WrapHeightViewPager

WrapHeightViewPager.kt

/**
 * wrap_contentを対応できるようにしたViewPager
 */
class WrapHeightViewPager @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null
) : ViewPager(context, attrs) {

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        var localHeightMeasureSpec = heightMeasureSpec

        var height = 0
        children.forEach {
            it.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED))
            val h = it.measuredHeight
            if (h > height) height = h
        }

        if (height != 0) {
            localHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY)
        }
        super.onMeasure(widthMeasureSpec, localHeightMeasureSpec)
    }
}