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circular.go
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circular.go
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package progress
import (
"fmt"
"math"
"github.com/maxence-charriere/go-app/v9/pkg/app"
"github.com/mlctrez/goapp-mdc/pkg/base"
)
type Circular struct {
app.Compo
base.JsUtil
id string
size int
label string
progress float64
onmount func(ctx app.Context)
colors [4]string
target app.Value
}
func NewCircular(id string, size int) *Circular {
return &Circular{id: id, size: size, target: app.Undefined()}
}
func (c *Circular) Label(label string) *Circular {
c.label = label
return c
}
func (c *Circular) Colors(colors [4]string) *Circular {
c.colors = colors
return c
}
func (c *Circular) WithOnMount(cb func(ctx app.Context)) *Circular {
c.onmount = cb
return c
}
func (c *Circular) Render() app.UI {
root := app.Div().ID(c.id)
root.Class("mdc-circular-progress", "mdc-circular-progress--closed").Aria("hidden", "true")
sizePx := fmt.Sprintf("%dpx", c.size)
root.Style("width", sizePx).Style("height", sizePx)
root.Aria("valuemin", "0").Aria("valuemax", "1").Aria("valuenow", "0")
if c.label != "" {
root.Aria("label", c.label)
}
determinateContainer := app.Div().Class("mdc-circular-progress__determinate-container").Body(app.Raw(c.DeterminateSVG()))
indeterminateContainer := app.Div().Class("mdc-circular-progress__indeterminate-container")
if c.colors[0] == "" {
// single color spinner
indeterminateContainer.Body(
app.Div().Class("mdc-circular-progress__spinner-layer").Body(
app.Div().Class("mdc-circular-progress__circle-clipper", "mdc-circular-progress__circle-left").Body(app.Raw(c.IndeterminateCircleGraphicSVG(WidthRatio, ""))),
app.Div().Class("mdc-circular-progress__gap-patch").Body(app.Raw(c.IndeterminateCircleGraphicSVG(WidthRatioSmall, ""))),
app.Div().Class("mdc-circular-progress__circle-clipper", "mdc-circular-progress__circle-right").Body(app.Raw(c.IndeterminateCircleGraphicSVG(WidthRatio, ""))),
),
)
} else {
var fourColorsBody []app.UI
for i, color := range c.colors {
layer := app.Div().Class("mdc-circular-progress__spinner-layer", fmt.Sprintf("mdc-circular-progress__color-%d", i+1)).Body(
app.Div().Class("mdc-circular-progress__circle-clipper", "mdc-circular-progress__circle-left").Body(app.Raw(c.IndeterminateCircleGraphicSVG(WidthRatio, color))),
app.Div().Class("mdc-circular-progress__gap-patch").Body(app.Raw(c.IndeterminateCircleGraphicSVG(WidthRatioSmall, color))),
app.Div().Class("mdc-circular-progress__circle-clipper", "mdc-circular-progress__circle-right").Body(app.Raw(c.IndeterminateCircleGraphicSVG(WidthRatio, color))),
)
fourColorsBody = append(fourColorsBody, layer)
}
indeterminateContainer.Body(fourColorsBody...)
}
root.Body(determinateContainer, indeterminateContainer)
return root
}
const RadiusRatio = float64(18) / float64(48)
const WidthRatio = float64(4) / float64(48)
const WidthRatioSmall = float64(3.2) / float64(48)
func (c *Circular) DeterminateSVG() string {
size := float64(c.size)
center := c.size / 2
radius := size * RadiusRatio
//width := size * WidthRatio
// circumference is 2*PI*r
stroke := 2 * math.Pi * radius
strokeWidth := size * WidthRatio
result := fmt.Sprintf(`<svg class="mdc-circular-progress__determinate-circle-graphic" viewBox="0 0 %d %d" xmlns="http://www.w3.org/2000/svg">\n`, c.size, c.size)
result += fmt.Sprintf(`<circle class="mdc-circular-progress__determinate-track" cx="%d" cy="%d" r="%.1f" stroke-width="%.1f"/>\n`, center, center, radius, strokeWidth)
result += fmt.Sprintf(`<circle class="mdc-circular-progress__determinate-circle" cx="%d" cy="%d" r="%.1f" stroke-dasharray="%.1f" stroke-dashoffset="%.1f" stroke-width="%.1f"/>\n`,
center, center, radius, stroke, stroke, strokeWidth)
result += "</svg>"
return result
}
func (c *Circular) IndeterminateCircleGraphicSVG(ratio float64, color string) string {
size := float64(c.size)
center := c.size / 2
radius := size * RadiusRatio
// circumference is 2*PI*r
stroke := 2 * math.Pi * radius
strokeWidth := size * ratio
result := fmt.Sprintf(`<svg class="mdc-circular-progress__indeterminate-circle-graphic" viewBox="0 0 %d %d" xmlns="http://www.w3.org/2000/svg" style="stroke: %s;">`, c.size, c.size, color)
result += fmt.Sprintf(`<circle cx="%d" cy="%d" r="%.1f" stroke-dasharray="%.1f" stroke-dashoffset="%.1f" stroke-width="%.1f"/>`, center, center, radius, stroke, stroke/2, strokeWidth)
result += "</svg>"
return result
}
func (c *Circular) OnMount(ctx app.Context) {
rootElement := app.Window().GetElementByID(c.id)
c.target = c.JsNewAtPath("mdc.circularProgress.MDCCircularProgress", rootElement)
if c.onmount != nil {
c.onmount(ctx)
}
}
func (c *Circular) Open() {
if !c.target.IsUndefined() {
c.target.Call("open")
}
}
func (c *Circular) Determinate(d bool) {
if !c.target.IsUndefined() {
c.target.Set("determinate", d)
}
}
func (c *Circular) SetProgress(f float64) {
c.progress = f
if !c.target.IsUndefined() {
c.target.Set("progress", c.progress)
}
}
func (c *Circular) Close() {
if !c.target.IsUndefined() {
c.target.Call("close")
}
}