72 lines
2.3 KiB
Go
72 lines
2.3 KiB
Go
package input
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import (
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"fmt"
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"log/slog"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type RangeSliderOptions struct {
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Min, Max float64
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Width int
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Disabled bool
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}
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type RangeSliderResult = SliderResult
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// RangeSlider sets *low and *high with two uncrossing knobs.
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func RangeSlider(c *ui.Context, text string, low, high *float64, o RangeSliderOptions) RangeSliderResult {
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k := pixel.K(c)
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lo, hi := bounds(o.Min, o.Max)
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w := pixel.Or("RangeSlider Width", o.Width, 96)
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was := [2]float64{*low, *high}
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e := ui.Box(c).Size(k.D(w), k.D(12)).Role(ui.RoleGroup).Label(text)
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e.Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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a, b := knobAt(*low, lo, hi, g.W-6), knobAt(*high, lo, hi, g.W-6)
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g.Frame(0, 4, g.W, 4, pixel.Sunken, pixel.Well)
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g.Rect(a+3, 5, b-a, 2, pixel.Accent)
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}).Children(func() {
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knob(c, k, e, low, rail{lo: lo, hi: *high, label: text + " low", disabled: o.Disabled}, lo, hi, w)
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knob(c, k, e, high, rail{lo: *low, hi: hi, label: text + " high", disabled: o.Disabled}, lo, hi, w)
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})
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if *low > *high {
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panic(fmt.Sprintf("input: RangeSlider low %v above high %v", *low, *high))
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}
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changed := was != [2]float64{*low, *high}
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if changed {
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slog.Debug("8bit: range slider", "label", text, "low", *low, "high", *high)
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}
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return SliderResult{Element: e, Changed: changed}
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}
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// knob is one draggable end, fenced by r.lo and r.hi.
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func knob(c *ui.Context, k pixel.Kit, track *ui.Element, v *float64, r rail, lo, hi float64, w int) {
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shell, base, st := pixel.Shell(c, func() *ui.Element {
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return ui.Box(c).Focusable().Role(ui.RoleSlider).Label(r.label).Description(fmtValue(*v)).Disabled(r.disabled)
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})
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set := func(x float64) { *v = max(r.lo, min(r.hi, x)) }
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if !r.disabled {
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if _, _, held := base.Dragged(); held {
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px, _, _ := base.PointerPosition()
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t := track.Bounds()
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set(lo + float64((base.Bounds().X+px-t.X)/max(1, t.W))*(hi-lo))
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}
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step := (hi - lo) / 20
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if base.Shortcut(0, ui.KeyLeft) || base.Shortcut(0, ui.KeyDown) {
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set(*v - step)
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}
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if base.Shortcut(0, ui.KeyRight) || base.Shortcut(0, ui.KeyUp) {
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set(*v + step)
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}
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}
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shell.Absolute().Left(k.D(knobAt(*v, lo, hi, w-6))).Top(k.D(1)).Size(k.D(6), k.D(10)).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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g.Frame(0, 0, 6, 10, pixel.Raised, pixel.Face)
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g.Finish(st)
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})
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}
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