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

input/scrub_input.go

@@ -0,0 +1,76 @@
+package input
+
+import (
+	"log/slog"
+	"math"
+
+	"github.com/egoist/mygo/ui"
+
+	"github.com/ZacharyZhang-NY/MujicaUI/core"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
+)
+
+// ScrubInputOptions configure a ScrubInput; the range and step rules are NumberInput's.
+type ScrubInputOptions struct {
+	Min, Max  float64
+	Step      float64
+	Precision int
+	Disabled  bool
+}
+
+// scrubInputPixels is how far a drag moves for one step.
+const scrubInputPixels float32 = 4
+
+// ScrubInput edits *value by dragging its label sideways, one Step per 4 DIPs, or by typing in its field.
+func ScrubInput(c *ui.Context, label string, value *float64, opts ScrubInputOptions) InputResult {
+	if label == "" || value == nil {
+		panic("mujica: ScrubInput needs a label and a value")
+	}
+	nopts := NumberInputOptions{Min: opts.Min, Max: opts.Max, Step: opts.Step, Precision: opts.Precision, Label: label, Disabled: opts.Disabled}
+	s := NumberInputResolve(nopts)
+	k := core.Tokens(c)
+	var r InputResult
+	row := ui.Row(c).AlignItems(ui.Center).Gap(core.Density(c).Unit() * 2).Disabled(opts.Disabled)
+	row.Children(func() {
+		h := ui.Box(c).Shrink(0).MinHeight(theme.MinHitSize).MinWidth(theme.MinHitSize).Center().Cursor(ui.CursorResizeEW).Role(ui.RoleNone)
+		drag := ui.Local(h, "scrub_input.drag", func() float64 { return math.NaN() })
+		dx, _, held := h.Dragged()
+		scrubbed := false
+		switch {
+		case !held || h.IsDisabled():
+			*drag = math.NaN()
+		case math.IsNaN(*drag):
+			*drag = 0
+			fallthrough
+		default:
+			start := *value
+			*drag += float64(dx)
+			if n := int(*drag / float64(scrubInputPixels)); n != 0 {
+				*drag -= float64(n) * float64(scrubInputPixels)
+				// One grid step at a time, so a long drag stops at the bound.
+				v := start
+				for range max(n, -n) {
+					v = s.StepBy(v, max(-1, min(1, n)))
+				}
+				if v != *value {
+					*value, scrubbed = v, true
+				}
+			}
+		}
+		fg := k.TextMuted
+		if held || h.Hovered() {
+			fg = k.AccentText
+		}
+		h.Children(func() {
+			ui.Text(c, label).TextColor(fg).Underline().DecorationColor(k.Border).SingleLine()
+		})
+		r = NumberInput(c, value, nopts)
+		r.Element.Width(core.Density(c).Unit() * 36)
+		r.changed = r.changed || scrubbed
+		if scrubbed {
+			slog.Debug("mujica: scrub_input scrubbed", "label", label, "value", *value)
+		}
+	})
+	r.Element = row
+	return r
+}