54 lines
1.7 KiB
Go
54 lines
1.7 KiB
Go
package mujica
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import (
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"fmt"
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"github.com/egoist/mygo/ui"
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"mujicaui/icons"
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"mujicaui/theme"
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)
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// SpreadIndicatorOptions configure a SpreadIndicator.
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type SpreadIndicatorOptions struct {
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// Decimals of the spread; zero means 2.
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Decimals int
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// WarnPercent flags spreads this wide, in percent; zero never.
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WarnPercent float64
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}
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// SpreadIndicator shows ask minus bid and its percent.
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func SpreadIndicator(c *ui.Context, bid, ask float64, opts SpreadIndicatorOptions) *ui.Element {
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if opts.WarnPercent < 0 {
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panic("mujica: SpreadIndicator with negative WarnPercent")
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}
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dec := priceDecimals("SpreadIndicator", opts.Decimals)
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k := Tokens(c)
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u := Density(c).Unit()
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spread := ask - bid
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pct := 0.0
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if mid := (ask + bid) / 2; mid > 0 {
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pct = spread / mid * 100
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}
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text := fmt.Sprintf(msg(c, "spread_indicator.value"), statisticFormat(spread, dec), statisticFormat(pct, 3))
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note, col, icon := "", k.TextMuted, ""
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switch {
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case spread < 0:
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note, col, icon = msg(c, "spread_indicator.crossed"), k.Danger, "circle-alert"
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case opts.WarnPercent > 0 && pct >= opts.WarnPercent:
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note, col, icon = msg(c, "spread_indicator.wide"), k.Warning, "triangle-alert"
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}
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e := ui.Row(c).Gap(u * 1.5).AlignItems(ui.Center).Shrink(0).Role(ui.RoleStatus).Label(text + " " + note)
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e.Children(func() {
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ui.Text(c, msg(c, "spread_indicator.title")).TextColor(k.TextMuted).FontSize(FontSize(c, theme.CaptionSize))
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ui.Text(c, text).FontFeatures("tnum").FontWeight(500).SingleLine()
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if note != "" {
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ui.Row(c).Gap(u / 2).AlignItems(ui.Center).TextColor(col).Children(func() {
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ui.Icon(c, icons.Must(icon)).Size(14, 14)
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ui.Text(c, note).FontSize(FontSize(c, theme.CaptionSize)).FontWeight(600).SingleLine()
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})
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}
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})
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return e
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}
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