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widget/material: add hover to Button

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Signed-off-by: Egon Elbre <egonelbre@gmail.com>
This commit is contained in:
Egon Elbre
2021-01-17 17:51:57 +02:00
committed by Elias Naur
parent 93ebd51531
commit 468bd6f53a
2 changed files with 19 additions and 2 deletions
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internal/f32color/rgba.go
+11
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@@ -172,6 +172,17 @@ func Disabled(c color.NRGBA) (d color.NRGBA) {
}
}
// Hovered blends color towards a brighter color.
func Hovered(c color.NRGBA) (d color.NRGBA) {
const r = 0x20 // lighten ratio
return color.NRGBA{
R: byte(255 - int(255-c.R)*(255-r)/256),
G: byte(255 - int(255-c.G)*(255-r)/256),
B: byte(255 - int(255-c.B)*(255-r)/256),
A: c.A,
}
}
// approxLuminance is a fast approximate version of RGBA.Luminance.
func approxLuminance(c color.NRGBA) byte {
const (