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package net.lacolaco.smileessence.view.adapter
import android.app.Fragment
import android.app.FragmentManager
import android.app.FragmentTransaction
import android.os.Bundle
import android.support.v4.view.PagerAdapter
import android.view.View
import android.view.ViewGroup
import net.lacolaco.smileessence.BuildConfig
import net.lacolaco.smileessence.activity.MainActivity
import net.lacolaco.smileessence.logging.Logger
import net.lacolaco.smileessence.view.page.PageFragment
import java.lang.ref.WeakReference
import java.util.*
class PageListAdapter(_activity: MainActivity) : PagerAdapter() {
private val mFragmentManager: FragmentManager = _activity.fragmentManager
private var mCurTransaction: FragmentTransaction? = null
private var mCurrentPrimaryItem: Fragment? = null
private val pages = ArrayList<PageInfo>()
private val fragmentCache = HashMap<Int, WeakReference<PageFragment>>()
@Synchronized
fun getItem(position: Int): PageFragment {
val pf: PageFragment
val info = pages[position]
try {
pf = info.fragmentClass.newInstance()
} catch (e: Exception) {
Logger.error("should not happen: fragmentClass is private or Android is broken?")
e.printStackTrace()
throw RuntimeException(e)
}
pf.arguments = info.args
fragmentCache.put(position, WeakReference(pf))
return pf
}
@Synchronized
fun getCachedFragment(pos: Int): PageFragment? {
val wpf = fragmentCache[pos]
return wpf?.get()
}
@Synchronized override fun getCount(): Int {
return pages.size
}
fun addPage(klass: Class<out PageFragment>, name: String, args: Bundle, notifyChanged: Boolean) {
pages.add(PageInfo(klass, name, args))
if (notifyChanged) notifyDataSetChanged()
}
fun getName(pos: Int): String {
return pages[pos].name
}
@Deprecated("")
fun getIndex(fragmentClass: Class<out PageFragment>): Int {
for (i in pages.indices) {
if (pages[i].fragmentClass == fragmentClass) {
return i
}
}
return -1
}
private class PageInfo internal constructor(val fragmentClass: Class<out PageFragment>, val name: String, val args: Bundle)
override fun startUpdate(container: ViewGroup) {
assert(container.id != View.NO_ID)
}
override fun instantiateItem(container: ViewGroup, position: Int): Any {
if (mCurTransaction == null) {
mCurTransaction = mFragmentManager.beginTransaction()
}
val itemId = position.toLong()
// Do we already have this fragment?
val name = "android:switcher:${container.id}:$itemId"
var fragment: Fragment? = mFragmentManager.findFragmentByTag(name)
if (fragment != null) {
if (BuildConfig.DEBUG)
Logger.verbose("Attaching item #$itemId: f=$fragment")
mCurTransaction!!.attach(fragment)
} else {
fragment = getItem(position)
if (BuildConfig.DEBUG)
Logger.verbose("Adding item #$itemId: f=$fragment")
mCurTransaction!!.add(container.id, fragment, "android:switcher:${container.id}:$itemId")
}
if (fragment !== mCurrentPrimaryItem) {
fragment.setMenuVisibility(false)
fragment.userVisibleHint = false
}
return fragment
}
override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
if (mCurTransaction == null) {
mCurTransaction = mFragmentManager.beginTransaction()
}
if (BuildConfig.DEBUG)
Logger.verbose("Detaching item #" + position + ": f=" + `object`
+ " v=" + (`object` as Fragment).view)
mCurTransaction!!.detach(`object` as Fragment)
}
override fun setPrimaryItem(container: ViewGroup, position: Int, `object`: Any) {
val fragment = `object` as Fragment?
if (fragment !== mCurrentPrimaryItem) {
if (mCurrentPrimaryItem != null) {
mCurrentPrimaryItem!!.setMenuVisibility(false)
mCurrentPrimaryItem!!.userVisibleHint = false
}
if (fragment != null) {
fragment.setMenuVisibility(true)
fragment.userVisibleHint = true
}
mCurrentPrimaryItem = fragment
}
}
override fun finishUpdate(container: ViewGroup) {
if (mCurTransaction != null) {
mCurTransaction!!.commitAllowingStateLoss()
mCurTransaction = null
mFragmentManager.executePendingTransactions()
}
}
override fun isViewFromObject(view: View, `object`: Any): Boolean {
return (`object` as Fragment).view === view
}
}
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