Split into category packages; module github.com/ZacharyZhang-NY/MujicaUI

chart/trend_indicator.go

@@ -0,0 +1,72 @@
+package chart
+
+import (
+	"math"
+
+	"github.com/egoist/mygo/ui"
+
+	"github.com/ZacharyZhang-NY/MujicaUI/core"
+	"github.com/ZacharyZhang-NY/MujicaUI/data"
+	"github.com/ZacharyZhang-NY/MujicaUI/icons"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
+)
+
+// TrendIndicatorOptions configure a TrendIndicator.
+type TrendIndicatorOptions struct {
+	// Precision is the decimals shown, 0 or more.
+	Precision int
+	// Unit follows the number, as "%".
+	Unit string
+	// Note explains the change, as "vs last week".
+	Note string
+	// Invert marks falls as good, as for costs or errors.
+	Invert bool
+	// Format replaces the built-in signed number.
+	Format func(v float64) string
+}
+
+// TrendIndicator shows signed change, direction, and semantic color.
+func TrendIndicator(c *ui.Context, change float64, opts TrendIndicatorOptions) *ui.Element {
+	if opts.Precision < 0 || math.IsNaN(change) || math.IsInf(change, 0) {
+		panic("mujica: TrendIndicator needs a number and Precision ≥ 0")
+	}
+	k := core.Tokens(c)
+	u := core.Density(c).Unit()
+	word, text := trendWords(c, change, opts)
+	col, icon := k.TextMuted, "minus"
+	switch {
+	case change > 0:
+		col, icon = k.Success, "arrow-up"
+	case change < 0:
+		col, icon = k.Danger, "arrow-down"
+	}
+	if opts.Invert && change != 0 {
+		col = map[bool]ui.Color{true: k.Danger, false: k.Success}[change > 0]
+	}
+	e := ui.Row(c).Gap(u).AlignItems(ui.Center).Wrap().Role(ui.RoleText).Label(word + " " + text)
+	e.Children(func() {
+		ui.Row(c).Gap(u / 2).AlignItems(ui.Center).TextColor(col).Children(func() {
+			ui.Icon(c, icons.Must(icon)).Size(14, 14)
+			ui.Text(c, text).FontWeight(600).SingleLine()
+		})
+		if opts.Note != "" {
+			ui.Text(c, opts.Note).FontSize(core.FontSize(c, theme.CaptionSize)).TextColor(k.TextMuted)
+		}
+	})
+	return e
+}
+
+// trendWords formats direction and signed change.
+func trendWords(c *ui.Context, change float64, opts TrendIndicatorOptions) (word, text string) {
+	word = core.Msg(c, "trend_indicator.flat")
+	switch {
+	case change > 0:
+		word = core.Msg(c, "trend_indicator.up")
+	case change < 0:
+		word = core.Msg(c, "trend_indicator.down")
+	}
+	if opts.Format != nil {
+		return word, opts.Format(change)
+	}
+	return word, data.StatisticSigned(change, opts.Precision) + opts.Unit
+}