Yuito-app-android/app/src/main/java/com/keylesspalace/tusky/pager/MainPagerAdapter.kt

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/* Copyright 2017 Andrew Dawson
*
* This file is a part of Tusky.
*
* This program is free software; you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along with Tusky; if not,
* see <http://www.gnu.org/licenses>. */
package com.keylesspalace.tusky.pager
import android.util.SparseArray
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentManager
import androidx.fragment.app.FragmentPagerAdapter
import androidx.viewpager.widget.PagerAdapter
import com.keylesspalace.tusky.TabData
class MainPagerAdapter(val tabs: List<TabData>, manager: FragmentManager) : FragmentPagerAdapter(manager) {
private val fragments = SparseArray<Fragment>(tabs.size)
override fun getItem(position: Int): Fragment {
val tab = tabs[position]
return tab.fragment(tab.arguments)
}
override fun getCount(): Int {
return tabs.size
}
override fun getPageTitle(position: Int): CharSequence? {
return null
}
override fun getItemId(position: Int): Long {
return tabs[position].hashCode() + position.toLong()
}
override fun getItemPosition(item: Any): Int {
return PagerAdapter.POSITION_NONE
}
override fun instantiateItem(container: ViewGroup, position: Int): Any {
val fragment = super.instantiateItem(container, position)
if (fragment is Fragment)
fragments.put(position, fragment)
return fragment
}
override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
super.destroyItem(container, position, `object`)
fragments.remove(position)
}
fun getFragment(position: Int): Fragment? = fragments[position]
}