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| 1 | +// |
| 2 | +// DraggingTextRenderer.swift |
| 3 | +// CodeEditTextView |
| 4 | +// |
| 5 | +// Created by Khan Winter on 11/24/24. |
| 6 | +// |
| 7 | + |
| 8 | +import AppKit |
| 9 | + |
| 10 | +class DraggingTextRenderer: NSView { |
| 11 | + let ranges: [NSRange] |
| 12 | + let layoutManager: TextLayoutManager |
| 13 | + |
| 14 | + override var isFlipped: Bool { |
| 15 | + true |
| 16 | + } |
| 17 | + |
| 18 | + override var intrinsicContentSize: NSSize { |
| 19 | + self.frame.size |
| 20 | + } |
| 21 | + |
| 22 | + init?(ranges: [NSRange], layoutManager: TextLayoutManager) { |
| 23 | + self.ranges = ranges |
| 24 | + self.layoutManager = layoutManager |
| 25 | + |
| 26 | + assert(!ranges.isEmpty, "Empty ranges not allowed") |
| 27 | + |
| 28 | + var minY: CGFloat = .infinity |
| 29 | + var maxY: CGFloat = 0.0 |
| 30 | + |
| 31 | + for range in ranges { |
| 32 | + for line in layoutManager.lineStorage.linesInRange(range) { |
| 33 | + minY = min(minY, line.yPos) |
| 34 | + maxY = max(maxY, line.yPos + line.height) |
| 35 | + } |
| 36 | + } |
| 37 | + |
| 38 | + let frame = CGRect( |
| 39 | + x: layoutManager.edgeInsets.left, |
| 40 | + y: minY, |
| 41 | + width: layoutManager.maxLineWidth, |
| 42 | + height: maxY - minY |
| 43 | + ) |
| 44 | + |
| 45 | + super.init(frame: frame) |
| 46 | + } |
| 47 | + |
| 48 | + required init?(coder: NSCoder) { |
| 49 | + fatalError("init(coder:) has not been implemented") |
| 50 | + } |
| 51 | + |
| 52 | + override func draw(_ dirtyRect: NSRect) { |
| 53 | + super.draw(dirtyRect) |
| 54 | + guard let context = NSGraphicsContext.current?.cgContext, |
| 55 | + let firstRange = ranges.first, |
| 56 | + let minRect = layoutManager.rectForOffset(firstRange.lowerBound) else { |
| 57 | + return |
| 58 | + } |
| 59 | + |
| 60 | + for range in ranges { |
| 61 | + for line in layoutManager.lineStorage.linesInRange(range) { |
| 62 | + drawLine(line, in: range, yOffset: minRect.minY, context: context) |
| 63 | + } |
| 64 | + } |
| 65 | + } |
| 66 | + |
| 67 | + private func drawLine( |
| 68 | + _ line: TextLineStorage<TextLine>.TextLinePosition, |
| 69 | + in selectedRange: NSRange, |
| 70 | + yOffset: CGFloat, |
| 71 | + context: CGContext |
| 72 | + ) { |
| 73 | + for fragment in line.data.lineFragments { |
| 74 | + guard let fragmentRange = fragment.range.shifted(by: line.range.location), |
| 75 | + fragmentRange.intersection(selectedRange) != nil else { |
| 76 | + continue |
| 77 | + } |
| 78 | + let fragmentYPos = line.yPos + fragment.yPos - yOffset |
| 79 | + fragment.data.draw(in: context, yPos: fragmentYPos) |
| 80 | + |
| 81 | + // Clear text that's not selected |
| 82 | + if fragmentRange.contains(selectedRange.lowerBound) { |
| 83 | + let relativeOffset = selectedRange.lowerBound - line.range.lowerBound |
| 84 | + let selectionXPos = fragment.data.xPos(for: relativeOffset) |
| 85 | + context.clear( |
| 86 | + CGRect( |
| 87 | + x: 0.0, |
| 88 | + y: fragmentYPos, |
| 89 | + width: selectionXPos, |
| 90 | + height: fragment.height |
| 91 | + ).pixelAligned |
| 92 | + ) |
| 93 | + } |
| 94 | + |
| 95 | + if fragmentRange.contains(selectedRange.upperBound) { |
| 96 | + let relativeOffset = selectedRange.upperBound - line.range.lowerBound |
| 97 | + let selectionXPos = fragment.data.xPos(for: relativeOffset) |
| 98 | + context.clear( |
| 99 | + CGRect( |
| 100 | + x: selectionXPos, |
| 101 | + y: fragmentYPos, |
| 102 | + width: frame.width - selectionXPos, |
| 103 | + height: fragment.height |
| 104 | + ).pixelAligned |
| 105 | + ) |
| 106 | + } |
| 107 | + } |
| 108 | + } |
| 109 | +} |
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