mirror of https://github.com/trudnai/Steve2.git
86 lines
3.4 KiB
Swift
86 lines
3.4 KiB
Swift
//
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// NSLayoutManager-Extension.swift
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// Steve ][
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//
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// Created by Tamas Rudnai on 9/17/19.
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// Copyright © 2019, 2020 Tamas Rudnai. All rights reserved.
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//
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// This file is part of Steve ][ -- The Apple ][ Emulator.
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//
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// Steve ][ 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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// Steve ][ 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 Steve ][. If not, see <https://www.gnu.org/licenses/>.
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//
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import Foundation
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import Cocoa
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import AppKit
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class LayoutManager : NSLayoutManager {
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var text: String? { return textStorage?.string }
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var font: NSFont = NSFont.systemFont(ofSize: NSFont.systemFontSize) {
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didSet {
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guard let text = self.text else { return }
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let textRange = NSMakeRange(0, (text as NSString).length)
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invalidateGlyphs(forCharacterRange: textRange, changeInLength: 0, actualCharacterRange: nil)
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invalidateLayout(forCharacterRange: textRange, actualCharacterRange: nil)
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}
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}
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override func drawBackground(forGlyphRange glyphsToShow: NSRange, at origin: CGPoint) {
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super.drawBackground(forGlyphRange: glyphsToShow, at:origin)
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guard let text = self.text else { return }
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enumerateLineFragments(forGlyphRange: glyphsToShow)
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{ (rect: CGRect, usedRect: CGRect, textContainer: NSTextContainer, glyphRange: NSRange, stop: UnsafeMutablePointer<ObjCBool>) -> Void in
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let characterRange = self.characterRange(forGlyphRange: glyphRange, actualGlyphRange: nil)
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// Draw invisible tab space characters
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let line = (self.text! as NSString).substring(with: characterRange)
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do {
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let expr = try NSRegularExpression(pattern: "\t", options: [])
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expr.enumerateMatches(in: line, options: [.reportProgress], range: NSRange(location: 0, length: line.count))
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{ (result: NSTextCheckingResult?, flags: NSRegularExpression.MatchingFlags, stop: UnsafeMutablePointer<ObjCBool>) in
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if let result = result {
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let range = NSMakeRange(result.range.location + characterRange.location, result.range.length)
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let characterRect = self.boundingRect(forGlyphRange: range, in: textContainer)
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let symbol = "\u{21E5}"
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let attrs = [NSAttributedString.Key.font : self.font]
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let height = (symbol as NSString).size(withAttributes: attrs).height
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symbol.draw(in: characterRect.offsetBy(dx: 1.0, dy: height * 0.5), withAttributes: attrs)
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}
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}
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} catch let error as NSError {
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print(error.localizedDescription)
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}
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}
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}
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}
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