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2.7 KiB
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46 lines
No EOL
2.7 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>@OnEnable — Ludic</title>
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<meta name="description" content="Run a handler when a paused property is re-enabled on an instance.">
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<link rel="stylesheet" href="base.css">
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<link rel="stylesheet" href="docs.css">
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</head>
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<body>
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<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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<main class="wrap item">
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#annotations">Annotations</a> <span>›</span> <span class="here">@OnEnable</span></div>
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<div class="item-head">
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<span class="kind-badge kind-annotation">annotation</span>
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<h1 id="top">@OnEnable</h1>
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</div>
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<code class="sig">@OnEnable(Property) handler Name { … }</code>
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<div class="desc"><p><code>@OnEnable(Property)</code> fires when a property that is present but disabled is turned back on with <code>enable P on e</code>. Unlike <code>@OnAttach</code>, the property's data was never destroyed — enable/disable only pause and resume a property that already exists, keeping its fields intact — so this hook is about a capability becoming active again rather than being created. The body runs in the instance's context and can read the retained field values. Use the enable/disable pair for a capability that toggles repeatedly (a power-up, a stun) where re-seeding on every toggle would be wrong. Add <code>@Public</code> to also emit a <code>prop_<Property>_enable</code> event.</p></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program EnableHook {
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property Tag { value: int = 0 }
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property Shield { amount: int = 0 }
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model Unit { Tag, Shield }
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@OnEnable(Shield) handler ShieldBackOnline { # fires when Shield is re-enabled
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print(Shield.amount) # 5 — the retained amount, not re-seeded
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}
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handler Seed phase Start {
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spawn Unit { Tag { value: 1 }, Shield { amount: 5 } }
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for (unit) in query [Unit] { disable Shield on self() }
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}
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handler Reactivate phase Render {
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for (unit) in query [Unit] { enable Shield on self() } # triggers @OnEnable
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quit()
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}
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}</pre></div>
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</main>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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