mirror of https://github.com/oxen-io/session-ios
Merge branch 'mkirk/pager-rail-style' into release/2.32.0
Michael Kirk
7 years ago
commit
a60dc2bfe7
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//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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public protocol CaptionContainerViewDelegate: class {
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func captionContainerViewDidUpdateText(_ captionContainerView: CaptionContainerView)
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}
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public class CaptionContainerView: UIView {
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weak var delegate: CaptionContainerViewDelegate?
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var currentText: String? {
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get { return currentCaptionView.text }
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set {
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currentCaptionView.text = newValue
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delegate?.captionContainerViewDidUpdateText(self)
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}
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}
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var pendingText: String? {
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get { return pendingCaptionView.text }
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set {
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pendingCaptionView.text = newValue
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delegate?.captionContainerViewDidUpdateText(self)
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}
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}
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func updatePagerTransition(ratioComplete: CGFloat) {
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if let currentText = self.currentText, currentText.count > 1 {
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currentCaptionView.alpha = 1 - ratioComplete
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} else {
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currentCaptionView.alpha = 0
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}
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if let pendingText = self.pendingText, pendingText.count > 1 {
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pendingCaptionView.alpha = ratioComplete
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} else {
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pendingCaptionView.alpha = 0
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}
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}
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func completePagerTransition() {
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updatePagerTransition(ratioComplete: 1)
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// promote "pending" to "current" caption view.
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let oldCaptionView = self.currentCaptionView
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self.currentCaptionView = self.pendingCaptionView
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self.pendingCaptionView = oldCaptionView
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self.pendingText = nil
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}
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// MARK: Initializers
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override init(frame: CGRect) {
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super.init(frame: frame)
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setContentHuggingHigh()
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setCompressionResistanceHigh()
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addSubview(currentCaptionView)
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currentCaptionView.autoPinEdgesToSuperviewEdges(with: .zero, excludingEdge: .top)
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currentCaptionView.autoPinEdge(toSuperviewEdge: .top, withInset: 0, relation: .greaterThanOrEqual)
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pendingCaptionView.alpha = 0
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addSubview(pendingCaptionView)
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pendingCaptionView.autoPinEdgesToSuperviewEdges(with: .zero, excludingEdge: .top)
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pendingCaptionView.autoPinEdge(toSuperviewEdge: .top, withInset: 0, relation: .greaterThanOrEqual)
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}
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required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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// MARK: Subviews
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private var pendingCaptionView: CaptionView = CaptionView()
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private var currentCaptionView: CaptionView = CaptionView()
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}
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private class CaptionView: UIView {
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var text: String? {
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get { return textView.text }
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set {
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if let captionText = newValue, captionText.count > 0 {
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textView.text = captionText
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} else {
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textView.text = nil
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}
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}
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}
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// MARK: Subviews
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let textView: CaptionTextView = {
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let textView = CaptionTextView()
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textView.font = UIFont.ows_dynamicTypeBody
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textView.textColor = .white
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textView.backgroundColor = .clear
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textView.isEditable = false
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textView.isSelectable = false
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return textView
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}()
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let scrollFadeView = GradientView(from: .clear, to: .black)
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// MARK: Initializers
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override init(frame: CGRect) {
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super.init(frame: frame)
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addSubview(textView)
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textView.autoPinEdgesToSuperviewMargins()
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addSubview(scrollFadeView)
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scrollFadeView.autoPinEdgesToSuperviewEdges(with: .zero, excludingEdge: .top)
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scrollFadeView.autoSetDimension(.height, toSize: 20)
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}
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required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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// MARK: UIView overrides
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override func layoutSubviews() {
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super.layoutSubviews()
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scrollFadeView.isHidden = !textView.doesContentNeedScroll
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}
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// MARK: -
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class CaptionTextView: UITextView {
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var kMaxHeight: CGFloat = ScaleFromIPhone5(200)
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override var text: String! {
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didSet {
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invalidateIntrinsicContentSize()
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}
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}
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override var font: UIFont? {
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didSet {
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invalidateIntrinsicContentSize()
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}
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}
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var doesContentNeedScroll: Bool {
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return self.bounds.height == kMaxHeight
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}
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override func layoutSubviews() {
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super.layoutSubviews()
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// Enable/disable scrolling depending on wether we've clipped
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// content in `intrinsicContentSize`
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if doesContentNeedScroll {
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if !isScrollEnabled {
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isScrollEnabled = true
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}
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} else if isScrollEnabled {
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isScrollEnabled = false
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}
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}
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override var intrinsicContentSize: CGSize {
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var size = super.intrinsicContentSize
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if size.height == UIViewNoIntrinsicMetric {
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size.height = layoutManager.usedRect(for: textContainer).height + textContainerInset.top + textContainerInset.bottom
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}
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size.height = min(kMaxHeight, size.height)
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return size
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}
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}
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}
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