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.
80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
package shop
|
|
|
|
import (
|
|
"fmt"
|
|
"log/slog"
|
|
"math"
|
|
|
|
"github.com/egoist/mygo/ui"
|
|
|
|
"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/icon"
|
|
"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/input"
|
|
"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
|
|
)
|
|
|
|
// CartLine is a ware in the cart and how many.
|
|
type CartLine struct {
|
|
// Name is unique in the cart; it keys the row.
|
|
Name string
|
|
Price int
|
|
Qty int
|
|
}
|
|
|
|
type CartOptions struct {
|
|
Currency Currency
|
|
// Width is in dots; zero means 260.
|
|
Width int
|
|
Disabled bool
|
|
}
|
|
|
|
type CartResult struct {
|
|
Element *ui.Element
|
|
Changed bool
|
|
// Removed is the line whose ✕ was pressed, else -1.
|
|
Removed int
|
|
}
|
|
|
|
// Cart lists lines with quantities and their total.
|
|
func Cart(c *ui.Context, text string, lines []CartLine, o CartOptions) CartResult {
|
|
k := pixel.K(c)
|
|
names, total := map[string]bool{}, 0
|
|
for _, l := range lines {
|
|
amount("Cart price", l.Price)
|
|
// Checked against what is left, so totals cannot overflow.
|
|
if l.Name == "" || names[l.Name] || l.Qty < 1 || l.Qty > 99 || l.Qty > 0 && l.Price > (math.MaxInt-total)/l.Qty {
|
|
panic(fmt.Sprintf("shop: Cart line %q, twice %v, %d at %d", l.Name, names[l.Name], l.Qty, l.Price))
|
|
}
|
|
names[l.Name], total = true, total+l.Price*l.Qty
|
|
}
|
|
res := CartResult{Removed: -1}
|
|
res.Element = ui.Column(c).Width(k.D(pixel.Or("Cart Width", o.Width, 260))).Gap(k.D(3)).Role(ui.RoleList).Label(text).Children(func() {
|
|
for i := range lines {
|
|
l := &lines[i]
|
|
ui.Row(c).Key(l.Name).FillWidth().Gap(k.D(4)).AlignItems(ui.Center).Role(ui.RoleListItem).Children(func() {
|
|
pixel.Text(c, l.Name, pixel.TextOptions{Wrap: true, MaxLines: 1}).Grow(1)
|
|
// A raise may not carry the total past an int.
|
|
most := 99
|
|
if l.Price > 0 {
|
|
most = min(99, (math.MaxInt-(total-l.Price*l.Qty))/l.Price)
|
|
}
|
|
res.Changed = Quantity(c, l.Name, &l.Qty, QuantityOptions{Min: 1, Max: most, Disabled: o.Disabled}).Changed || res.Changed
|
|
money(c, k, o.Currency, l.Price*l.Qty, pixel.Ink)
|
|
if input.IconButton(c, icon.Close, k.Msg("remove")+" "+l.Name, input.IconButtonOptions{Size: input.Small, Disabled: o.Disabled}).Clicked {
|
|
res.Removed = i
|
|
}
|
|
})
|
|
}
|
|
if len(lines) == 0 {
|
|
pixel.Text(c, k.Msg("empty"), pixel.TextOptions{Slot: pixel.Faint})
|
|
}
|
|
ui.Row(c).FillWidth().Gap(k.D(4)).Children(func() {
|
|
pixel.Text(c, k.Msg("total"), pixel.TextOptions{}).Grow(1)
|
|
money(c, k, o.Currency, total, pixel.Accent)
|
|
})
|
|
})
|
|
if res.Removed >= 0 {
|
|
slog.Debug("8bit: cart remove", "label", text, "line", res.Removed)
|
|
}
|
|
return res
|
|
}
|