2024-07-24 01:56:34 +08:00

812 lines
34 KiB
Swift

import Foundation
import UIKit
import Display
import AsyncDisplayKit
import SwiftSignalKit
import Postbox
import TelegramCore
import TelegramPresentationData
import TelegramUIPreferences
import PresentationDataUtils
import AccountContext
import ComponentFlow
import ViewControllerComponent
import MergeLists
import ComponentDisplayAdapters
import ItemListPeerItem
import ItemListUI
import ChatListHeaderComponent
import PlainButtonComponent
import MultilineTextComponent
import SearchBarNode
import BalancedTextComponent
import ChatListSearchItemHeader
final class MiniAppListScreenComponent: Component {
typealias EnvironmentType = ViewControllerComponentContainer.Environment
let context: AccountContext
let initialData: MiniAppListScreen.InitialData
init(
context: AccountContext,
initialData: MiniAppListScreen.InitialData
) {
self.context = context
self.initialData = initialData
}
static func ==(lhs: MiniAppListScreenComponent, rhs: MiniAppListScreenComponent) -> Bool {
if lhs.context !== rhs.context {
return false
}
return true
}
private enum ContentEntry: Comparable, Identifiable {
enum Id: Hashable {
case item(EnginePeer.Id)
}
var stableId: Id {
switch self {
case let .item(peer, _):
return .item(peer.id)
}
}
case item(peer: EnginePeer, sortIndex: Int)
static func <(lhs: ContentEntry, rhs: ContentEntry) -> Bool {
switch lhs {
case let .item(lhsPeer, lhsSortIndex):
switch rhs {
case let .item(rhsPeer, rhsSortIndex):
if lhsSortIndex != rhsSortIndex {
return lhsSortIndex < rhsSortIndex
}
return lhsPeer.id < rhsPeer.id
}
}
}
func item(listNode: ContentListNode) -> ListViewItem {
switch self {
case let .item(peer, _):
let text: ItemListPeerItemText
if case let .user(user) = peer, let subscriberCount = user.subscriberCount {
text = .text(listNode.presentationData.strings.Conversation_StatusBotSubscribers(subscriberCount), .secondary)
} else {
text = .none
}
return ItemListPeerItem(
presentationData: ItemListPresentationData(listNode.presentationData),
dateTimeFormat: listNode.presentationData.dateTimeFormat,
nameDisplayOrder: listNode.presentationData.nameDisplayOrder,
context: listNode.context,
peer: peer,
presence: nil,
text: text,
label: .none,
editing: ItemListPeerItemEditing(editable: false, editing: false, revealed: nil),
enabled: true,
selectable: true,
sectionId: 0,
action: { [weak listNode] in
guard let listNode else {
return
}
if let view = listNode.parentView {
view.openItem(peer: peer)
}
},
setPeerIdWithRevealedOptions: { _, _ in
},
removePeer: { _ in
},
noInsets: true,
header: nil
)
}
}
}
private final class ContentListNode: ListView {
weak var parentView: View?
let context: AccountContext
var presentationData: PresentationData
private var currentEntries: [ContentEntry] = []
private var originalEntries: [ContentEntry] = []
init(parentView: View, context: AccountContext) {
self.parentView = parentView
self.context = context
self.presentationData = context.sharedContext.currentPresentationData.with({ $0 })
super.init()
}
func update(size: CGSize, insets: UIEdgeInsets, transition: ComponentTransition) {
let (listViewDuration, listViewCurve) = listViewAnimationDurationAndCurve(transition: transition.containedViewLayoutTransition)
self.transaction(
deleteIndices: [],
insertIndicesAndItems: [],
updateIndicesAndItems: [],
options: [.Synchronous, .LowLatency, .PreferSynchronousResourceLoading],
additionalScrollDistance: 0.0,
updateSizeAndInsets: ListViewUpdateSizeAndInsets(size: size, insets: insets, duration: listViewDuration, curve: listViewCurve),
updateOpaqueState: nil
)
}
func setEntries(entries: [ContentEntry], animated: Bool) {
self.originalEntries = entries
let entries = entries
let (deleteIndices, indicesAndItems, updateIndices) = mergeListsStableWithUpdates(leftList: self.currentEntries, rightList: entries)
self.currentEntries = entries
let deletions = deleteIndices.map { ListViewDeleteItem(index: $0, directionHint: nil) }
let insertions = indicesAndItems.map { ListViewInsertItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(listNode: self), directionHint: nil) }
let updates = updateIndices.map { ListViewUpdateItem(index: $0.0, previousIndex: $0.2, item: $0.1.item(listNode: self), directionHint: nil) }
var options: ListViewDeleteAndInsertOptions = [.Synchronous, .LowLatency]
if animated {
options.insert(.AnimateInsertion)
} else {
options.insert(.PreferSynchronousResourceLoading)
}
self.transaction(
deleteIndices: deletions,
insertIndicesAndItems: insertions,
updateIndicesAndItems: updates,
options: options,
scrollToItem: nil,
stationaryItemRange: nil,
updateOpaqueState: nil,
completion: { _ in
}
)
}
}
final class View: UIView {
private var contentListNode: ContentListNode?
private var ignoreVisibleContentOffsetChanged: Bool = false
private var emptySearchState: ComponentView<Empty>?
private let navigationBarView = ComponentView<Empty>()
private var navigationHeight: CGFloat?
private let sectionHeader = ComponentView<Empty>()
private var searchBarNode: SearchBarNode?
private var isUpdating: Bool = false
private var component: MiniAppListScreenComponent?
private(set) weak var state: EmptyComponentState?
private var environment: EnvironmentType?
private var recommendedAppPeers: [EnginePeer]?
private var recommendedAppPeersDisposable: Disposable?
private var keepUpdatedDisposable: Disposable?
private var isSearchDisplayControllerActive: Bool = false
private var searchQuery: String = ""
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
deinit {
self.recommendedAppPeersDisposable?.dispose()
self.keepUpdatedDisposable?.dispose()
}
func scrollToTop() {
}
func attemptNavigation(complete: @escaping () -> Void) -> Bool {
return true
}
func openItem(peer: EnginePeer) {
guard let component = self.component else {
return
}
guard let environment = self.environment, let controller = environment.controller() else {
return
}
if let peerInfoScreen = component.context.sharedContext.makePeerInfoController(context: component.context, updatedPresentationData: nil, peer: peer._asPeer(), mode: .generic, avatarInitiallyExpanded: false, fromChat: false, requestsContext: nil) {
peerInfoScreen.navigationPresentation = .modal
controller.push(peerInfoScreen)
}
}
private func updateNavigationBar(
component: MiniAppListScreenComponent,
theme: PresentationTheme,
strings: PresentationStrings,
size: CGSize,
insets: UIEdgeInsets,
statusBarHeight: CGFloat,
isModal: Bool,
transition: ComponentTransition,
deferScrollApplication: Bool
) -> CGFloat {
let rightButtons: [AnyComponentWithIdentity<NavigationButtonComponentEnvironment>] = []
//TODO:localize
let titleText: String = "Examples"
let closeTitle: String = strings.Common_Close
let headerContent: ChatListHeaderComponent.Content? = ChatListHeaderComponent.Content(
title: titleText,
navigationBackTitle: nil,
titleComponent: nil,
chatListTitle: nil,
leftButton: isModal ? AnyComponentWithIdentity(id: "close", component: AnyComponent(NavigationButtonComponent(
content: .text(title: closeTitle, isBold: false),
pressed: { [weak self] _ in
guard let self else {
return
}
if self.attemptNavigation(complete: {}) {
self.environment?.controller()?.dismiss()
}
}
))) : nil,
rightButtons: rightButtons,
backTitle: isModal ? nil : strings.Common_Back,
backPressed: { [weak self] in
guard let self else {
return
}
if self.attemptNavigation(complete: {}) {
self.environment?.controller()?.dismiss()
}
}
)
let navigationBarSize = self.navigationBarView.update(
transition: transition,
component: AnyComponent(ChatListNavigationBar(
context: component.context,
theme: theme,
strings: strings,
statusBarHeight: statusBarHeight,
sideInset: insets.left,
isSearchActive: self.isSearchDisplayControllerActive,
isSearchEnabled: true,
primaryContent: headerContent,
secondaryContent: nil,
secondaryTransition: 0.0,
storySubscriptions: nil,
storiesIncludeHidden: false,
uploadProgress: [:],
tabsNode: nil,
tabsNodeIsSearch: false,
accessoryPanelContainer: nil,
accessoryPanelContainerHeight: 0.0,
activateSearch: { [weak self] _ in
guard let self else {
return
}
self.isSearchDisplayControllerActive = true
self.state?.updated(transition: .spring(duration: 0.4))
},
openStatusSetup: { _ in
},
allowAutomaticOrder: {
}
)),
environment: {},
containerSize: size
)
//TODO:localize
let sectionHeaderSize = self.sectionHeader.update(
transition: transition,
component: AnyComponent(ListHeaderComponent(
theme: theme,
title: "APPS THAT ACCEPT STARS"
)),
environment: {},
containerSize: CGSize(width: size.width, height: 1000.0)
)
if let sectionHeaderView = self.sectionHeader.view {
if sectionHeaderView.superview == nil {
sectionHeaderView.layer.anchorPoint = CGPoint()
self.addSubview(sectionHeaderView)
}
transition.setBounds(view: sectionHeaderView, bounds: CGRect(origin: CGPoint(), size: sectionHeaderSize))
}
if let navigationBarComponentView = self.navigationBarView.view as? ChatListNavigationBar.View {
if deferScrollApplication {
navigationBarComponentView.deferScrollApplication = true
}
if navigationBarComponentView.superview == nil {
self.addSubview(navigationBarComponentView)
}
transition.setFrame(view: navigationBarComponentView, frame: CGRect(origin: CGPoint(), size: navigationBarSize))
return navigationBarSize.height
} else {
return 0.0
}
}
private func updateNavigationScrolling(navigationHeight: CGFloat, transition: ComponentTransition) {
var mainOffset: CGFloat
if let recommendedAppPeers = self.recommendedAppPeers, !recommendedAppPeers.isEmpty {
if let contentListNode = self.contentListNode {
switch contentListNode.visibleContentOffset() {
case .none:
mainOffset = 0.0
case .unknown:
mainOffset = navigationHeight
case let .known(value):
mainOffset = value
}
} else {
mainOffset = navigationHeight
}
} else {
mainOffset = navigationHeight
}
mainOffset = min(mainOffset, ChatListNavigationBar.searchScrollHeight)
if abs(mainOffset) < 0.1 {
mainOffset = 0.0
}
let resultingOffset = mainOffset
var offset = resultingOffset
if self.isSearchDisplayControllerActive {
offset = 0.0
}
if let sectionHeaderView = self.sectionHeader.view {
transition.setPosition(view: sectionHeaderView, position: CGPoint(x: 0.0, y: navigationHeight - offset))
}
if let navigationBarComponentView = self.navigationBarView.view as? ChatListNavigationBar.View {
navigationBarComponentView.applyScroll(offset: offset, allowAvatarsExpansion: false, forceUpdate: false, transition: transition.withUserData(ChatListNavigationBar.AnimationHint(
disableStoriesAnimations: false,
crossfadeStoryPeers: false
)))
}
}
func update(component: MiniAppListScreenComponent, availableSize: CGSize, state: EmptyComponentState, environment: Environment<EnvironmentType>, transition: ComponentTransition) -> CGSize {
self.isUpdating = true
defer {
self.isUpdating = false
}
if self.component == nil {
self.recommendedAppPeers = component.initialData.recommendedAppPeers
/*self.shortcutMessageListDisposable = (component.context.engine.accountData.shortcutMessageList(onlyRemote: false)
|> deliverOnMainQueue).startStrict(next: { [weak self] shortcutMessageList in
guard let self else {
return
}
self.shortcutMessageList = shortcutMessageList
if !self.isUpdating {
self.state?.updated(transition: .immediate)
}
})*/
self.keepUpdatedDisposable = component.context.engine.peers.requestRecommendedAppsIfNeeded().startStrict()
}
let environment = environment[EnvironmentType.self].value
let themeUpdated = self.environment?.theme !== environment.theme
self.environment = environment
self.component = component
self.state = state
if themeUpdated {
self.backgroundColor = environment.theme.list.plainBackgroundColor
}
var isModal = false
if let controller = environment.controller(), controller.navigationPresentation == .modal {
isModal = true
}
var statusBarHeight = environment.statusBarHeight
if isModal {
statusBarHeight = max(statusBarHeight, 1.0)
}
let listBottomInset = environment.safeInsets.bottom + environment.additionalInsets.bottom
let navigationHeight = self.updateNavigationBar(
component: component,
theme: environment.theme,
strings: environment.strings,
size: availableSize,
insets: environment.safeInsets,
statusBarHeight: statusBarHeight,
isModal: isModal,
transition: transition,
deferScrollApplication: true
)
self.navigationHeight = navigationHeight
var removedSearchBar: SearchBarNode?
if self.isSearchDisplayControllerActive {
let searchBarNode: SearchBarNode
var searchBarTransition = transition
if let current = self.searchBarNode {
searchBarNode = current
} else {
searchBarTransition = .immediate
let searchBarTheme = SearchBarNodeTheme(theme: environment.theme, hasSeparator: false)
searchBarNode = SearchBarNode(
theme: searchBarTheme,
strings: environment.strings,
fieldStyle: .modern,
displayBackground: false
)
searchBarNode.placeholderString = NSAttributedString(string: environment.strings.Common_Search, font: Font.regular(17.0), textColor: searchBarTheme.placeholder)
self.searchBarNode = searchBarNode
searchBarNode.cancel = { [weak self] in
guard let self else {
return
}
self.isSearchDisplayControllerActive = false
self.state?.updated(transition: .spring(duration: 0.4))
}
searchBarNode.textUpdated = { [weak self] query, _ in
guard let self else {
return
}
if self.searchQuery != query {
self.searchQuery = query.lowercased().trimmingCharacters(in: .whitespacesAndNewlines)
self.state?.updated(transition: .immediate)
}
}
DispatchQueue.main.async { [weak self, weak searchBarNode] in
guard let self, let searchBarNode, self.searchBarNode === searchBarNode else {
return
}
searchBarNode.activate()
}
}
var searchBarFrame = CGRect(origin: CGPoint(x: 0.0, y: navigationHeight - 54.0 + 2.0), size: CGSize(width: availableSize.width, height: 54.0))
if isModal {
searchBarFrame.origin.y += 2.0
}
searchBarNode.updateLayout(boundingSize: searchBarFrame.size, leftInset: environment.safeInsets.left + 6.0, rightInset: environment.safeInsets.right, transition: searchBarTransition.containedViewLayoutTransition)
searchBarTransition.setFrame(view: searchBarNode.view, frame: searchBarFrame)
if searchBarNode.view.superview == nil {
self.addSubview(searchBarNode.view)
if case let .curve(duration, curve) = transition.animation, let navigationBarView = self.navigationBarView.view as? ChatListNavigationBar.View, let placeholderNode = navigationBarView.searchContentNode?.placeholderNode {
let timingFunction: String
switch curve {
case .easeInOut:
timingFunction = CAMediaTimingFunctionName.easeOut.rawValue
case .linear:
timingFunction = CAMediaTimingFunctionName.linear.rawValue
case .spring:
timingFunction = kCAMediaTimingFunctionSpring
case .custom:
timingFunction = kCAMediaTimingFunctionSpring
}
searchBarNode.animateIn(from: placeholderNode, duration: duration, timingFunction: timingFunction)
}
}
} else {
self.searchQuery = ""
if let searchBarNode = self.searchBarNode {
self.searchBarNode = nil
removedSearchBar = searchBarNode
}
}
let contentListNode: ContentListNode
if let current = self.contentListNode {
contentListNode = current
} else {
contentListNode = ContentListNode(parentView: self, context: component.context)
self.contentListNode = contentListNode
contentListNode.visibleContentOffsetChanged = { [weak self] offset in
guard let self else {
return
}
guard let navigationHeight = self.navigationHeight else {
return
}
if self.ignoreVisibleContentOffsetChanged {
return
}
self.updateNavigationScrolling(navigationHeight: navigationHeight, transition: .immediate)
}
if let sectionHeaderView = self.sectionHeader.view {
self.insertSubview(contentListNode.view, belowSubview: sectionHeaderView)
} else if let navigationBarComponentView = self.navigationBarView.view {
self.insertSubview(contentListNode.view, belowSubview: navigationBarComponentView)
} else {
self.addSubview(contentListNode.view)
}
}
var contentTopInset = navigationHeight
if let sectionHeaderView = self.sectionHeader.view {
contentTopInset += sectionHeaderView.bounds.height
}
transition.setFrame(view: contentListNode.view, frame: CGRect(origin: CGPoint(), size: availableSize))
self.ignoreVisibleContentOffsetChanged = true
contentListNode.update(size: availableSize, insets: UIEdgeInsets(top: contentTopInset, left: environment.safeInsets.left, bottom: listBottomInset, right: environment.safeInsets.right), transition: transition)
self.ignoreVisibleContentOffsetChanged = false
var entries: [ContentEntry] = []
if let recommendedAppPeers = self.recommendedAppPeers {
let normalizedSearchQuery = self.searchQuery.lowercased().trimmingTrailingSpaces()
for peer in recommendedAppPeers {
if !self.searchQuery.isEmpty {
var matches = false
if peer.indexName.matchesByTokens(normalizedSearchQuery) {
matches = true
}
if !matches {
continue
}
}
entries.append(.item(peer: peer, sortIndex: entries.count))
}
}
contentListNode.setEntries(entries: entries, animated: !transition.animation.isImmediate)
if let sectionHeaderView = self.sectionHeader.view {
sectionHeaderView.isHidden = entries.isEmpty
}
if !self.searchQuery.isEmpty && entries.isEmpty {
var emptySearchStateTransition = transition
let emptySearchState: ComponentView<Empty>
if let current = self.emptySearchState {
emptySearchState = current
} else {
emptySearchStateTransition = emptySearchStateTransition.withAnimation(.none)
emptySearchState = ComponentView()
self.emptySearchState = emptySearchState
}
let emptySearchStateSize = emptySearchState.update(
transition: .immediate,
component: AnyComponent(BalancedTextComponent(
text: .plain(NSAttributedString(string: environment.strings.Conversation_SearchNoResults, font: Font.regular(17.0), textColor: environment.theme.list.freeTextColor, paragraphAlignment: .center)),
horizontalAlignment: .center,
maximumNumberOfLines: 0
)),
environment: {},
containerSize: CGSize(width: availableSize.width - 16.0 * 2.0, height: availableSize.height)
)
var emptySearchStateBottomInset = listBottomInset
emptySearchStateBottomInset = max(emptySearchStateBottomInset, environment.inputHeight)
let emptySearchStateFrame = CGRect(origin: CGPoint(x: floor((availableSize.width - emptySearchStateSize.width) * 0.5), y: navigationHeight + floor((availableSize.height - emptySearchStateBottomInset - navigationHeight) * 0.5)), size: emptySearchStateSize)
if let emptySearchStateView = emptySearchState.view {
if emptySearchStateView.superview == nil {
if let navigationBarComponentView = self.navigationBarView.view {
self.insertSubview(emptySearchStateView, belowSubview: navigationBarComponentView)
} else {
self.addSubview(emptySearchStateView)
}
}
emptySearchStateTransition.containedViewLayoutTransition.updatePosition(layer: emptySearchStateView.layer, position: emptySearchStateFrame.center)
emptySearchStateView.bounds = CGRect(origin: CGPoint(), size: emptySearchStateFrame.size)
}
} else if let emptySearchState = self.emptySearchState {
self.emptySearchState = nil
emptySearchState.view?.removeFromSuperview()
}
if let recommendedAppPeers = self.recommendedAppPeers, !recommendedAppPeers.isEmpty {
contentListNode.isHidden = false
} else {
contentListNode.isHidden = true
}
self.updateNavigationScrolling(navigationHeight: navigationHeight, transition: transition)
if let navigationBarComponentView = self.navigationBarView.view as? ChatListNavigationBar.View {
navigationBarComponentView.deferScrollApplication = false
navigationBarComponentView.applyCurrentScroll(transition: transition)
}
if let removedSearchBar {
if !transition.animation.isImmediate, let navigationBarView = self.navigationBarView.view as? ChatListNavigationBar.View, let placeholderNode =
navigationBarView.searchContentNode?.placeholderNode {
removedSearchBar.transitionOut(to: placeholderNode, transition: transition.containedViewLayoutTransition, completion: { [weak removedSearchBar] in
removedSearchBar?.view.removeFromSuperview()
})
} else {
removedSearchBar.view.removeFromSuperview()
}
}
return availableSize
}
}
func makeView() -> View {
return View()
}
func update(view: View, availableSize: CGSize, state: EmptyComponentState, environment: Environment<EnvironmentType>, transition: ComponentTransition) -> CGSize {
return view.update(component: self, availableSize: availableSize, state: state, environment: environment, transition: transition)
}
}
public final class MiniAppListScreen: ViewControllerComponentContainer {
public final class InitialData: MiniAppListScreenInitialData {
let recommendedAppPeers: [EnginePeer]
init(
recommendedAppPeers: [EnginePeer]
) {
self.recommendedAppPeers = recommendedAppPeers
}
}
private let context: AccountContext
public init(context: AccountContext, initialData: InitialData) {
self.context = context
super.init(context: context, component: MiniAppListScreenComponent(
context: context,
initialData: initialData
), navigationBarAppearance: .none, theme: .default, updatedPresentationData: nil)
self.navigationPresentation = .modal
self.scrollToTop = { [weak self] in
guard let self, let componentView = self.node.hostView.componentView as? MiniAppListScreenComponent.View else {
return
}
componentView.scrollToTop()
}
self.attemptNavigation = { [weak self] complete in
guard let self, let componentView = self.node.hostView.componentView as? MiniAppListScreenComponent.View else {
return true
}
return componentView.attemptNavigation(complete: complete)
}
}
required public init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
deinit {
}
@objc private func cancelPressed() {
self.dismiss()
}
override public func containerLayoutUpdated(_ layout: ContainerViewLayout, transition: ContainedViewLayoutTransition) {
super.containerLayoutUpdated(layout, transition: transition)
}
public static func initialData(context: AccountContext) -> Signal<MiniAppListScreenInitialData, NoError> {
let recommendedAppPeers = context.engine.peers.recommendedAppPeerIds()
|> take(1)
|> mapToSignal { peerIds -> Signal<[EnginePeer], NoError> in
guard let peerIds else {
return .single([])
}
return context.engine.data.get(
EngineDataList(peerIds.map(TelegramEngine.EngineData.Item.Peer.Peer.init(id:)))
)
|> map { peers -> [EnginePeer] in
return peers.compactMap { $0 }
}
}
return recommendedAppPeers
|> map { recommendedAppPeers -> MiniAppListScreenInitialData in
return InitialData(
recommendedAppPeers: recommendedAppPeers
)
}
}
}
private final class ListHeaderComponent: Component {
let theme: PresentationTheme
let title: String
init(
theme: PresentationTheme,
title: String
) {
self.theme = theme
self.title = title
}
static func ==(lhs: ListHeaderComponent, rhs: ListHeaderComponent) -> Bool {
if lhs.theme !== rhs.theme {
return false
}
if lhs.title != rhs.title {
return false
}
return true
}
final class View: UIView {
private let title = ComponentView<Empty>()
private var component: ListHeaderComponent?
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func update(component: ListHeaderComponent, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: ComponentTransition) -> CGSize {
if self.component?.theme !== component.theme {
self.backgroundColor = component.theme.chatList.sectionHeaderFillColor
}
let insets = UIEdgeInsets(top: 7.0, left: 16.0, bottom: 7.0, right: 16.0)
let titleString = component.title
let titleSize = self.title.update(
transition: .immediate,
component: AnyComponent(MultilineTextComponent(
text: .plain(NSAttributedString(string: titleString, font: Font.regular(13.0), textColor: component.theme.chatList.sectionHeaderTextColor))
)),
environment: {},
containerSize: CGSize(width: availableSize.width - insets.left - insets.right, height: 100.0)
)
if let titleView = self.title.view {
if titleView.superview == nil {
self.addSubview(titleView)
}
titleView.frame = CGRect(origin: CGPoint(x: insets.left, y: insets.top), size: titleSize)
}
return CGSize(width: availableSize.width, height: titleSize.height + insets.top + insets.bottom)
}
}
func makeView() -> View {
return View(frame: CGRect())
}
func update(view: View, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: ComponentTransition) -> CGSize {
return view.update(component: self, availableSize: availableSize, state: state, environment: environment, transition: transition)
}
}