From 8b21721f485d33c8e1be4fcf4f82d404515992b6 Mon Sep 17 00:00:00 2001
From: Sad Ellie <sadellie.dev@gmail.com>
Date: Wed, 14 Feb 2024 23:31:33 +0300
Subject: [PATCH] Endless PagedIsland

---
 .../unitto/core/ui/common/PagedIsland.kt      | 19 ++++++++++---------
 .../components/DateTimeResultBlock.kt         |  3 +--
 .../settings/formatting/FormattingScreen.kt   |  3 +--
 3 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/PagedIsland.kt b/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/PagedIsland.kt
index 9b076f68..84944998 100644
--- a/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/PagedIsland.kt
+++ b/core/ui/src/main/java/com/sadellie/unitto/core/ui/common/PagedIsland.kt
@@ -49,7 +49,7 @@ import kotlinx.coroutines.launch
  * [HorizontalPager] with a background and a page indicator.
  *
  * @param modifier [Modifier] that will be applied to the surround [Column].
- * @param pagerState [PagerState] that will passed [HorizontalPager].
+ * @param pageCount Page count for [PagerState] that will passed [HorizontalPager].
  * @param backgroundColor [Color] for background.
  * @param pageIndicatorAlignment [Alignment.Horizontal] for page indicator.
  * @param onClick Called on all clicks, even if the page didn't change.
@@ -58,7 +58,7 @@ import kotlinx.coroutines.launch
 @Composable
 fun PagedIsland(
     modifier: Modifier = Modifier,
-    pagerState: PagerState,
+    pageCount: Int,
     backgroundColor: Color = MaterialTheme.colorScheme.secondaryContainer,
     pageIndicatorAlignment: Alignment.Horizontal = Alignment.End,
     onClick: () -> Unit = {},
@@ -67,6 +67,8 @@ fun PagedIsland(
     val contentColor = MaterialTheme.colorScheme.contentColorFor(backgroundColor)
     val disabledContentColor = contentColor.copy(alpha = 0.5f)
     val corScope = rememberCoroutineScope()
+    // https://stackoverflow.com/a/75469260
+    val pagerState = rememberPagerState { pageCount * 1_000 }
 
     ProvideColor(color = contentColor) {
         Column(
@@ -92,8 +94,8 @@ fun PagedIsland(
                     .padding(vertical = 8.dp),
                 horizontalArrangement = Arrangement.spacedBy(8.dp, pageIndicatorAlignment),
             ) {
-                repeat(pagerState.pageCount) {
-                    PageDot(if (it == pagerState.currentPage) contentColor else disabledContentColor)
+                repeat(pageCount) {
+                    PageDot(if (it == pagerState.currentPage % pageCount) contentColor else disabledContentColor)
                 }
             }
 
@@ -102,10 +104,9 @@ fun PagedIsland(
                     .animateContentSize()
                     .fillMaxWidth(),
                 verticalAlignment = Alignment.Top,
-                state = pagerState
-            ) { page ->
-                pageContent(page)
-            }
+                state = pagerState,
+                pageContent = { page -> pageContent(page % pageCount) }
+            )
         }
     }
 }
@@ -124,7 +125,7 @@ private fun PageDot(
 private fun PreviewPagedIsland() {
     PagedIsland(
         modifier = Modifier.size(400.dp, 250.dp),
-        pagerState = rememberPagerState { 5 }
+        pageCount = 5,
     ) { currentPage ->
         Column {
             Text("Current page: $currentPage")
diff --git a/feature/datecalculator/src/main/java/com/sadellie/unitto/feature/datecalculator/components/DateTimeResultBlock.kt b/feature/datecalculator/src/main/java/com/sadellie/unitto/feature/datecalculator/components/DateTimeResultBlock.kt
index 5513126f..113c003a 100644
--- a/feature/datecalculator/src/main/java/com/sadellie/unitto/feature/datecalculator/components/DateTimeResultBlock.kt
+++ b/feature/datecalculator/src/main/java/com/sadellie/unitto/feature/datecalculator/components/DateTimeResultBlock.kt
@@ -21,7 +21,6 @@ package com.sadellie.unitto.feature.datecalculator.components
 import androidx.annotation.StringRes
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxWidth
-import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.foundation.text.selection.SelectionContainer
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
@@ -45,7 +44,7 @@ internal fun DateTimeResultBlock(
 
     PagedIsland(
         modifier = modifier,
-        pagerState = rememberPagerState { 6 },
+        pageCount = 6,
         onClick = { focusManager.clearFocus() },
         backgroundColor = MaterialTheme.colorScheme.tertiaryContainer
     ) { currentPage ->
diff --git a/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/formatting/FormattingScreen.kt b/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/formatting/FormattingScreen.kt
index c84e6912..82e3fc51 100644
--- a/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/formatting/FormattingScreen.kt
+++ b/feature/settings/src/main/java/com/sadellie/unitto/feature/settings/formatting/FormattingScreen.kt
@@ -30,7 +30,6 @@ import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.wrapContentWidth
-import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Architecture
@@ -128,7 +127,7 @@ fun FormattingScreen(
                 modifier = Modifier
                     .fillMaxWidth()
                     .padding(16.dp),
-                pagerState = rememberPagerState { 2 },
+                pageCount = 2,
             ) { currentPage ->
                 val preview = when (currentPage) {
                     0 -> "123456.${"789123456".repeat(ceil(uiState.precision.toDouble() / 9.0).toInt())}"