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refactor(bank-sdk): Convert the digital invoice's
HelpActivity into…
… a fragment Needs to be added to the Bank SDK's navigation graph. BSDK-258
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45 changes: 45 additions & 0 deletions
45
bank-sdk/sdk/src/main/java/net/gini/android/bank/sdk/util/AutoClearedValue.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| package net.gini.android.bank.sdk.util | ||
|
|
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| import androidx.fragment.app.Fragment | ||
| import androidx.lifecycle.DefaultLifecycleObserver | ||
| import androidx.lifecycle.LifecycleOwner | ||
| import kotlin.properties.ReadWriteProperty | ||
| import kotlin.reflect.KProperty | ||
|
|
||
| /** | ||
| * A lazy property that gets cleaned up when the fragment's view is destroyed. | ||
| * | ||
| * Accessing this variable while the fragment's view is destroyed will throw NPE. | ||
| */ | ||
| internal class AutoClearedValue<T : Any>(val fragment: Fragment) : ReadWriteProperty<Fragment, T> { | ||
| private var _value: T? = null | ||
|
|
||
| init { | ||
| fragment.lifecycle.addObserver(object: DefaultLifecycleObserver { | ||
| override fun onCreate(owner: LifecycleOwner) { | ||
| fragment.viewLifecycleOwnerLiveData.observe(fragment) { viewLifecycleOwner -> | ||
| viewLifecycleOwner?.lifecycle?.addObserver(object: DefaultLifecycleObserver { | ||
| override fun onDestroy(owner: LifecycleOwner) { | ||
| _value = null | ||
| } | ||
| }) | ||
| } | ||
| } | ||
| }) | ||
| } | ||
|
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| override fun getValue(thisRef: Fragment, property: KProperty<*>): T { | ||
| return _value ?: throw IllegalStateException( | ||
| "should never call auto-cleared-value get when it might not be available" | ||
| ) | ||
| } | ||
|
|
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| override fun setValue(thisRef: Fragment, property: KProperty<*>, value: T) { | ||
| _value = value | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Creates an [AutoClearedValue] associated with this fragment. | ||
| */ | ||
| internal fun <T : Any> Fragment.autoCleared() = AutoClearedValue<T>(this) |
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