37 lines
1.3 KiB
Swift
37 lines
1.3 KiB
Swift
import SwiftUI
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struct FlowLayout: Layout {
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var spacing: CGFloat = 8
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func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
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let width = proposal.width ?? .infinity
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var x: CGFloat = 0, y: CGFloat = 0, rowHeight: CGFloat = 0
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for view in subviews {
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let size = view.sizeThatFits(.unspecified)
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if x + size.width > width, x > 0 {
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x = 0
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y += rowHeight + spacing
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rowHeight = 0
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}
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x += size.width + spacing
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rowHeight = max(rowHeight, size.height)
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}
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return CGSize(width: width.isFinite ? width : x, height: y + rowHeight)
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}
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func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
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var x = bounds.minX, y = bounds.minY, rowHeight: CGFloat = 0
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for view in subviews {
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let size = view.sizeThatFits(.unspecified)
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if x + size.width > bounds.maxX, x > bounds.minX {
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x = bounds.minX
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y += rowHeight + spacing
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rowHeight = 0
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}
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view.place(at: CGPoint(x: x, y: y), proposal: ProposedViewSize(size))
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x += size.width + spacing
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rowHeight = max(rowHeight, size.height)
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}
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}
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}
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