From ec56e74c980b7785989d41d904e4350c30fdf865 Mon Sep 17 00:00:00 2001
From: Adam Brown <adampsbrown@gmail.com>
Date: Wed, 2 Nov 2022 16:08:29 +0000
Subject: [PATCH] cancelling previous page jobs when switch gallery pages

---
 .../kotlin/app/dapk/st/messenger/gallery/PageReducer.kt     | 5 +++++
 .../dapk/st/messenger/gallery/state/ImageGalleryReducer.kt  | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/PageReducer.kt b/features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/PageReducer.kt
index d2e9dd0..b2b6c3d 100644
--- a/features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/PageReducer.kt
+++ b/features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/PageReducer.kt
@@ -38,3 +38,8 @@ sealed interface PageAction : Action {
 data class PageContainer<P>(
     val page: SpiderPage<out P>
 )
+
+fun PageContainer<*>.isDifferentPage(page: SpiderPage<*>): Boolean {
+    return page::class != this.page::class
+}
+
diff --git a/features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/state/ImageGalleryReducer.kt b/features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/state/ImageGalleryReducer.kt
index f66b2e9..5820b06 100644
--- a/features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/state/ImageGalleryReducer.kt
+++ b/features/messenger/src/main/kotlin/app/dapk/st/messenger/gallery/state/ImageGalleryReducer.kt
@@ -56,4 +56,10 @@ private fun SharedStateScope<Combined2<PageContainer<ImageGalleryPage>, Unit>>.c
             dispatch(PageAction.UpdatePage(page.state.copy(content = Lce.Content(media))))
         })
     },
+
+    sideEffect(PageAction.GoTo::class) { action, _ ->
+        if (getSharedState().state1.isDifferentPage(action.page)) {
+            jobBag.cancel("page")
+        }
+    }
 )