1 files changed, 144 insertions, 0 deletions
diff --git a/ui/src/main/java/com/wireguard/android/activity/MainActivity.java b/ui/src/main/java/com/wireguard/android/activity/MainActivity.java
new file mode 100644
index 00000000..4c33f000
--- /dev/null
+++ b/ui/src/main/java/com/wireguard/android/activity/MainActivity.java
@@ -0,0 +1,144 @@
+/*
+ * Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package com.wireguard.android.activity;
+
+import android.annotation.SuppressLint;
+import android.content.Intent;
+import android.os.Bundle;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
+import androidx.appcompat.app.ActionBar;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View.OnApplyWindowInsetsListener;
+import android.widget.LinearLayout;
+
+import com.wireguard.android.R;
+import com.wireguard.android.fragment.TunnelDetailFragment;
+import com.wireguard.android.fragment.TunnelEditorFragment;
+import com.wireguard.android.model.ObservableTunnel;
+
+import java.util.List;
+
+/**
+ * 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.
+ */
+
+public class MainActivity extends BaseActivity
+        implements FragmentManager.OnBackStackChangedListener {
+    @Nullable private ActionBar actionBar;
+    private boolean isTwoPaneLayout;
+
+    @Override
+    public void onBackPressed() {
+        final int backStackEntries = getSupportFragmentManager().getBackStackEntryCount();
+        // If the two-pane layout does not have an editor open, going back should exit the app.
+        if (isTwoPaneLayout && backStackEntries <= 1) {
+            finish();
+            return;
+        }
+        // Deselect the current tunnel on navigating back from the detail pane to the one-pane list.
+        if (!isTwoPaneLayout && backStackEntries == 1) {
+            getSupportFragmentManager().popBackStack();
+            setSelectedTunnel(null);
+            return;
+        }
+        super.onBackPressed();
+    }
+
+    @Override public void onBackStackChanged() {
+        if (actionBar == null)
+            return;
+        // Do not show the home menu when the two-pane layout is at the detail view (see above).
+        final int backStackEntries = getSupportFragmentManager().getBackStackEntryCount();
+        final int minBackStackEntries = isTwoPaneLayout ? 2 : 1;
+        actionBar.setDisplayHomeAsUpEnabled(backStackEntries >= minBackStackEntries);
+    }
+
+    // We use onTouchListener here to avoid the UI click sound, hence
+    // calling View#performClick defeats the purpose of it.
+    @SuppressLint("ClickableViewAccessibility")
+    @Override
+    protected void onCreate(@Nullable final Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.main_activity);
+        actionBar = getSupportActionBar();
+        isTwoPaneLayout = findViewById(R.id.master_detail_wrapper) instanceof LinearLayout;
+        getSupportFragmentManager().addOnBackStackChangedListener(this);
+        onBackStackChanged();
+        // Dispatch insets on back stack change
+        // This is required to ensure replaced fragments are also able to consume insets
+        findViewById(R.id.master_detail_wrapper).setOnApplyWindowInsetsListener((OnApplyWindowInsetsListener) (v, insets) -> {
+            final FragmentManager fragmentManager = getSupportFragmentManager();
+            fragmentManager.addOnBackStackChangedListener(() -> {
+                final List<Fragment> fragments = fragmentManager.getFragments();
+                for (int i = 0; i < fragments.size(); i++) {
+                    fragments.get(i).requireView().dispatchApplyWindowInsets(insets);
+                }
+            });
+            return insets;
+        });
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(final Menu menu) {
+        getMenuInflater().inflate(R.menu.main_activity, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(final MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home:
+                // The back arrow in the action bar should act the same as the back button.
+                onBackPressed();
+                return true;
+            case R.id.menu_action_edit:
+                getSupportFragmentManager().beginTransaction()
+                        .replace(R.id.detail_container, new TunnelEditorFragment())
+                        .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
+                        .addToBackStack(null)
+                        .commit();
+                return true;
+            case R.id.menu_action_save:
+                // This menu item is handled by the editor fragment.
+                return false;
+            case R.id.menu_settings:
+                startActivity(new Intent(this, SettingsActivity.class));
+                return true;
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
+    @Override
+    protected void onSelectedTunnelChanged(@Nullable final ObservableTunnel oldTunnel,
+                                           @Nullable final ObservableTunnel newTunnel) {
+        final FragmentManager fragmentManager = getSupportFragmentManager();
+        final int backStackEntries = fragmentManager.getBackStackEntryCount();
+        if (newTunnel == null) {
+            // Clear everything off the back stack (all editors and detail fragments).
+            fragmentManager.popBackStackImmediate(0, FragmentManager.POP_BACK_STACK_INCLUSIVE);
+            return;
+        }
+        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.beginTransaction()
+                    .add(R.id.detail_container, new TunnelDetailFragment())
+                    .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
+                    .addToBackStack(null)
+                    .commit();
+        }
+    }
+}