mirror of https://github.com/oxen-io/session-ios
Rework attachment captioning.
Matthew Chen
6 years ago
parent
625656deb9
commit
d80f086f31
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//
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// Copyright (c) 2019 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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import UIKit
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protocol AttachmentCaptionToolbarDelegate: class {
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func attachmentCaptionToolbarDidEdit(_ attachmentCaptionToolbar: AttachmentCaptionToolbar)
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}
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// MARK: -
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class AttachmentCaptionToolbar: UIView, UITextViewDelegate {
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private let kMaxCaptionCharacterCount = 240
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weak var attachmentCaptionToolbarDelegate: AttachmentCaptionToolbarDelegate?
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var messageText: String? {
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get { return textView.text }
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set {
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textView.text = newValue
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}
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}
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// Layout Constants
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let kMinTextViewHeight: CGFloat = 38
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var maxTextViewHeight: CGFloat {
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// About ~4 lines in portrait and ~3 lines in landscape.
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// Otherwise we risk obscuring too much of the content.
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return UIDevice.current.orientation.isPortrait ? 160 : 100
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}
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var textViewHeightConstraint: NSLayoutConstraint!
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var textViewHeight: CGFloat
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// MARK: - Initializers
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init() {
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self.textViewHeight = kMinTextViewHeight
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super.init(frame: CGRect.zero)
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// Specifying autorsizing mask and an intrinsic content size allows proper
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// sizing when used as an input accessory view.
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self.autoresizingMask = .flexibleHeight
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self.translatesAutoresizingMaskIntoConstraints = false
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self.backgroundColor = UIColor.clear
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textView.delegate = self
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// Layout
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let kToolbarMargin: CGFloat = 8
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self.textViewHeightConstraint = textView.autoSetDimension(.height, toSize: kMinTextViewHeight)
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lengthLimitLabel.setContentHuggingHigh()
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lengthLimitLabel.setCompressionResistanceHigh()
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let contentView = UIStackView(arrangedSubviews: [textContainer, lengthLimitLabel])
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// We have to wrap the toolbar items in a content view because iOS (at least on iOS10.3) assigns the inputAccessoryView.layoutMargins
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// when resigning first responder (verified by auditing with `layoutMarginsDidChange`).
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// The effect of this is that if we were to assign these margins to self.layoutMargins, they'd be blown away if the
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// user dismisses the keyboard, giving the input accessory view a wonky layout.
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contentView.layoutMargins = UIEdgeInsets(top: kToolbarMargin, left: kToolbarMargin, bottom: kToolbarMargin, right: kToolbarMargin)
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contentView.axis = .vertical
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addSubview(contentView)
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contentView.autoPinEdgesToSuperviewEdges()
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}
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required init?(coder aDecoder: NSCoder) {
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notImplemented()
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}
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// MARK: - UIView Overrides
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override var intrinsicContentSize: CGSize {
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get {
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// Since we have `self.autoresizingMask = UIViewAutoresizingFlexibleHeight`, we must specify
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// an intrinsicContentSize. Specifying CGSize.zero causes the height to be determined by autolayout.
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return CGSize.zero
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}
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}
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// MARK: - Subviews
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private lazy var lengthLimitLabel: UILabel = {
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let lengthLimitLabel = UILabel()
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// Length Limit Label shown when the user inputs too long of a message
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lengthLimitLabel.textColor = .white
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lengthLimitLabel.text = NSLocalizedString("ATTACHMENT_APPROVAL_MESSAGE_LENGTH_LIMIT_REACHED", comment: "One-line label indicating the user can add no more text to the media message field.")
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lengthLimitLabel.textAlignment = .center
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// Add shadow in case overlayed on white content
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lengthLimitLabel.layer.shadowColor = UIColor.black.cgColor
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lengthLimitLabel.layer.shadowOffset = .zero
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lengthLimitLabel.layer.shadowOpacity = 0.8
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lengthLimitLabel.layer.shadowRadius = 2.0
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lengthLimitLabel.isHidden = true
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return lengthLimitLabel
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}()
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lazy var textView: UITextView = {
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let textView = buildTextView()
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textView.returnKeyType = .done
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textView.scrollIndicatorInsets = UIEdgeInsets(top: 5, left: 0, bottom: 5, right: 3)
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return textView
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}()
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private lazy var textContainer: UIView = {
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let textContainer = UIView()
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textContainer.clipsToBounds = true
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textContainer.addSubview(textView)
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textView.autoPinEdgesToSuperviewEdges()
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return textContainer
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}()
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private func buildTextView() -> UITextView {
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let textView = AttachmentTextView()
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textView.keyboardAppearance = Theme.darkThemeKeyboardAppearance
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textView.backgroundColor = .clear
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textView.tintColor = Theme.darkThemePrimaryColor
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textView.font = UIFont.ows_dynamicTypeBody
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textView.textColor = Theme.darkThemePrimaryColor
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textView.textContainerInset = UIEdgeInsets(top: 7, left: 7, bottom: 7, right: 7)
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return textView
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}
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// MARK: - UITextViewDelegate
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public func textViewDidChange(_ textView: UITextView) {
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updateHeight(textView: textView)
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attachmentCaptionToolbarDelegate?.attachmentCaptionToolbarDidEdit(self)
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}
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public func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
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if !FeatureFlags.sendingMediaWithOversizeText {
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let existingText: String = textView.text ?? ""
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let proposedText: String = (existingText as NSString).replacingCharacters(in: range, with: text)
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// Don't complicate things by mixing media attachments with oversize text attachments
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guard proposedText.utf8.count < kOversizeTextMessageSizeThreshold else {
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Logger.debug("long text was truncated")
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self.lengthLimitLabel.isHidden = false
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// `range` represents the section of the existing text we will replace. We can re-use that space.
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// Range is in units of NSStrings's standard UTF-16 characters. Since some of those chars could be
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// represented as single bytes in utf-8, while others may be 8 or more, the only way to be sure is
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// to just measure the utf8 encoded bytes of the replaced substring.
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let bytesAfterDelete: Int = (existingText as NSString).replacingCharacters(in: range, with: "").utf8.count
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// Accept as much of the input as we can
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let byteBudget: Int = Int(kOversizeTextMessageSizeThreshold) - bytesAfterDelete
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if byteBudget >= 0, let acceptableNewText = text.truncated(toByteCount: UInt(byteBudget)) {
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textView.text = (existingText as NSString).replacingCharacters(in: range, with: acceptableNewText)
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}
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return false
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}
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self.lengthLimitLabel.isHidden = true
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// After verifying the byte-length is sufficiently small, verify the character count is within bounds.
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guard proposedText.count < kMaxCaptionCharacterCount else {
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Logger.debug("hit attachment message body character count limit")
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self.lengthLimitLabel.isHidden = false
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// `range` represents the section of the existing text we will replace. We can re-use that space.
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let charsAfterDelete: Int = (existingText as NSString).replacingCharacters(in: range, with: "").count
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// Accept as much of the input as we can
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let charBudget: Int = Int(kMaxCaptionCharacterCount) - charsAfterDelete
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if charBudget >= 0 {
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let acceptableNewText = String(text.prefix(charBudget))
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textView.text = (existingText as NSString).replacingCharacters(in: range, with: acceptableNewText)
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}
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return false
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}
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}
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// Though we can wrap the text, we don't want to encourage multline captions, plus a "done" button
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// allows the user to get the keyboard out of the way while in the attachment approval view.
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if text == "\n" {
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textView.resignFirstResponder()
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return false
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} else {
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return true
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}
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}
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// MARK: - Helpers
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private func updateHeight(textView: UITextView) {
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// compute new height assuming width is unchanged
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let currentSize = textView.frame.size
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let newHeight = clampedTextViewHeight(fixedWidth: currentSize.width)
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if newHeight != textViewHeight {
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Logger.debug("TextView height changed: \(textViewHeight) -> \(newHeight)")
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textViewHeight = newHeight
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textViewHeightConstraint?.constant = textViewHeight
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invalidateIntrinsicContentSize()
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}
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}
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private func clampedTextViewHeight(fixedWidth: CGFloat) -> CGFloat {
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let contentSize = textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))
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return CGFloatClamp(contentSize.height, kMinTextViewHeight, maxTextViewHeight)
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}
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}
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