Feature Request: setColor(color: Int)

[Douglas Gadêlha]

Hello,

First of all I'd like to thank for this library, it's great: simple and beautiful.

The main thing it misses right now is the following method: setColor(color: Int), allowing us to change the selected color.

Thanks!

[sephi0485]

Also me I would like to have this method.

[Sujeet Shetty]

After much look around in code I found a solution for setColor but this method has to be called after the seekBar is rendered.
Added the below method in ColorSeekBar.kt

  fun setColor(color: Int) {
     val barLeft: Int = paddingStart.toInt()
     val barRight: Int = (measuredWidth.toFloat() - paddingEnd).toInt()
     var newColor = barLeft
     var xvalue = barLeft
     for (i in barLeft..barRight) {
         if (color == pickColor(i.toFloat(), measuredWidth)) {
             newColor = pickColor(i.toFloat(), measuredWidth)
             xvalue = i
             break
         }
     }
     thumbX = xvalue.toFloat()
     thumbPaint.color = newColor
     invalidate()
 }

And if you want the onColorChangeListener then add the below line of Code after thumbPaint.color = newColor :
colorChangeListener?.onColorChangeListener(newColor)

[Gadiq]

Small addition to the post above: it searches to the nearest color, because in most cases it will not find exact same color.

fun setColor(color: Int) {
    val barLeft: Int = paddingStart.toInt()
    val barRight: Int = (measuredWidth.toFloat() - paddingEnd).toInt()
    var minDistance = Int.MAX_VALUE
    var distance : Int
    var resultIndex = 0

    for (i in barLeft..barRight) {
        val pickedColor = pickColor(i.toFloat(), measuredWidth)

        distance = colorDistance(pickedColor, color)

        if (minDistance > distance) {
            minDistance = distance

            resultIndex = i
        }
    }
    thumbX = resultIndex.toFloat()
    thumbPaint.color = pickColor(resultIndex.toFloat(), measuredWidth)

    invalidate()
}

fun colorDistance(c1 : Int, c2 : Int) : Int {
    return Math.abs(Color.red(c1) - Color.red(c2)) + Math.abs(Color.green(c1) - Color.green(c2)) + Math.abs(Color.blue(c1) - Color.blue(c2))
}