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// Copyright (C) 2024 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
#if compiler(>=6.0)
#if ENABLE_WRITING_TOOLS && canImport(UIKit)
import OSLog
#if USE_APPLE_INTERNAL_SDK
@_spi(TextEffects) import UIKit
#else
import UIKit_SPI
#endif // USE_APPLE_INTERNAL_SDK
@objc
@implementation
extension WKTextAnimationManager {
private static let logger = Logger(subsystem: "com.apple.WebKit", category: "WKTextAnimationManager")
private final class TextEffectChunk: UITextEffectTextChunk {
let uuid: UUID
init(uuid: UUID) {
self.uuid = uuid
}
}
@MainActor
private final class Base {
var currentEffect: UITextEffectView.EffectID?
}
// Used to workaround the fact that `@objc @implementation` does not support stored properties whose size can change
// due to Library Evolution. Do not use this property directly.
@nonobjc
private let base = Base()
@nonobjc
private final var currentEffect: UITextEffectView.EffectID? {
get { base.currentEffect }
set { base.currentEffect = newValue }
}
@nonobjc
private lazy var effectView = UITextEffectView(source: self)
@nonobjc
private var chunkToEffect: [UUID: UITextEffectView.EffectID] = [:]
private weak var delegate: WKTextAnimationSourceDelegate?
init(delegate: any WKTextAnimationSourceDelegate) {
super.init()
self.delegate = delegate
delegate.containingViewForTextAnimationType().addSubview(self.effectView)
}
@objc(addTextAnimationForAnimationID:withStyleType:)
func addTextAnimation(forAnimationID uuid: UUID, withStyleType style: WKTextAnimationType) {
switch style {
case .initial:
let newEffect = effectView.addEffect(
UITextEffectView.PonderingEffect(chunk: TextEffectChunk(uuid: uuid), view: effectView)
)
chunkToEffect[uuid] = newEffect
case .source:
let newEffect = effectView.addEffect(
UITextEffectView.ReplacementTextEffect(chunk: TextEffectChunk(uuid: uuid), view: effectView, delegate: self)
)
chunkToEffect[uuid] = newEffect
case .final:
break
// Discard `.final` since we don't manually start the 2nd part of the animation on iOS.
@unknown default:
fatalError()
}
}
func removeTextAnimation(forAnimationID uuid: UUID) {
if let effectID = chunkToEffect.removeValue(forKey: uuid) {
effectView.removeEffect(effectID)
}
}
}
@_spi(TextEffects)
extension WKTextAnimationManager: @preconcurrency UITextEffectViewSource {
// This can be made non-public once the retroactive conformance is removed.
// It is currently safe due to the fact that WebKitSwift is not itself public.
// swift-format-ignore: AllPublicDeclarationsHaveDocumentation
public func targetedPreview(for chunk: UITextEffectTextChunk) async -> UITargetedPreview {
guard let delegate else {
Self.logger.debug("Can't obtain Targeted Preview. Missing delegate.")
return UITargetedPreview(view: UIView(frame: .zero))
}
let container = delegate.containingViewForTextAnimationType()
let defaultPreview = UITargetedPreview(
view: UIView(frame: .zero),
parameters: .init(),
target: UIPreviewTarget(container: container, center: container.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
}
// This can be made non-public once the retroactive conformance is removed.
// It is currently safe due to the fact that WebKitSwift is not itself public.
// swift-format-ignore: AllPublicDeclarationsHaveDocumentation
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 else {
Self.logger.debug("Can't update Chunk Visibility. Missing delegate.")
return
}
await delegate.updateUnderlyingTextVisibility(forTextAnimationID: uuidChunk.uuid, visible: visible)
}
}
@_spi(TextEffects)
extension WKTextAnimationManager: @preconcurrency UITextEffectView.ReplacementTextEffect.Delegate {
// This can be made non-public once the retroactive conformance is removed.
// It is currently safe due to the fact that WebKitSwift is not itself public.
// swift-format-ignore: AllPublicDeclarationsHaveDocumentation
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 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
}
// This can be made non-public once the retroactive conformance is removed.
// It is currently safe due to the fact that WebKitSwift is not itself public.
// swift-format-ignore: AllPublicDeclarationsHaveDocumentation
public func replacementEffectDidComplete(_ effect: UITextEffectView.ReplacementTextEffect) {
effectView.removeEffect(effect.id)
guard let (animationID, _) = chunkToEffect.first(where: { (_, value) in value == effect.id }) else {
return
}
chunkToEffect[animationID] = nil
guard let delegate else {
Self.logger.debug("Missing delegate.")
return
}
delegate.callCompletionHandler(forAnimationID: animationID)
delegate.replacementEffectDidComplete()
}
}
#endif // ENABLE_WRITING_TOOLS && canImport(UIKit)
#endif // compiler(>=6.0)
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