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Merge pull request #1158 from xiaozhikang0916/xzk/indicator-loop
[pager-indicator] Support indicator of looping page with infinite page size
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...rc/main/java/com/google/accompanist/sample/pager/HorizontalPagerLoopingIndicatorSample.kt
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,200 @@ | ||
| /* | ||
| * 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 | ||
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| import android.os.Bundle | ||
| import android.util.Log | ||
| import androidx.activity.ComponentActivity | ||
| import androidx.activity.compose.setContent | ||
| import androidx.compose.foundation.interaction.DragInteraction | ||
| import androidx.compose.foundation.interaction.PressInteraction | ||
| import androidx.compose.foundation.layout.Column | ||
| import androidx.compose.foundation.layout.PaddingValues | ||
| import androidx.compose.foundation.layout.aspectRatio | ||
| import androidx.compose.foundation.layout.fillMaxSize | ||
| import androidx.compose.foundation.layout.fillMaxWidth | ||
| import androidx.compose.foundation.layout.padding | ||
| import androidx.compose.material.Icon | ||
| import androidx.compose.material.IconButton | ||
| import androidx.compose.material.Scaffold | ||
| import androidx.compose.material.Surface | ||
| import androidx.compose.material.icons.Icons | ||
| import androidx.compose.material.icons.filled.PauseCircle | ||
| import androidx.compose.material.icons.filled.PlayCircle | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.LaunchedEffect | ||
| import androidx.compose.runtime.MutableState | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.mutableStateOf | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.setValue | ||
| import androidx.compose.ui.Alignment | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.unit.dp | ||
| import com.google.accompanist.pager.ExperimentalPagerApi | ||
| import com.google.accompanist.pager.HorizontalPager | ||
| import com.google.accompanist.pager.HorizontalPagerIndicator | ||
| import com.google.accompanist.pager.rememberPagerState | ||
| import com.google.accompanist.sample.AccompanistSampleTheme | ||
| import kotlinx.coroutines.CancellationException | ||
| import kotlinx.coroutines.delay | ||
|
|
||
| class HorizontalPagerLoopingIndicatorSample : ComponentActivity() { | ||
| override fun onCreate(savedInstanceState: Bundle?) { | ||
| super.onCreate(savedInstanceState) | ||
|
|
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| setContent { | ||
| AccompanistSampleTheme { | ||
| Surface { | ||
| Sample() | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| @OptIn(ExperimentalPagerApi::class) | ||
| @Composable | ||
| private fun Sample() { | ||
| Scaffold( | ||
| modifier = Modifier.fillMaxSize() | ||
| ) { padding -> | ||
| Column( | ||
| Modifier | ||
| .fillMaxSize() | ||
| .padding(padding) | ||
| ) { | ||
| // Display 10 items | ||
| val pageCount = 10 | ||
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| // 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) | ||
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| fun pageMapper(index: Int): Int { | ||
| return (index - startIndex).floorMod(pageCount) | ||
| } | ||
|
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| HorizontalPager( | ||
| // Set the raw page count to a really large number | ||
| count = loopingCount, | ||
| state = pagerState, | ||
| // Add 32.dp horizontal padding to 'center' the pages | ||
| contentPadding = PaddingValues(horizontal = 32.dp), | ||
| // Add some horizontal spacing between items | ||
| itemSpacing = 4.dp, | ||
| modifier = Modifier | ||
| .weight(1f) | ||
| .fillMaxWidth() | ||
| ) { index -> | ||
| // We calculate the page from the given index | ||
| val page = pageMapper(index) | ||
| PagerSampleItem( | ||
| page = page, | ||
| modifier = Modifier | ||
| .fillMaxWidth() | ||
| .aspectRatio(1f) | ||
| ) | ||
| } | ||
| HorizontalPagerIndicator( | ||
| pagerState = pagerState, | ||
| modifier = Modifier | ||
| .align(Alignment.CenterHorizontally) | ||
| .padding(16.dp), | ||
| pageCount = pageCount, | ||
| pageIndexMapping = ::pageMapper | ||
| ) | ||
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| val loopState = remember { | ||
| mutableStateOf(true) | ||
| } | ||
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| LoopControl(loopState, Modifier.align(Alignment.CenterHorizontally)) | ||
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| ActionsRow( | ||
| pagerState = pagerState, | ||
| modifier = Modifier.align(Alignment.CenterHorizontally), | ||
| infiniteLoop = true | ||
| ) | ||
|
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| var underDragging by remember { | ||
| mutableStateOf(false) | ||
| } | ||
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| LaunchedEffect(key1 = Unit) { | ||
| pagerState.interactionSource.interactions.collect { interaction -> | ||
| when (interaction) { | ||
| is PressInteraction.Press -> underDragging = true | ||
| is PressInteraction.Release -> underDragging = false | ||
| is PressInteraction.Cancel -> underDragging = false | ||
| is DragInteraction.Start -> underDragging = true | ||
| is DragInteraction.Stop -> underDragging = false | ||
| is DragInteraction.Cancel -> underDragging = false | ||
| } | ||
| } | ||
| } | ||
|
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| val looping = loopState.value | ||
| if (underDragging.not() && looping) { | ||
| LaunchedEffect(key1 = underDragging) { | ||
| try { | ||
| while (true) { | ||
| delay(1000L) | ||
| val current = pagerState.currentPage | ||
| val currentPos = pageMapper(current) | ||
| val nextPage = current + 1 | ||
| if (underDragging.not()) { | ||
| val toPage = nextPage.takeIf { nextPage < pagerState.pageCount } ?: (currentPos + startIndex + 1) | ||
| if (toPage > current) { | ||
| pagerState.animateScrollToPage(toPage) | ||
| } else { | ||
| pagerState.scrollToPage(toPage) | ||
| } | ||
| } | ||
| } | ||
| } catch (e: CancellationException) { | ||
| Log.i("page", "Launched paging cancelled") | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @Composable | ||
| fun LoopControl( | ||
| loopState: MutableState<Boolean>, | ||
| modifier: Modifier = Modifier, | ||
| ) { | ||
| IconButton( | ||
| onClick = { loopState.value = loopState.value.not() }, | ||
| modifier = modifier | ||
| ) { | ||
| val icon = if (loopState.value) { | ||
| Icons.Default.PauseCircle | ||
| } else { | ||
| Icons.Default.PlayCircle | ||
| } | ||
| Icon(imageVector = icon, contentDescription = null) | ||
| } | ||
| } | ||
|
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||
| private fun Int.floorMod(other: Int): Int = when (other) { | ||
| 0 -> this | ||
| else -> this - floorDiv(other) * other | ||
| } |
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