49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
package display
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import (
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type RibbonOptions struct {
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// Slot is the band; zero means Accent.
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Slot pixel.Slot
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}
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const tail = 12
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// Ribbon is a title banner with notched, folded tails.
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func Ribbon(c *ui.Context, title string, o RibbonOptions) *ui.Element {
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k := pixel.K(c)
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band := slotOr(o.Slot, pixel.Accent)
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tw := pixel.Measure(title)
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w, h := tw+2*tail+8, pixel.LineHeight+4
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return ui.Box(c).Size(k.D(w), k.D(h+4)).Role(ui.RoleText).Label(title).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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for j := range h {
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cut := h/2 - abs(j-h/2)
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for _, x0 := range []int{cut, w - tail} {
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n := tail - cut
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g.HLine(x0, 4+j, n, band)
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g.Veil(x0, 4+j, n, 1, pixel.Shade, 8)
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if j == 0 || j == h-1 {
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g.HLine(x0, 4+j, n, pixel.Edge)
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}
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}
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}
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g.Rect(tail-3, h+1, 3, 3, pixel.Edge)
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g.Rect(w-tail, h+1, 3, 3, pixel.Edge)
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g.Frame(tail-3, 0, w-2*tail+6, h, pixel.Flat, band)
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g.HLine(tail-2, 1, w-2*tail+4, pixel.AccentLit)
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g.Text((w-tw)/2, 2, title, pixel.AccentInk, 1)
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})
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}
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func abs(n int) int {
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if n < 0 {
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return -n
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}
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return n
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}
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