97 lines
3.5 KiB
Swift
97 lines
3.5 KiB
Swift
//
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// UITextView+Search.swift
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// Passepartout-iOS
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//
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// Created by Davide De Rosa on 8/1/18.
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// Copyright (c) 2019 Davide De Rosa. All rights reserved.
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//
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// https://github.com/passepartoutvpn
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//
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// This file is part of Passepartout.
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//
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// Passepartout is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Passepartout is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Passepartout. If not, see <http://www.gnu.org/licenses/>.
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//
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import UIKit
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extension UITextView {
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func firstVisibleIndex() -> Int {
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let endOffset = contentOffset
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let end = closestPosition(to: endOffset) ?? beginningOfDocument
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return offset(from: beginningOfDocument, to: end)
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}
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func lastVisibleIndex() -> Int {
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let startOffset = CGPoint(
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x: contentOffset.x + frame.size.width,
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y: contentOffset.y + frame.size.height
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)
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let start = closestPosition(to: startOffset) ?? endOfDocument
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return offset(from: beginningOfDocument, to: start)
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}
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func findPrevious(string: String) {
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let last = text.index(text.startIndex, offsetBy: firstVisibleIndex())
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let context = text.startIndex..<last
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guard let found = text.range(of: string, options: .backwards, range: context) else {
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scrollToBegin()
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return
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}
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let nsRange = text.nsRange(from: found)
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// log.debug(">>> found: \(nsRange)")
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scrollRangeToVisible(nsRange)
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// scrollRangeToTop(nsRange)
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}
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func findNext(string: String) {
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let first = text.index(text.startIndex, offsetBy: lastVisibleIndex())
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let context = first..<text.endIndex
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guard let found = text.range(of: string, range: context) else {
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scrollToEnd()
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return
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}
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let nsRange = text.nsRange(from: found)
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// log.debug(">>> found: \(nsRange)")
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scrollRangeToVisible(nsRange)
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// scrollRangeToTop(nsRange)
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}
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func scrollRangeToTop(_ nsRange: NSRange) {
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let start = position(from: beginningOfDocument, offset: nsRange.location) ?? beginningOfDocument
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let end = position(from: start, offset: nsRange.length) ?? endOfDocument
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guard let range = textRange(from: start, to: end) else {
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return
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}
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let target = convert(firstRect(for: range), to: textInputView)
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setContentOffset(target.origin, animated: true)
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}
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// func scrollRangeToTop(_ range: NSRange) {
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// let glyphRange = layoutManager.glyphRange(forCharacterRange: range, actualCharacterRange: nil)
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// let rect = layoutManager.boundingRect(forGlyphRange: glyphRange, in: textContainer)
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// let topTextInset = textContainerInset.top
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// let target = CGPoint(x: 0, y: topTextInset + rect.origin.y)
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// setContentOffset(target, animated: true)
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// log.debug(">>> target: \(target)")
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// }
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func scrollToBegin() {
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scrollRangeToVisible(NSMakeRange(0, 1))
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}
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func scrollToEnd() {
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scrollRangeToVisible(NSMakeRange(text.count - 1, 1))
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}
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}
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