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