58 lines
2.0 KiB
Swift
58 lines
2.0 KiB
Swift
//
|
|
// Copyright 2019 Signal Messenger, LLC
|
|
// SPDX-License-Identifier: AGPL-3.0-only
|
|
//
|
|
|
|
import Foundation
|
|
import UIKit
|
|
|
|
class AttachmentTextView: MentionTextView {
|
|
|
|
required init() {
|
|
super.init()
|
|
updateTextContainerInset()
|
|
}
|
|
|
|
required public init?(coder: NSCoder) {
|
|
fatalError("init(coder:) has not been implemented")
|
|
}
|
|
|
|
private var textIsChanging = false
|
|
|
|
override func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
|
|
textIsChanging = true
|
|
return super.textView(self, shouldChangeTextIn: range, replacementText: text)
|
|
}
|
|
|
|
override func textViewDidChange(_ textView: UITextView) {
|
|
super.textViewDidChange(textView)
|
|
textIsChanging = false
|
|
}
|
|
|
|
override func setContentOffset(_ contentOffset: CGPoint, animated: Bool) {
|
|
// When creating new lines, contentOffset is animated, but because because
|
|
// we are simultaneously resizing the text view, on pre-iOS 13 this can
|
|
// cause the text in the textview to be "too high" in the text view.
|
|
// Solution is to disable animation for setting content offset between
|
|
// -textViewShouldChange... and -textViewDidChange.
|
|
//
|
|
// We can't unilaterally disable *all* animated scrolling because that breaks
|
|
// manipulation of the cursor in scrollable text. Animation is required to
|
|
// slow the text view scrolling down to human scale when the cursor reaches
|
|
// the top or bottom edge.
|
|
let shouldAnimate: Bool
|
|
if #available(iOS 13, *) {
|
|
shouldAnimate = animated
|
|
} else {
|
|
shouldAnimate = animated && !textIsChanging
|
|
}
|
|
super.setContentOffset(contentOffset, animated: shouldAnimate)
|
|
}
|
|
|
|
private func updateTextContainerInset() {
|
|
textContainerInset.left = 7
|
|
textContainerInset.right = 7
|
|
updateVerticalInsetsForDynamicBodyType(defaultInsets: 6 - CGHairlineWidth())
|
|
}
|
|
}
|