Implemented drag-and-drop reordering ability in quote recycler view; refactored project structure

2023-05-15 14:16:48 +02:00
parent 252c69a3ef
commit e0e7a4cbe0
15 changed files with 121 additions and 115 deletions
@@ -0,0 +1,83 @@
+package com.denizd.textbasic.adapter
+
+import android.text.Editable
+import android.text.TextWatcher
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ImageButton
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+import com.denizd.textbasic.R
+import java.util.Collections
+
+class QuoteAdapter(
+    quotes: List<String>,
+) : RecyclerView.Adapter<QuoteAdapter.QuoteViewHolder>(),
+    RecyclerRowMoveCallback.RecyclerViewTouchHelperContract {
+
+    private var mutableQuotes: MutableList<String> = quotes.toMutableList()
+
+    class QuoteViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+
+        val quote: TextView = view.findViewById(R.id.quote)
+        val delete: ImageButton = view.findViewById(R.id.delete_button)
+    }
+
+//    override fun getItemViewType(position: Int): Int {
+//        return /*if (position == itemCount - 1) 1 else*/ 0
+//    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): QuoteViewHolder {
+            val v = LayoutInflater.from(parent.context).inflate(R.layout.quote_entry, parent, false)
+            return QuoteViewHolder(v)
+    }
+
+    override fun onBindViewHolder(holder: QuoteViewHolder, position: Int) {
+        val currentItem = mutableQuotes[position]
+
+        holder.quote.text = currentItem
+
+        holder.quote.addTextChangedListener(object : TextWatcher {
+            override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {}
+            override fun afterTextChanged(p0: Editable?) {}
+            override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
+                mutableQuotes[holder.layoutPosition] = p0.toString()
+            }
+        })
+
+        holder.delete.setOnClickListener {
+            mutableQuotes.removeAt(holder.layoutPosition)
+            notifyItemRemoved(holder.layoutPosition)
+        }
+    }
+
+    override fun getItemCount(): Int = mutableQuotes.size
+
+    fun addNewQuote() {
+        mutableQuotes.add("")
+        notifyItemInserted(mutableQuotes.size + 1)
+    }
+
+    fun getAllQuotes(): Array<String> {
+        return mutableQuotes.filter { s -> s.isNotBlank() }.toTypedArray()
+    }
+
+    override fun onRowMoved(from: Int, to: Int) {
+        if (from < to) for (i in from until to) {
+            Collections.swap(mutableQuotes, i, i + 1)
+        } else for (i in to downTo from - 1) {
+            Collections.swap(mutableQuotes, i, i - 1)
+        }
+
+        notifyItemMoved(from, to)
+    }
+
+    override fun onRowSelected(viewHolder: QuoteViewHolder) {
+        // TODO
+    }
+
+    override fun onRowClear(viewHolder: QuoteViewHolder) {
+        // TODO
+    }
+}
@@ -0,0 +1,55 @@
+package com.denizd.textbasic.adapter
+
+import androidx.recyclerview.widget.ItemTouchHelper
+import androidx.recyclerview.widget.RecyclerView
+
+
+class RecyclerRowMoveCallback(
+    private val touchHelperContract: RecyclerViewTouchHelperContract,
+) : ItemTouchHelper.Callback() {
+
+    override fun isLongPressDragEnabled(): Boolean {
+        return true
+    }
+
+    override fun isItemViewSwipeEnabled(): Boolean {
+        return false
+    }
+
+    override fun getMovementFlags(
+        recyclerView: RecyclerView,
+        viewHolder: RecyclerView.ViewHolder,
+    ): Int = makeMovementFlags(ItemTouchHelper.UP or ItemTouchHelper.DOWN, 0)
+
+    override fun onMove(
+        recyclerView: RecyclerView,
+        viewHolder: RecyclerView.ViewHolder,
+        target: RecyclerView.ViewHolder
+    ): Boolean {
+        touchHelperContract.onRowMoved(viewHolder.adapterPosition, target.adapterPosition)
+        return false
+    }
+
+    override fun onSelectedChanged(
+        viewHolder: RecyclerView.ViewHolder?,
+        actionState: Int,
+    ) {
+        if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
+            touchHelperContract.onRowSelected(viewHolder as QuoteAdapter.QuoteViewHolder)
+        }
+        super.onSelectedChanged(viewHolder, actionState)
+    }
+
+    override fun clearView(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder) {
+        super.clearView(recyclerView, viewHolder)
+        touchHelperContract.onRowClear(viewHolder as QuoteAdapter.QuoteViewHolder)
+    }
+
+    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {}
+
+    interface RecyclerViewTouchHelperContract {
+        fun onRowMoved(from: Int, to: Int)
+        fun onRowSelected(viewHolder: QuoteAdapter.QuoteViewHolder)
+        fun onRowClear(viewHolder: QuoteAdapter.QuoteViewHolder)
+    }
+}