forked from fekt/hush-android-wallet
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95 lines
3.3 KiB
95 lines
3.3 KiB
package cash.z.ecc.android.ui.base
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import android.os.Bundle
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import android.view.LayoutInflater
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import android.view.View
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import android.view.ViewGroup
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import androidx.annotation.NonNull
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import androidx.fragment.app.Fragment
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import androidx.lifecycle.lifecycleScope
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import androidx.viewbinding.ViewBinding
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import cash.z.ecc.android.feedback.Report
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import cash.z.ecc.android.ui.MainActivity
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.Job
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import kotlinx.coroutines.SupervisorJob
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import kotlinx.coroutines.cancel
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import kotlinx.coroutines.flow.filter
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import kotlinx.coroutines.flow.first
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import kotlinx.coroutines.flow.onEach
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import kotlinx.coroutines.launch
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abstract class BaseFragment<T : ViewBinding> : Fragment() {
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// Normally will be of type MainActivity, but will be null when run under automated tests.
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// A future enhancement would be to move analytics. For example, refactor it out of the Activity
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// so that we don't have to cast. Or at least put analytics into an interface, so that we're more
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// explicitly casting to Analytics rather than MainActivity.
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val mainActivity: MainActivity? get() = if (activity is MainActivity) {
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activity as MainActivity
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} else {
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null
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}
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lateinit var binding: T
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lateinit var resumedScope: CoroutineScope
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open val screen: Report.Screen? = null
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override fun onCreateView(
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inflater: LayoutInflater,
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container: ViewGroup?,
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savedInstanceState: Bundle?
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): View? {
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binding = inflate(inflater)
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return binding.root
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}
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override fun onResume() {
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super.onResume()
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mainActivity?.reportScreen(screen)
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resumedScope = lifecycleScope.coroutineContext.let {
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CoroutineScope(Dispatchers.Main + SupervisorJob(it[Job]))
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}
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}
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override fun onPause() {
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super.onPause()
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resumedScope.cancel()
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}
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// inflate is static in the ViewBinding class so we can't handle this ourselves
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// each fragment must call FragmentMyLayoutBinding.inflate(inflater)
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abstract fun inflate(@NonNull inflater: LayoutInflater): T
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fun onBackPressNavTo(navResId: Int, block: (() -> Unit) = {}) {
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mainActivity?.onFragmentBackPressed(this) {
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block()
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mainActivity?.safeNavigate(navResId)
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}
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}
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fun tapped(tap: Report.Tap) {
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mainActivity?.reportTap(tap)
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}
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/**
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* Launch the given block once, within the 'resumedScope', once the Synchronizer is ready. This
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* utility function helps solve the problem of taking action with the synchronizer before it
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* is created. This surfaced while loading keys from secure storage: the HomeFragment would
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* resume and start monitoring the synchronizer for changes BEFORE the onAttach function
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* returned, meaning before the synchronizerComponent is created. So a state variable needed to
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* exist with a longer lifecycle than the synchronizer. This function just takes care of all the
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* boilerplate of monitoring that state variable until it returns true.
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*/
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fun launchWhenSyncReady(block: () -> Unit) {
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resumedScope.launch {
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mainActivity?.let {
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it.mainViewModel.syncReady.filter { isReady -> isReady }.onEach {
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block()
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}.first()
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}
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}
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}
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}
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