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class FixedEndLinearLayout @JvmOverloads constructor(
context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : LinearLayout(context, attrs, defStyleAttr) {
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
val widthSize = MeasureSpec.getSize(widthMeasureSpec)
val widthMode = MeasureSpec.getMode(widthMeasureSpec)
val heightSize = MeasureSpec.getSize(heightMeasureSpec)
val heightMode = MeasureSpec.getMode(heightMeasureSpec)
if (childCount != 2) throw RuntimeException("FixedEndLinearLayout must have 2 children.")
val wrapChild = getChildAt(0)
val fixedChild = getChildAt(1)
measureChild(fixedChild, widthMeasureSpec, heightMeasureSpec)
val fixedParams = fixedChild.layoutParams as MarginLayoutParams
val fixedChildWidth =
fixedChild.measuredWidth + fixedParams.leftMargin + fixedParams.rightMargin
val fixedChildHeight =
fixedChild.measuredHeight + fixedParams.topMargin + fixedParams.bottomMargin
val wrapChildWidthSpec = ViewGroup.getChildMeasureSpec(
widthMeasureSpec,
paddingLeft + paddingRight + fixedChildWidth, wrapChild.layoutParams.width
)
val wrapChildHeightSpec = ViewGroup.getChildMeasureSpec(
heightMeasureSpec, paddingTop + paddingBottom, wrapChild.layoutParams.height
)
wrapChild.measure(wrapChildWidthSpec, wrapChildHeightSpec)
val wrapParams = wrapChild.layoutParams as MarginLayoutParams
val wrapChildWidth =
wrapChild.measuredWidth + wrapParams.leftMargin + wrapParams.rightMargin
val wrapChildHeight =
wrapChild.measuredHeight + wrapParams.topMargin + wrapParams.bottomMargin
val width = wrapChildWidth + fixedChildWidth
val height = fixedChildHeight.coerceAtLeast(wrapChildHeight)
start0 = paddingLeft + wrapParams.leftMargin
start1 = paddingLeft + wrapChildWidth + fixedParams.leftMargin
setMeasuredDimension(
if (widthMode == MeasureSpec.EXACTLY) widthSize else width + paddingLeft + paddingRight,
if (heightMode == MeasureSpec.EXACTLY) heightSize else height + paddingTop + paddingBottom
)
}
private var start0 = 0
private var start1 = 0
override fun onLayout(changed: Boolean, l: Int, t: Int, r: Int, b: Int) {
val wrapChild = getChildAt(0)
val fixedChild = getChildAt(1)
val y0 = (measuredHeight - wrapChild.measuredHeight) / 2
val y1 = (measuredHeight - fixedChild.measuredHeight) / 2
wrapChild.layout(
start0,
y0,
start0 + wrapChild.measuredWidth,
y0 + wrapChild.measuredHeight
)
fixedChild.layout(
start1,
y1,
start1 + fixedChild.measuredWidth,
y1 + fixedChild.measuredHeight
)
}
}
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