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GridActivity.kt
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GridActivity.kt
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package com.spundev.activitysharedelements
import android.content.Context
import android.content.Intent
import android.os.Bundle
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.spundev.activitysharedelements.DetailActivity.Companion.SELECTED_ITEM_POSITION
import com.spundev.activitysharedelements.adapter.GridAdapter
import com.spundev.commonresources.data.ResourcesData
class GridActivity : AppCompatActivity() {
lateinit var recyclerView: RecyclerView
private var selectedItem: Int = RecyclerView.NO_POSITION
companion object {
fun start(context: Context) {
val starter = Intent(context, GridActivity::class.java)
context.startActivity(starter)
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.ase_activity_grid)
recyclerView = findViewById(R.id.recyclerview)
val adapter = GridAdapter(this) { id, view ->
DetailActivity.start(this, id, view, ResourcesData.instance[id].transitionName)
}
recyclerView.adapter = adapter
recyclerView.layoutManager = GridLayoutManager(this, 3)
adapter.submitList(ResourcesData.instance)
}
override fun onActivityReenter(requestCode: Int, data: Intent) {
supportPostponeEnterTransition()
// Retrieve position of the item
selectedItem = data.getIntExtra(SELECTED_ITEM_POSITION, RecyclerView.NO_POSITION)
if (selectedItem != RecyclerView.NO_POSITION) {
scrollToSelectedItem()
}
}
private val layoutChangeListener = object : View.OnLayoutChangeListener {
override fun onLayoutChange(v: View?, l: Int, t: Int, r: Int, b: Int, oL: Int, oT: Int, oR: Int, oB: Int) {
// Get RecyclerView layoutManager
recyclerView.layoutManager?.let { layoutManager ->
// Check if the viewAtPosition is not null
layoutManager.findViewByPosition(selectedItem)?.let { viewAtPosition ->
// Check if the view is completely visible
if (layoutManager.isViewPartiallyVisible(viewAtPosition, true, true)) {
// If viewAtPosition exists and is fully visible, continue postponed transition
// and remove listener
recyclerView.removeOnLayoutChangeListener(this)
supportStartPostponedEnterTransition()
}
}
}
}
}
private fun scrollToSelectedItem() {
// Add change listener to the RecyclerView
recyclerView.addOnLayoutChangeListener(layoutChangeListener)
// Get RecyclerView layoutManager and check if null
recyclerView.layoutManager?.let { layoutManager ->
// Check if view exists and if is partial or fully visible
val viewAtPosition = layoutManager.findViewByPosition(selectedItem)
if (viewAtPosition != null && layoutManager.isViewPartiallyVisible(viewAtPosition, true, true)) {
// If viewAtPosition exists and is fully visible, continue postponed transition
// and remove listener
recyclerView.removeOnLayoutChangeListener(layoutChangeListener)
supportStartPostponedEnterTransition()
} else {
// if view doesn't exists or is not fully visible, scroll to position
recyclerView.post { layoutManager.scrollToPosition(selectedItem) }
}
}
}
}