80 lines
3.0 KiB
Kotlin
80 lines
3.0 KiB
Kotlin
/*
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* Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package com.wireguard.android.activity
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import android.os.Bundle
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import androidx.databinding.CallbackRegistry
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import androidx.databinding.CallbackRegistry.NotifierCallback
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import androidx.lifecycle.lifecycleScope
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import com.wireguard.android.Application
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import com.wireguard.android.model.ObservableTunnel
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/**
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* Base class for activities that need to remember the currently-selected tunnel.
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*/
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abstract class BaseActivity : ThemeChangeAwareActivity() {
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private val selectionChangeRegistry = SelectionChangeRegistry()
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var selectedTunnel: ObservableTunnel? = null
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set(value) {
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val oldTunnel = field
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if (oldTunnel == value) return
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field = value
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onSelectedTunnelChanged(oldTunnel, value)
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selectionChangeRegistry.notifyCallbacks(oldTunnel, 0, value)
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}
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fun addOnSelectedTunnelChangedListener(listener: OnSelectedTunnelChangedListener) {
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selectionChangeRegistry.add(listener)
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}
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override fun onCreate(savedInstanceState: Bundle?) {
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// Restore the saved tunnel if there is one; otherwise grab it from the arguments.
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val savedTunnelName = when {
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savedInstanceState != null -> savedInstanceState.getString(KEY_SELECTED_TUNNEL)
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intent != null -> intent.getStringExtra(KEY_SELECTED_TUNNEL)
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else -> null
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}
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if (savedTunnelName != null)
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lifecycleScope.launchWhenCreated { selectedTunnel = Application.getTunnelManager().getTunnels()[savedTunnelName] }
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// The selected tunnel must be set before the superclass method recreates fragments.
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super.onCreate(savedInstanceState)
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}
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override fun onSaveInstanceState(outState: Bundle) {
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if (selectedTunnel != null) outState.putString(KEY_SELECTED_TUNNEL, selectedTunnel!!.name)
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super.onSaveInstanceState(outState)
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}
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protected abstract fun onSelectedTunnelChanged(oldTunnel: ObservableTunnel?, newTunnel: ObservableTunnel?)
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fun removeOnSelectedTunnelChangedListener(
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listener: OnSelectedTunnelChangedListener) {
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selectionChangeRegistry.remove(listener)
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}
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interface OnSelectedTunnelChangedListener {
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fun onSelectedTunnelChanged(oldTunnel: ObservableTunnel?, newTunnel: ObservableTunnel?)
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}
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private class SelectionChangeNotifier : NotifierCallback<OnSelectedTunnelChangedListener, ObservableTunnel, ObservableTunnel>() {
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override fun onNotifyCallback(
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listener: OnSelectedTunnelChangedListener,
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oldTunnel: ObservableTunnel?,
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ignored: Int,
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newTunnel: ObservableTunnel?
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) {
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listener.onSelectedTunnelChanged(oldTunnel, newTunnel)
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}
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}
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private class SelectionChangeRegistry :
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CallbackRegistry<OnSelectedTunnelChangedListener, ObservableTunnel, ObservableTunnel>(SelectionChangeNotifier())
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companion object {
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private const val KEY_SELECTED_TUNNEL = "selected_tunnel"
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}
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}
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