wehub-resource-sync
51 lines
2.6 KiB
Swift
51 lines
2.6 KiB
Swift
import AppKit
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// MARK: - Content width (centered reading column)
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//
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// The text column has a physical maximum width (set in cm in Settings and
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// converted to points using the display's real PPI). Windows wider than the
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// cap get symmetric side margins that center the column; narrower windows
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// fill edge-to-edge as usual. This is CSS `max-width` semantics: the cap is
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// an absolute physical size, not a fraction of the window or the screen, so
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// the column doesn't widen when you make the window bigger.
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extension EditorTextView {
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/// Padding applied on each side of the text column at all window sizes.
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static let contentBaseInset: CGFloat = 24
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/// The symmetric horizontal inset for a given view width and max-column width.
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/// `maxContentWidth == .greatestFiniteMagnitude` → base inset only (fills the window).
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/// When the window is too narrow to fit `maxContentWidth`, the column also fills.
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public static func horizontalInset(viewWidth: CGFloat, maxContentWidth: CGFloat) -> CGFloat {
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let available = viewWidth - 2 * contentBaseInset
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guard available > maxContentWidth else { return contentBaseInset }
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return contentBaseInset + (available - maxContentWidth) / 2
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}
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/// Recomputes the horizontal text inset from the current bounds + max-column cap,
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/// preserving the vertical inset. Usually no recompose — only the inset
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/// changes and TextKit 2 reflows wrapped text on its own. The exception is
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/// image overlays: their scaled-to-fit size is baked into the styled
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/// attribute at render time (§4 fragmentOverlay), not recomputed at draw
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/// time, so a column narrower than an already-rendered image needs those
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/// blocks restyled to shrink it.
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public func updateContentInset() {
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let target = Self.horizontalInset(viewWidth: bounds.width,
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maxContentWidth: maxContentWidthPoints)
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guard abs(textContainerInset.width - target) > 0.5 else { return }
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textContainerInset = NSSize(width: target, height: textContainerInset.height)
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let imageBlocks = IndexSet(blocks.indices.filter { blocks[$0].content.contains("![") })
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guard !imageBlocks.isEmpty else { return }
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for idx in imageBlocks { blocks[idx].isStyled = false }
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recomposeDirty(imageBlocks, cursorInRaw: currentCursorInRaw(), settingSelection: true)
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}
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/// Recompute the centered inset as the view width changes (window resize).
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public override func setFrameSize(_ newSize: NSSize) {
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super.setFrameSize(newSize)
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updateContentInset()
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}
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}
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