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/*
* Copyright © 2017-2023 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.activity
import android.content.Intent
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.view.View
import androidx.activity.OnBackPressedCallback
import androidx.activity.addCallback
import androidx.appcompat.app.ActionBar
import androidx.fragment.app.FragmentManager
import androidx.fragment.app.FragmentTransaction
import androidx.fragment.app.commit
import com.wireguard.android.R
import com.wireguard.android.fragment.TunnelDetailFragment
import com.wireguard.android.fragment.TunnelEditorFragment
import com.wireguard.android.model.ObservableTunnel
/**
* CRUD interface for WireGuard tunnels. This activity serves as the main entry point to the
* WireGuard application, and contains several fragments for listing, viewing details of, and
* editing the configuration and interface state of WireGuard tunnels.
*/
class MainActivity : BaseActivity(), FragmentManager.OnBackStackChangedListener {
private var actionBar: ActionBar? = null
private var isTwoPaneLayout = false
private var backPressedCallback: OnBackPressedCallback? = null
private fun handleBackPressed() {
val backStackEntries = supportFragmentManager.backStackEntryCount
// If the two-pane layout does not have an editor open, going back should exit the app.
if (isTwoPaneLayout && backStackEntries <= 1) {
finish()
return
}
if (backStackEntries >= 1)
supportFragmentManager.popBackStack()
// Deselect the current tunnel on navigating back from the detail pane to the one-pane list.
if (backStackEntries == 1)
selectedTunnel = null
}
override fun onBackStackChanged() {
val backStackEntries = supportFragmentManager.backStackEntryCount
backPressedCallback?.isEnabled = backStackEntries >= 1
if (actionBar == null) return
// Do not show the home menu when the two-pane layout is at the detail view (see above).
val minBackStackEntries = if (isTwoPaneLayout) 2 else 1
actionBar!!.setDisplayHomeAsUpEnabled(backStackEntries >= minBackStackEntries)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.main_activity)
actionBar = supportActionBar
isTwoPaneLayout = findViewById<View?>(R.id.master_detail_wrapper) != null
supportFragmentManager.addOnBackStackChangedListener(this)
backPressedCallback = onBackPressedDispatcher.addCallback(this) { handleBackPressed() }
onBackStackChanged()
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.main_activity, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
return when (item.itemId) {
android.R.id.home -> {
// The back arrow in the action bar should act the same as the back button.
onBackPressedDispatcher.onBackPressed()
true
}
R.id.menu_action_edit -> {
supportFragmentManager.commit {
replace(R.id.detail_container, TunnelEditorFragment())
setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
addToBackStack(null)
}
true
}
// This menu item is handled by the editor fragment.
R.id.menu_action_save -> false
R.id.menu_settings -> {
startActivity(Intent(this, SettingsActivity::class.java))
true
}
else -> super.onOptionsItemSelected(item)
}
}
override fun onSelectedTunnelChanged(
oldTunnel: ObservableTunnel?,
newTunnel: ObservableTunnel?
): Boolean {
val fragmentManager = supportFragmentManager
if (fragmentManager.isStateSaved) {
return false
}
val backStackEntries = fragmentManager.backStackEntryCount
if (newTunnel == null) {
// Clear everything off the back stack (all editors and detail fragments).
fragmentManager.popBackStackImmediate(0, FragmentManager.POP_BACK_STACK_INCLUSIVE)
return true
}
if (backStackEntries == 2) {
// Pop the editor off the back stack to reveal the detail fragment. Use the immediate
// method to avoid the editor picking up the new tunnel while it is still visible.
fragmentManager.popBackStackImmediate()
} else if (backStackEntries == 0) {
// Create and show a new detail fragment.
fragmentManager.commit {
add(R.id.detail_container, TunnelDetailFragment())
setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
addToBackStack(null)
}
}
return true
}
}
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