mihon/app/src/main/java/eu/kanade/tachiyomi/widget/NegativeSeekBar.kt

package eu.kanade.tachiyomi.widget

import android.content.Context
import android.os.Parcelable
import android.util.AttributeSet
import android.widget.SeekBar
import eu.kanade.tachiyomi.R


class NegativeSeekBar @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null) :
        SeekBar(context, attrs) {

    private var minValue: Int = 0
    private var maxValue: Int = 0
    private var listener: OnSeekBarChangeListener? = null

    init {
        val styledAttributes = context.obtainStyledAttributes(
                attrs,
                R.styleable.NegativeSeekBar, 0, 0)

        try {
            setMinSeek(styledAttributes.getInt(R.styleable.NegativeSeekBar_min_seek, 0))
            setMaxSeek(styledAttributes.getInt(R.styleable.NegativeSeekBar_max_seek, 0))
        } finally {
            styledAttributes.recycle()
        }

        super.setOnSeekBarChangeListener(object : OnSeekBarChangeListener {
            override fun onProgressChanged(seekBar: SeekBar?, value: Int, fromUser: Boolean) {
                listener?.let { it.onProgressChanged(seekBar, minValue + value, fromUser) }
            }

            override fun onStartTrackingTouch(p0: SeekBar?) {
                listener?.let { it.onStartTrackingTouch(p0) }
            }

            override fun onStopTrackingTouch(p0: SeekBar?) {
                listener?.let { it.onStopTrackingTouch(p0) }
            }
        })
    }

    override fun setProgress(progress: Int) {
        super.setProgress(Math.abs(minValue) + progress)
    }

    fun setMinSeek(minValue: Int) {
        this.minValue = minValue
        max = (this.maxValue - this.minValue)
    }

    fun setMaxSeek(maxValue: Int) {
        this.maxValue = maxValue
        max = (this.maxValue - this.minValue)
    }

    override fun setOnSeekBarChangeListener(listener: OnSeekBarChangeListener?) {
        this.listener = listener
    }

    override fun onRestoreInstanceState(state: Parcelable?) {
        // We can't restore the progress from the saved state because it gets shifted.
        val origProgress = progress
        super.onRestoreInstanceState(state)
        super.setProgress(origProgress)
    }

}