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//
// Copyright (C) 2024 Apple Inc. All rights reserved.
//
#if canImport(WritingTools) && canImport(UIKit)
import OSLog
import WebKit
import WebKitSwift
internal import UIKit_Private
@_spi(TextEffects) import UIKit
@objc public enum WKTextAnimationType: Int {
case initial
case source
case final
}
@objc(WKSTextAnimationManager)
@MainActor public final class TextAnimationManager: NSObject {
private static let logger = Logger(subsystem: "com.apple.WebKit", category: "TextAnimationType")
final class TextEffectChunk: UITextEffectTextChunk {
public let uuid: UUID
public init(uuid: UUID) {
self.uuid = uuid
}
}
private var currentEffect: UITextEffectView.EffectID?
private lazy var effectView = UITextEffectView(source: self)
private var chunkToEffect = [UUID: UITextEffectView.EffectID]()
@objc public weak var delegate: WKSTextAnimationSourceDelegate?
@objc(initWithDelegate:) public init(with delegate: any WKSTextAnimationSourceDelegate) {
super.init()
self.delegate = delegate
delegate.containingViewForTextAnimationType().addSubview(self.effectView)
}
@objc(addTextAnimationForAnimationID:withStyleType:) public func beginEffect(for uuid: UUID, style: WKTextAnimationType) {
switch style {
case .initial:
let newEffect = self.effectView.addEffect(UITextEffectView.PonderingEffect(chunk: TextEffectChunk(uuid: uuid), view: self.effectView) as UITextEffectView.TextEffect)
self.chunkToEffect[uuid] = newEffect
case .source:
let newEffect = self.effectView.addEffect(UITextEffectView.ReplacementTextEffect(chunk: TextEffectChunk(uuid: uuid), view: self.effectView, delegate:self) as UITextEffectView.TextEffect)
self.chunkToEffect[uuid] = newEffect
case .final:
break
// Discard `.final` since we don't manually start the 2nd part of the animation on iOS.
}
}
@objc(removeTextAnimationForAnimationID:) public func endEffect(for uuid: UUID) {
if let effectID = chunkToEffect.removeValue(forKey: uuid) {
self.effectView.removeEffect(effectID)
}
}
}
@_spi(TextEffects)
extension TextAnimationManager: UITextEffectViewSource {
public func targetedPreview(for chunk: UITextEffectTextChunk) async -> UITargetedPreview {
guard let delegate = self.delegate else {
Self.logger.debug("Can't obtain Targeted Preview. Missing delegate." )
return UITargetedPreview(view: UIView(frame: .zero))
}
let defaultPreview = UITargetedPreview(view: UIView(frame: .zero), parameters: UIPreviewParameters(), target: UIPreviewTarget(container: delegate.containingViewForTextAnimationType(), center: delegate.containingViewForTextAnimationType().center))
guard let uuidChunk = chunk as? TextEffectChunk else {
Self.logger.debug("Can't get text preview. Incorrect UITextEffectTextChunk subclass")
return defaultPreview
}
guard let preview = await delegate.targetedPreview(for: uuidChunk.uuid) else {
Self.logger.debug("Could not generate a UITargetedPreview")
return defaultPreview
}
return preview
}
public func updateTextChunkVisibilityForAnimation(_ chunk: UITextEffectTextChunk, visible: Bool) async {
guard let uuidChunk = chunk as? TextEffectChunk else {
Self.logger.debug("Can't update text visibility. Incorrect UITextEffectTextChunk subclass")
return
}
guard let delegate = self.delegate else {
Self.logger.debug("Can't update Chunk Visibility. Missing delegate." )
return
}
await delegate.updateUnderlyingTextVisibility(forTextAnimationID:uuidChunk.uuid, visible: visible)
}
}
@_spi(TextEffects)
extension TextAnimationManager: UITextEffectView.ReplacementTextEffect.Delegate {
public func performReplacementAndGeneratePreview(for chunk: UITextEffectTextChunk, effect: UITextEffectView.ReplacementTextEffect, animation: UITextEffectView.ReplacementTextEffect.AnimationParameters) async -> UITargetedPreview? {
guard let uuidChunk = chunk as? TextEffectChunk else {
Self.logger.debug("Can't get text preview. Incorrect UITextEffectTextChunk subclass")
return nil
}
guard let delegate = self.delegate else {
Self.logger.debug("Can't obtain Targeted Preview. Missing delegate." )
return nil
}
let preview = await withCheckedContinuation { continuation in
delegate.callCompletionHandler(forAnimationID: uuidChunk.uuid) { preview in
continuation.resume(returning: preview)
}
}
return preview
}
public func replacementEffectDidComplete(_ effect: UITextEffectView.ReplacementTextEffect) {
self.effectView.removeEffect(effect.id)
guard let (animationID, _) = self.chunkToEffect.first(where: { (_, value) in value == effect.id }) else {
return
}
self.chunkToEffect[animationID] = nil
guard let delegate = self.delegate else {
Self.logger.debug("Missing delegate.")
return
}
delegate.callCompletionHandler(forAnimationID: animationID)
delegate.replacementEffectDidComplete();
}
}
#endif // canImport(WritingTools) && canImport(UIKit)
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