mastodon-ios/Mastodon/Scene/Compose/ComposeViewModel.swift

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//
// ComposeViewModel.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-3-11.
//
import UIKit
import Combine
import CoreData
import CoreDataStack
final class ComposeViewModel {
var disposeBag = Set<AnyCancellable>()
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// input
let context: AppContext
let composeKind: ComposeStatusSection.ComposeKind
let composeTootAttribute = ComposeStatusItem.ComposeTootAttribute()
let composeContent = CurrentValueSubject<String, Never>("")
let activeAuthentication: CurrentValueSubject<MastodonAuthentication?, Never>
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// output
var diffableDataSource: UITableViewDiffableDataSource<ComposeStatusSection, ComposeStatusItem>!
// UI & UX
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let title: CurrentValueSubject<String, Never>
let shouldDismiss = CurrentValueSubject<Bool, Never>(true)
let isComposeTootBarButtonItemEnabled = CurrentValueSubject<Bool, Never>(false)
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init(
context: AppContext,
composeKind: ComposeStatusSection.ComposeKind
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) {
self.context = context
self.composeKind = composeKind
switch composeKind {
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case .post: self.title = CurrentValueSubject(L10n.Scene.Compose.Title.newPost)
case .reply: self.title = CurrentValueSubject(L10n.Scene.Compose.Title.newReply)
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}
self.activeAuthentication = CurrentValueSubject(context.authenticationService.activeMastodonAuthentication.value)
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// end init
// bind active authentication
context.authenticationService.activeMastodonAuthentication
.assign(to: \.value, on: activeAuthentication)
.store(in: &disposeBag)
activeAuthentication
.sink { [weak self] mastodonAuthentication in
guard let self = self else { return }
let mastodonUser = mastodonAuthentication?.user
let username = mastodonUser?.username ?? " "
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self.composeTootAttribute.avatarURL.value = mastodonUser?.avatarImageURL()
self.composeTootAttribute.displayName.value = {
guard let displayName = mastodonUser?.displayName, !displayName.isEmpty else {
return username
}
return displayName
}()
self.composeTootAttribute.username.value = username
}
.store(in: &disposeBag)
composeTootAttribute.composeContent
.receive(on: DispatchQueue.main)
.map { content in
let content = content?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
return !content.isEmpty
}
.assign(to: \.value, on: isComposeTootBarButtonItemEnabled)
.store(in: &disposeBag)
composeTootAttribute.composeContent
.receive(on: DispatchQueue.main)
.map { content in
let content = content ?? ""
return content.isEmpty
}
.assign(to: \.value, on: shouldDismiss)
.store(in: &disposeBag)
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}
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}