/
progressbar.go
66 lines (56 loc) · 1.49 KB
/
progressbar.go
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package splash
import (
"image"
"image/color"
"gioui.org/layout"
"gioui.org/op/clip"
"gioui.org/op/paint"
"gioui.org/unit"
"gioui.org/widget/material"
)
type ProgressBarStyle struct {
Color color.NRGBA
TrackColor color.NRGBA
Progress float32
}
func ProgressBar(th *material.Theme, progress float32) ProgressBarStyle {
return ProgressBarStyle{
Progress: progress,
Color: th.Palette.ContrastBg,
TrackColor: mulAlpha(th.Palette.Fg, 0x05),
}
}
func (p ProgressBarStyle) Layout(gtx layout.Context) layout.Dimensions {
shader := func(width int, color color.NRGBA) layout.Dimensions {
d := image.Point{X: width, Y: gtx.Dp(unit.Dp(6))}
rr := gtx.Dp(4)
defer clip.UniformRRect(image.Rectangle{Max: image.Pt(width, d.Y)}, rr).Push(gtx.Ops).Pop()
paint.ColorOp{Color: color}.Add(gtx.Ops)
paint.PaintOp{}.Add(gtx.Ops)
return layout.Dimensions{Size: d}
}
progressBarWidth := gtx.Constraints.Max.X
return layout.Stack{Alignment: layout.W}.Layout(gtx,
layout.Stacked(func(gtx layout.Context) layout.Dimensions {
return shader(progressBarWidth, p.TrackColor)
}),
layout.Stacked(func(gtx layout.Context) layout.Dimensions {
if p.Progress == 0.0 {
return layout.Dimensions{}
}
fillWidth := int(float32(progressBarWidth) * clamp1(p.Progress))
fillColor := p.Color
return shader(fillWidth, fillColor)
}),
)
}
// clamp1 limits v to range [0..1].
func clamp1(v float32) float32 {
if v >= 1 {
return 1
} else if v <= 0 {
return 0
} else {
return v
}
}