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TabBarController.kt
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TabBarController.kt
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import java.util.ArrayList
import java.util.Stack
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentManager
import androidx.fragment.app.FragmentTransaction
import com.octopepper.yummypets.common.adapter.YPWeakReference
interface TabBarViewListener {
fun tabBarViewDidTapTab(tabIndex: Int)
}
class TabBarController(fragments: List<Fragment>,
private val fragmentManager: FragmentManager,
private val mContainerId: Int) : TabBarViewListener {
interface Delegate {
fun tabBarControllerShouldShowTabAtIndex(tabIndex: Int): Boolean
fun tabBarControllerDidGoBackToTabAtIndex(tabIndex: Int)
fun tabBarControllerDidShowFragment(fragment: Fragment)
fun tabBarClickRootFragmentAgain()
}
object UniqueTagGenerator {
var counter: Int = 0
fun generateUniqueTag(fragment: Fragment): String {
counter++
return fragment.javaClass.name + counter
}
}
class TabHistory : Stack<Int>() {
// We only want a single tab instance in the history
// at any given time so here we make sure to remove
// any existing one before pushing.
override fun push(item: Int?): Int {
remove(item)
return super.push(item)
}
}
var delegate: Delegate? = null
private val tabHistory = TabHistory()
private val fragmentStacks: MutableList<Stack<Fragment>>
private var currentStackIndex: Int = 0
fun isShowingARootFragment() : Boolean {
return fragmentStacks[currentStackIndex].size == 1
}
init {
UniqueTagGenerator.counter = 0
val numberOfTabs = fragments.count()
fragmentStacks = ArrayList(numberOfTabs)
for (i in 0 until numberOfTabs) {
val stack = Stack<Fragment>()
val fragment = fragments[i]
stack.add(fragment)
fragmentStacks.add(stack)
}
// Setup fist fragment
val fragment = fragmentStacks[currentStackIndex].peek()
performTransaction { ft ->
ft.add(mContainerId, fragment, UniqueTagGenerator.generateUniqueTag(fragment))
}
}
/// Performs a back navigation
// returns false if back can't be handled locally.
fun back(): Boolean {
val isRootFragment = fragmentStacks[currentStackIndex].size == 1
if (!isRootFragment) {
popFragment()
return true
} else if (tabHistory.size > 1) {
tabHistory.pop()
switchTab(tabHistory.peek())
delegate?.tabBarControlleDidGoBackToTabAtIndex(tabHistory.peek())
return true
}
return false
}
fun switchTab(index: Int) {
// Make sure the tab index is within range
if (index >= fragmentStacks.size) {
return
}
// Ask the delegate if we should respond to this selection.
delegate?.let {
if (!it.tabBarControlleShouldShowTabAtIndex(index)) {
return
}
}
if (currentStackIndex == index) {
val currentFragmentStack = fragmentStacks[currentStackIndex]
if(currentFragmentStack.size == 1){
delegate?.tabBarClickRootFragmentAgain()
}
else {
clearStack()
}
} else {
val fragmentToShow = fragmentStacks[index].peek()
performTransaction { ft ->
// Hide Current Fragment
val currentFragment = fragmentStacks[currentStackIndex].peek()
ft.hide(currentFragment)
// Show or Add next Fragment
if (fragmentToShow.tag == null) {
ft.add(mContainerId, fragmentToShow, UniqueTagGenerator.generateUniqueTag(fragmentToShow))
} else {
ft.show(fragmentToShow)
}
}
delegate?.tabBarControllerDidShowFragment(fragmentToShow)
}
tabHistory.push(index)
currentStackIndex = index
}
private fun performTransaction(block: (ft: FragmentTransaction) -> Unit) {
val ft = fragmentManager.beginTransaction()
block(ft)
ft.commit()
fragmentManager.executePendingTransactions()
}
fun pushFragment(fragment: Fragment) {
performTransaction { ft ->
// Hide Current fragment
val currentFragment = fragmentStacks[currentStackIndex].peek()
ft.hide(currentFragment)
// Add new fragment
ft.add(mContainerId, fragment, UniqueTagGenerator.generateUniqueTag(fragment))
}
/// Update Fragment stack
fragmentStacks[currentStackIndex].push(fragment)
delegate?.tabBarControllerDidShowFragment(fragment)
}
private fun popFragment() {
val currentStack = fragmentStacks[currentStackIndex]
val fragmentToPop = currentStack.pop()
val fragmentToShow = currentStack.peek()
performTransaction { ft ->
ft.remove(fragmentToPop)
ft.show(fragmentToShow)
}
delegate?.tabBarControllerDidShowFragment(fragmentToShow)
}
private fun clearStack() {
val currentFragmentStack = fragmentStacks[currentStackIndex]
val rootFragment = currentFragmentStack.first()
performTransaction { ft ->
while (currentFragmentStack.size > 1) {
val fragmentToRemove = currentFragmentStack.pop()
ft.remove(fragmentToRemove)
}
ft.show(rootFragment)
}
delegate?.tabBarControllerDidShowFragment(rootFragment)
}
fun clearHistory() {
// Clear FragmentManager
performTransaction { ft ->
for (fragment in fragmentManager.fragments) {
if (fragment != null) {
ft.remove(fragment)
}
}
}
tabHistory.clear()
}
override fun tabBarViewDidTapTab(tabIndex: Int) {
switchTab(tabIndex)
}
fun getCurrentFragment(): Fragment {
return fragmentStacks[currentStackIndex].last()
}
fun resetTabBarController(){
UniqueTagGenerator.counter = 0
clearHistory()
clearStack()
}
}