app/src/main/java/net/ktnx/mobileledger/ui/activity/NewTransactionFragment.java

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * MoLe is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.ui.activity;
  19
  20 import android.content.Context;
  21 import android.os.Bundle;
  22 import android.renderscript.RSInvalidStateException;
  23 import android.view.LayoutInflater;
  24 import android.view.Menu;
  25 import android.view.MenuInflater;
  26 import android.view.View;
  27 import android.view.ViewGroup;
  28
  29 import androidx.annotation.NonNull;
  30 import androidx.annotation.Nullable;
  31 import androidx.fragment.app.Fragment;
  32 import androidx.fragment.app.FragmentActivity;
  33 import androidx.lifecycle.ViewModelProviders;
  34 import androidx.recyclerview.widget.ItemTouchHelper;
  35 import androidx.recyclerview.widget.LinearLayoutManager;
  36 import androidx.recyclerview.widget.RecyclerView;
  37
  38 import com.google.android.material.floatingactionbutton.FloatingActionButton;
  39 import com.google.android.material.snackbar.Snackbar;
  40
  41 import net.ktnx.mobileledger.R;
  42 import net.ktnx.mobileledger.model.Data;
  43 import net.ktnx.mobileledger.model.LedgerTransaction;
  44 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  45 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  46 import net.ktnx.mobileledger.utils.Logger;
  47 import net.ktnx.mobileledger.utils.Misc;
  48
  49 import org.jetbrains.annotations.NotNull;
  50
  51 import java.util.Date;
  52
  53 /**
  54  * A simple {@link Fragment} subclass.
  55  * Activities that contain this fragment must implement the
  56  * {@link OnNewTransactionFragmentInteractionListener} interface
  57  * to handle interaction events.
  58  */
  59 public class NewTransactionFragment extends Fragment {
  60     private NewTransactionItemsAdapter listAdapter;
  61     private NewTransactionModel viewModel;
  62     private RecyclerView list;
  63     private FloatingActionButton fab;
  64     private OnNewTransactionFragmentInteractionListener mListener;
  65     private MobileLedgerProfile mProfile;
  66     public NewTransactionFragment() {
  67         // Required empty public constructor
  68         setHasOptionsMenu(true);
  69     }
  70     @Override
  71     public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
  72         super.onCreateOptionsMenu(menu, inflater);
  73         inflater.inflate(R.menu.new_transaction_fragment, menu);
  74         menu.findItem(R.id.action_reset_new_transaction_activity)
  75             .setOnMenuItemClickListener(item -> {
  76                 listAdapter.reset();
  77                 return true;
  78             });
  79     }
  80     @Override
  81     public View onCreateView(LayoutInflater inflater, ViewGroup container,
  82                              Bundle savedInstanceState) {
  83         // Inflate the layout for this fragment
  84         return inflater.inflate(R.layout.fragment_new_transaction, container, false);
  85     }
  86
  87     @Override
  88     public void onActivityCreated(@Nullable Bundle savedInstanceState) {
  89         super.onActivityCreated(savedInstanceState);
  90         FragmentActivity activity = getActivity();
  91         if (activity == null)
  92             throw new RSInvalidStateException(
  93                     "getActivity() returned null within onActivityCreated()");
  94
  95         list = activity.findViewById(R.id.new_transaction_accounts);
  96         viewModel = ViewModelProviders.of(activity)
  97                                       .get(NewTransactionModel.class);
  98         mProfile = Data.profile.getValue();
  99         listAdapter = new NewTransactionItemsAdapter(viewModel, mProfile);
 100         list.setAdapter(listAdapter);
 101         list.setLayoutManager(new LinearLayoutManager(activity));
 102         Data.profile.observe(this, profile -> {
 103             mProfile = profile;
 104             listAdapter.setProfile(profile);
 105         });
 106         listAdapter.notifyDataSetChanged();
 107         new ItemTouchHelper(new ItemTouchHelper.Callback() {
 108             @Override
 109             public int getMovementFlags(@NonNull RecyclerView recyclerView,
 110                                         @NonNull RecyclerView.ViewHolder viewHolder) {
 111                 int flags = makeFlag(ItemTouchHelper.ACTION_STATE_IDLE, ItemTouchHelper.END);
 112                 // the top item is always there (date and description)
 113                 if (viewHolder.getAdapterPosition() > 0) {
 114                     if (viewModel.getAccountCount() > 2) {
 115                         flags |= makeFlag(ItemTouchHelper.ACTION_STATE_SWIPE,
 116                                 ItemTouchHelper.START | ItemTouchHelper.END);
 117                     }
 118                 }
 119
 120                 return flags;
 121             }
 122             @Override
 123             public boolean onMove(@NonNull RecyclerView recyclerView,
 124                                   @NonNull RecyclerView.ViewHolder viewHolder,
 125                                   @NonNull RecyclerView.ViewHolder target) {
 126                 return false;
 127             }
 128             @Override
 129             public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
 130                 if (viewModel.getAccountCount() == 2)
 131                     Snackbar.make(list, R.string.msg_at_least_two_accounts_are_required,
 132                             Snackbar.LENGTH_LONG)
 133                             .setAction("Action", null)
 134                             .show();
 135                 else {
 136                     int pos = viewHolder.getAdapterPosition();
 137                     viewModel.removeItem(pos - 1);
 138                     listAdapter.notifyItemRemoved(pos);
 139                     viewModel.sendCountNotifications(); // needed after items re-arrangement
 140                     viewModel.checkTransactionSubmittable(listAdapter);
 141                 }
 142             }
 143         }).attachToRecyclerView(list);
 144
 145         viewModel.isSubmittable()
 146                  .observe(this, isSubmittable -> {
 147                      if (isSubmittable) {
 148                          if (fab != null) {
 149                              fab.show();
 150                              fab.setEnabled(true);
 151                          }
 152                      }
 153                      else {
 154                          if (fab != null) {
 155                              fab.hide();
 156                          }
 157                      }
 158                  });
 159         viewModel.checkTransactionSubmittable(listAdapter);
 160
 161         fab = activity.findViewById(R.id.fab);
 162         fab.setOnClickListener(v -> onFabPressed());
 163
 164         boolean keep = false;
 165
 166         Bundle args = getArguments();
 167         if (args != null) {
 168             String error = args.getString("error");
 169             if (error != null) {
 170                 // TODO display error
 171                 Logger.debug("new-trans-f", String.format("Got error: %s", error));
 172                 Snackbar.make(list, error, Snackbar.LENGTH_LONG)
 173                         .show();
 174                 keep = true;
 175             }
 176         }
 177
 178         int focused = 0;
 179         if (savedInstanceState != null) {
 180             keep |= savedInstanceState.getBoolean("keep", true);
 181             focused = savedInstanceState.getInt("focused", 0);
 182         }
 183
 184         if (!keep)
 185             viewModel.reset();
 186         else {
 187             viewModel.setFocusedItem(focused);
 188         }
 189     }
 190     @Override
 191     public void onSaveInstanceState(@NonNull Bundle outState) {
 192         super.onSaveInstanceState(outState);
 193         outState.putBoolean("keep", true);
 194         final int focusedItem = viewModel.getFocusedItem();
 195         outState.putInt("focused", focusedItem);
 196     }
 197     private void onFabPressed() {
 198         fab.setEnabled(false);
 199         Misc.hideSoftKeyboard(this);
 200         if (mListener != null) {
 201             Date date = viewModel.getDate();
 202             LedgerTransaction tr =
 203                     new LedgerTransaction(null, date, viewModel.getDescription(), mProfile);
 204
 205             LedgerTransactionAccount emptyAmountAccount = null;
 206             float emptyAmountAccountBalance = 0;
 207             for (int i = 0; i < viewModel.getAccountCount(); i++) {
 208                 LedgerTransactionAccount acc = viewModel.getAccount(i);
 209                 if (acc.getAccountName()
 210                        .trim()
 211                        .isEmpty())
 212                     continue;
 213
 214                 if (acc.isAmountSet()) {
 215                     emptyAmountAccountBalance += acc.getAmount();
 216                 }
 217                 else {
 218                     emptyAmountAccount = acc;
 219                 }
 220
 221                 tr.addAccount(acc);
 222             }
 223
 224             if (emptyAmountAccount != null)
 225                 emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 226
 227             mListener.onTransactionSave(tr);
 228         }
 229     }
 230
 231     @Override
 232     public void onAttach(@NotNull Context context) {
 233         super.onAttach(context);
 234         if (context instanceof OnNewTransactionFragmentInteractionListener) {
 235             mListener = (OnNewTransactionFragmentInteractionListener) context;
 236         }
 237         else {
 238             throw new RuntimeException(
 239                     context.toString() + " must implement OnFragmentInteractionListener");
 240         }
 241     }
 242
 243     @Override
 244     public void onDetach() {
 245         super.onDetach();
 246         mListener = null;
 247     }
 248
 249     /**
 250      * This interface must be implemented by activities that contain this
 251      * fragment to allow an interaction in this fragment to be communicated
 252      * to the activity and potentially other fragments contained in that
 253      * activity.
 254      * <p>
 255      * See the Android Training lesson <a href=
 256      * "http://developer.android.com/training/basics/fragments/communicating.html"
 257      * >Communicating with Other Fragments</a> for more information.
 258      */
 259     public interface OnNewTransactionFragmentInteractionListener {
 260         void onTransactionSave(LedgerTransaction tr);
 261     }
 262 }