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formatting GroupItemDecoration 

formatting GroupItemDecoration
This commit is contained in:
Stanisalv 2020-08-26 19:05:58 +03:00
parent e5c8cad4a1
commit 85092fb4ae
1 changed files with 29 additions and 21 deletions
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50
recyclerview-adapters/src/main/java/ru/touchin/roboswag/recyclerview_adapters/decorators/GroupItemDecoration.kt
View File

@ -39,12 +39,7 @@ class GroupItemDecoration<TViewHolder : GroupItemDecoration.ViewHolder>(
when {
predicate(adapterPosition) -> {
if (groupView != null) {
val layoutParams = groupView.layoutParams as ViewGroup.MarginLayoutParams
parent.getDecoratedBoundsWithMargins(child, bounds)
canvas.save()
translateCanvasByOrientation(canvas, parent, layoutParams)
groupView.draw(canvas)
canvas.restore()
onDrawGroupView(groupView, parent, child, canvas)
} else {
isInvalidated = true
break@loop
@ -76,6 +71,15 @@ class GroupItemDecoration<TViewHolder : GroupItemDecoration.ViewHolder>(
}
}
private fun onDrawGroupView(groupView: View, parent: RecyclerView, child: View, canvas: Canvas) {
val layoutParams = groupView.layoutParams as ViewGroup.MarginLayoutParams
parent.getDecoratedBoundsWithMargins(child, bounds)
canvas.save()
translateCanvasByOrientation(canvas, parent, layoutParams)
groupView.draw(canvas)
canvas.restore()
}
private fun translateCanvasByOrientation(canvas: Canvas, parent: RecyclerView, layoutParams: ViewGroup.MarginLayoutParams) {
when (orientation) {
RecyclerView.VERTICAL -> canvas.translate(parent.paddingLeft.toFloat() + layoutParams.leftMargin, bounds.top.toFloat())
@ -83,24 +87,28 @@ class GroupItemDecoration<TViewHolder : GroupItemDecoration.ViewHolder>(
}
}
private fun obtainViewHolder(adapterPosition: Int, parent: RecyclerView) = viewHoldersPool[adapterPosition]
private fun obtainViewHolder(adapterPosition: Int, parent: RecyclerView): TViewHolder = viewHoldersPool[adapterPosition]
?: onCreateViewHolder(parent).also { viewHoldersPool[adapterPosition] = it }
private fun getHeightChildMeasureSpec(parent: RecyclerView, layoutParams: ViewGroup.MarginLayoutParams, groupView: View): Int {
return ViewGroup.getChildMeasureSpec(
View.MeasureSpec.makeMeasureSpec(parent.measuredHeight, View.MeasureSpec.EXACTLY),
parent.paddingTop + parent.paddingBottom + layoutParams.topMargin + layoutParams.bottomMargin,
groupView.layoutParams.height
)
}
private fun getHeightChildMeasureSpec(
parent: RecyclerView,
layoutParams: ViewGroup.MarginLayoutParams,
groupView: View
): Int = ViewGroup.getChildMeasureSpec(
View.MeasureSpec.makeMeasureSpec(parent.measuredHeight, View.MeasureSpec.EXACTLY),
parent.paddingTop + parent.paddingBottom + layoutParams.topMargin + layoutParams.bottomMargin,
groupView.layoutParams.height
)
private fun getWidthChildMeasureSpec(parent: RecyclerView, layoutParams: ViewGroup.MarginLayoutParams, groupView: View): Int {
return ViewGroup.getChildMeasureSpec(
View.MeasureSpec.makeMeasureSpec(parent.measuredWidth, View.MeasureSpec.EXACTLY),
parent.paddingLeft + parent.paddingRight + layoutParams.leftMargin + layoutParams.rightMargin,
groupView.layoutParams.width
)
}
private fun getWidthChildMeasureSpec(
parent: RecyclerView,
layoutParams: ViewGroup.MarginLayoutParams,
groupView: View
): Int = ViewGroup.getChildMeasureSpec(
View.MeasureSpec.makeMeasureSpec(parent.measuredWidth, View.MeasureSpec.EXACTLY),
parent.paddingLeft + parent.paddingRight + layoutParams.leftMargin + layoutParams.rightMargin,
groupView.layoutParams.width
)
open class ViewHolder(val view: View) {
fun <T : View> findViewById(@IdRes resId: Int): T = view.findViewById(resId)