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sample/src/main/java/com/google/accompanist/sample/pager/HorizontalPagerLoopingTabsSample.kt
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| /* | ||
| * Copyright 2021 The Android Open Source Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.google.accompanist.sample.pager | ||
|
|
||
| import android.os.Bundle | ||
| import androidx.activity.ComponentActivity | ||
| import androidx.activity.compose.setContent | ||
| import androidx.compose.foundation.layout.Box | ||
| import androidx.compose.foundation.layout.Column | ||
| import androidx.compose.foundation.layout.PaddingValues | ||
| import androidx.compose.foundation.layout.fillMaxSize | ||
| import androidx.compose.foundation.layout.fillMaxWidth | ||
| import androidx.compose.foundation.layout.padding | ||
| import androidx.compose.material.Card | ||
| import androidx.compose.material.MaterialTheme | ||
| import androidx.compose.material.Scaffold | ||
| import androidx.compose.material.ScrollableTabRow | ||
| import androidx.compose.material.Surface | ||
| import androidx.compose.material.Tab | ||
| import androidx.compose.material.TabRowDefaults | ||
| import androidx.compose.material.Text | ||
| import androidx.compose.material.TopAppBar | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.derivedStateOf | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.rememberCoroutineScope | ||
| import androidx.compose.ui.Alignment | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.res.stringResource | ||
| import androidx.compose.ui.unit.dp | ||
| import com.google.accompanist.pager.ExperimentalPagerApi | ||
| import com.google.accompanist.pager.HorizontalPager | ||
| import com.google.accompanist.pager.pagerTabIndicatorOffset | ||
| import com.google.accompanist.pager.rememberPagerState | ||
| import com.google.accompanist.sample.AccompanistSampleTheme | ||
| import com.google.accompanist.sample.R | ||
| import kotlinx.coroutines.launch | ||
|
|
||
| class HorizontalPagerLoopingTabsSample : ComponentActivity() { | ||
| override fun onCreate(savedInstanceState: Bundle?) { | ||
| super.onCreate(savedInstanceState) | ||
|
|
||
| setContent { | ||
| AccompanistSampleTheme { | ||
| Surface { | ||
| Sample() | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| @OptIn(ExperimentalPagerApi::class) | ||
| @Composable | ||
| private fun Sample() { | ||
| Scaffold( | ||
| topBar = { | ||
| TopAppBar( | ||
| title = { Text(stringResource(R.string.horiz_pager_title_looping_tabs)) }, | ||
| backgroundColor = MaterialTheme.colors.surface, | ||
| ) | ||
| }, | ||
| modifier = Modifier.fillMaxSize() | ||
| ) { padding -> | ||
| val pages = remember { | ||
| listOf("Home", "Shows", "Movies", "Books", "Really long movies", "Short audiobooks") | ||
| } | ||
|
|
||
| Column( | ||
| Modifier | ||
| .fillMaxSize() | ||
| .padding(padding) | ||
| ) { | ||
| val coroutineScope = rememberCoroutineScope() | ||
|
|
||
| // We start the pager in the middle of the raw number of pages | ||
| val loopingCount = Int.MAX_VALUE | ||
| val startIndex = loopingCount / 2 | ||
| val pagerState = rememberPagerState(initialPage = startIndex) | ||
|
|
||
| fun pageMapper(index: Int): Int { | ||
| return (index - startIndex).floorMod(pages.count()) | ||
| } | ||
|
|
||
| val currentIndex by remember { | ||
| derivedStateOf { pageMapper(pagerState.currentPage) } | ||
| } | ||
|
|
||
| ScrollableTabRow( | ||
| // Our selected tab is our current page | ||
| selectedTabIndex = currentIndex, | ||
| indicator = { tabPositions -> | ||
| TabRowDefaults.Indicator( | ||
| Modifier.pagerTabIndicatorOffset(pagerState, tabPositions, ::pageMapper) | ||
| ) | ||
| } | ||
| ) { | ||
| // Add tabs for all of our pages | ||
| pages.forEachIndexed { index, title -> | ||
| Tab( | ||
| text = { Text(title) }, | ||
| selected = currentIndex == index, | ||
| onClick = { | ||
| // Animate to the selected page when clicked | ||
| coroutineScope.launch { | ||
| when { | ||
| currentIndex > index -> { | ||
| pagerState.animateScrollToPage( | ||
| page = pagerState.currentPage - (currentIndex - index) | ||
| ) | ||
| } | ||
| currentIndex < index -> { | ||
| pagerState.animateScrollToPage( | ||
| page = pagerState.currentPage + (index - currentIndex) | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| HorizontalPager( | ||
| count = loopingCount, | ||
| state = pagerState, | ||
| // Add 16.dp padding to 'center' the pages | ||
| contentPadding = PaddingValues(16.dp), | ||
| modifier = Modifier | ||
| .weight(1f) | ||
| .fillMaxWidth() | ||
| ) { index -> | ||
| val page = pageMapper(index) | ||
| Card { | ||
| Box(Modifier.fillMaxSize()) { | ||
| Text( | ||
| text = "Page: ${pages[page]}", | ||
| style = MaterialTheme.typography.h4, | ||
| modifier = Modifier.align(Alignment.Center) | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private fun Int.floorMod(other: Int): Int = when (other) { | ||
| 0 -> this | ||
| else -> this - floorDiv(other) * other | ||
| } |
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