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144 lines
5.2 KiB
Kotlin
144 lines
5.2 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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@file:OptIn(ExperimentalFoundationApi::class)
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package org.mozilla.fenix.compose
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import androidx.compose.foundation.ExperimentalFoundationApi
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import androidx.compose.foundation.background
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import androidx.compose.foundation.layout.Arrangement
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import androidx.compose.foundation.layout.Box
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import androidx.compose.foundation.layout.Column
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import androidx.compose.foundation.layout.Row
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import androidx.compose.foundation.layout.Spacer
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import androidx.compose.foundation.layout.height
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.layout.size
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import androidx.compose.foundation.pager.HorizontalPager
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import androidx.compose.foundation.pager.PagerState
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import androidx.compose.foundation.pager.rememberPagerState
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import androidx.compose.foundation.shape.CircleShape
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import androidx.compose.material.Text
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import androidx.compose.runtime.Composable
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import androidx.compose.ui.Alignment
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.unit.Dp
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import androidx.compose.ui.unit.dp
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import org.mozilla.fenix.compose.annotation.LightDarkPreview
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import org.mozilla.fenix.theme.FirefoxTheme
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/**
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* An horizontally laid out indicator for a [HorizontalPager] with the ability to leave the trail of
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* indicators to show progress, instead of just showing the current one as active.
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*
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* @param pagerState The state object of your [HorizontalPager] to be used to observe the list's state.
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* @param modifier The modifier to apply to this layout.
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* @param activeColor The color of the active page indicator, and the color of previous page
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* indicators in case [leaveTrail] is set to true.
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* @param inactiveColor The color of page indicators that are inactive.
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* @param leaveTrail Whether to leave the trail of indicators to show progress.
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* This defaults to false and just shows the current one as active.
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* @param spacing The spacing between each pager indicator in [Dp].
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*/
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@Composable
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fun PagerIndicator(
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pagerState: PagerState,
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modifier: Modifier = Modifier,
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activeColor: Color = FirefoxTheme.colors.indicatorActive,
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inactiveColor: Color = FirefoxTheme.colors.indicatorInactive,
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leaveTrail: Boolean = false,
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spacing: Dp = 8.dp,
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) {
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Row(
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modifier = modifier,
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horizontalArrangement = Arrangement.spacedBy(spacing),
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verticalAlignment = Alignment.CenterVertically,
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) {
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val showActiveModifier: (pageIndex: Int) -> Boolean =
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if (leaveTrail) {
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{ it <= pagerState.currentPage }
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} else {
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{ it == pagerState.currentPage }
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}
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repeat(pagerState.pageCount) {
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Box(
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modifier = Modifier
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.size(6.dp)
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.background(
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shape = CircleShape,
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color = if (showActiveModifier(it)) {
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activeColor
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} else {
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inactiveColor
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},
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),
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)
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}
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}
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}
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@LightDarkPreview
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@Composable
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private fun PagerIndicatorPreview() {
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FirefoxTheme {
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Column(
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modifier = Modifier
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.background(FirefoxTheme.colors.layer1)
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.padding(32.dp),
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horizontalAlignment = Alignment.CenterHorizontally,
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) {
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Text(
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text = "Without trail",
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style = FirefoxTheme.typography.caption,
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color = FirefoxTheme.colors.textPrimary,
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)
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Spacer(modifier = Modifier.height(8.dp))
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PagerIndicator(
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pagerState = rememberPagerState(1, pageCount = { 3 }),
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activeColor = FirefoxTheme.colors.actionPrimary,
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inactiveColor = FirefoxTheme.colors.actionSecondary,
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modifier = Modifier.align(Alignment.CenterHorizontally),
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)
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Spacer(modifier = Modifier.height(16.dp))
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Text(
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text = "With trail",
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style = FirefoxTheme.typography.caption,
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color = FirefoxTheme.colors.textPrimary,
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)
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Spacer(modifier = Modifier.height(8.dp))
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PagerIndicator(
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pagerState = rememberPagerState(1, pageCount = { 3 }),
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activeColor = FirefoxTheme.colors.actionPrimary,
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inactiveColor = FirefoxTheme.colors.actionSecondary,
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leaveTrail = true,
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modifier = Modifier.align(Alignment.CenterHorizontally),
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)
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Spacer(modifier = Modifier.height(8.dp))
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Text(
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text = "Default colors",
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style = FirefoxTheme.typography.caption,
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color = FirefoxTheme.colors.textPrimary,
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)
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Spacer(modifier = Modifier.height(8.dp))
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PagerIndicator(
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pagerState = rememberPagerState(1, pageCount = { 3 }),
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modifier = Modifier.align(Alignment.CenterHorizontally),
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)
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}
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}
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}
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