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// Copyright (C) 2025 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.
internal import SwiftUI
@_spi(Private) @_spi(CrossImportOverlay) import WebKit
internal import WebKit_Internal
@MainActor
struct WebViewRepresentable {
let owner: WebView
func makePlatformView(context: Context) -> CocoaWebViewAdapter {
// FIXME: Make this more robust by figuring out what happens when a WebPage moves between representables.
// We can't have multiple owners regardless, but we'll want to decide if it's an error, if we can handle it gracefully, and how deterministic it might even be.
// Perhaps we should keep an ownership assertion which we can tear down in something like dismantleUIView().
precondition(!owner.page.isBoundToWebView, "This web page is already bound to another web view.")
let parent = CocoaWebViewAdapter()
parent.webView = owner.page.backingWebView
owner.page.isBoundToWebView = true
return parent
}
func updatePlatformView(_ platformView: CocoaWebViewAdapter, context: Context) {
let webView = owner.page.backingWebView
let environment = context.environment
platformView.webView = webView
webView.allowsBackForwardNavigationGestures = environment.webViewAllowsBackForwardNavigationGestures.value != .disabled
webView.allowsLinkPreview = environment.webViewAllowsLinkPreview.value != .disabled
let isOpaque = environment.webViewContentBackground != .hidden
#if os(macOS)
if webView._drawsBackground != isOpaque {
webView._drawsBackground = isOpaque
}
#else
if webView.isOpaque != isOpaque {
webView.isOpaque = isOpaque
}
#endif
if EquatableScrollBounceBehavior(environment.verticalScrollBounceBehavior) == .always || EquatableScrollBounceBehavior(environment.verticalScrollBounceBehavior) == .automatic {
webView.alwaysBounceVertical = true
webView.bouncesVertically = true
} else if EquatableScrollBounceBehavior(environment.verticalScrollBounceBehavior) == .basedOnSize {
webView.alwaysBounceVertical = false
webView.bouncesVertically = true
}
if EquatableScrollBounceBehavior(environment.horizontalScrollBounceBehavior) == .always || EquatableScrollBounceBehavior(environment.horizontalScrollBounceBehavior) == .automatic {
webView.alwaysBounceHorizontal = true
webView.bouncesHorizontally = true
} else if EquatableScrollBounceBehavior(environment.horizontalScrollBounceBehavior) == .basedOnSize {
webView.alwaysBounceHorizontal = false
webView.bouncesHorizontally = true
}
webView.configuration.preferences.isTextInteractionEnabled = environment.webViewTextSelection
webView.configuration.preferences.isElementFullscreenEnabled = environment.webViewAllowsElementFullscreen
context.coordinator.update(platformView, configuration: self, environment: environment)
#if os(macOS) && !targetEnvironment(macCatalyst)
owner.page.setMenuBuilder(environment.webViewContextMenuContext?.menu)
#endif
}
func makeCoordinator() -> WebViewCoordinator {
WebViewCoordinator(configuration: self)
}
func sizeThatFits(_ proposal: ProposedViewSize, platformView: CocoaWebViewAdapter, context: Context) -> CGSize? {
guard let width = proposal.width, let height = proposal.height else {
return nil
}
// By default, SwiftUI allows representable views to have fractional sizes, however WebKit does not support this
// (it may result in incorrect behavior such as the size of the content view and scroll view being slightly mismatched).
return CGSize(width: width.rounded(), height: height.rounded());
}
}
@MainActor
final class WebViewCoordinator {
init(configuration: WebViewRepresentable) {
self.configuration = configuration
}
var configuration: WebViewRepresentable
func update(_ view: CocoaWebViewAdapter, configuration: WebViewRepresentable, environment: EnvironmentValues) {
self.configuration = configuration
self.updateFindInteraction(view, environment: environment)
}
private func updateFindInteraction(_ view: CocoaWebViewAdapter, environment: EnvironmentValues) {
guard let webView = view.webView else {
return
}
let findContext = environment.webViewFindContext
view.findContext = findContext
#if os(iOS)
webView.isFindInteractionEnabled = findContext.canFind
#endif
guard let findInteraction = view.findInteraction else {
return
}
let isFindNavigatorVisible = view.isFindNavigatorVisible
// Showing or hiding the find navigator can change the first responder, which triggers a graph cycle if done synchronously.
if findContext.canFind && findContext.isPresented?.wrappedValue == true && !isFindNavigatorVisible {
onNextMainRunLoop {
findInteraction.presentFindNavigator(showingReplace: false)
}
} else if findContext.isPresented?.wrappedValue == false && isFindNavigatorVisible {
onNextMainRunLoop {
findInteraction.dismissFindNavigator()
}
}
}
}
#if canImport(UIKit)
extension WebViewRepresentable: UIViewRepresentable {
func makeUIView(context: Context) -> CocoaWebViewAdapter {
makePlatformView(context: context)
}
func updateUIView(_ uiView: CocoaWebViewAdapter, context: Context) {
updatePlatformView(uiView, context: context)
}
func sizeThatFits(_ proposal: ProposedViewSize, uiView: CocoaWebViewAdapter, context: Context) -> CGSize? {
sizeThatFits(proposal, platformView: uiView, context: context)
}
}
#else
extension WebViewRepresentable: NSViewRepresentable {
func makeNSView(context: Context) -> CocoaWebViewAdapter {
makePlatformView(context: context)
}
func updateNSView(_ nsView: CocoaWebViewAdapter, context: Context) {
updatePlatformView(nsView, context: context)
}
func sizeThatFits(_ proposal: ProposedViewSize, nsView: CocoaWebViewAdapter, context: Context) -> CGSize? {
sizeThatFits(proposal, platformView: nsView, context: context)
}
}
#endif
// FIXME: (rdar://145030632) Remove this workaround when possible.
struct EquatableScrollBounceBehavior: Equatable {
static let automatic = Self(.automatic)
static let always = Self(.always)
static let basedOnSize = Self(.basedOnSize)
init(_ behavior: ScrollBounceBehavior) {
self.behavior = behavior
}
let behavior: ScrollBounceBehavior
static func == (lhs: EquatableScrollBounceBehavior, rhs: EquatableScrollBounceBehavior) -> Bool {
unsafeBitCast(lhs.behavior, to: Int8.self) == unsafeBitCast(rhs.behavior, to: Int8.self)
}
}
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