Swipe to delete

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/SwipeToDelete.kt

@@ -1,14 +1,21 @@
 package com.kedia.swipetodelete
 
+import android.graphics.Canvas
+import android.graphics.Color
+import androidx.annotation.ColorInt
 import androidx.recyclerview.widget.ItemTouchHelper
 import androidx.recyclerview.widget.ItemTouchHelper.RIGHT
 import androidx.recyclerview.widget.RecyclerView
+import java.lang.Exception
+
 
 object SwipeToDelete  {
 
     fun RecyclerView.addSwipeToDelete(
         list: List<DIRECTION> = emptyList(),
-        listener: OnSwiped? = null
+        listener: OnSwiped? = null,
+        @ColorInt colorOneInt: Int? = null,
+        @ColorInt colorTwoInt: Int? = null
     ) {
 
         var swipeDirs = RIGHT
@@ -28,14 +35,52 @@ object SwipeToDelete  {
             }
 
             override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
-                this@addSwipeToDelete.adapter?.notifyItemRemoved(viewHolder.adapterPosition)
                 listener?.swipeToDelete(adapterPosition = viewHolder.adapterPosition)
+                this@addSwipeToDelete.adapter?.notifyItemRemoved(viewHolder.adapterPosition)
             }
 
+            override fun onChildDraw(
+                c: Canvas,
+                recyclerView: RecyclerView,
+                viewHolder: RecyclerView.ViewHolder,
+                dX: Float,
+                dY: Float,
+                actionState: Int,
+                isCurrentlyActive: Boolean
+            ) {
+                c.clipRect(0f, viewHolder.itemView.top.toFloat(),
+                    dX, viewHolder.itemView.bottom.toFloat())
+
+                if (colorTwoInt != null && colorOneInt == null)
+                    throw Exception("Color One cannot be null if Color Two is non null")
+
+                if (colorTwoInt == null) {
+                        colorOneInt?.apply { c.drawColor(this) }
+                } else {
+                    if(dX < width / 2)
+                        colorOneInt?.apply { c.drawColor(this) }
+                    else
+                        colorTwoInt?.apply { c.drawColor(this) }
+                }
+
+                super.onChildDraw(
+                    c,
+                    recyclerView,
+                    viewHolder,
+                    dX,
+                    dY,
+                    actionState,
+                    isCurrentlyActive
+                )
+            }
         }
         ItemTouchHelper(simpleCallback).attachToRecyclerView(this)
     }
 
+    private fun Float.isPositive(): Boolean {
+        return this > 0
+    }
+
     interface OnSwiped {
         fun swipeToDelete(adapterPosition: Int)
     }

SwipeToDelete/src/main/res/drawable/ic_background.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape android:shape="rectangle"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <stroke android:width="2dp"
+        android:color="@color/colorPrimaryDark" />
+
+</shape>

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

@@ -9,7 +9,7 @@ import androidx.recyclerview.widget.RecyclerView
 
 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 {
@@ -24,6 +24,10 @@ class Adapter(
         holder.bind(list[position])
     }
 
+    fun removeItem(adapterPosition: Int) {
+        list.removeAt(adapterPosition)
+    }
+
     inner class CustomViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
 
         private var textView = itemView.findViewById<TextView>(R.id.textView)

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

@@ -1,9 +1,11 @@
 package com.kedia.customswipelibrary
 
 import android.os.Bundle
+import android.util.Log
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+import androidx.core.content.res.ResourcesCompat
 import androidx.recyclerview.widget.LinearLayoutManager
-import com.kedia.swipetodelete.DragAndDrop.addDragToSwipe
 import com.kedia.swipetodelete.SwipeToDelete
 import com.kedia.swipetodelete.SwipeToDelete.addSwipeToDelete
 import kotlinx.android.synthetic.main.activity_main.*
@@ -26,14 +28,12 @@ class MainActivity : AppCompatActivity(), SwipeToDelete.OnSwiped {
             adapter = this@MainActivity.adapter
         }
 
-        recycler.addDragToSwipe()
-
         val list = listOf(SwipeToDelete.DIRECTION.LEFT,
             SwipeToDelete.DIRECTION.RIGHT)
         recycler.addSwipeToDelete(list, this)
     }
 
     override fun swipeToDelete(adapterPosition: Int) {
-
+        adapter.removeItem(adapterPosition)
     }
 }