentView, toView: view, attribute: .right, relation: .equal, priority: .required, constant: 0)
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}
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}
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stackItems.append(view)
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}
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}
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