Signal-Android/app/src/main/java/org/thoughtcrime/securesms/DeviceAddFragment.java

package org.thoughtcrime.securesms;

import android.animation.Animator;
import android.annotation.TargetApi;
import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewAnimationUtils;
import android.view.ViewGroup;
import android.view.animation.DecelerateInterpolator;
import android.widget.ImageView;
import android.widget.LinearLayout;

import androidx.annotation.NonNull;

import org.signal.qr.QrScannerView;
import org.signal.qr.kitkat.ScanListener;
import org.thoughtcrime.securesms.util.LifecycleDisposable;
import org.thoughtcrime.securesms.util.ViewUtil;

public class DeviceAddFragment extends LoggingFragment {

  private final LifecycleDisposable lifecycleDisposable = new LifecycleDisposable();

  private LinearLayout  overlay;
  private ImageView     devicesImage;
  private ScanListener  scanListener;

  @Override
  public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup viewGroup, Bundle bundle) {
    ViewGroup container = ViewUtil.inflate(inflater, viewGroup, R.layout.device_add_fragment);
    this.overlay      = container.findViewById(R.id.overlay);
    QrScannerView scannerView = container.findViewById(R.id.scanner);
    this.devicesImage = container.findViewById(R.id.devices);

    if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
      this.overlay.setOrientation(LinearLayout.HORIZONTAL);
    } else {
      this.overlay.setOrientation(LinearLayout.VERTICAL);
    }

    if (Build.VERSION.SDK_INT >= 21) {
      container.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {
        @TargetApi(21)
        @Override
        public void onLayoutChange(View v, int left, int top, int right, int bottom,
                                   int oldLeft, int oldTop, int oldRight, int oldBottom)
        {
          v.removeOnLayoutChangeListener(this);

          Animator reveal = ViewAnimationUtils.createCircularReveal(v, right, bottom, 0, (int) Math.hypot(right, bottom));
          reveal.setInterpolator(new DecelerateInterpolator(2f));
          reveal.setDuration(800);
          reveal.start();
        }
      });
    }

    scannerView.start(getViewLifecycleOwner());

    lifecycleDisposable.bindTo(getViewLifecycleOwner());
    lifecycleDisposable.add(scannerView.getQrData().subscribe(qrData -> {
      if (scanListener != null) {
        scanListener.onQrDataFound(qrData);
      }
    }));

    return container;
  }

  @Override
  public void onConfigurationChanged(@NonNull Configuration newConfiguration) {
    super.onConfigurationChanged(newConfiguration);

    if (newConfiguration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
      overlay.setOrientation(LinearLayout.HORIZONTAL);
    } else {
      overlay.setOrientation(LinearLayout.VERTICAL);
    }
  }

  public ImageView getDevicesImage() {
    return devicesImage;
  }

  public void setScanListener(ScanListener scanListener) {
    this.scanListener = scanListener;
  }
}