ZacharyZhang-NY
5605d785de
Fifteen shop components: PriceTag, Wallet, ShopItem, Cart, Receipt, Checkout, CurrencyConvert, SaleBadge, Quantity, PricingTiers, Coupon, DailyReward, BidTicker, TradeWindow and VendingMachine. Receipt prints dot by dot with feed holes and a torn edge; Coupon cuts real notches; SaleBadge is a sixteen-point starburst; VendingMachine sells A1 to D4 by code and drops the snack into its tray. Sums are checked against overflow, TradeWindow withdraws both confirms on any change to an offer, and a disabled Checkout veils its inert content. text.Odometer now counts digits as text, steps at 15 fps as S5 asks, draws exact digits at rest and lands rolls that floats would stall.
95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
package shop
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import (
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"fmt"
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"log/slog"
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"strconv"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/icon"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type QuantityOptions struct {
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// Min is the least; Max the most, zero meaning 99.
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Min, Max int
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Disabled bool
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}
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type QuantityResult struct {
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Element *ui.Element
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Changed bool
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}
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// Quantity steps − n + within its limits.
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func Quantity(c *ui.Context, text string, value *int, o QuantityOptions) QuantityResult {
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k := pixel.K(c)
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lo, hi := o.Min, pixel.Or("Quantity Max", o.Max, 99)
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if lo < 0 || hi < lo || *value < lo || *value > hi {
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panic(fmt.Sprintf("shop: Quantity %d outside %d to %d", *value, lo, hi))
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}
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shell, base, st := pixel.Shell(c, func() *ui.Element {
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return ui.Box(c).Focusable().Role(ui.RoleStepper).Label(text).Disabled(o.Disabled)
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})
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old, nw := *value, pixel.Measure(strconv.Itoa(hi))+6
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if !base.IsDisabled() {
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step := 0
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// Enter and Space are taken, so clicks come from pointers.
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base.Shortcut(0, ui.KeyEnter)
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base.Shortcut(0, ui.KeySpace)
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if base.Shortcut(0, ui.KeyLeft) || base.Shortcut(0, ui.KeyDown) {
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step--
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}
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if base.Shortcut(0, ui.KeyRight) || base.Shortcut(0, ui.KeyUp) {
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step++
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}
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if base.Clicked() {
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if x, _, _ := base.PointerPosition(); int(x/k.Dot()) < 14 {
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step--
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} else if int(x/k.Dot()) >= 14+nw {
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step++
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}
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}
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// One at a time toward the limit, so nothing overflows.
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for ; step > 0 && *value < hi; step-- {
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*value++
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}
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for ; step < 0 && *value > lo; step++ {
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*value--
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}
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if base.Shortcut(0, ui.KeyHome) {
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*value = lo
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}
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if base.Shortcut(0, ui.KeyEnd) {
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*value = hi
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}
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}
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n := *value
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base.Description(strconv.Itoa(n))
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shell.Size(k.D(28+nw), k.D(pixel.LineHeight)).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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// A side at its limit fades; it goes no further.
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for _, b := range []struct {
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x int
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sp *pixel.Sprite
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on bool
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}{{0, icon.Minus, n > lo}, {14 + nw, icon.Plus, n < hi}} {
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ink := pixel.Faint
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if b.on {
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ink = pixel.Ink
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}
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g.Frame(b.x, 1, 14, 14, pixel.Raised, pixel.Face)
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g.Sprite(b.x+1, 2, b.sp, 0, ink, 1)
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}
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s := strconv.Itoa(n)
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g.Text(14+(nw-pixel.Measure(s))/2, 0, s, pixel.Ink, 1)
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g.Finish(st)
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})
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res := QuantityResult{Element: shell, Changed: *value != old}
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if res.Changed {
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slog.Debug("8bit: quantity", "label", text, "value", *value)
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}
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return res
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}
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