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widget/material: add focus and hover indicators to Clickable

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
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Elias Naur
2022-02-28 16:49:43 +01:00
parent f711e7eaa8
commit 50e35c9c3f
2 changed files with 7 additions and 0 deletions
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internal/f32color/rgba.go
+4
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@@ -154,6 +154,10 @@ func Disabled(c color.NRGBA) (d color.NRGBA) {
// Hovered blends dark colors towards white, and light colors towards
// black. It is approximate because it operates in non-linear sRGB space.
func Hovered(c color.NRGBA) (h color.NRGBA) {
if c.A == 0 {
// Provide a reasonable default for transparent widgets.
return color.NRGBA{A: 0x44, R: 0x88, G: 0x88, B: 0x88}
}
const ratio = 0x20
m := color.NRGBA{R: 0xff, G: 0xff, B: 0xff, A: c.A}
if approxLuminance(c) > 128 {