320 lines
13 KiB
Swift
320 lines
13 KiB
Swift
//
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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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import SessionUIKit
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// Coincides with Android's max text message length
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let kMaxMessageBodyCharacterCount = 2000
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protocol AttachmentTextToolbarDelegate: class {
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func attachmentTextToolbarDidTapSend(_ attachmentTextToolbar: AttachmentTextToolbar)
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func attachmentTextToolbarDidBeginEditing(_ attachmentTextToolbar: AttachmentTextToolbar)
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func attachmentTextToolbarDidEndEditing(_ attachmentTextToolbar: AttachmentTextToolbar)
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func attachmentTextToolbarDidChange(_ attachmentTextToolbar: AttachmentTextToolbar)
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}
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// MARK: -
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class AttachmentTextToolbar: UIView, UITextViewDelegate {
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weak var attachmentTextToolbarDelegate: AttachmentTextToolbarDelegate?
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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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updatePlaceholderTextViewVisibility()
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}
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}
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// Layout Constants
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let kMinTextViewHeight: CGFloat = 40
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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.sendButton = UIButton(type: .system)
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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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let sendTitle = NSLocalizedString("ATTACHMENT_APPROVAL_SEND_BUTTON", comment: "Label for 'send' button in the 'attachment approval' dialog.")
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sendButton.setTitle(sendTitle, for: .normal)
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sendButton.addTarget(self, action: #selector(didTapSend), for: .touchUpInside)
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sendButton.titleLabel?.font = .boldSystemFont(ofSize: Values.mediumFontSize)
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sendButton.titleLabel?.textAlignment = .center
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sendButton.tintColor = Colors.accent
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// Increase hit area of send button
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sendButton.contentEdgeInsets = UIEdgeInsets(top: 6, left: 8, bottom: 6, right: 8)
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let contentView = UIView()
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contentView.addSubview(sendButton)
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contentView.addSubview(textContainer)
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contentView.addSubview(lengthLimitLabel)
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addSubview(contentView)
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contentView.autoPinEdgesToSuperviewEdges()
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// Layout
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let kToolbarMargin: CGFloat = 8
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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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self.textViewHeightConstraint = textView.autoSetDimension(.height, toSize: kMinTextViewHeight)
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// We pin all three edges explicitly rather than doing something like:
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// textView.autoPinEdges(toSuperviewMarginsExcludingEdge: .right)
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// because that method uses `leading` / `trailing` rather than `left` vs. `right`.
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// So it doesn't work as expected with RTL layouts when we explicitly want something
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// to be on the right side for both RTL and LTR layouts, like with the send button.
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// I believe this is a bug in PureLayout. Filed here: https://github.com/PureLayout/PureLayout/issues/209
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textContainer.autoPinEdge(toSuperviewMargin: .top)
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textContainer.autoPinEdge(toSuperviewMargin: .bottom)
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textContainer.autoPinEdge(toSuperviewMargin: .left)
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sendButton.autoPinEdge(.left, to: .right, of: textContainer, withOffset: kToolbarMargin)
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sendButton.autoPinEdge(.bottom, to: .bottom, of: textContainer, withOffset: -3)
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sendButton.autoPinEdge(toSuperviewMargin: .right)
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sendButton.setContentHuggingHigh()
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sendButton.setCompressionResistanceHigh()
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lengthLimitLabel.autoPinEdge(toSuperviewMargin: .left)
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lengthLimitLabel.autoPinEdge(toSuperviewMargin: .right)
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lengthLimitLabel.autoPinEdge(.bottom, to: .top, of: textContainer, withOffset: -6)
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lengthLimitLabel.setContentHuggingHigh()
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lengthLimitLabel.setCompressionResistanceHigh()
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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 let sendButton: UIButton
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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 placeholderTextView: UITextView = {
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let placeholderTextView = buildTextView()
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placeholderTextView.text = NSLocalizedString("Message", comment: "")
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placeholderTextView.isEditable = false
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return placeholderTextView
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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.layer.borderColor = UIColor.white.cgColor
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textContainer.layer.borderWidth = Values.separatorThickness
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textContainer.layer.cornerRadius = kMinTextViewHeight / 2
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textContainer.clipsToBounds = true
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textContainer.addSubview(placeholderTextView)
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placeholderTextView.autoPinEdgesToSuperviewEdges()
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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 = isLightMode ? .default : .dark
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textView.backgroundColor = .clear
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textView.tintColor = .white
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textView.font = .systemFont(ofSize: Values.mediumFontSize)
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textView.textColor = .white
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textView.showsVerticalScrollIndicator = false
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textView.textContainerInset = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
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return textView
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}
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// MARK: - Actions
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@objc func didTapSend() {
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attachmentTextToolbarDelegate?.attachmentTextToolbarDidTapSend(self)
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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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attachmentTextToolbarDelegate?.attachmentTextToolbarDidChange(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 < kMaxMessageBodyCharacterCount 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(kMaxMessageBodyCharacterCount) - 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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public func textViewDidBeginEditing(_ textView: UITextView) {
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attachmentTextToolbarDelegate?.attachmentTextToolbarDidBeginEditing(self)
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updatePlaceholderTextViewVisibility()
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}
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public func textViewDidEndEditing(_ textView: UITextView) {
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attachmentTextToolbarDelegate?.attachmentTextToolbarDidEndEditing(self)
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updatePlaceholderTextViewVisibility()
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}
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// MARK: - Helpers
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func updatePlaceholderTextViewVisibility() {
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let isHidden: Bool = {
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guard !self.textView.isFirstResponder else {
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return true
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}
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guard let text = self.textView.text else {
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return false
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}
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guard text.count > 0 else {
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return false
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}
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return true
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}()
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placeholderTextView.isHidden = isHidden
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}
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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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