NetNewsWire/Mac/MainWindow/Detail/DetailWebViewController.swift

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Swift
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//
// DetailWebViewController.swift
// NetNewsWire
//
// Created by Brent Simmons on 2/11/19.
// Copyright © 2019 Ranchero Software. All rights reserved.
//
import AppKit
import WebKit
import RSWeb
import Articles
protocol DetailWebViewControllerDelegate: class {
func mouseDidEnter(_: DetailWebViewController, link: String)
func mouseDidExit(_: DetailWebViewController, link: String)
}
final class DetailWebViewController: NSViewController, WKUIDelegate {
weak var delegate: DetailWebViewControllerDelegate?
var webView: DetailWebView!
var state: DetailState = .noSelection {
didSet {
if state != oldValue {
reloadHTML()
}
}
}
#if !MAC_APP_STORE
private var webInspectorEnabled: Bool {
get {
return webView.configuration.preferences._developerExtrasEnabled
}
set {
webView.configuration.preferences._developerExtrasEnabled = newValue
}
}
#endif
private var waitingForFirstReload = false
private let keyboardDelegate = DetailKeyboardDelegate()
private struct MessageName {
static let mouseDidEnter = "mouseDidEnter"
static let mouseDidExit = "mouseDidExit"
}
override func loadView() {
// Wrap the webview in a box configured with the same background color that the web view uses
let box = NSBox(frame: .zero)
box.boxType = .custom
box.borderType = .noBorder
box.titlePosition = .noTitle
box.contentViewMargins = .zero
box.fillColor = NSColor(named: "webviewBackgroundColor")!
view = box
let preferences = WKPreferences()
preferences.minimumFontSize = 12.0
preferences.javaScriptCanOpenWindowsAutomatically = false
preferences.javaEnabled = false
preferences.javaScriptEnabled = true
preferences.plugInsEnabled = false
let configuration = WKWebViewConfiguration()
configuration.preferences = preferences
let userContentController = WKUserContentController()
userContentController.add(self, name: MessageName.mouseDidEnter)
userContentController.add(self, name: MessageName.mouseDidExit)
configuration.userContentController = userContentController
webView = DetailWebView(frame: NSRect.zero, configuration: configuration)
webView.uiDelegate = self
webView.navigationDelegate = self
webView.keyboardDelegate = keyboardDelegate
webView.translatesAutoresizingMaskIntoConstraints = false
if let userAgent = UserAgent.fromInfoPlist() {
webView.customUserAgent = userAgent
}
box.addSubview(webView)
let constraints = [
webView.topAnchor.constraint(equalTo: view.topAnchor),
webView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
webView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
webView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
]
NSLayoutConstraint.activate(constraints)
// Hide the web view until the first reload (navigation) is complete (plus some delay) to avoid the awful white flash that happens on the initial display in dark mode.
// See bug #901.
webView.isHidden = true
waitingForFirstReload = true
#if !MAC_APP_STORE
webInspectorEnabled = AppDefaults.webInspectorEnabled
NotificationCenter.default.addObserver(self, selector: #selector(webInspectorEnabledDidChange(_:)), name: .WebInspectorEnabledDidChange, object: nil)
#endif
webView.loadHTMLString(ArticleRenderer.page.html, baseURL: ArticleRenderer.page.baseURL)
}
// MARK: Scrolling
func canScrollDown(_ callback: @escaping (Bool) -> Void) {
fetchScrollInfo { (scrollInfo) in
callback(scrollInfo?.canScrollDown ?? false)
}
}
override func scrollPageDown(_ sender: Any?) {
webView.scrollPageDown(sender)
}
}
// MARK: - WKScriptMessageHandler
extension DetailWebViewController: WKScriptMessageHandler {
func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
if message.name == MessageName.mouseDidEnter, let link = message.body as? String {
delegate?.mouseDidEnter(self, link: link)
}
else if message.name == MessageName.mouseDidExit, let link = message.body as? String{
delegate?.mouseDidExit(self, link: link)
}
}
}
// MARK: - WKNavigationDelegate
extension DetailWebViewController: WKNavigationDelegate {
public func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
if navigationAction.navigationType == .linkActivated {
if let url = navigationAction.request.url {
Browser.open(url.absoluteString)
}
decisionHandler(.cancel)
return
}
decisionHandler(.allow)
}
public func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
// See note in viewDidLoad()
if waitingForFirstReload {
assert(webView.isHidden)
waitingForFirstReload = false
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reloadHTML()
// Waiting for the first navigation to complete isn't long enough to avoid the flash of white.
// A hard coded value is awful, but 5/100th of a second seems to be enough.
DispatchQueue.main.asyncAfter(deadline: .now() + 0.05) {
webView.isHidden = false
}
}
}
}
// MARK: - Private
struct TemplateData: Codable {
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let style: String
let body: String
}
private extension DetailWebViewController {
func reloadHTML() {
let style = ArticleStylesManager.shared.currentStyle
let rendering: ArticleRenderer.Rendering
switch state {
case .noSelection:
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rendering = ArticleRenderer.noSelectionHTML(style: style)
case .multipleSelection:
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rendering = ArticleRenderer.multipleSelectionHTML(style: style)
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case .loading:
rendering = ArticleRenderer.loadingHTML(style: style)
case .article(let article):
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rendering = ArticleRenderer.articleHTML(article: article, style: style)
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case .extracted(let article, let extractedArticle):
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rendering = ArticleRenderer.articleHTML(article: article, extractedArticle: extractedArticle, style: style)
}
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let templateData = TemplateData(style: rendering.style, body: rendering.html)
let encoder = JSONEncoder()
var render = "error();"
if let data = try? encoder.encode(templateData) {
let json = String(data: data, encoding: .utf8)!
render = "render(\(json));"
}
webView.evaluateJavaScript(render)
}
func fetchScrollInfo(_ callback: @escaping (ScrollInfo?) -> Void) {
let javascriptString = "var x = {contentHeight: document.body.scrollHeight, offsetY: document.body.scrollTop}; x"
webView.evaluateJavaScript(javascriptString) { (info, error) in
guard let info = info as? [String: Any] else {
callback(nil)
return
}
guard let contentHeight = info["contentHeight"] as? CGFloat, let offsetY = info["offsetY"] as? CGFloat else {
callback(nil)
return
}
let scrollInfo = ScrollInfo(contentHeight: contentHeight, viewHeight: self.webView.frame.height, offsetY: offsetY)
callback(scrollInfo)
}
}
#if !MAC_APP_STORE
@objc func webInspectorEnabledDidChange(_ notification: Notification) {
self.webInspectorEnabled = notification.object! as! Bool
}
#endif
}
// MARK: - ScrollInfo
private struct ScrollInfo {
let contentHeight: CGFloat
let viewHeight: CGFloat
let offsetY: CGFloat
let canScrollDown: Bool
let canScrollUp: Bool
init(contentHeight: CGFloat, viewHeight: CGFloat, offsetY: CGFloat) {
self.contentHeight = contentHeight
self.viewHeight = viewHeight
self.offsetY = offsetY
self.canScrollDown = viewHeight + offsetY < contentHeight
self.canScrollUp = offsetY > 0.1
}
}