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Feature: pagination

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This commit is contained in:
ArtemEmelyanov 2023-11-10 22:19:18 +04:00
parent a78c75ef07
commit 14dabf5f60
9 changed files with 84 additions and 34 deletions
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4
.idea/deploymentTargetDropDown.xml
View File

@ -7,11 +7,11 @@
<deviceKey>
<Key>
<type value="VIRTUAL_DEVICE_PATH" />
<value value="C:\Users\Admin\.android\avd\Pixel_2_API_30.avd" />
<value value="C:\Users\Admin\.android\avd\Pixel_7_Pro_API_30.avd" />
</Key>
</deviceKey>
</Target>
</targetSelectedWithDropDown>
<timeTargetWasSelectedWithDropDown value="2023-10-29T18:24:53.426357Z" />
<timeTargetWasSelectedWithDropDown value="2023-11-10T15:46:58.753378100Z" />
</component>
</project>

4
app/build.gradle.kts
View File

@ -83,4 +83,8 @@ dependencies {
kapt("androidx.room:room-compiler:$room_version")
implementation("androidx.room:room-ktx:$room_version")
implementation("androidx.room:room-paging:$room_version")
//Paging
implementation ("androidx.paging:paging-compose:3.2.1")
implementation ("androidx.paging:paging-runtime:3.2.1")
}

33
app/src/main/java/com/example/android_programming/composeui/Screens/AdminPanel/ChangePanel.kt
View File

@ -1,41 +1,62 @@
package com.example.android_programming.composeui.Screens.AdminPanel
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.layout.wrapContentHeight
import androidx.compose.foundation.layout.wrapContentSize
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.itemsIndexed
import androidx.compose.material.CircularProgressIndicator
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.lifecycle.viewmodel.compose.viewModel
import androidx.navigation.NavHostController
import androidx.paging.LoadState
import androidx.paging.compose.collectAsLazyPagingItems
import androidx.paging.compose.itemKey
import com.example.android_programming.model.Sneaker
import com.example.android_programming.vmodel.AppViewModelProvider
import com.example.android_programming.vmodel.SneakerViewModel
import kotlinx.coroutines.delay
@Composable
fun ChangePanel(navHostController: NavHostController, sneakerViewModel: SneakerViewModel = viewModel(factory = AppViewModelProvider.Factory)) {
val list = sneakerViewModel.SneakerList.collectAsState(initial = emptyList()).value
val list = sneakerViewModel.sneakerList.collectAsLazyPagingItems()
Column(
modifier = Modifier
.fillMaxSize()
.background(Color.White)
.padding(16.dp)
.padding(16.dp, 80.dp)
) {
Row {
LazyColumn(
modifier = Modifier
.fillMaxSize()
) {
itemsIndexed(list
){_, item->
CardSneakerForChange(item = item, navHostController)
items(list.itemCount) { index ->
list[index]?.let { sneaker ->
CardSneakerForChange(item = sneaker, navController = navHostController)
}
}
}
}
}
}

4
app/src/main/java/com/example/android_programming/composeui/Screens/HomeScreen/HomeScreen.kt
View File

@ -28,13 +28,11 @@ import com.example.android_programming.vmodel.OrderViewModel
@Composable
fun HomeScreen(navHostController: NavHostController, orderViewModel: OrderViewModel) {
val context = LocalContext.current
val sneakers = remember { mutableStateListOf<Sneaker>() }
Column(
modifier = Modifier
.fillMaxSize()
.background(Color.White)
.verticalScroll(rememberScrollState())
/*.verticalScroll(rememberScrollState())*/
) {
Row {
// Поле для поиска

30
app/src/main/java/com/example/android_programming/composeui/Screens/HomeScreen/SneakerRecyclerView/RecyclerView.kt
View File

@ -1,17 +1,18 @@
package com.example.android_programming.composeui.Screens.HomeScreen.SneakerRecyclerView
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.grid.GridCells
import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import androidx.lifecycle.viewmodel.compose.viewModel
import androidx.navigation.NavHostController
import androidx.paging.compose.collectAsLazyPagingItems
import androidx.paging.compose.itemKey
import com.example.android_programming.model.Sneaker
import com.example.android_programming.vmodel.AppViewModelProvider
import com.example.android_programming.vmodel.OrderViewModel
import com.example.android_programming.vmodel.SneakerViewModel
@ -23,17 +24,18 @@ fun RecyclerView(navHostController : NavHostController, orderViewModel: OrderVie
.fillMaxSize()
.padding(bottom = 60.dp)
) {
val list = sneakerViewModel.SneakerList.collectAsState(initial = emptyList()).value
val numColumns = 2
val chunkedList = list.chunked(numColumns)
val sneakerLazyPagingItems = sneakerViewModel.sneakerList.collectAsLazyPagingItems()
for (chunkedListItem in chunkedList) {
Row(
horizontalArrangement = Arrangement.Center,
modifier = Modifier.fillMaxWidth()
LazyVerticalGrid(
columns = GridCells.Fixed(2)
) {
for (item in chunkedListItem) {
CardSneaker(item, navHostController, orderViewModel.selectedItems) { selectedItem ->
items(
count = sneakerLazyPagingItems.itemCount,
key = sneakerLazyPagingItems.itemKey { sneaker -> sneaker.sneakerId!! }
) { index: Int ->
val sneaker: Sneaker? = sneakerLazyPagingItems[index]
if (sneaker != null) {
CardSneaker(sneaker, navHostController, orderViewModel.selectedItems) { selectedItem ->
orderViewModel.addSelectedItem(selectedItem)
}
}
@ -42,3 +44,5 @@ fun RecyclerView(navHostController : NavHostController, orderViewModel: OrderVie
}
}

3
app/src/main/java/com/example/android_programming/dao/SneakerDao.kt
View File

@ -1,5 +1,6 @@
package com.example.android_programming.dao
import androidx.paging.PagingSource
import androidx.room.Dao
import androidx.room.Delete
import androidx.room.Insert
@ -20,7 +21,7 @@ interface SneakerDao {
suspend fun delete(sneaker: Sneaker)
@Query("SELECT*FROM Sneaker")
fun getAllSneakers(): Flow<List<Sneaker>>
fun getAllSneakersPaged(): PagingSource<Int, Sneaker>
@Query("SELECT * FROM Sneaker WHERE sneakerId = :id")
suspend fun getSneakerById(id: Int): Sneaker

15
app/src/main/java/com/example/android_programming/repository/SneakerRepoImpl.kt
View File

@ -1,5 +1,10 @@
package com.example.android_programming.repository
import androidx.paging.Pager
import androidx.paging.PagingConfig
import androidx.paging.PagingData
import androidx.paging.PagingSource
import androidx.paging.cachedIn
import com.example.android_programming.dao.SneakerDao
import com.example.android_programming.model.Sneaker
import kotlinx.coroutines.flow.Flow
@ -13,6 +18,12 @@ class SneakerRepoImpl(private val sneakerDao: SneakerDao) : SneakerRepository {
override suspend fun deleteSneaker(sneaker: Sneaker) = sneakerDao.delete(sneaker)
override suspend fun getSneakerById(id: Int): Sneaker = sneakerDao.getSneakerById(id)
override fun getAllSneakers(): Flow<List<Sneaker>> = sneakerDao.getAllSneakers()
override fun getAllSneakersPaged(): PagingSource<Int, Sneaker> = sneakerDao.getAllSneakersPaged()
override fun call(): Flow<PagingData<Sneaker>> {
return Pager(
PagingConfig(pageSize = 5)
) {
sneakerDao.getAllSneakersPaged()
}.flow
}
}

5
app/src/main/java/com/example/android_programming/repository/SneakerRepository.kt
View File

@ -1,5 +1,7 @@
package com.example.android_programming.repository
import androidx.paging.PagingData
import androidx.paging.PagingSource
import com.example.android_programming.model.Sneaker
import kotlinx.coroutines.flow.Flow
@ -8,5 +10,6 @@ interface SneakerRepository {
suspend fun updateSneaker(sneaker: Sneaker)
suspend fun deleteSneaker(sneaker: Sneaker)
suspend fun getSneakerById(id: Int): Sneaker
fun getAllSneakers(): Flow<List<Sneaker>>
fun getAllSneakersPaged(): PagingSource<Int, Sneaker>
fun call(): Flow<PagingData<Sneaker>>
}

12
app/src/main/java/com/example/android_programming/vmodel/SneakerViewModel.kt
View File

@ -1,16 +1,24 @@
package com.example.android_programming.vmodel
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.lifecycle.ViewModel
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.ViewModelProvider.AndroidViewModelFactory.Companion.APPLICATION_KEY
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.CreationExtras
import androidx.paging.Pager
import androidx.paging.PagingConfig
import androidx.paging.PagingData
import androidx.paging.cachedIn
import androidx.paging.map
import com.example.android_programming.App
import com.example.android_programming.R
import com.example.android_programming.database.AppDatabase
import com.example.android_programming.model.Sneaker
import com.example.android_programming.repository.SneakerRepository
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.map
import kotlinx.coroutines.launch
class SneakerViewModel(private val sneakerRepository: SneakerRepository): ViewModel() {
@ -18,8 +26,8 @@ class SneakerViewModel(private val sneakerRepository: SneakerRepository): ViewMo
val model = mutableStateOf("")
val description = mutableStateOf("")
val price = mutableStateOf("")
val photo = mutableStateOf(R.drawable.img)
val SneakerList = sneakerRepository.getAllSneakers()
val photo = mutableIntStateOf(R.drawable.img)
val sneakerList = sneakerRepository.call().cachedIn(viewModelScope)
var sneaker: Sneaker? = null
fun insertSneaker() = viewModelScope.launch {