124 lines
3.8 KiB
Go
124 lines
3.8 KiB
Go
package mujica
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import (
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"fmt"
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"log/slog"
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"time"
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"github.com/egoist/mygo/ui"
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"mujicaui/theme"
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)
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// L2Level is a level's price, size and order count.
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type L2Level struct {
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Price, Size float64
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Orders int
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}
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// Level2Data holds the bid and ask levels, best first.
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type Level2Data struct {
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Bids, Asks []L2Level
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}
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// Level2QuotesOptions configure a Level2Quotes.
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type Level2QuotesOptions struct {
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// Decimals of prices and sizes; zero means 2 and 0.
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Decimals, SizeDecimals int
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// Levels shown each side; zero means 5.
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Levels int
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}
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// level2Mark is a level's last values and size move.
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type level2Mark struct {
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price, size float64
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dir int
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at time.Time
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seen bool
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}
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// Level2Quotes lists bid and ask levels; changes flash and mark.
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func Level2Quotes(c *ui.Context, data Level2Data, opts Level2QuotesOptions) *ui.Element {
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dec := priceDecimals("Level2Quotes", opts.Decimals)
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if opts.SizeDecimals < 0 || opts.Levels < 0 {
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panic("mujica: Level2Quotes SizeDecimals and Levels cannot be negative")
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}
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n := opts.Levels
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if n == 0 {
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n = 5
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}
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u := Density(c).Unit()
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e := ui.Row(c).Gap(u * 3).AlignItems(ui.Start).Role(ui.RoleTable).Label(msg(c, "level2_quotes.label"))
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marks := ui.Local(e, "marks", func() map[string]*level2Mark { return map[string]*level2Mark{} })
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e.Children(func() {
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for _, side := range []OrderSide{SideBuy, SideSell} {
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levels := data.Bids
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if side == SideSell {
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levels = data.Asks
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}
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ui.Column(c).Grow(1).Basis(0).MinWidth(0).Children(func() {
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for i := range n {
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var l *L2Level
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if i < len(levels) {
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l = &levels[i]
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}
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level2Row(c, *marks, side, i, l, dec, opts.SizeDecimals)
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}
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})
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}
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})
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return e
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}
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// level2Row is one level with its move mark.
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func level2Row(c *ui.Context, marks map[string]*level2Mark, side OrderSide, i int, l *L2Level, dec, sizeDec int) {
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k := Tokens(c)
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d := Density(c)
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name := fmt.Sprintf(msg(c, fmt.Sprintf("level2_quotes.side%d", side)), i+1)
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key := fmt.Sprint(side, i)
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m := marks[key]
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if m == nil {
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m = &level2Mark{}
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marks[key] = m
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}
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row := ui.Row(c).Gap(d.Unit()*2).AlignItems(ui.Center).MinHeight(d.ControlHeight()).Padding(0, d.Unit()*2).
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Radius(theme.ControlRadius).BorderWidth(0, 0, theme.BorderWidth, 0).BorderColor(k.Border)
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if l == nil {
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row.Children(func() {
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ui.Text(c, name).TextColor(k.TextMuted).FontSize(FontSize(c, theme.CaptionSize)).Width(28)
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ui.Text(c, "—").TextColor(k.TextMuted)
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})
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return
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}
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if m.seen && (l.Price != m.price || l.Size != m.size) {
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// A new price is a new level, not a move.
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m.dir, m.at = 0, c.Now()
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if l.Price == m.price {
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m.dir = trendSign(l.Size - m.size)
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}
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slog.Debug("mujica: level2_quotes level changed", "level", name)
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}
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m.price, m.size, m.seen = l.Price, l.Size, true
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if dur := Motion(c, priceTextFlash); dur > 0 && !m.at.IsZero() {
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if t := c.Now().Sub(m.at); t < dur {
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row.Background(k.Selection.Alpha(1 - float32(float64(t)/float64(dur))))
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c.AnimationFrame()
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}
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}
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col := trendColor(c, side.sign())
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sizeText := statisticFormat(l.Size, sizeDec)
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orders := fmt.Sprintf(msg(c, "level2_quotes.orders"), l.Orders)
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row.Role(ui.RoleRow).Label(name + " " + statisticFormat(l.Price, dec) + " " + sizeText + " " + orders)
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row.Children(func() {
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ui.Text(c, name).TextColor(k.TextMuted).FontSize(FontSize(c, theme.CaptionSize)).Width(28)
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ui.Text(c, statisticFormat(l.Price, dec)).TextColor(col).FontFeatures("tnum").FontWeight(600).Grow(1).Basis(0).SingleLine()
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ui.Row(c).Gap(2).AlignItems(ui.Center).Justify(ui.End).Grow(1).Basis(0).Children(func() {
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if m.dir != 0 {
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ui.Icon(c, trendIcon(m.dir)).Size(12, 12).TextColor(trendColor(c, m.dir))
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}
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ui.Text(c, sizeText).FontFeatures("tnum").SingleLine()
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})
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ui.Text(c, fmt.Sprint(l.Orders)).TextColor(k.TextMuted).FontFeatures("tnum").TextAlign(ui.End).Width(36).SingleLine()
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})
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}
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