Added pagerTabIndicatorOffset argument

google · Jun 16, 2022 · 5ec6a6b · 5ec6a6b
1 parent 60b1b16
commit 5ec6a6b
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diff --git a/pager-indicators/api/current.api b/pager-indicators/api/current.api
@@ -7,7 +7,7 @@ package com.google.accompanist.pager {
   }
 
   public final class PagerTabKt {
-    method @com.google.accompanist.pager.ExperimentalPagerApi public static androidx.compose.ui.Modifier pagerTabIndicatorOffset(androidx.compose.ui.Modifier, com.google.accompanist.pager.PagerState pagerState, java.util.List<androidx.compose.material.TabPosition> tabPositions);
+    method @com.google.accompanist.pager.ExperimentalPagerApi public static androidx.compose.ui.Modifier pagerTabIndicatorOffset(androidx.compose.ui.Modifier, com.google.accompanist.pager.PagerState pagerState, java.util.List<androidx.compose.material.TabPosition> tabPositions, optional kotlin.jvm.functions.Function1<? super java.lang.Integer,java.lang.Integer> pageIndexMapping);
   }
 
 }

diff --git a/pager-indicators/src/main/java/com/google/accompanist/pager/PagerTab.kt b/pager-indicators/src/main/java/com/google/accompanist/pager/PagerTab.kt
@@ -34,12 +34,13 @@ import androidx.compose.ui.unit.lerp
 fun Modifier.pagerTabIndicatorOffset(
     pagerState: PagerState,
     tabPositions: List<TabPosition>,
+    pageIndexMapping: (Int) -> Int = { it },
 ): Modifier = layout { measurable, constraints ->
     if (tabPositions.isEmpty()) {
         // If there are no pages, nothing to show
         layout(constraints.maxWidth, 0) {}
     } else {
-        val currentPage = minOf(tabPositions.lastIndex, pagerState.currentPage)
+        val currentPage = minOf(tabPositions.lastIndex, pageIndexMapping(pagerState.currentPage))
         val currentTab = tabPositions[currentPage]
         val previousTab = tabPositions.getOrNull(currentPage - 1)
         val nextTab = tabPositions.getOrNull(currentPage + 1)