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Use custom logic for fragment back stack
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app/src/main/java/org/jellyfin/androidtv/ui/browsing/DestinationFragmentView.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| package org.jellyfin.androidtv.ui.browsing | ||
|
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||
| import android.annotation.SuppressLint | ||
| import android.content.Context | ||
| import android.os.Bundle | ||
| import android.os.Parcel | ||
| import android.os.Parcelable | ||
| import android.util.AttributeSet | ||
| import android.widget.FrameLayout | ||
| import androidx.core.os.BundleCompat | ||
| import androidx.core.os.ParcelCompat | ||
| import androidx.core.os.bundleOf | ||
| import androidx.fragment.app.Fragment | ||
| import androidx.fragment.app.FragmentContainerView | ||
| import androidx.fragment.app.FragmentManager | ||
| import androidx.fragment.app.FragmentTransaction | ||
| import org.jellyfin.androidtv.R | ||
| import org.jellyfin.androidtv.ui.navigation.NavigationAction | ||
| import java.util.Stack | ||
|
|
||
| private class HistoryEntry( | ||
| val name: Class<out Fragment>, | ||
| val arguments: Bundle = bundleOf(), | ||
|
|
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| var fragment: Fragment? = null, | ||
| var savedState: Fragment.SavedState? = null, | ||
| ) : Parcelable { | ||
| override fun describeContents(): Int = 0 | ||
|
|
||
| override fun writeToParcel(dest: Parcel, flags: Int) { | ||
| dest.writeString(name.name) | ||
| dest.writeBundle(arguments) | ||
| dest.writeParcelable(savedState, 0) | ||
| } | ||
|
|
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| companion object CREATOR : Parcelable.Creator<HistoryEntry> { | ||
| @Suppress("UNCHECKED_CAST") | ||
| override fun createFromParcel(parcel: Parcel): HistoryEntry = HistoryEntry( | ||
| name = Class.forName(parcel.readString()!!) as Class<out Fragment>, | ||
| arguments = parcel.readBundle(this::class.java.classLoader)!!, | ||
| fragment = null, | ||
| savedState = ParcelCompat.readParcelable(parcel, this::class.java.classLoader, Fragment.SavedState::class.java)!!, | ||
| ) | ||
|
|
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| override fun newArray(size: Int): Array<HistoryEntry?> = arrayOfNulls(size) | ||
| } | ||
| } | ||
|
|
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| class DestinationFragmentView @JvmOverloads constructor( | ||
| context: Context, | ||
| attrs: AttributeSet? = null, | ||
| ) : FrameLayout(context, attrs) { | ||
| private companion object { | ||
| private const val FRAGMENT_TAG_CONTENT = "content" | ||
| private const val BUNDLE_SUPER = "super" | ||
| private const val BUNDLE_HISTORY = "history" | ||
| } | ||
|
|
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| private val fragmentManager by lazy { | ||
| FragmentManager.findFragmentManager(this) | ||
| } | ||
|
|
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| private val container by lazy { | ||
| FragmentContainerView(context).also { view -> | ||
| view.id = R.id.container | ||
| addView(view) | ||
| } | ||
| } | ||
|
|
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| private val history = Stack<HistoryEntry>() | ||
|
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| fun navigate(action: NavigationAction.NavigateFragment) { | ||
| val entry = HistoryEntry(action.destination.fragment.java, action.destination.arguments) | ||
|
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| // Create the base transaction so we can mutate everything at once | ||
| val transaction = fragmentManager.beginTransaction() | ||
|
|
||
| if (action.clear) { | ||
| // Clear all current fragments from the history before adding the new entry | ||
| history.mapNotNull { it.fragment }.forEach { transaction.remove(it) } | ||
| history.clear() | ||
| history.push(entry) | ||
| } else if (action.replace && action.addToBackStack && history.isNotEmpty()) { | ||
| // Remove the top-most entry before replacing it with the next | ||
| val currentFragment = history[history.size - 1].fragment | ||
| if (currentFragment != null) transaction.remove(currentFragment) | ||
| history[history.size - 1] = entry | ||
| } else { | ||
| // Add to the end of the history | ||
| saveCurrentFragmentState() | ||
| history.push(entry) | ||
| } | ||
|
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| activateHistoryEntry(entry, transaction) | ||
| } | ||
|
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| fun goBack(): Boolean { | ||
| // Require at least 2 items (current & previous) to go back | ||
| if (history.size < 2) return false | ||
|
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| // Remove current entry | ||
| history.pop() | ||
|
|
||
| // Read & set previous entry | ||
| val entry = history.last() | ||
| activateHistoryEntry(entry) | ||
|
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| return true | ||
| } | ||
|
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| private fun saveCurrentFragmentState() { | ||
| if (history.isEmpty()) return | ||
|
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| // Update the top-most history entry with state from current fragment | ||
| val fragment = requireNotNull(fragmentManager.findFragmentByTag(FRAGMENT_TAG_CONTENT)) | ||
| history[history.size - 1].savedState = fragmentManager.saveFragmentInstanceState(fragment) | ||
| } | ||
|
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| @SuppressLint("CommitTransaction") | ||
| private fun activateHistoryEntry( | ||
| entry: HistoryEntry, | ||
| transaction: FragmentTransaction = fragmentManager.beginTransaction(), | ||
| ) { | ||
| var fragment = entry.fragment | ||
|
|
||
| // Create if there is no existing fragment | ||
| if (fragment == null) { | ||
| fragment = fragmentManager.fragmentFactory.instantiate(context.classLoader, entry.name.name).apply { | ||
| setInitialSavedState(entry.savedState) | ||
| } | ||
| entry.fragment = fragment | ||
| } | ||
|
|
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| // Update arguments | ||
| fragment.arguments = entry.arguments | ||
|
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| transaction.apply { | ||
| // Set options | ||
| setReorderingAllowed(true) | ||
| setCustomAnimations(R.anim.fade_in, R.anim.fade_out, R.anim.fade_in, R.anim.fade_out) | ||
|
|
||
| // Detach current fragment | ||
| fragmentManager.findFragmentByTag(FRAGMENT_TAG_CONTENT)?.let(::detach) | ||
|
|
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| // Attach or add next fragment | ||
| if (fragment.isDetached) attach(fragment) | ||
| else add(container.id, fragment, FRAGMENT_TAG_CONTENT) | ||
| } | ||
|
|
||
| // Commit | ||
| if (fragmentManager.isStateSaved) transaction.commitNowAllowingStateLoss() | ||
| else transaction.commitNow() | ||
| } | ||
|
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| override fun onSaveInstanceState(): Parcelable { | ||
| // Always retrieve current state before writing | ||
| saveCurrentFragmentState() | ||
|
|
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| // Save state | ||
| return bundleOf( | ||
| BUNDLE_SUPER to super.onSaveInstanceState(), | ||
| BUNDLE_HISTORY to history.toTypedArray() | ||
| ) | ||
| } | ||
|
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| override fun onRestoreInstanceState(state: Parcelable?) { | ||
| // Ignore if not a bundle | ||
| if (state !is Bundle) return super.onRestoreInstanceState(state) | ||
|
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| // Call parent | ||
| @Suppress("DEPRECATION") | ||
| val parent = state.getParcelable<Parcelable>(BUNDLE_SUPER) | ||
| if (parent != null) super.onRestoreInstanceState(parent) | ||
|
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| // Restore history | ||
| @Suppress("UNCHECKED_CAST") | ||
| val savedHistory = BundleCompat.getParcelableArray(state, BUNDLE_HISTORY, HistoryEntry::class.java) as Array<HistoryEntry>? | ||
| if (savedHistory != null) { | ||
| history.clear() | ||
| history.addAll(savedHistory) | ||
| if (history.isNotEmpty()) activateHistoryEntry(history.last()) | ||
| } | ||
| } | ||
| } |
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