/
spinner.go
81 lines (64 loc) · 1.44 KB
/
spinner.go
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package tui
import (
"image/color"
"gioui.org/gesture"
"gioui.org/io/pointer"
"gioui.org/layout"
"gioui.org/op/clip"
"gioui.org/unit"
)
type Spin struct {
Axis layout.Axis
Delta float32
last float32
drag gesture.Drag
}
func (spin *Spin) Dragging() bool { return spin.drag.Dragging() }
func (spin *Spin) Layout(gtx layout.Context) layout.Dimensions {
size := gtx.Constraints.Max
var de *pointer.Event
for _, e := range spin.drag.Events(gtx.Metric, gtx, gesture.Axis(spin.Axis)) {
if e.Type == pointer.Press || e.Type == pointer.Drag {
de = &e
}
}
if de != nil {
if de.Type == pointer.Press {
spin.last = de.Position.X
}
spin.Delta = de.Position.X - spin.last
spin.last = de.Position.X
}
defer clip.Rect{Max: size}.Push(gtx.Ops).Pop()
pointer.CursorColResize.Add(gtx.Ops)
spin.drag.Add(gtx.Ops)
return layout.Dimensions{Size: size}
}
type SpinnerStyle struct {
Color color.NRGBA
Active color.NRGBA
Spin *Spin
}
func Spinner(col, active color.NRGBA, spin *Spin) SpinnerStyle {
return SpinnerStyle{
Color: col,
Active: active,
Spin: spin,
}
}
func (spin SpinnerStyle) Layout(gtx layout.Context) layout.Dimensions {
col := spin.Color
if spin.Spin.Dragging() {
col = spin.Active
}
dims := RoundBox(col).Layout(gtx,
layout.Spacer{
Height: unit.Dp(12),
Width: unit.Dp(4),
}.Layout,
)
gtx.Constraints.Min = dims.Size
gtx.Constraints.Max = dims.Size
spin.Spin.Layout(gtx)
return dims
}