Drag n drop

README.md

@@ -1,3 +1,63 @@
 # SwipeLibrary
 
-Extension Library to add swipe functionality to the RecyclerView
+SwipeLibrary provides extension functions for handling swipe actions in RecyclerView. 
+
+You can add **Swipe To Delete** and **Drag and Shift** like functionalities with just one line of code.
+
+
+# Extension Functions
+
+SwipeLibrary contains the following functions:
+- [Swipe To Delete](#swipe-to-delete)
+- [Drag to Shift](#drag-to-shift)
+
+## Swipe To Delete
+
+Add swipe to delete RecyclerView's items from the list, which a single line of code.
+
+Use *addSwipeToDelete* as RecyclerView's extension function, to add this functionality to your RecyclerView. 
+This extension function has **two** optional parameter. 
+> The first parameter is the list of directions in which swipe should be allowed. The directions can be either **TOP**, **BOTTOM**, **RIGHT**, **LEFT**.
+The list of directions can be made like this,
+		`val list = listOf(SwipeToDelete.DIRECTION.LEFT,SwipeToDelete.DIRECTION.RIGHT)`
+If no value is passed for the list, by default, **RIGHT** is the direction for swipe.
+
+> The second parameter is the *listener* for the interface method. The by default value of this parameter is null. If passed, the activity/fragment should implement `SwipeToDelete.OnSwiped`. This method will be called when the RecyclerView item is swiped out, and it returns the position of the element that was swiped. 
+
+**Implementation of interface method**
+In a notes app, if you wish to delete the note from your database, after it is swiped, then you can used this method to perform the action. The note can be deleted by getting the *NOTE* using the adapter position inside the list passed to RecyclerView Adapter.
+
+        override fun swipeToDelete(adapterPosition: Int) {  
+		adapter.removeItem(adapterPosition)  
+		}
+
+> The third parameter is an optional parameter, for the Color integer, if the user wants a color in the background when the view is swiped out. This is how the user can pass the Color int as the parameter, `ContextCompat.getColor(this, R.color.colorAccent)`
+
+[![rec-2020-10-24_14.38.15.gif](https://s8.gifyu.com/images/rec-2020-10-24_14.38.15.gif)](https://gifyu.com/image/8FMg)
+
+
+> The fourth parameter is an optional parameter, for the second Color integer, if the user wants two colors in the background, the user can pass both **Parameter 3 and Parameter 4**.
+
+[![rec-2020-10-24_14.43.59.gif](https://s8.gifyu.com/images/rec-2020-10-24_14.43.59.gif)](https://gifyu.com/image/8Fpk)
+
+
+---		
+***
+___
+
+## Drag To Shift
+
+Highlight, move and shift items of RecyclerView with just a single line of code.
+Use *addDragToSwipe* as RecyclerView's extension function, to add this functionality to your RecyclerView. This extension has **one** optional parameter.
+
+> The parameter is the listener for the interface method. The by default value for this parameter is null. If passed, the activity/fragment should implement `DragAndDrop.onDragged`. This method will be called when the RecyclerView item is dragged and dropped to some other position, and it returns the two positions that were swapped.	
+
+**Implementation of interface method** :- 
+In a notes app, if you wish to change positions of two notes in your database, after they are swapped, then you can used this method to perform the action. The notes can be swapped by getting the _NOTES_ using the adapter positions inside the list passed to RecyclerView Adapter.
+
+    	override fun onPositionDragged(positionStart: Int, positionEnd: Int) {  
+			adapter.moveItem(positionStart, positionEnd)  
+		}
+
+[![rec-2020-10-24_00.10.0459f8d3ce489a4f0f.gif](https://s8.gifyu.com/images/rec-2020-10-24_00.10.0459f8d3ce489a4f0f.gif)](https://gifyu.com/image/8jl5)
+

SwipeToDelete/src/main/java/com/kedia/swipetodelete/DragAndDrop.kt

@@ -13,7 +13,7 @@ object DragAndDrop: View.OnTouchListener, GestureDetector.OnGestureListener {
 
     private lateinit var holder: RecyclerView.ViewHolder
 
-    fun RecyclerView.addDragToSwipe(): ItemTouchHelper {
+    fun RecyclerView.addDragToSwipe(listener: onDragged? = null): ItemTouchHelper {
 
         val itemTouchCallback = object : ItemTouchHelper.Callback() {
             override fun onSelectedChanged(viewHolder: RecyclerView.ViewHolder?, actionState: Int) {
@@ -52,7 +52,8 @@ object DragAndDrop: View.OnTouchListener, GestureDetector.OnGestureListener {
                 viewHolder: RecyclerView.ViewHolder,
                 target: RecyclerView.ViewHolder
             ): Boolean {
-                (adapter as ItemTouchHelperAdapter).onItemMove(viewHolder.adapterPosition, target.adapterPosition)
+                listener?.onPositionDragged(viewHolder.adapterPosition, target.adapterPosition)
+                adapter?.notifyItemMoved(viewHolder.adapterPosition, target.adapterPosition)
                 return true
             }
 
@@ -111,4 +112,8 @@ object DragAndDrop: View.OnTouchListener, GestureDetector.OnGestureListener {
         return false
     }
 
+    interface onDragged {
+        fun onPositionDragged(positionStart: Int, positionEnd: Int)
+    }
+
 }

app/src/main/java/com/kedia/customswipelibrary/Adapter.kt

@@ -1,17 +1,17 @@
 package com.kedia.customswipelibrary
 
 import android.content.Context
+import android.util.Log
 import android.view.GestureDetector
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.TextView
 import androidx.recyclerview.widget.RecyclerView
-import com.kedia.swipetodelete.ItemTouchHelperAdapter
 
 class Adapter(
     private val context: Context,
-    private val list: List<String>
+    private val list: MutableList<String>
 ): RecyclerView.Adapter<Adapter.CustomViewHolder>() {
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CustomViewHolder {
@@ -26,63 +26,19 @@ class Adapter(
         holder.bind(list[position])
     }
 
-    inner class CustomViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
-//        GestureDetector.OnGestureListener, View.OnTouchListener
-                {
+    fun moveItem(positionStart: Int, positionEnd: Int) {
+        val temp = list[positionEnd]
+        list[positionEnd] = list[positionStart]
+        list[positionStart] = temp
+    }
+
+    inner class CustomViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
 
         private var textView = itemView.findViewById<TextView>(R.id.textView)
-        private lateinit var gestureDetector: GestureDetector
 
         fun bind(string: String) {
             textView.text = string
-      //      textView.setGestures()
-//            gestureDetector = GestureDetector(itemView.context, this)
-//            itemView.setOnTouchListener(this)
         }
-
-//        override fun onDown(e: MotionEvent?): Boolean {
-//            return false
-//        }
-//
-//        override fun onShowPress(e: MotionEvent?) {}
-//
-//        override fun onSingleTapUp(e: MotionEvent?): Boolean {
-//
-//            return false
-//        }
-//
-//        override fun onScroll(
-//            e1: MotionEvent?,
-//            e2: MotionEvent?,
-//            distanceX: Float,
-//            distanceY: Float
-//        ): Boolean {
-//            return false
-//        }
-//
-//        override fun onLongPress(e: MotionEvent?) {
-//            Log.d("TAG!!!!","called long")
-//            touchHelper?.startDrag(this)
-//        }
-//
-//        override fun onFling(
-//            e1: MotionEvent?,
-//            e2: MotionEvent?,
-//            velocityX: Float,
-//            velocityY: Float
-//        ): Boolean {
-//            return false
-//        }
-
-//        override fun onTouch(v: View?, event: MotionEvent?): Boolean {
-//            gestureDetector.onTouchEvent(event)
-//            return true
-//        }
-
     }
 
-//    override fun onItemMove(fromPosition: Int, toPosition: Int) {
-//        notifyItemMoved(fromPosition, toPosition)
-//    }
-
 }

app/src/main/java/com/kedia/customswipelibrary/MainActivity.kt

@@ -1,15 +1,14 @@
 package com.kedia.customswipelibrary
 
-import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 import android.util.Log
+import androidx.appcompat.app.AppCompatActivity
 import androidx.recyclerview.widget.LinearLayoutManager
-import com.kedia.swipetodelete.SwipeToDelete
+import com.kedia.swipetodelete.DragAndDrop
 import com.kedia.swipetodelete.DragAndDrop.addDragToSwipe
-import com.kedia.swipetodelete.SwipeToDelete.addSwipeToDelete
 import kotlinx.android.synthetic.main.activity_main.*
 
-class MainActivity : AppCompatActivity(), SwipeToDelete.OnSwiped {
+class MainActivity : AppCompatActivity(), DragAndDrop.onDragged {
 
     private val list = mutableListOf<String>()
     private lateinit var adapter: Adapter
@@ -26,15 +25,12 @@ class MainActivity : AppCompatActivity(), SwipeToDelete.OnSwiped {
             layoutManager = LinearLayoutManager(this@MainActivity)
             adapter = this@MainActivity.adapter
         }
+        recycler.addDragToSwipe(this)
 
-        recycler.addDragToSwipe()
-
-        val list = listOf(SwipeToDelete.DIRECTION.LEFT,
-            SwipeToDelete.DIRECTION.RIGHT)
-        recycler.addSwipeToDelete(list, this)
     }
 
-    override fun swipeToDelete(adapterPosition: Int) {
-        Log.d("TAG!!!!", adapter.itemCount.toString())
+    override fun onPositionDragged(positionStart: Int, positionEnd: Int) {
+        adapter.moveItem(positionStart, positionEnd)
     }
+
 }