ZacharyZhang-NYandClaude Opus 5.5
4efaf2680f
Stack through StickyHeader, with behavior tests and gallery demos. kit gains Arrive, Settle (paint-time layout check) and Shade. Several actions return named ui.Element results; mygo vet forbids elements in structs. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
26 lines
861 B
Go
26 lines
861 B
Go
package layout
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import (
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"git.zacharyzhang.com/ZacharyZhang-NY/CrychicUI/kit"
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"github.com/egoist/mygo/ui"
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)
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// StickyHeader tops a scroll; its shadow fades in once scrolled.
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func StickyHeader(c *ui.Context, header, content func()) ui.Element {
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t := c.Theme()
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root := ui.Column(c).Clip()
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st := ui.Local(root, "scroll", func() ui.ScrollState { return ui.ScrollState{} })
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kit.Settle(c, root, []float32{st.Y}, func() []float32 { return []float32{st.Y} })
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return root.Children(func() {
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head := ui.Row(c).FillWidth().Gap(t.Space(2)).Padding(t.Space(2), t.Space(3)).AlignItems(ui.Center).
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Background(t.Background)
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target := float32(0)
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if st.Y > 0 {
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target = 1
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}
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a := head.AnimateTo("shadow", target, ui.Snappy)
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head.Shadow(0, 1, 4, 0, kit.Shade(0.1*a)).Children(header)
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ui.Scroll(c).Grow(1).Basis(0).TrackScroll(st).Children(content)
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})
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}
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