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35 lines
743 B
Go
35 lines
743 B
Go
package gioui
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import (
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"image/color"
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"gioui.org/layout"
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"gioui.org/op/clip"
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"gioui.org/op/paint"
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)
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type Surface struct {
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Height int
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Inset layout.Inset
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Focus bool
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}
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func (s Surface) Layout(gtx C, widget layout.Widget) D {
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t := TrackerFromContext(gtx)
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t.surfaceHeight += s.Height
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bg := func(gtx C) D {
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gray := s.Height * 8
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if s.Focus {
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gray += 8
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}
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gray8 := uint8(min(max(gray, 0), 255))
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color := color.NRGBA{R: gray8, G: gray8, B: gray8, A: 255}
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paint.FillShape(gtx.Ops, color, clip.Rect{Max: gtx.Constraints.Min}.Op())
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return D{Size: gtx.Constraints.Min}
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}
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fg := func(gtx C) D { return s.Inset.Layout(gtx, widget) }
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dims := layout.Background{}.Layout(gtx, bg, fg)
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t.surfaceHeight -= s.Height
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return dims
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}
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