99 lines
3.1 KiB
Go
99 lines
3.1 KiB
Go
package mujica
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import (
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"cmp"
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"log/slog"
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"math"
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"github.com/egoist/mygo/ui"
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"mujicaui/theme"
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)
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// VerticalSliderOptions configure a VerticalSlider. Min and Max both zero mean 0 to 100.
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type VerticalSliderOptions struct {
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Min, Max float64
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// Step snaps the value; zero is continuous.
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Step float64
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Marks []SliderMark
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// Height is the track length; zero is 160.
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Height float32
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// ShowValue shows the value beside the thumb while hovered, dragged or focused.
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ShowValue bool
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Format func(float64) string
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Disabled bool
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Label string
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}
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// VerticalSlider is a Slider standing up: max at the top, Up and Right raise it.
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func VerticalSlider(c *ui.Context, value *float64, opts VerticalSliderOptions) ChoiceResult {
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if value == nil {
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panic("mujica: VerticalSlider needs a value")
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}
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if !(opts.Height >= 0) || math.IsInf(float64(opts.Height), 1) {
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panic("mujica: VerticalSlider Height must be finite and >= 0")
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}
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g, _ := sliderSetup(opts.Min, opts.Max, opts.Step, opts.Marks, false, c)
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format := sliderFormat(opts.Format, g)
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k := Tokens(c)
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size := FontSize(c, theme.CaptionSize)
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h := cmp.Or(opts.Height, 160)
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old := g.snap(*value)
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*value = old
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var s *ui.Element
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var next float64
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var held bool
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wrap := ui.Column(c).Disabled(opts.Disabled)
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wrap.Children(func() { s, next, held = sliderControl(c, old, g, g.lo, g.hi) })
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// The base maps the pointer across; here the height decides.
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y := func(r ui.Rect, v float64) float32 {
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return r.Y + r.H - sliderThumb/2 - (r.H-sliderThumb)*float32((v-g.lo)/(g.hi-g.lo))
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}
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if held {
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if _, py, _ := s.PointerPosition(); s.Bounds().H > sliderThumb {
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f := 1 - float64((py-sliderThumb/2)/(s.Bounds().H-sliderThumb))
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next = g.snap(g.lo + max(0, min(1, f))*(g.hi-g.lo))
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}
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}
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w := Density(c).ControlHeight()
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for _, m := range opts.Marks {
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if m.Label != "" {
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w += 40
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break
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}
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}
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s.Size(w, h).PaddingY(sliderThumb / 2).FocusRing(false).Cursor(ui.CursorPointer)
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if opts.Label != "" {
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s.Label(opts.Label)
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}
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if !wrap.IsDisabled() {
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*value = next
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}
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changed := *value != old
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if changed {
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slog.Debug("mujica: vertical_slider changed", "label", opts.Label, "value", *value)
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}
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hot := s.Hovered() || held
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v := *value
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s.Draw(func(p *ui.Painter, r ui.Rect) {
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x := r.X + Density(c).ControlHeight()/2
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top, bot := y(r, g.hi), y(r, g.lo)
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p.Fill(ui.Rect{X: x - sliderTrack/2, Y: top, W: sliderTrack, H: bot - top}, k.Border, 0)
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p.Stroke(ui.Rect{X: x - sliderTrack/2, Y: top, W: sliderTrack, H: bot - top}, k.ControlBorder, 0, 1)
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p.Fill(ui.Rect{X: x - sliderTrack/2, Y: y(r, v), W: sliderTrack, H: bot - y(r, v)}, k.AccentText, 0)
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for _, m := range opts.Marks {
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my := y(r, m.Value)
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p.Fill(ui.Rect{X: x + sliderTrack/2 + 2, Y: my - 0.5, W: 5, H: 1}, k.TextMuted, 0)
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if m.Label != "" {
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_, th := p.MeasureText(1000, ui.Span{Text: m.Label, Size: size})
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p.Text(x+sliderTrack/2+10, my-th/2, m.Label, size, k.TextMuted)
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}
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}
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sliderThumbPaint(p, k, x, y(r, v), hot, s.FocusVisible())
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if opts.ShowValue && (hot || s.Focused()) {
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sliderBubblePaint(p, k, x, y(r, v), format(v), size)
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}
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})
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return ChoiceResult{wrap, changed}
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}
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