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