64 lines
1.8 KiB
Kotlin
64 lines
1.8 KiB
Kotlin
package jp.juggler.subwaytooter
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import android.util.SparseArray
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import android.view.View
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import android.view.ViewGroup
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import jp.juggler.subwaytooter.util.Benchmark
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import jp.juggler.util.LogCategory
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import java.util.*
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internal class ColumnPagerAdapter(private val activity : ActMain) : androidx.viewpager.widget.PagerAdapter() {
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companion object {
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val log = LogCategory("ColumnPagerAdapter")
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}
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private val appState = activity.app_state
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private val holder_list = SparseArray<ColumnViewHolder>()
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override fun getCount() : Int =appState.columnCount
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fun getColumn(idx : Int) : Column? = appState.column(idx)
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fun getColumnViewHolder(idx : Int) : ColumnViewHolder? {
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return holder_list.get(idx)
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}
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override fun getPageTitle(page_idx : Int) : CharSequence? {
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return getColumn(page_idx)?.getColumnName(false)
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}
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override fun isViewFromObject(view : View, obj : Any) : Boolean {
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return view === obj
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}
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private val viewCache = LinkedList<ColumnViewHolder>()
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override fun instantiateItem(container : ViewGroup, page_idx : Int) : Any {
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val holder : ColumnViewHolder
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if(viewCache.isNotEmpty()) {
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val b = Benchmark(log, "instantiateItem: cached")
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holder = viewCache.removeFirst()
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b.report()
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} else {
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val b = Benchmark(log, "instantiateItem: new")
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holder = ColumnViewHolder(activity,container)
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b.report()
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}
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container.addView(holder.viewRoot, 0)
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holder_list.put(page_idx, holder)
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holder.onPageCreate( appState.column(page_idx)!!, page_idx, appState.columnCount)
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return holder.viewRoot
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}
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override fun destroyItem(container : ViewGroup, page_idx : Int, obj : Any) {
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val holder = holder_list.get(page_idx)
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holder_list.remove(page_idx)
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if(holder != null) {
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holder.onPageDestroy(page_idx)
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container.removeView(holder.viewRoot)
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viewCache.addLast(holder)
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}
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}
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} |