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|
package mpb
import (
"io"
"strings"
"github.com/acarl005/stripansi"
"github.com/mattn/go-runewidth"
"github.com/vbauerster/mpb/v7/decor"
"github.com/vbauerster/mpb/v7/internal"
)
const (
positionLeft = 1 + iota
positionRight
)
// SpinnerStyleComposer interface.
type SpinnerStyleComposer interface {
BarFillerBuilder
PositionLeft() SpinnerStyleComposer
PositionRight() SpinnerStyleComposer
}
type sFiller struct {
count uint
position uint
frames []string
}
type spinnerStyle struct {
position uint
frames []string
}
// SpinnerStyle constructs default spinner style which can be altered via
// SpinnerStyleComposer interface.
func SpinnerStyle(frames ...string) SpinnerStyleComposer {
ss := new(spinnerStyle)
if len(frames) != 0 {
ss.frames = append(ss.frames, frames...)
} else {
ss.frames = []string{"⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"}
}
return ss
}
func (s *spinnerStyle) PositionLeft() SpinnerStyleComposer {
s.position = positionLeft
return s
}
func (s *spinnerStyle) PositionRight() SpinnerStyleComposer {
s.position = positionRight
return s
}
func (s *spinnerStyle) Build() BarFiller {
sf := &sFiller{
position: s.position,
frames: s.frames,
}
return sf
}
func (s *sFiller) Fill(w io.Writer, width int, stat decor.Statistics) {
width = internal.CheckRequestedWidth(width, stat.AvailableWidth)
frame := s.frames[s.count%uint(len(s.frames))]
frameWidth := runewidth.StringWidth(stripansi.Strip(frame))
if width < frameWidth {
return
}
rest := width - frameWidth
switch s.position {
case positionLeft:
io.WriteString(w, frame+strings.Repeat(" ", rest))
case positionRight:
io.WriteString(w, strings.Repeat(" ", rest)+frame)
default:
str := strings.Repeat(" ", rest/2) + frame + strings.Repeat(" ", rest/2+rest%2)
io.WriteString(w, str)
}
s.count++
}
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