| 1 | import Foundation |
| 2 | #if os(macOS) |
| 3 | import AppKit |
| 4 | |
| 5 | @MainActor class DocsPagedTextView: NSTextView { |
| 6 | var paged = false { didSet { if oldValue != paged { needsLayout = true; needsDisplay = true } } } |
| 7 | private var updatingGeometry = false |
| 8 | private var updatingPagination = false |
| 9 | private var separators: [CGFloat] = [] |
| 10 | private var measuredRevision: UInt64? |
| 11 | private var measuredWidth: CGFloat = 0 |
| 12 | private var measuredPaged = false |
| 13 | private var measuredContent: NSAttributedString? |
| 14 | func invalidatePagination() { |
| 15 | measuredRevision = nil |
| 16 | // TextKit may ask for caret geometry before the next NSView layout. |
| 17 | // Prepare the complete page plan now, on an independent layout stack. |
| 18 | if !updatingGeometry { updatePagination() } |
| 19 | needsLayout = true |
| 20 | } |
| 21 | override init(frame frameRect: NSRect, textContainer container: NSTextContainer?) { |
| 22 | let storage = NSTextStorage() |
| 23 | let manager = DocsLayoutManager() |
| 24 | manager.usesFontLeading = false |
| 25 | let pages = DocsPageTextContainer(size: CGSize(width: max(320, frameRect.width), height: 1_000_000)) |
| 26 | pages.lineFragmentPadding = 0 |
| 27 | storage.addLayoutManager(manager) |
| 28 | manager.addTextContainer(pages) |
| 29 | super.init(frame: frameRect, textContainer: pages) |
| 30 | textContainerInset = .zero |
| 31 | // This view owns its paginated height; NSTextView auto-sizing uses a |
| 32 | // different used rect and briefly clips the current line during input. |
| 33 | isVerticallyResizable = false |
| 34 | isHorizontallyResizable = false |
| 35 | drawsBackground = true |
| 36 | textColor = .black |
| 37 | } |
| 38 | override convenience init(frame: NSRect) { self.init(frame: frame, textContainer: nil) } |
| 39 | required init?(coder: NSCoder) { fatalError("init(coder:) is unavailable") } |
| 40 | // Page margins are already part of DocsPageTextContainer's line geometry. |
| 41 | // NSTextView's inferred origin moves during incremental layout and can put |
| 42 | // its native insertion indicator at a different origin from the glyphs. |
| 43 | override var textContainerOrigin: NSPoint { .zero } |
| 44 | override func didChangeText() { |
| 45 | // Size the document before AppKit scrolls the newly edited caret. |
| 46 | needsLayout = true |
| 47 | layoutSubtreeIfNeeded() |
| 48 | super.didChangeText() |
| 49 | } |
| 50 | private var viewportWidth: CGFloat { max(636, enclosingScrollView?.contentView.bounds.width ?? bounds.width) } |
| 51 | private func updatePagination() { |
| 52 | guard !updatingPagination else { return } |
| 53 | updatingPagination = true |
| 54 | defer { updatingPagination = false } |
| 55 | guard let pages = textContainer as? DocsPageTextContainer, |
| 56 | let manager = layoutManager as? DocsLayoutManager, let storage = textStorage else { return } |
| 57 | let width = viewportWidth |
| 58 | let size = CGSize(width: width, height: 1_000_000) |
| 59 | if pages.size != size { pages.size = size } |
| 60 | pages.geometry = DocsPageGeometry(viewportWidth: width, paged: false) |
| 61 | let revision = manager.storageRevision |
| 62 | guard measuredRevision != revision || measuredWidth != width || measuredPaged != paged else { return } |
| 63 | let content = paged ? DocumentPageLayout.measurementContent(storage) : nil |
| 64 | if measuredWidth == width, measuredPaged == paged, let content, measuredContent?.isEqual(to: content) == true { |
| 65 | measuredRevision = revision |
| 66 | return |
| 67 | } |
| 68 | var plan = DocumentPageLayout.Result() |
| 69 | if let content { |
| 70 | // Never clear the live container to measure unpaginated content: doing |
| 71 | // so exposes a second set of caret/scroll coordinates during edits. |
| 72 | let measurement = NSTextStorage(attributedString: content) |
| 73 | let measurementManager = DocsLayoutManager() |
| 74 | let measurementContainer = DocsPageTextContainer(size: size) |
| 75 | measurementContainer.lineFragmentPadding = 0 |
| 76 | measurementContainer.geometry = pages.geometry |
| 77 | measurement.addLayoutManager(measurementManager) |
| 78 | measurementManager.addTextContainer(measurementContainer) |
| 79 | measurementManager.ensureLayout(for: measurementContainer) |
| 80 | plan = DocumentPageLayout.measure(storage: measurement, manager: measurementManager, container: measurementContainer) |
| 81 | } |
| 82 | if pages.blockStarts != plan.starts || separators != plan.separators { needsDisplay = true } |
| 83 | pages.blockStarts = plan.starts |
| 84 | separators = plan.separators |
| 85 | measuredRevision = revision; measuredWidth = width; measuredPaged = paged |
| 86 | measuredContent = content |
| 87 | } |
| 88 | override func layout() { |
| 89 | guard !updatingGeometry, let pages = textContainer as? DocsPageTextContainer, |
| 90 | let manager = layoutManager else { return } |
| 91 | updatingGeometry = true |
| 92 | defer { updatingGeometry = false } |
| 93 | updatePagination() |
| 94 | // AppKit must only lay out the caret after final page coordinates exist. |
| 95 | super.layout() |
| 96 | manager.ensureLayout(for: pages) |
| 97 | let width = viewportWidth |
| 98 | let bottom = manager.numberOfGlyphs > 0 |
| 99 | ? manager.lineFragmentRect(forGlyphAt: manager.numberOfGlyphs - 1, effectiveRange: nil).maxY : DocsPageGeometry.verticalMargin |
| 100 | let height = pages.geometry.documentHeight(usedHeight: bottom) |
| 101 | if abs(frame.width - width) > 0.5 || abs(frame.height - height) > 0.5 { |
| 102 | setFrameSize(CGSize(width: width, height: height)) |
| 103 | } |
| 104 | } |
| 105 | override func drawBackground(in dirtyRect: NSRect) { |
| 106 | NSGraphicsContext.saveGraphicsState() |
| 107 | defer { NSGraphicsContext.restoreGraphicsState() } |
| 108 | dirtyRect.clip() |
| 109 | NSColor.windowBackgroundColor.setFill() |
| 110 | dirtyRect.fill() |
| 111 | if let pages = textContainer as? DocsPageTextContainer { |
| 112 | let geometry = pages.geometry |
| 113 | NSColor.white.setFill() |
| 114 | CGRect(x: geometry.paperX, y: 0, width: geometry.paperWidth, height: bounds.height).fill() |
| 115 | if paged { |
| 116 | for (index, y) in separators.enumerated() where y + 18 >= dirtyRect.minY && y <= dirtyRect.maxY { |
| 117 | NSColor.windowBackgroundColor.setFill() |
| 118 | CGRect(x: geometry.paperX, y: y, width: geometry.paperWidth, height: 18).fill() |
| 119 | let label = String(localized: "docs.editor.page.number", bundle: DocsResources.bundle) |
| 120 | .replacingOccurrences(of: "{n}", with: String(index + 2)) |
| 121 | (label as NSString).draw(at: CGPoint(x: geometry.paperX + geometry.paperWidth - 80, y: y + 3), |
| 122 | withAttributes: [.font: NSFont.systemFont(ofSize: 10), .foregroundColor: NSColor.darkGray]) |
| 123 | } |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | #else |
| 129 | import UIKit |
| 130 | |
| 131 | @MainActor class DocsPagedTextView: UITextView { |
| 132 | var paged = false { didSet { if oldValue != paged { setNeedsLayout(); setNeedsDisplay() } } } |
| 133 | private var updatingGeometry = false |
| 134 | override init(frame: CGRect = .zero, textContainer: NSTextContainer? = nil) { |
| 135 | let storage = NSTextStorage() |
| 136 | let manager = NSLayoutManager() |
| 137 | manager.usesFontLeading = false |
| 138 | let pages = DocsPageTextContainer(size: CGSize(width: max(320, frame.width), height: 1_000_000)) |
| 139 | pages.lineFragmentPadding = 0 |
| 140 | storage.addLayoutManager(manager) |
| 141 | manager.addTextContainer(pages) |
| 142 | super.init(frame: frame, textContainer: pages) |
| 143 | textContainerInset = .zero |
| 144 | backgroundColor = .clear |
| 145 | textColor = .black |
| 146 | isOpaque = false |
| 147 | } |
| 148 | required init?(coder: NSCoder) { fatalError("init(coder:) is unavailable") } |
| 149 | override func layoutSubviews() { |
| 150 | super.layoutSubviews() |
| 151 | guard !updatingGeometry, let pages = textContainer as? DocsPageTextContainer else { return } |
| 152 | updatingGeometry = true |
| 153 | defer { updatingGeometry = false } |
| 154 | let width = max(160, bounds.width) |
| 155 | let size = CGSize(width: width, height: 1_000_000) |
| 156 | if pages.size != size { pages.size = size } |
| 157 | pages.geometry = DocsPageGeometry(viewportWidth: width, paged: paged) |
| 158 | layoutManager.ensureLayout(for: pages) |
| 159 | let height = pages.geometry.documentHeight(usedHeight: layoutManager.usedRect(for: pages).maxY) |
| 160 | if abs(contentSize.height - height) > 0.5 || abs(contentSize.width - width) > 0.5 { |
| 161 | contentSize = CGSize(width: width, height: height) |
| 162 | } |
| 163 | setNeedsDisplay() |
| 164 | } |
| 165 | override func draw(_ rect: CGRect) { |
| 166 | UIColor.systemGroupedBackground.setFill() |
| 167 | UIRectFill(rect) |
| 168 | if let pages = textContainer as? DocsPageTextContainer { |
| 169 | let geometry = pages.geometry |
| 170 | if paged { |
| 171 | for page in geometry.page(at: rect.minY)...geometry.page(at: rect.maxY) { |
| 172 | UIColor.white.setFill() |
| 173 | UIRectFill(geometry.pageRect(page)) |
| 174 | let label = String(localized: "docs.editor.page.number", bundle: DocsResources.bundle) |
| 175 | .replacingOccurrences(of: "{n}", with: String(page + 1)) |
| 176 | (label as NSString).draw(at: CGPoint(x: geometry.paperX + geometry.paperWidth - 80, |
| 177 | y: CGFloat(page) * geometry.stride + DocsPageGeometry.paperHeight - 35), |
| 178 | withAttributes: [.font: UIFont.systemFont(ofSize: 10), .foregroundColor: UIColor.darkGray]) |
| 179 | } |
| 180 | } else { |
| 181 | UIColor.white.setFill() |
| 182 | UIRectFill(CGRect(x: geometry.paperX, y: 0, width: geometry.paperWidth, height: max(bounds.height, contentSize.height))) |
| 183 | } |
| 184 | } |
| 185 | super.draw(rect) |
| 186 | } |
| 187 | } |
| 188 | #endif |
| 189 | |
amadan