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package net.lacolaco.smileessence.view
import android.app.Fragment
import android.app.FragmentManager
import android.os.Bundle
import androidx.legacy.app.FragmentPagerAdapter
import androidx.viewpager.widget.ViewPager
import android.view.ViewGroup
import net.lacolaco.smileessence.World
import net.lacolaco.smileessence.data.PageInfo
import net.lacolaco.smileessence.view.page.PageFragment
import java.util.*
class MainFragmentPagerAdapter(private val world: World, private val viewPager: ViewPager, fm: FragmentManager) :
FragmentPagerAdapter(fm) {
private val pages = Collections.unmodifiableList(world.pages.map { Page(it) })
@Suppress("UNCHECKED_CAST")
fun getPageFragmentAt(position: Int): PageFragment<*> =
pages[position].fragment ?: instantiateItem(viewPager, position) as PageFragment<*>
override fun getItem(position: Int): Fragment {
val args = Bundle()
args.putLong(PageFragment.KEY_WORLD_USER_ID, world.id)
args.putInt(PageFragment.KEY_PAGE_POSITION, position)
val info = pages[position]
assert(info.fragment == null)
return info.pageInfo.fragmentClass.newInstance().apply { arguments = args }
}
override fun getCount(): Int {
return pages.size
}
override fun instantiateItem(container: ViewGroup, position: Int): Any {
val info = pages[position]
val fragment = super.instantiateItem(container, position)
info.fragment = fragment as PageFragment<*>
return fragment
}
override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
throw IllegalStateException("Fragments must not be destroyed by ViewPager")
}
private class Page(var pageInfo: PageInfo, var fragment: PageFragment<*>? = null)
}
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