Pagination#reverse

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## 0.2.1
 
+* `Pagination`
+    * `Common`:
+        * Extension `Pagination#reverse` has been added
+
 ## 0.2.0
 
 * `Repos`

pagination/common/src/commonMain/kotlin/dev/inmo/micro_utils/pagination/utils/PaginationReversing.kt

@@ -0,0 +1,22 @@
+package dev.inmo.micro_utils.pagination.utils
+
+import dev.inmo.micro_utils.pagination.*
+
+/**
+ * Example:
+ *
+ * * `|__f__l_______________________|` will be transformed to `|_______________________f__l__|`
+ * * `|__f__l_|` will be transformed to `|__f__l_|`
+ *
+ * @return Reversed version of this [Pagination]
+ */
+fun Pagination.reverse(objectsCount: Long): SimplePagination {
+    if (firstIndex > objectsCount) {
+        return Pagination(objectsCount.toInt(), size)
+    }
+    val firstIndex = (objectsCount - firstIndex - size).toInt()
+    return Pagination(
+        firstIndex,
+        size
+    )
+}