SwipeLibrary/SwipeToDelete/src/main/java/com/kedia/swipetodelete/SwipeToDelete.kt at 0aa4e5faac87ea33db7e66553a15b9225079f082 · pknotfound/SwipeLibrary · GitHub

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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,
        @ColorInt colorOneInt: Int? = null,
        @ColorInt colorTwoInt: Int? = null
    ) {

        var swipeDirs = RIGHT
        for (element in list) {
            if (element != DIRECTION.RIGHT) {
                swipeDirs = swipeDirs or DIRECTION.valueOf(element.name).direction
            }
        }

        val simpleCallback = object : ItemTouchHelper.SimpleCallback(0 , swipeDirs) {
            override fun onMove(
                recyclerView: RecyclerView,
                viewHolder: RecyclerView.ViewHolder,
                target: RecyclerView.ViewHolder
            ): Boolean {
                return false
            }

            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
                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)
    }

    enum class DIRECTION(val direction: Int) {
        UP (ItemTouchHelper.UP),
        DOWN(ItemTouchHelper.DOWN),
        RIGHT(ItemTouchHelper.RIGHT),
        LEFT(ItemTouchHelper.LEFT)
    }

}