mastodon-ios/Mastodon/Scene/Compose/View/CustomEmojiPickerInputViewM...

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//
// CustomEmojiPickerInputViewModel.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-3-25.
//
import UIKit
import Combine
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import MetaTextKit
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final class CustomEmojiPickerInputViewModel {
var disposeBag = Set<AnyCancellable>()
private var customEmojiReplaceableTextInputReferences: [CustomEmojiReplaceableTextInputReference] = []
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// input
weak var customEmojiPickerInputView: CustomEmojiPickerInputView?
// output
let isCustomEmojiComposing = CurrentValueSubject<Bool, Never>(false)
}
extension CustomEmojiPickerInputViewModel {
private func removeEmptyReferences() {
customEmojiReplaceableTextInputReferences.removeAll(where: { element in
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element.value == nil
})
}
func append(customEmojiReplaceableTextInput textInput: CustomEmojiReplaceableTextInput) {
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removeEmptyReferences()
let isContains = customEmojiReplaceableTextInputReferences.contains(where: { element in
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element.value === textInput
})
guard !isContains else {
return
}
customEmojiReplaceableTextInputReferences.append(CustomEmojiReplaceableTextInputReference(value: textInput))
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}
func insertText(_ text: String) -> CustomEmojiReplaceableTextInputReference? {
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removeEmptyReferences()
for reference in customEmojiReplaceableTextInputReferences {
guard let textInput = reference.value else { continue }
guard textInput.isFirstResponder == true else { continue }
guard let selectedTextRange = textInput.selectedTextRange else { continue }
textInput.insertText(text)
// due to insert text render as attachment
// the cursor reset logic not works
// hack with hard code +2 offset
assert(text.hasSuffix(": "))
guard text.hasPrefix(":") && text.hasSuffix(": ") else { continue }
if let _ = textInput as? MetaTextView {
if let newPosition = textInput.position(from: selectedTextRange.start, offset: 2) {
let newSelectedTextRange = textInput.textRange(from: newPosition, to: newPosition)
textInput.selectedTextRange = newSelectedTextRange
}
} else {
if let newPosition = textInput.position(from: selectedTextRange.start, offset: text.length) {
let newSelectedTextRange = textInput.textRange(from: newPosition, to: newPosition)
textInput.selectedTextRange = newSelectedTextRange
}
}
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return reference
}
return nil
}
}