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56 lines
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2.6 KiB
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<title>exit — Ludic</title>
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<meta name="description" content="The scene-exit hook — runs once as a scene is left.">
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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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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#scenes">Scenes & layers</a> <span>›</span> <span class="here">exit</span></div>
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<div class="item-head">
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<span class="kind-badge kind-keyword">keyword</span>
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<h1 id="top">exit</h1>
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</div>
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<code class="sig">on exit { … }</code>
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<div class="desc"><p><code>exit</code> names the body of a scene's exit hook, written <code>on exit { … }</code>. It runs <b>once</b> when the scene is left — on a <code>become Other</code>, the leaving scene's <code>on exit</code> runs first, then the active scene switches and the new scene's <code>on enter</code> runs. Use it to tear down what the scene created so it does not leak into the next state: despawn the scene's models, hide a menu, save progress. Like <code>on enter</code>, it is a lifecycle hook rather than a phase and holds plain statements, not <code>phase</code> handlers.</p></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program ExitHookExample {
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property Position { column: int = 0, row: int = 0 }
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model Enemy { Position }
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scene Battle start {
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on enter { spawn Enemy { Position { column: 8, row: 4 } } }
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on exit {
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for (any_position) in query [Position, {Enemy}] { despawn self() }
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}
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layer Fight {
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handler LeaveBattle phase Update {
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if Input.key() == 'q' { become Overworld }
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}
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handler DrawBattle phase Render {
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Screen.clear(Color.Crimson)
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Screen.show()
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}
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}
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}
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scene Overworld {
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layer World {
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handler DrawWorld phase Render {
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Screen.clear(Color.MidnightBlue)
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Screen.show()
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}
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}
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}
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}</pre></div>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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