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#2 Support attaching multiple RecyclerView (#3)

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Adrian Kuta
2024-07-30 10:53:41 +02:00
committed by GitHub
parent cc5cc07f4a
commit f1cfc2a98a
1 changed files with 40 additions and 25 deletions
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65
dragdrop/src/main/kotlin/dev/adriankuta/unbounddragdrop/DragDropHelper.kt
View File

@@ -6,15 +6,15 @@ import android.view.View
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.DRAG_FLAG_OPAQUE
import androidx.recyclerview.widget.RecyclerView.ViewHolder
/**
* Helper class to handle drag and drop functionality in a RecyclerView.
* Helper class to handle drag and drop functionality in multiple RecyclerViews.
*
* @param callback A Callback object to handle the drag and drop events.
*/
class DragDropHelper(callback: Callback) :
RecyclerView.OnChildAttachStateChangeListener {
private var mRecyclerView: RecyclerView? = null
private var recyclerItemClickListener: RecyclerItemClickListener? = null
class DragDropHelper(private val callback: Callback) : RecyclerView.OnChildAttachStateChangeListener {
private val recyclerViews = mutableListOf<RecyclerView>()
private val recyclerItemClickListeners = mutableMapOf<RecyclerView, RecyclerItemClickListener>()
private val dropListener = DropListener(callback)
private val onItemLongClickListener: RecyclerItemClickListener.OnItemLongClickListener by lazy {
object : RecyclerItemClickListener.OnItemLongClickListener {
@@ -39,30 +39,42 @@ class DragDropHelper(callback: Callback) :
* @param recyclerView The RecyclerView to attach to.
*/
fun attachToRecyclerView(recyclerView: RecyclerView?) {
if (mRecyclerView === recyclerView) {
return // nothing to do
recyclerView?.let {
if (recyclerViews.contains(it)) return // already attached
recyclerViews.add(it)
setupCallbacks(it)
}
if (mRecyclerView != null) {
destroyCallbacks()
}
mRecyclerView = recyclerView
mRecyclerView?.let {
setupCallbacks()
}
/**
* Detaches the DragDropHelper from the specified RecyclerView.
*
* @param recyclerView The RecyclerView to detach from.
*/
fun detachFromRecyclerView(recyclerView: RecyclerView?) {
recyclerView?.let {
if (!recyclerViews.contains(it)) return // not attached
destroyCallbacks(it)
recyclerViews.remove(it)
}
}
/**
* Sets up the necessary callbacks for the RecyclerView.
*
* @param recyclerView The RecyclerView to setup callbacks for.
*/
private fun setupCallbacks() {
mRecyclerView?.apply {
recyclerItemClickListener = RecyclerItemClickListener(
private fun setupCallbacks(recyclerView: RecyclerView) {
recyclerView.apply {
val clickListener = RecyclerItemClickListener(
context,
this,
onItemLongClickListener
).also {
mRecyclerView?.addOnItemTouchListener(it)
}
)
recyclerItemClickListeners[this] = clickListener
addOnItemTouchListener(clickListener)
addOnChildAttachStateChangeListener(this@DragDropHelper)
setOnDragListener(dropListener)
}
@@ -70,13 +82,16 @@ class DragDropHelper(callback: Callback) :
/**
* Removes the callbacks from the RecyclerView.
*
* @param recyclerView The RecyclerView to remove callbacks from.
*/
private fun destroyCallbacks() {
recyclerItemClickListener?.let {
mRecyclerView?.removeOnItemTouchListener(it)
private fun destroyCallbacks(recyclerView: RecyclerView) {
recyclerItemClickListeners[recyclerView]?.let {
recyclerView.removeOnItemTouchListener(it)
recyclerItemClickListeners.remove(recyclerView)
}
mRecyclerView?.removeOnChildAttachStateChangeListener(this)
mRecyclerView?.setOnDragListener(null)
recyclerView.removeOnChildAttachStateChangeListener(this)
recyclerView.setOnDragListener(null)
}
/**
@@ -133,4 +148,4 @@ class DragDropHelper(callback: Callback) :
targetViewHolder: ViewHolder?
)
}
}
}