203 lines
8.3 KiB
Go
203 lines
8.3 KiB
Go
// Package app holds the go-wasm-web example's pages and components as
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// standalone, platform-neutral functions (SSR on the server, hydrate on the
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// client). UI is built from the kjol webui kit + Tailwind utility classes.
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//
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// Directives (processed by kjol/cmd/wasmgen at build time):
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//
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// //gowasm:page <path> [static] [layout=<name>] a route (static => SSR'd)
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// //gowasm:layout <name> a func(Deps, *VNode) *VNode wrapper
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// //gowasm:server (see server_counter.go) a server component
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package app
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//go:generate go run kjol/cmd/wasmgen .
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import (
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"strconv"
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. "kjol/vdom"
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ui "kjol/webui"
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)
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// Deps are the client-only capabilities, injected so pages stay neutral.
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type Deps struct {
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Path func() string
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Navigate func(string)
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}
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func itoa(n int) string { return strconv.Itoa(n) }
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// Layout wraps a page's content with shared chrome (declared with //gowasm:layout,
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// selected per route via `layout=`; the generated LayoutFor dispatches by name).
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type Layout func(d Deps, content *VNode) *VNode
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// Shell renders the current route's page inside its declared layout.
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func Shell(d Deps, routes map[string]func() *VNode) *VNode {
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path := d.Path()
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var content *VNode
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if page := routes[path]; page != nil {
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content = page()
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} else {
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content = notFound(path)
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}
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return LayoutFor(d, path, content)
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}
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func notFound(path string) *VNode {
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return Div(Attr("class", "py-10"),
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H2(Attr("class", "text-xl font-semibold text-neutral-800 mb-2"), Text("Page not found")),
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P(Attr("class", "text-neutral-500"), Text("No route matches "+path+".")),
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)
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}
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// --- layouts (Tailwind chrome) -------------------------------------------
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//gowasm:layout public
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func PublicLayout(d Deps, content *VNode) *VNode {
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return Div(
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Nav(Attr("class", "site-nav sticky top-0 z-10 border-b border-neutral-200 bg-white"),
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Div(Attr("class", "mx-auto flex max-w-5xl items-center gap-2 px-4 py-3"),
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A(Attr("class", "text-lg font-semibold tracking-tight text-text-heading no-underline"), Attr("href", "/"), navigate(d, "/"), Text("gowasm")),
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Ul(Attr("class", "ml-auto flex items-center gap-1"),
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navItem(d, "/", "Home", false),
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navItem(d, "/about", "About", false),
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Li(Attr("class", "ml-2"),
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A(Attr("class", "inline-flex items-center gap-1 rounded-default bg-primary px-3 py-1.5 text-sm font-medium text-white no-underline hover:bg-primary-hover"),
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Attr("href", "/chart"), navigate(d, "/chart"), Text("Open app →"))),
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))),
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Main(Attr("class", "mx-auto max-w-5xl px-4 py-8"),
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content,
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Footer(Attr("class", "mt-12 border-t border-neutral-200 pt-4 text-sm text-neutral-400"),
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Text("gowasm — pure-Go components compiled to WebAssembly.")),
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),
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)
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}
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//gowasm:layout app
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func AppLayout(d Deps, content *VNode) *VNode {
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return Div(Attr("class", "min-h-screen"),
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Nav(Attr("class", "app-nav border-b border-neutral-800 bg-neutral-900"),
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Div(Attr("class", "mx-auto flex max-w-5xl items-center gap-2 px-4 py-3"),
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A(Attr("class", "text-lg font-semibold tracking-tight text-text-on-dark no-underline"), Attr("href", "/chart"), navigate(d, "/chart"), Text("gowasm · app")),
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Ul(Attr("class", "ml-4 flex items-center gap-1"),
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navItem(d, "/chart", "Chart", true),
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navItem(d, "/server", "Server", true),
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navItem(d, "/kit", "UI Kit", true)),
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Ul(Attr("class", "ml-auto flex items-center"),
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navItem(d, "/", "Home", true)),
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)),
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Main(Attr("class", "mx-auto max-w-5xl px-4 py-8"), content),
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)
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}
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// navItem is a nav link with an active state; dark switches to on-dark colors.
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func navItem(d Deps, path, label string, dark bool) *VNode {
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active := d.Path() == path
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var cls string
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switch {
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case dark && active:
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cls = "active rounded-default px-3 py-1.5 text-sm font-medium bg-white/10 text-white"
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case dark:
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cls = "rounded-default px-3 py-1.5 text-sm font-medium text-neutral-300 hover:bg-white/5 hover:text-white"
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case active:
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cls = "active rounded-default px-3 py-1.5 text-sm font-medium bg-neutral-100 text-neutral-900"
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default:
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cls = "rounded-default px-3 py-1.5 text-sm font-medium text-neutral-600 hover:bg-neutral-100 hover:text-neutral-900"
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}
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return Li(A(Attr("class", cls+" no-underline"), Attr("href", path), navigate(d, path), Text(label)))
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}
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// navigate intercepts a link click for client-side SPA navigation (Navigate is
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// nil on the server, so the anchor falls back to a normal navigation).
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func navigate(d Deps, path string) Mod {
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return OnEvent(EVENT_CLICK, func(e Event) {
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if d.Navigate != nil {
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e.PreventDefault()
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d.Navigate(path)
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}
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})
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}
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// Counter is a presentational client component; state is owned by the caller.
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func Counter(label string, count *Signal[int]) *VNode {
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return Div(Attr("class", "counter flex items-center gap-3 rounded-default border border-neutral-200 bg-white px-4 py-3 shadow-xs"),
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Span(Attr("class", "font-medium text-neutral-700"), Text(label+": ")),
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Strong(Attr("class", "badge inline-flex min-w-8 items-center justify-center rounded-full bg-primary px-2.5 py-0.5 text-sm font-semibold text-white"), Text(itoa(count.Get()))),
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Div(Attr("class", "ml-auto flex gap-1"),
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ui.Button(ui.ButtonProps{Color: ui.ButtonSecondary, Small: true, Text: "−", OnClick: func() { count.Update(func(v int) int { return v - 1 }) }}),
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ui.Button(ui.ButtonProps{Color: ui.ButtonPrimary, Small: true, Text: "+", OnClick: func() { count.Update(func(v int) int { return v + 1 }) }}),
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),
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)
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}
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//gowasm:page / static layout=public
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func HomePage(d Deps) func() *VNode {
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a := NewSignal(0)
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b := NewSignal(0)
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dark := NewSignal(false)
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return func() *VNode {
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return Div(Attr("class", "space-y-8"),
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Div(
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H2(Attr("class", "text-2xl font-semibold tracking-tight text-text-heading"), Text("Home — component composition")),
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P(Attr("class", "mt-1 text-neutral-500"), Text("Two counters; the total is derived across them. Server-rendered, then hydrated.")),
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),
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Div(Attr("class", "grid gap-3 sm:grid-cols-2"),
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Counter("Apples", a),
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Counter("Bananas", b),
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),
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ui.Alert(ui.AlertBlue, "",
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Span(Text("Combined total: ")),
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Strong(Attr("class", "font-semibold"), Text(itoa(a.Get()+b.Get()))),
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),
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ui.Card("",
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ui.CardHeader("", Text("webui kit")),
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Div(Attr("class", "flex flex-wrap items-center gap-2"),
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ui.Button(ui.ButtonProps{Color: ui.ButtonPrimary, Text: "Primary"}),
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ui.Button(ui.ButtonProps{Color: ui.ButtonGreen, Text: "Green"}),
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ui.Button(ui.ButtonProps{Color: ui.ButtonRed, Outline: true, Text: "Danger"}),
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ui.Button(ui.ButtonProps{Color: ui.ButtonNeutral, Small: true, Icon: "check", Text: "Small"}),
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ui.Badge(ui.BadgeProps{Color: ui.BadgeGreen}, Text("active")),
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ui.Badge(ui.BadgeProps{Color: ui.BadgeAmber, Pill: true}, Text("pending")),
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),
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Div(Attr("class", "mt-4"),
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ui.ToggleSwitch(dark.Get(), func(v bool) { dark.Set(v) }, "Dark mode", "Just a demo toggle", false, "")),
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),
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)
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}
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}
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//gowasm:page /about static layout=public
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func AboutPage(d Deps) func() *VNode {
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return func() *VNode {
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return Div(Attr("class", "space-y-6"),
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H2(Attr("class", "text-2xl font-semibold tracking-tight text-text-heading"), Text("About")),
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ui.Card("",
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P(Attr("class", "text-neutral-600 leading-relaxed"),
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Text("Components are standalone Go functions; calling a server component looks "+
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"identical to calling a client one — the //gowasm:server directive and the "+
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"build-time codegen wire up the round-trip. Static routes are SSR'd; the rest "+
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"render on the client. The UI kit (kjol/webui) is a Go port of the Solid.js "+
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"component kit, styled with Tailwind.")),
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),
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ui.Alert(ui.AlertGreen, "Neutral + isomorphic",
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Text("This page's markup runs on the server (SSR) and hydrates on the client from the same Go code.")),
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)
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}
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}
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//gowasm:page /server layout=app
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func ServerPage(d Deps) func() *VNode {
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// ServerCounter is a server component — calling it is just like calling any
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// component. On the client this resolves to a generated stub that mounts it
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// over /rsc; on the server it's the real function.
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counter := ServerCounter()
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return func() *VNode {
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return Div(Attr("class", "space-y-6"),
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H2(Attr("class", "text-2xl font-semibold tracking-tight text-text-heading"), Text("Server component")),
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P(Attr("class", "text-neutral-500"),
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Text("This counter runs on the server. Its state lives there; clicks round-trip "+
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"and the returned render merges into the DOM.")),
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counter(),
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)
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}
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}
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