NetNewsWire/Multiplatform/Shared/Article/PreloadedWebView.swift

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//
// PreloadedWebView.swift
// Multiplatform iOS
//
// Created by Maurice Parker on 7/6/20.
// Copyright © 2020 Ranchero Software. All rights reserved.
//
import Foundation
import WebKit
import RSWeb
class PreloadedWebView: WKWebView {
private var isReady: Bool = false
private var readyCompletion: (() -> Void)?
init(articleIconSchemeHandler: ArticleIconSchemeHandler) {
let preferences = WKPreferences()
preferences.javaScriptCanOpenWindowsAutomatically = false
let configuration = WKWebViewConfiguration()
configuration.preferences = preferences
configuration.setValue(true, forKey: "allowUniversalAccessFromFileURLs")
#if os(iOS)
configuration.allowsInlineMediaPlayback = true
#endif
configuration.mediaTypesRequiringUserActionForPlayback = .audio
configuration.setURLSchemeHandler(articleIconSchemeHandler, forURLScheme: ArticleRenderer.imageIconScheme)
super.init(frame: .zero, configuration: configuration)
if let userAgent = UserAgent.fromInfoPlist() {
customUserAgent = userAgent
}
}
required init?(coder: NSCoder) {
super.init(coder: coder)
}
func preload() {
navigationDelegate = self
loadFileURL(ArticleRenderer.blank.url, allowingReadAccessTo: ArticleRenderer.blank.baseURL)
}
func ready(completion: @escaping () -> Void) {
if isReady {
completeRequest(completion: completion)
} else {
readyCompletion = completion
}
}
#if os(macOS)
override func willOpenMenu(_ menu: NSMenu, with event: NSEvent) {
// Theres no API for affecting a WKWebViews contextual menu.
// (WebView had API for this.)
//
// This a minor hack. It hides unwanted menu items.
// The menu item identifiers are not documented anywhere;
// they could change, and this code would need updating.
for menuItem in menu.items {
if shouldHideMenuItem(menuItem) {
menuItem.isHidden = true
}
}
super.willOpenMenu(menu, with: event)
}
#endif
}
// MARK: WKScriptMessageHandler
extension PreloadedWebView: WKNavigationDelegate {
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
isReady = true
if let completion = readyCompletion {
completeRequest(completion: completion)
readyCompletion = nil
}
}
}
// MARK: Private
private extension PreloadedWebView {
func completeRequest(completion: @escaping () -> Void) {
isReady = false
navigationDelegate = nil
completion()
}
}
#if os(macOS)
private extension NSUserInterfaceItemIdentifier {
static let DetailMenuItemIdentifierReload = NSUserInterfaceItemIdentifier(rawValue: "WKMenuItemIdentifierReload")
static let DetailMenuItemIdentifierOpenLink = NSUserInterfaceItemIdentifier(rawValue: "WKMenuItemIdentifierOpenLink")
}
private extension PreloadedWebView {
static let menuItemIdentifiersToHide: [NSUserInterfaceItemIdentifier] = [.DetailMenuItemIdentifierReload, .DetailMenuItemIdentifierOpenLink]
static let menuItemIdentifierMatchStrings = ["newwindow", "download"]
func shouldHideMenuItem(_ menuItem: NSMenuItem) -> Bool {
guard let identifier = menuItem.identifier else {
return false
}
if PreloadedWebView.menuItemIdentifiersToHide.contains(identifier) {
return true
}
let lowerIdentifier = identifier.rawValue.lowercased()
for matchString in PreloadedWebView.menuItemIdentifierMatchStrings {
if lowerIdentifier.contains(matchString) {
return true
}
}
return false
}
}
#endif