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PlaceholderShimmerSample.kt
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/
PlaceholderShimmerSample.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.placeholder
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material.ExperimentalMaterialApi
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Scaffold
import androidx.compose.material.Text
import androidx.compose.material.TopAppBar
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ArrowDownward
import androidx.compose.material.pullrefresh.PullRefreshIndicator
import androidx.compose.material.pullrefresh.pullRefresh
import androidx.compose.material.pullrefresh.rememberPullRefreshState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
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.graphics.vector.rememberVectorPainter
import androidx.compose.ui.res.stringResource
import coil.annotation.ExperimentalCoilApi
import coil.compose.rememberImagePainter
import com.google.accompanist.placeholder.PlaceholderHighlight
import com.google.accompanist.placeholder.material.placeholder
import com.google.accompanist.placeholder.material.shimmer
import com.google.accompanist.sample.AccompanistSampleTheme
import com.google.accompanist.sample.R
import com.google.accompanist.sample.randomSampleImageUrl
import kotlinx.coroutines.delay
class PlaceholderShimmerSample : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
AccompanistSampleTheme {
Sample()
}
}
}
}
@OptIn(ExperimentalCoilApi::class, ExperimentalMaterialApi::class)
@Composable
private fun Sample() {
Scaffold(
topBar = {
TopAppBar(
title = { Text(stringResource(R.string.placeholder_title_shimmer)) },
backgroundColor = MaterialTheme.colors.surface,
)
},
modifier = Modifier.fillMaxSize()
) { padding ->
// Simulate a fake 2-second 'load'. Ideally this 'refreshing' value would
// come from a ViewModel or similar
var refreshing by remember { mutableStateOf(false) }
LaunchedEffect(refreshing) {
if (refreshing) {
delay(4000)
refreshing = false
}
}
val state = rememberPullRefreshState(
refreshing = refreshing,
onRefresh = { refreshing = true }
)
Box(Modifier.pullRefresh(state)) {
LazyColumn(contentPadding = padding) {
if (refreshing.not()) {
item {
ListItem(
painter = rememberVectorPainter(Icons.Default.ArrowDownward),
text = "Pull down"
)
}
}
items(30) { index ->
ListItem(
painter = rememberImagePainter(randomSampleImageUrl(index)),
text = "Text",
// We're using the modifier provided by placeholder-material which
// uses good default values for the color
childModifier = Modifier.placeholder(
visible = refreshing,
highlight = PlaceholderHighlight.shimmer(),
)
)
}
}
PullRefreshIndicator(
refreshing = refreshing,
state = state,
modifier = Modifier.align(Alignment.TopCenter)
)
}
}
}