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package ca.allanwang.kau.ui.views
import android.content.Context
import android.graphics.Rect
import android.support.v7.widget.CardView
import android.util.AttributeSet
import ca.allanwang.kau.ui.R
import ca.allanwang.kau.utils.parentViewGroup
/**
* Created by Allan Wang on 2017-06-26.
*
* CardView with a limited height
* This view should be used with wrap_content as its height
* Defaults to at most the parent's visible height
*/
class BoundedCardView @JvmOverloads constructor(
context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : CardView(context, attrs, defStyleAttr) {
/**
* Maximum height possible, defined in dp (will be converted to px)
* Defaults to parent's visible height
*/
var maxHeight: Int = -1
/**
* Percentage of resulting max height to fill
* Negative value = fill all of maxHeight
*/
var maxHeightPercent: Float = -1.0f
private val parentFrame = Rect()
init {
if (attrs != null) {
val styledAttrs = context.obtainStyledAttributes(attrs, R.styleable.BoundedCardView)
maxHeight = styledAttrs.getDimensionPixelSize(R.styleable.BoundedCardView_maxHeight, -1)
maxHeightPercent = styledAttrs.getFloat(R.styleable.BoundedCardView_maxHeightPercent, -1.0f)
styledAttrs.recycle()
}
}
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
parentViewGroup.getWindowVisibleDisplayFrame(parentFrame)
var maxMeasureHeight = if (maxHeight > 0) maxHeight else parentFrame.height()
if (maxHeightPercent > 0f) maxMeasureHeight = (maxMeasureHeight * maxHeightPercent).toInt()
val trueHeightMeasureSpec = MeasureSpec.makeMeasureSpec(maxMeasureHeight, MeasureSpec.AT_MOST)
super.onMeasure(widthMeasureSpec, trueHeightMeasureSpec)
}
}
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