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.app.Activity;
  21 import android.content.Context;
  22 import android.os.Bundle;
  23 import android.renderscript.RSInvalidStateException;
  24 import android.view.LayoutInflater;
  25 import android.view.Menu;
  26 import android.view.MenuInflater;
  27 import android.view.View;
  28 import android.view.ViewGroup;
  29
  30 import androidx.annotation.NonNull;
  31 import androidx.annotation.Nullable;
  32 import androidx.fragment.app.Fragment;
  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
  47 import org.jetbrains.annotations.NotNull;
  48
  49 import java.util.Date;
  50
  51 /**
  52  * A simple {@link Fragment} subclass.
  53  * Activities that contain this fragment must implement the
  54  * {@link OnNewTransactionFragmentInteractionListener} interface
  55  * to handle interaction events.
  56  */
  57 public class NewTransactionFragment extends Fragment {
  58     private NewTransactionItemsAdapter listAdapter;
  59     private NewTransactionModel viewModel;
  60     private RecyclerView list;
  61     private FloatingActionButton fab;
  62     private OnNewTransactionFragmentInteractionListener mListener;
  63     private MobileLedgerProfile mProfile;
  64     public NewTransactionFragment() {
  65         // Required empty public constructor
  66         setHasOptionsMenu(true);
  67     }
  68     @Override
  69     public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
  70         super.onCreateOptionsMenu(menu, inflater);
  71         inflater.inflate(R.menu.new_transaction_fragment, menu);
  72         menu.findItem(R.id.action_reset_new_transaction_activity)
  73             .setOnMenuItemClickListener(item -> {
  74                 listAdapter.reset();
  75                 return true;
  76             });
  77     }
  78     @Override
  79     public View onCreateView(LayoutInflater inflater, ViewGroup container,
  80                              Bundle savedInstanceState) {
  81         // Inflate the layout for this fragment
  82         return inflater.inflate(R.layout.fragment_new_transaction, container, false);
  83     }
  84
  85     @Override
  86     public void onActivityCreated(@Nullable Bundle savedInstanceState) {
  87         super.onActivityCreated(savedInstanceState);
  88         Activity activity = getActivity();
  89         if (activity == null)
  90             throw new RSInvalidStateException(
  91                     "getActivity() returned null within onActivityCreated()");
  92
  93         list = activity.findViewById(R.id.new_transaction_accounts);
  94         viewModel = ViewModelProviders.of(this)
  95                                       .get(NewTransactionModel.class);
  96         mProfile = Data.profile.getValue();
  97         listAdapter = new NewTransactionItemsAdapter(viewModel, mProfile);
  98         list.setAdapter(listAdapter);
  99         list.setLayoutManager(new LinearLayoutManager(activity));
 100         Data.profile.observe(this, profile -> {
 101             mProfile = profile;
 102             listAdapter.setProfile(profile);
 103         });
 104         listAdapter.notifyDataSetChanged();
 105         new ItemTouchHelper(new ItemTouchHelper.Callback() {
 106             @Override
 107             public int getMovementFlags(@NonNull RecyclerView recyclerView,
 108                                         @NonNull RecyclerView.ViewHolder viewHolder) {
 109                 int flags = makeFlag(ItemTouchHelper.ACTION_STATE_IDLE, ItemTouchHelper.END);
 110                 // the top item is always there (date and description)
 111                 if (viewHolder.getAdapterPosition() > 0) {
 112                     if (viewModel.getAccountCount() > 2) {
 113                         flags |= makeFlag(ItemTouchHelper.ACTION_STATE_SWIPE,
 114                                 ItemTouchHelper.START | ItemTouchHelper.END);
 115                     }
 116                 }
 117
 118                 return flags;
 119             }
 120             @Override
 121             public boolean onMove(@NonNull RecyclerView recyclerView,
 122                                   @NonNull RecyclerView.ViewHolder viewHolder,
 123                                   @NonNull RecyclerView.ViewHolder target) {
 124                 return false;
 125             }
 126             @Override
 127             public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
 128                 if (viewModel.getAccountCount() == 2)
 129                     Snackbar.make(list, R.string.msg_at_least_two_accounts_are_required,
 130                             Snackbar.LENGTH_LONG)
 131                             .setAction("Action", null)
 132                             .show();
 133                 else {
 134                     int pos = viewHolder.getAdapterPosition();
 135                     viewModel.removeItem(pos - 1);
 136                     listAdapter.notifyItemRemoved(pos);
 137                     viewModel.sendCountNotifications(); // needed after items re-arrangement
 138                     viewModel.checkTransactionSubmittable(listAdapter);
 139                 }
 140             }
 141         }).attachToRecyclerView(list);
 142
 143         viewModel.isSubmittable()
 144                  .observe(this, isSubmittable -> {
 145                      if (isSubmittable) {
 146                          if (fab != null) {
 147                              fab.show();
 148                              fab.setEnabled(true);
 149                          }
 150                      }
 151                      else {
 152                          if (fab != null) {
 153                              fab.hide();
 154                          }
 155                      }
 156                  });
 157         viewModel.checkTransactionSubmittable(listAdapter);
 158
 159         fab = activity.findViewById(R.id.fab);
 160         fab.setOnClickListener(v -> onFabPressed());
 161
 162         Bundle args = getArguments();
 163         if (args != null) {
 164             String error = args.getString("error");
 165             if (error != null) {
 166                 // TODO display error
 167             }
 168             else {
 169                 viewModel.reset();
 170             }
 171         }
 172     }
 173     private void onFabPressed() {
 174         fab.setEnabled(false);
 175         if (mListener != null) {
 176             Date date = viewModel.getDate();
 177             LedgerTransaction tr =
 178                     new LedgerTransaction(null, date, viewModel.getDescription(), mProfile);
 179
 180             LedgerTransactionAccount emptyAmountAccount = null;
 181             float emptyAmountAccountBalance = 0;
 182             for (int i = 0; i < viewModel.getAccountCount(); i++) {
 183                 LedgerTransactionAccount acc = viewModel.getAccount(i);
 184                 if (acc.getAccountName()
 185                        .trim()
 186                        .isEmpty())
 187                     continue;
 188
 189                 if (acc.isAmountSet()) {
 190                     emptyAmountAccountBalance += acc.getAmount();
 191                 }
 192                 else {
 193                     emptyAmountAccount = acc;
 194                 }
 195
 196                 tr.addAccount(acc);
 197             }
 198
 199             if (emptyAmountAccount != null)
 200                 emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 201
 202             mListener.onTransactionSave(tr);
 203         }
 204     }
 205
 206     @Override
 207     public void onAttach(@NotNull Context context) {
 208         super.onAttach(context);
 209         if (context instanceof OnNewTransactionFragmentInteractionListener) {
 210             mListener = (OnNewTransactionFragmentInteractionListener) context;
 211         }
 212         else {
 213             throw new RuntimeException(
 214                     context.toString() + " must implement OnFragmentInteractionListener");
 215         }
 216     }
 217
 218     @Override
 219     public void onDetach() {
 220         super.onDetach();
 221         mListener = null;
 222     }
 223
 224     /**
 225      * This interface must be implemented by activities that contain this
 226      * fragment to allow an interaction in this fragment to be communicated
 227      * to the activity and potentially other fragments contained in that
 228      * activity.
 229      * <p>
 230      * See the Android Training lesson <a href=
 231      * "http://developer.android.com/training/basics/fragments/communicating.html"
 232      * >Communicating with Other Fragments</a> for more information.
 233      */
 234     public interface OnNewTransactionFragmentInteractionListener {
 235         void onTransactionSave(LedgerTransaction tr);
 236     }
 237 }