From b320d174be0b114b70cae64112f3e584033d9e93 Mon Sep 17 00:00:00 2001
From: "(quasar) nebula" <qznebula@protonmail.com>
Date: Thu, 30 Apr 2026 19:55:51 -0300
Subject: content, data: FlashSide.isolateActs, previous{Flash,Act}, etc

---
 src/data/things/flash/Flash.js | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'src/data/things/flash/Flash.js')

diff --git a/src/data/things/flash/Flash.js b/src/data/things/flash/Flash.js
index 1f290b3f..b06b0452 100644
--- a/src/data/things/flash/Flash.js
+++ b/src/data/things/flash/Flash.js
@@ -1,4 +1,5 @@
 import {input, V} from '#composite';
+import {atOffset} from '#sugar';
 import Thing from '#thing';
 import {anyOf, isColor, isDirectory, isNumber, isString}
   from '#validators';
@@ -138,6 +139,36 @@ export class Flash extends Thing {
       withPropertyFromObject('act', V('side')),
       exposeDependency('#act.side'),
     ],
+
+    previousFlash: {
+      flags: {expose: true},
+      expose: {
+        dependencies: ['this', 'act', 'side'],
+        compute: ({this: flash, act, side}) =>
+          (flash !== act.flashes.at(0)
+            ? atOffset(act.flashes, act.flashes.indexOf(flash), -1)
+         : side.isolateActs
+            ? null
+         : act.previousAct
+            ? act.previousAct.flashes.at(-1)
+            : null),
+      },
+    },
+
+    nextFlash: {
+      flags: {expose: true},
+      expose: {
+        dependencies: ['this', 'act', 'side'],
+        compute: ({this: flash, act, side}) =>
+          (flash !== act.flashes.at(-1)
+            ? atOffset(act.flashes, act.flashes.indexOf(flash), +1)
+         : side.isolateActs
+            ? null
+         : act.nextAct
+            ? act.nextAct.flashes.at(0)
+            : null),
+      },
+    },
   });
 
   static [Thing.getSerializeDescriptors] = ({
-- 
cgit 1.3.0-6-gf8a5