107 lines
4.0 KiB
Swift
107 lines
4.0 KiB
Swift
//
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// ComposeViewModel.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-3-11.
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//
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import UIKit
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import Combine
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import CoreData
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import CoreDataStack
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final class ComposeViewModel {
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var disposeBag = Set<AnyCancellable>()
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// input
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let context: AppContext
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let composeKind: ComposeStatusSection.ComposeKind
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let composeStatusAttribute = ComposeStatusItem.ComposeStatusAttribute()
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let composeContent = CurrentValueSubject<String, Never>("")
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let activeAuthentication: CurrentValueSubject<MastodonAuthentication?, Never>
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// output
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var diffableDataSource: UITableViewDiffableDataSource<ComposeStatusSection, ComposeStatusItem>!
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// UI & UX
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let title: CurrentValueSubject<String, Never>
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let shouldDismiss = CurrentValueSubject<Bool, Never>(true)
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let isComposeTootBarButtonItemEnabled = CurrentValueSubject<Bool, Never>(false)
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// custom emojis
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let customEmojiViewModel = CurrentValueSubject<EmojiService.CustomEmojiViewModel?, Never>(nil)
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init(
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context: AppContext,
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composeKind: ComposeStatusSection.ComposeKind
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) {
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self.context = context
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self.composeKind = composeKind
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switch composeKind {
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case .post: self.title = CurrentValueSubject(L10n.Scene.Compose.Title.newPost)
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case .reply: self.title = CurrentValueSubject(L10n.Scene.Compose.Title.newReply)
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}
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self.activeAuthentication = CurrentValueSubject(context.authenticationService.activeMastodonAuthentication.value)
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// end init
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// bind active authentication
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context.authenticationService.activeMastodonAuthentication
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.assign(to: \.value, on: activeAuthentication)
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.store(in: &disposeBag)
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// bind avatar and names
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activeAuthentication
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.sink { [weak self] mastodonAuthentication in
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guard let self = self else { return }
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let mastodonUser = mastodonAuthentication?.user
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let username = mastodonUser?.username ?? " "
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self.composeStatusAttribute.avatarURL.value = mastodonUser?.avatarImageURL()
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self.composeStatusAttribute.displayName.value = {
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guard let displayName = mastodonUser?.displayName, !displayName.isEmpty else {
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return username
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}
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return displayName
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}()
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self.composeStatusAttribute.username.value = username
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}
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.store(in: &disposeBag)
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// bind compose bar button item UI state
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composeStatusAttribute.composeContent
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.receive(on: DispatchQueue.main)
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.map { content in
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let content = content?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
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return !content.isEmpty
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}
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.assign(to: \.value, on: isComposeTootBarButtonItemEnabled)
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.store(in: &disposeBag)
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// bind modal dismiss state
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composeStatusAttribute.composeContent
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.receive(on: DispatchQueue.main)
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.map { content in
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let content = content ?? ""
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return content.isEmpty
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}
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.assign(to: \.value, on: shouldDismiss)
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.store(in: &disposeBag)
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// bind custom emojis
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context.authenticationService.activeMastodonAuthenticationBox
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.receive(on: DispatchQueue.main)
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.sink { [weak self] activeMastodonAuthenticationBox in
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guard let self = self else { return }
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guard let activeMastodonAuthenticationBox = activeMastodonAuthenticationBox else { return }
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let domain = activeMastodonAuthenticationBox.domain
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// trigger dequeue to preload emojis
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_ = self.context.emojiService.dequeueCustomEmojiViewModel(for: domain)
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}
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.store(in: &disposeBag)
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}
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}
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