1 files changed, 96 insertions, 0 deletions
diff --git a/app/src/main/java/se/leap/bitmaskclient/providersetup/fragments/BaseSetupFragment.java b/app/src/main/java/se/leap/bitmaskclient/providersetup/fragments/BaseSetupFragment.java
new file mode 100644
index 00000000..151361ba
--- /dev/null
+++ b/app/src/main/java/se/leap/bitmaskclient/providersetup/fragments/BaseSetupFragment.java
@@ -0,0 +1,96 @@
+package se.leap.bitmaskclient.providersetup.fragments;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.View;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.viewpager2.widget.ViewPager2;
+
+import se.leap.bitmaskclient.providersetup.activities.SetupActivityCallback;
+
+public class BaseSetupFragment extends Fragment {
+
+    public static String EXTRA_POSITION = "EXTRA_POSITION";
+    private boolean callFragmentSelected = false;
+    SetupActivityCallback setupActivityCallback;
+
+    private final ViewPager2.OnPageChangeCallback viewPagerCallback = new ViewPager2.OnPageChangeCallback() {
+        @Override
+        public void onPageSelected(int position) {
+            super.onPageSelected(position);
+            if (position == BaseSetupFragment.this.position) {
+                handleCallFragmentSelected();
+            } else {
+                callFragmentSelected = false;
+            }
+        }
+    };
+    private int position;
+
+    public static Bundle initBundle(int pos) {
+        Bundle bundle = new Bundle();
+        bundle.putInt(EXTRA_POSITION, pos);
+        return bundle;
+    }
+
+    public BaseSetupFragment() {
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        this.position = getArguments().getInt(EXTRA_POSITION);
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (getActivity() instanceof SetupActivityCallback) {
+            setupActivityCallback = (SetupActivityCallback) getActivity();
+        } else {
+            throw new IllegalStateException("These setup fragments are closely coupled to SetupActivityCallback interface. Activities instantiating them are required to implement the interface");
+        }
+    }
+
+    @Override
+    public void onSaveInstanceState(@NonNull Bundle outState) {
+        outState.putInt(EXTRA_POSITION, position);
+        super.onSaveInstanceState(outState);
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+        setupActivityCallback.registerOnPageChangeCallback(viewPagerCallback);
+        if (setupActivityCallback.getCurrentPosition() == position) {
+            handleCallFragmentSelected();
+        }
+    }
+
+    private void handleCallFragmentSelected() {
+        if (!callFragmentSelected) {
+            callFragmentSelected = true;
+            onFragmentSelected();
+        }
+    }
+
+    @Override
+    public void onDestroyView() {
+        setupActivityCallback.removeOnPageChangeCallback(viewPagerCallback);
+        callFragmentSelected = false;
+        super.onDestroyView();
+    }
+
+    @Override
+    public void onDetach() {
+        setupActivityCallback = null;
+        super.onDetach();
+    }
+
+    public void onFragmentSelected() {
+
+    }
+}