NetNewsWire/Evergreen/MainWindow/Detail/DetailViewController.swift

312 lines
7.4 KiB
Swift

//
// DetailViewController.swift
// Evergreen
//
// Created by Brent Simmons on 7/26/15.
// Copyright © 2015 Ranchero Software, LLC. All rights reserved.
//
import Foundation
import WebKit
import RSCore
import Data
import RSWeb
final class DetailViewController: NSViewController, WKNavigationDelegate, WKUIDelegate {
@IBOutlet var containerView: DetailContainerView!
var webview: DetailWebView!
var noSelectionView: NoSelectionView!
var article: Article? {
didSet {
reloadHTML()
showOrHideWebView()
}
}
private var webviewIsHidden: Bool {
return containerView.contentView !== webview
}
private struct MessageName {
static let mouseDidEnter = "mouseDidEnter"
static let mouseDidExit = "mouseDidExit"
}
override func viewDidLoad() {
NotificationCenter.default.addObserver(self, selector: #selector(timelineSelectionDidChange(_:)), name: .TimelineSelectionDidChange, object: nil)
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: self.view.bounds, configuration: configuration)
webview.uiDelegate = self
webview.navigationDelegate = self
webview.translatesAutoresizingMaskIntoConstraints = false
if let userAgent = UserAgent.fromInfoPlist() {
webview.customUserAgent = userAgent
}
noSelectionView = NoSelectionView(frame: self.view.bounds)
containerView.viewController = self
showOrHideWebView()
}
// MARK: - Scrolling
func canScrollDown(_ callback: @escaping (Bool) -> Void) {
if webviewIsHidden {
callback(false)
return
}
fetchScrollInfo { (scrollInfo) in
callback(scrollInfo?.canScrollDown ?? false)
}
}
override func scrollPageDown(_ sender: Any?) {
guard !webviewIsHidden else {
return
}
webview.scrollPageDown(sender)
}
// MARK: Notifications
@objc func timelineSelectionDidChange(_ notification: Notification) {
guard let userInfo = notification.userInfo else {
return
}
guard let timelineView = userInfo[UserInfoKey.view] as? NSView, timelineView.window === view.window else {
return
}
let timelineArticle = userInfo[UserInfoKey.article] as? Article
article = timelineArticle
}
func viewWillStartLiveResize() {
webview.evaluateJavaScript("document.body.style.overflow = 'hidden';", completionHandler: nil)
}
func viewDidEndLiveResize() {
webview.evaluateJavaScript("document.body.style.overflow = 'visible';", completionHandler: nil)
}
// MARK: Private
private func reloadHTML() {
if let article = article {
let articleRenderer = ArticleRenderer(article: article, style: ArticleStylesManager.shared.currentStyle)
webview.loadHTMLString(articleRenderer.html, baseURL: articleRenderer.baseURL)
}
else {
webview.loadHTMLString("", baseURL: nil)
}
}
private func showOrHideWebView() {
if let _ = article {
switchToView(webview)
}
else {
switchToView(noSelectionView)
}
}
private func switchToView(_ view: NSView) {
if containerView.contentView == view {
return
}
containerView.contentView = view
}
// MARK: 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)
}
}
extension DetailViewController: WKScriptMessageHandler {
func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
if message.name == MessageName.mouseDidEnter, let link = message.body as? String {
mouseDidEnter(link)
}
else if message.name == MessageName.mouseDidExit, let link = message.body as? String{
mouseDidExit(link)
}
}
private func mouseDidEnter(_ link: String) {
if link.isEmpty {
return
}
var userInfo = UserInfoDictionary()
userInfo[UserInfoKey.view] = view
userInfo[UserInfoKey.url] = link
NotificationCenter.default.post(name: .MouseDidEnterLink, object: self, userInfo: userInfo)
}
private func mouseDidExit(_ link: String) {
var userInfo = UserInfoDictionary()
userInfo[UserInfoKey.view] = view
userInfo[UserInfoKey.url] = link
NotificationCenter.default.post(name: .MouseDidExitLink, object: self, userInfo: userInfo)
}
}
private extension DetailViewController {
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)
}
}
}
final class DetailContainerView: NSView {
@IBOutlet var detailStatusBarView: DetailStatusBarView!
weak var viewController: DetailViewController? = nil
private var didConfigureLayer = false
override var wantsUpdateLayer: Bool {
return true
}
var contentView: NSView? {
didSet {
if let oldContentView = oldValue {
oldContentView.removeFromSuperviewWithoutNeedingDisplay()
}
if let contentView = contentView {
contentView.translatesAutoresizingMaskIntoConstraints = false
addSubview(contentView, positioned: .below, relativeTo: detailStatusBarView)
rs_addFullSizeConstraints(forSubview: contentView)
}
}
}
override func viewWillStartLiveResize() {
viewController?.viewWillStartLiveResize()
}
override func viewDidEndLiveResize() {
viewController?.viewDidEndLiveResize()
}
override func updateLayer() {
guard !didConfigureLayer else {
return
}
if let layer = layer {
let color = appDelegate.currentTheme.color(forKey: "MainWindow.Detail.backgroundColor")
layer.backgroundColor = color.cgColor
didConfigureLayer = true
}
}
}
final class NoSelectionView: NSView {
private var didConfigureLayer = false
override var wantsUpdateLayer: Bool {
return true
}
override func updateLayer() {
guard !didConfigureLayer else {
return
}
if let layer = layer {
let color = appDelegate.currentTheme.color(forKey: "MainWindow.Detail.noSelectionView.backgroundColor")
layer.backgroundColor = color.cgColor
didConfigureLayer = true
}
}
}
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
}
}