Is there a provided way that we have to interpret a hex string color, or is the best way to do somet...

# compose-desktop

[spierce7]

Is there a provided way that we have to interpret a hex string color, or is the best way to do something like

colorString.removePrefix("#").toInt(16)

[Kirill Grouchnikov]

What does interpret mean?

[Thomas]

Your function would fail for colours with an alpha value. Try parsing #FFFFFFFF. Probably you should use Long.

[spierce7]

@Kirill Grouchnikov interpret = parse

[spierce7]

@Thomas I ended up running into both of those issues. Thanks. Especially since Color assumes ARGB.

I ended up just making the following function:

fun String.hexStringToColor(): Color {
    val colorString = removePrefix("#")
    val argb = colorString.toUInt(16)

    val b: Int = (argb and 0xFFu).toInt()
    val g: Int = (argb shr 8 and 0xFFu).toInt()
    val r: Int = (argb shr 16 and 0xFFu).toInt()
    val a: Int = (argb shr 24 and 0xFFu).toInt()

    return when (colorString.length) {
        6 -> Color(red = r, green = g, blue = b)
        8 -> Color(red = r, green = g, blue = b, alpha = a)
        else -> throw IllegalArgumentException("Unexpected hex color value in String: '$this'")
    }
}

[Thomas]

Your code still uses toInt so it crashes with #FFFFFFFF

[spierce7]

yeah - I have it working with Long. I was playing around in my head with whether or not UInt would work

[spierce7]

UInt appears to work. Fun fact, UInt.MAX_VALUE == 0xFFFFFFFFu

First time I’ve ever found a use for UInt in my code 😛