More StatusContentLabel cleanup

This commit is contained in:
Shadowfacts 2018-08-26 15:19:54 -04:00
parent 40ba5c371a
commit a025926c0f
2 changed files with 112 additions and 209 deletions

View File

@ -35,14 +35,13 @@ class StatusContentLabel: UILabel {
} }
} }
public var lineSpacing: CGFloat = 0
public var minimumLineHeight: CGFloat = 0
private var _customizing = true private var _customizing = true
private lazy var textStorage = NSTextStorage() private lazy var textStorage = NSTextStorage()
private lazy var layoutManager = NSLayoutManager() private lazy var layoutManager = NSLayoutManager()
private lazy var textContainer = NSTextContainer() private lazy var textContainer = NSTextContainer()
private var selectedElement: (range: NSRange, url: URL)?
private var selectedLink: (range: NSRange, url: URL)?
private var links: [NSRange: URL] = [:] private var links: [NSRange: URL] = [:]
@ -58,11 +57,27 @@ class StatusContentLabel: UILabel {
setupLabel() setupLabel()
} }
private func setupLabel() {
textStorage.addLayoutManager(layoutManager)
layoutManager.addTextContainer(textContainer)
textContainer.lineFragmentPadding = 0
textContainer.lineBreakMode = lineBreakMode
textContainer.maximumNumberOfLines = numberOfLines
isUserInteractionEnabled = true
}
override func awakeFromNib() { override func awakeFromNib() {
super.awakeFromNib() super.awakeFromNib()
updateTextStorage() updateTextStorage()
} }
override var intrinsicContentSize: CGSize {
let superSize = super.intrinsicContentSize
textContainer.size = CGSize(width: superSize.width, height: .greatestFiniteMagnitude)
let size = layoutManager.usedRect(for: textContainer)
return CGSize(width: ceil(size.width), height: ceil(size.height))
}
override func drawText(in rect: CGRect) { override func drawText(in rect: CGRect) {
let range = NSRange(location: 0, length: textStorage.length) let range = NSRange(location: 0, length: textStorage.length)
@ -73,113 +88,7 @@ class StatusContentLabel: UILabel {
layoutManager.drawGlyphs(forGlyphRange: range, at: origin) layoutManager.drawGlyphs(forGlyphRange: range, at: origin)
} }
override var intrinsicContentSize: CGSize { // MARK: - HTML parsing
let superSize = super.intrinsicContentSize
textContainer.size = CGSize(width: superSize.width, height: .greatestFiniteMagnitude)
let size = layoutManager.usedRect(for: textContainer)
return CGSize(width: ceil(size.width), height: ceil(size.height))
}
private func element(at location: CGPoint) -> (range: NSRange, url: URL)? {
guard textStorage.length > 0 else { return nil }
let boundingRect = layoutManager.boundingRect(forGlyphRange: NSRange(location: 0, length: textStorage.length), in: textContainer)
guard boundingRect.contains(location) else {
return nil
}
let index = layoutManager.glyphIndex(for: location, in: textContainer)
for (range, url) in links {
if index >= range.location && index <= range.location + range.length {
return (range, url)
}
}
return nil
}
private func updateAttributesWhenSelected(_ isSelected: Bool) {
guard let selectedElement = selectedElement else { return }
var attributes = textStorage.attributes(at: 0, effectiveRange: nil)
attributes[.foregroundColor] = isSelected ? nil : UIColor.blue
textStorage.addAttributes(attributes, range: selectedElement.range)
setNeedsDisplay()
}
private func onTouch(_ touch: UITouch) -> Bool {
let location = touch.location(in: self)
var avoidSuperCall = false
switch touch.phase {
case .began, .moved:
if let element = element(at: location) {
if element.range.location != selectedElement?.range.location || element.range.length != selectedElement?.range.length {
updateAttributesWhenSelected(false)
selectedElement = element
updateAttributesWhenSelected(true)
}
avoidSuperCall = true
} else {
updateAttributesWhenSelected(false)
selectedElement = nil
}
case .ended:
guard let selectedElement = selectedElement else { return avoidSuperCall }
print("tapped \(selectedElement)")
let when = DispatchTime.now() + Double(Int64(0.25 * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC)
DispatchQueue.main.asyncAfter(deadline: when) {
self.updateAttributesWhenSelected(false)
self.selectedElement = nil
}
case .cancelled:
updateAttributesWhenSelected(false)
selectedElement = nil
case .stationary:
break
}
return avoidSuperCall
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
if onTouch(touch) { return }
super.touchesBegan(touches, with: event)
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
if onTouch(touch) { return }
super.touchesMoved(touches, with: event)
}
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
if onTouch(touch) { return }
super.touchesCancelled(touches, with: event)
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
if onTouch(touch) { return }
super.touchesEnded(touches, with: event)
}
private func setupLabel() {
textStorage.addLayoutManager(layoutManager)
layoutManager.addTextContainer(textContainer)
textContainer.lineFragmentPadding = 0
textContainer.lineBreakMode = lineBreakMode
textContainer.maximumNumberOfLines = numberOfLines
isUserInteractionEnabled = true
}
private func parseHTML() { private func parseHTML() {
if _customizing { return } if _customizing { return }
@ -235,8 +144,10 @@ class StatusContentLabel: UILabel {
} }
} }
// MARK: - Text Storage
private func updateTextStorage() { private func updateTextStorage() {
guard !_customizing else { return } if _customizing { return }
guard let attributedText = attributedText, guard let attributedText = attributedText,
attributedText.length > 0 else { attributedText.length > 0 else {
links = [:] links = [:]
@ -252,21 +163,98 @@ class StatusContentLabel: UILabel {
setNeedsDisplay() setNeedsDisplay()
} }
private func addLineBreak(_ attrString: NSAttributedString) -> NSMutableAttributedString { // MARK: - Interaction
let mutAttrString = NSMutableAttributedString(attributedString: attrString)
var range = NSRange(location: 0, length: 0) private func onTouch(_ touch: UITouch) -> Bool {
var attributes = mutAttrString.attributes(at: 0, effectiveRange: &range) let location = touch.location(in: self)
var avoidSuperCall = false
let paragraphStyle = attributes[.paragraphStyle] as? NSMutableParagraphStyle ?? NSMutableParagraphStyle() switch touch.phase {
paragraphStyle.lineBreakMode = .byWordWrapping case .began, .moved:
paragraphStyle.alignment = textAlignment if let link = link(at: location) {
paragraphStyle.lineSpacing = lineSpacing if link.range.location != selectedLink?.range.location || link.range.length != selectedLink?.range.length {
paragraphStyle.minimumLineHeight = minimumLineHeight > 0 ? minimumLineHeight : self.font.pointSize * 1.14 updateAttributesWhenSelected(false)
attributes[.paragraphStyle] = paragraphStyle selectedLink = link
mutAttrString.setAttributes(attributes, range: range) updateAttributesWhenSelected(true)
}
avoidSuperCall = true
} else {
updateAttributesWhenSelected(false)
selectedLink = nil
}
case .ended:
guard let selectedLink = selectedLink else { return avoidSuperCall }
return mutAttrString print("tapped \(selectedLink)")
let when = DispatchTime.now() + Double(Int64(0.25 * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC)
DispatchQueue.main.asyncAfter(deadline: when) {
self.updateAttributesWhenSelected(false)
self.selectedLink = nil
}
case .cancelled:
updateAttributesWhenSelected(false)
selectedLink = nil
case .stationary:
break
}
return avoidSuperCall
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
if onTouch(touch) { return }
super.touchesBegan(touches, with: event)
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
if onTouch(touch) { return }
super.touchesMoved(touches, with: event)
}
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
if onTouch(touch) { return }
super.touchesCancelled(touches, with: event)
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
guard let touch = touches.first else { return }
if onTouch(touch) { return }
super.touchesEnded(touches, with: event)
}
private func link(at location: CGPoint) -> (range: NSRange, url: URL)? {
guard textStorage.length > 0 else { return nil }
let boundingRect = layoutManager.boundingRect(forGlyphRange: NSRange(location: 0, length: textStorage.length), in: textContainer)
guard boundingRect.contains(location) else {
return nil
}
let index = layoutManager.glyphIndex(for: location, in: textContainer)
for (range, url) in links {
if index >= range.location && index <= range.location + range.length {
return (range, url)
}
}
return nil
}
private func updateAttributesWhenSelected(_ isSelected: Bool) {
guard let selectedLink = selectedLink else { return }
var attributes = textStorage.attributes(at: 0, effectiveRange: nil)
attributes[.foregroundColor] = isSelected ? nil : UIColor.blue
textStorage.addAttributes(attributes, range: selectedLink.range)
setNeedsDisplay()
} }
} }

View File

@ -50,93 +50,8 @@ class StatusTableViewCell: UITableViewCell {
} }
contentLabel.text = status.content contentLabel.text = status.content
// let doc = try! SwiftSoup.parse(status.content)
// let body = doc.body()!
//// print("---")
//// print(status.content)
//// print("---")
//
// let (text, links) = attributedTextForNode(body)
// self.links = links
// contentLabel.attributedText = text
// contentLabel.isUserInteractionEnabled = true
// contentLabel.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTapOnContentLabel(_:))))
//
// // https://stackoverflow.com/a/28519273/4731558
// layoutManager = NSLayoutManager()
// textContainer = NSTextContainer(size: .zero)
// textStorage = NSTextStorage(attributedString: text)
//
// layoutManager.addTextContainer(textContainer)
// textStorage.addLayoutManager(layoutManager)
//
// textContainer.lineFragmentPadding = 0
// textContainer.lineBreakMode = contentLabel.lineBreakMode
// textContainer.maximumNumberOfLines = contentLabel.numberOfLines
} }
// func attributedTextForNode(_ node: Node) -> (NSAttributedString, [NSRange: URL]) {
// switch node {
// case let node as TextNode:
// return (NSAttributedString(string: node.text()), [:])
// case let node as Element:
// var links = [NSRange: URL]()
// let attributed = NSMutableAttributedString()
// node.getChildNodes().forEach { child in
// let (text, childLinks) = attributedTextForNode(child)
// childLinks.forEach { range, url in
// let newRange = NSRange(location: range.location + attributed.length, length: range.length)
// links[newRange] = url
// }
// attributed.append(text)
// }
//
// switch node.tagName() {
// case "br":
// attributed.append(NSAttributedString(string: "\n"))
// case "a":
// if let link = try? node.attr("href"),
// let url = URL(string: link) {
// let linkRange = NSRange(location: 0, length: attributed.length)
// let linkAttributes: [NSAttributedString.Key: Any] = [
// .foregroundColor: UIColor.blue
// ]
// attributed.setAttributes(linkAttributes, range: linkRange)
//
// links[linkRange] = url
// }
// default:
// break
// }
//
// return (attributed, links)
// default:
// fatalError("Unexpected node type: \(type(of: node))")
// }
// }
// @objc func handleTapOnContentLabel(_ tapGesture: UITapGestureRecognizer) {
// guard let view = tapGesture.view else { fatalError() }
//
// let locationOfTouchInLabel = tapGesture.location(in: view)
// let labelSize = view.bounds.size
// let textBoundingBox = layoutManager.usedRect(for: textContainer)
// let textContainerOffset = CGPoint(x: (labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x,
// y: (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y)
// let locationOfTouchInTextContainer = CGPoint(x: locationOfTouchInLabel.x - textContainerOffset.x,
// y: locationOfTouchInLabel.y - textContainerOffset.y)
// let indexOfCharacter = layoutManager.characterIndex(for: locationOfTouchInTextContainer, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
//
// let link = links.first { (range, _) -> Bool in
// range.contains(indexOfCharacter)
// }
//
// if let (_, url) = link {
// print("Open URL: \(url)")
// }
// }
override func prepareForReuse() { override func prepareForReuse() {
if let url = avatarURL { if let url = avatarURL {
AvatarCache.shared.cancel(url) AvatarCache.shared.cancel(url)