medium_atvasis_alignImageToText.kt

interface DrawableHeightComputeMode {
    fun computeHeight(textPaint: TextPaint, text: CharSequence): Int
}

fun TextView.alignImageToText(textPaint: TextPaint, drawableHeightComputer: DrawableHeightComputeMode) {
    (text as? SpannedString)?.getSpans(0, text.length, DynamicDrawableSpan::class.java)?.forEach {
        val drawable = it.drawable
        val ratio = drawable.intrinsicWidth.toFloat() / drawable.intrinsicHeight
        val fontHeight = drawableHeightComputer.computeHeight(textPaint, text)
        val drawableWidth = truncate(fontHeight * ratio).toInt()
        drawable.setBounds(0, 0, drawableWidth, fontHeight)
    }
}

//Example of DrawableHeightComputeMode
class AscentDrawableHeightComputeMode : DrawableHeightComputeMode {
    override fun computeHeight(textPaint: TextPaint, text: CharSequence): Int {
        return -textPaint.fontMetricsInt.ascent
    }
}