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Request a new layout if previous smooth scroller was active during la…
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153 changes: 153 additions & 0 deletions
153
...com/rubensousa/dpadrecyclerview/sample/ui/screen/animation/PredictiveAnimationFragment.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| package com.rubensousa.dpadrecyclerview.sample.ui.screen.animation | ||
|
|
||
| import android.os.Bundle | ||
| import android.view.View | ||
| import android.view.ViewGroup | ||
| import androidx.compose.foundation.layout.fillMaxWidth | ||
| import androidx.compose.foundation.layout.height | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.unit.dp | ||
| import androidx.fragment.app.Fragment | ||
| import androidx.fragment.app.viewModels | ||
| import androidx.lifecycle.LiveData | ||
| import androidx.lifecycle.MutableLiveData | ||
| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.viewModelScope | ||
| import androidx.recyclerview.widget.RecyclerView | ||
| import com.rubensousa.dpadrecyclerview.OnViewHolderSelectedListener | ||
| import com.rubensousa.dpadrecyclerview.compose.DpadComposeFocusViewHolder | ||
| import com.rubensousa.dpadrecyclerview.sample.R | ||
| import com.rubensousa.dpadrecyclerview.sample.databinding.ScreenRecyclerviewBinding | ||
| import com.rubensousa.dpadrecyclerview.sample.ui.model.ListTypes | ||
| import com.rubensousa.dpadrecyclerview.sample.ui.viewBinding | ||
| import com.rubensousa.dpadrecyclerview.sample.ui.widgets.common.MutableListAdapter | ||
| import com.rubensousa.dpadrecyclerview.sample.ui.widgets.common.PlaceholderComposable | ||
| import com.rubensousa.dpadrecyclerview.sample.ui.widgets.item.ItemComposable | ||
| import com.rubensousa.dpadrecyclerview.sample.ui.widgets.item.MutableGridAdapter | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.delay | ||
| import kotlinx.coroutines.launch | ||
|
|
||
| class PredictiveAnimationFragment : Fragment(R.layout.screen_recyclerview) { | ||
|
|
||
| private val binding by viewBinding(ScreenRecyclerviewBinding::bind) | ||
| private val viewModel by viewModels<PredictiveAnimationViewModel>() | ||
|
|
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| override fun onViewCreated(view: View, savedInstanceState: Bundle?) { | ||
| super.onViewCreated(view, savedInstanceState) | ||
| val itemAdapter = PredictiveItemAdapter() | ||
| binding.recyclerView.apply { | ||
| adapter = itemAdapter | ||
| addOnViewHolderSelectedListener(object : OnViewHolderSelectedListener { | ||
| override fun onViewHolderSelected( | ||
| parent: RecyclerView, | ||
| child: RecyclerView.ViewHolder?, | ||
| position: Int, | ||
| subPosition: Int, | ||
| ) { | ||
| viewModel.loadMore(position) | ||
| } | ||
| }) | ||
| requestFocus() | ||
| } | ||
| viewModel.getItems().observe(viewLifecycleOwner) { items -> | ||
| itemAdapter.submitList(items) | ||
| } | ||
| } | ||
|
|
||
| class PredictiveItemAdapter( | ||
| ) : MutableListAdapter<Int, DpadComposeFocusViewHolder<Int>>(MutableGridAdapter.DIFF_CALLBACK) { | ||
|
|
||
| override fun onCreateViewHolder( | ||
| parent: ViewGroup, | ||
| viewType: Int, | ||
| ): DpadComposeFocusViewHolder<Int> { | ||
| return when (viewType) { | ||
| ListTypes.ITEM -> { | ||
| DpadComposeFocusViewHolder(parent) { item -> | ||
| ItemComposable( | ||
| modifier = Modifier.fillMaxWidth().height(200.dp), | ||
| item = item, | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| else -> { | ||
| DpadComposeFocusViewHolder( | ||
| parent, | ||
| isFocusable = false | ||
| ) { | ||
| PlaceholderComposable( | ||
| Modifier.fillMaxWidth().height(300.dp), | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| override fun onBindViewHolder(holder: DpadComposeFocusViewHolder<Int>, position: Int) { | ||
| val item = getItem(position) | ||
| holder.setItemState(item) | ||
| holder.itemView.contentDescription = item.toString() | ||
| } | ||
|
|
||
| override fun getItemViewType(position: Int): Int { | ||
| val item = getItem(position) | ||
| return if (item >= 0) { | ||
| ListTypes.ITEM | ||
| } else { | ||
| ListTypes.LOADING | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
|
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|
|
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| class PredictiveAnimationViewModel : ViewModel() { | ||
|
|
||
| private val totalItems = 10 | ||
| private var offset = 0 | ||
| private var isLoadingMore = false | ||
| private val liveData = MutableLiveData<MutableList<Int>>() | ||
| private val dispatcher = Dispatchers.Default | ||
|
|
||
| init { | ||
| loadFirstPage() | ||
| } | ||
|
|
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| fun getItems(): LiveData<MutableList<Int>> = liveData | ||
|
|
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| private fun loadFirstPage() { | ||
| viewModelScope.launch(dispatcher) { | ||
| val newList = mutableListOf<Int>() | ||
| repeat(totalItems) { | ||
| newList.add(it) | ||
| } | ||
| liveData.postValue(newList.toMutableList()) | ||
| offset = totalItems | ||
| } | ||
| } | ||
|
|
||
| fun loadMore(selectedPosition: Int) { | ||
| if (isLoadingMore) { | ||
| return | ||
| } | ||
| if (selectedPosition < offset - 2) { | ||
| return | ||
| } | ||
| isLoadingMore = true | ||
| viewModelScope.launch(dispatcher) { | ||
| val currentList = liveData.value!! | ||
| val loadingList = currentList + mutableListOf(-1) | ||
| liveData.postValue(loadingList.toMutableList()) | ||
| delay(5000L) | ||
|
|
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| val newList = MutableList(totalItems + offset) { it } | ||
| liveData.postValue(newList) | ||
| offset = newList.size | ||
| isLoadingMore = false | ||
| } | ||
| } | ||
| } | ||
|
|
||
| } |
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