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 import net.ktnx.mobileledger.utils.Misc;
  47
  48 import org.jetbrains.annotations.NotNull;
  49
  50 import java.util.Date;
  51
  52 /**
  53  * A simple {@link Fragment} subclass.
  54  * Activities that contain this fragment must implement the
  55  * {@link OnNewTransactionFragmentInteractionListener} interface
  56  * to handle interaction events.
  57  */
  58 public class NewTransactionFragment extends Fragment {
  59     private NewTransactionItemsAdapter listAdapter;
  60     private NewTransactionModel viewModel;
  61     private RecyclerView list;
  62     private FloatingActionButton fab;
  63     private OnNewTransactionFragmentInteractionListener mListener;
  64     private MobileLedgerProfile mProfile;
  65     public NewTransactionFragment() {
  66         // Required empty public constructor
  67         setHasOptionsMenu(true);
  68     }
  69     @Override
  70     public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
  71         super.onCreateOptionsMenu(menu, inflater);
  72         inflater.inflate(R.menu.new_transaction_fragment, menu);
  73         menu.findItem(R.id.action_reset_new_transaction_activity)
  74             .setOnMenuItemClickListener(item -> {
  75                 listAdapter.reset();
  76                 return true;
  77             });
  78     }
  79     @Override
  80     public View onCreateView(LayoutInflater inflater, ViewGroup container,
  81                              Bundle savedInstanceState) {
  82         // Inflate the layout for this fragment
  83         return inflater.inflate(R.layout.fragment_new_transaction, container, false);
  84     }
  85
  86     @Override
  87     public void onActivityCreated(@Nullable Bundle savedInstanceState) {
  88         super.onActivityCreated(savedInstanceState);
  89         Activity activity = getActivity();
  90         if (activity == null)
  91             throw new RSInvalidStateException(
  92                     "getActivity() returned null within onActivityCreated()");
  93
  94         list = activity.findViewById(R.id.new_transaction_accounts);
  95         viewModel = ViewModelProviders.of(this)
  96                                       .get(NewTransactionModel.class);
  97         mProfile = Data.profile.getValue();
  98         listAdapter = new NewTransactionItemsAdapter(viewModel, mProfile);
  99         list.setAdapter(listAdapter);
 100         list.setLayoutManager(new LinearLayoutManager(activity));
 101         Data.profile.observe(this, profile -> {
 102             mProfile = profile;
 103             listAdapter.setProfile(profile);
 104         });
 105         listAdapter.notifyDataSetChanged();
 106         new ItemTouchHelper(new ItemTouchHelper.Callback() {
 107             @Override
 108             public int getMovementFlags(@NonNull RecyclerView recyclerView,
 109                                         @NonNull RecyclerView.ViewHolder viewHolder) {
 110                 int flags = makeFlag(ItemTouchHelper.ACTION_STATE_IDLE, ItemTouchHelper.END);
 111                 // the top item is always there (date and description)
 112                 if (viewHolder.getAdapterPosition() > 0) {
 113                     if (viewModel.getAccountCount() > 2) {
 114                         flags |= makeFlag(ItemTouchHelper.ACTION_STATE_SWIPE,
 115                                 ItemTouchHelper.START | ItemTouchHelper.END);
 116                     }
 117                 }
 118
 119                 return flags;
 120             }
 121             @Override
 122             public boolean onMove(@NonNull RecyclerView recyclerView,
 123                                   @NonNull RecyclerView.ViewHolder viewHolder,
 124                                   @NonNull RecyclerView.ViewHolder target) {
 125                 return false;
 126             }
 127             @Override
 128             public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
 129                 if (viewModel.getAccountCount() == 2)
 130                     Snackbar.make(list, R.string.msg_at_least_two_accounts_are_required,
 131                             Snackbar.LENGTH_LONG)
 132                             .setAction("Action", null)
 133                             .show();
 134                 else {
 135                     int pos = viewHolder.getAdapterPosition();
 136                     viewModel.removeItem(pos - 1);
 137                     listAdapter.notifyItemRemoved(pos);
 138                     viewModel.sendCountNotifications(); // needed after items re-arrangement
 139                     viewModel.checkTransactionSubmittable(listAdapter);
 140                 }
 141             }
 142         }).attachToRecyclerView(list);
 143
 144         viewModel.isSubmittable()
 145                  .observe(this, isSubmittable -> {
 146                      if (isSubmittable) {
 147                          if (fab != null) {
 148                              fab.show();
 149                              fab.setEnabled(true);
 150                          }
 151                      }
 152                      else {
 153                          if (fab != null) {
 154                              fab.hide();
 155                          }
 156                      }
 157                  });
 158         viewModel.checkTransactionSubmittable(listAdapter);
 159
 160         fab = activity.findViewById(R.id.fab);
 161         fab.setOnClickListener(v -> onFabPressed());
 162
 163         Bundle args = getArguments();
 164         if (args != null) {
 165             String error = args.getString("error");
 166             if (error != null) {
 167                 // TODO display error
 168             }
 169             else {
 170             }
 171         }
 172
 173         if (savedInstanceState != null) {
 174             boolean keep = savedInstanceState.getBoolean("keep", true);
 175             if (!keep)
 176                 viewModel.reset();
 177             else {
 178                 final int focused = savedInstanceState.getInt("focused", 0);
 179                 viewModel.setFocusedItem(focused);
 180             }
 181         }
 182     }
 183     @Override
 184     public void onSaveInstanceState(@NonNull Bundle outState) {
 185         super.onSaveInstanceState(outState);
 186         outState.putBoolean("keep", true);
 187         final int focusedItem = viewModel.getFocusedItem();
 188         outState.putInt("focused", focusedItem);
 189     }
 190     private void onFabPressed() {
 191         fab.setEnabled(false);
 192         Misc.hideSoftKeyboard(this);
 193         if (mListener != null) {
 194             Date date = viewModel.getDate();
 195             LedgerTransaction tr =
 196                     new LedgerTransaction(null, date, viewModel.getDescription(), mProfile);
 197
 198             LedgerTransactionAccount emptyAmountAccount = null;
 199             float emptyAmountAccountBalance = 0;
 200             for (int i = 0; i < viewModel.getAccountCount(); i++) {
 201                 LedgerTransactionAccount acc = viewModel.getAccount(i);
 202                 if (acc.getAccountName()
 203                        .trim()
 204                        .isEmpty())
 205                     continue;
 206
 207                 if (acc.isAmountSet()) {
 208                     emptyAmountAccountBalance += acc.getAmount();
 209                 }
 210                 else {
 211                     emptyAmountAccount = acc;
 212                 }
 213
 214                 tr.addAccount(acc);
 215             }
 216
 217             if (emptyAmountAccount != null)
 218                 emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 219
 220             mListener.onTransactionSave(tr);
 221         }
 222     }
 223
 224     @Override
 225     public void onAttach(@NotNull Context context) {
 226         super.onAttach(context);
 227         if (context instanceof OnNewTransactionFragmentInteractionListener) {
 228             mListener = (OnNewTransactionFragmentInteractionListener) context;
 229         }
 230         else {
 231             throw new RuntimeException(
 232                     context.toString() + " must implement OnFragmentInteractionListener");
 233         }
 234     }
 235
 236     @Override
 237     public void onDetach() {
 238         super.onDetach();
 239         mListener = null;
 240     }
 241
 242     /**
 243      * This interface must be implemented by activities that contain this
 244      * fragment to allow an interaction in this fragment to be communicated
 245      * to the activity and potentially other fragments contained in that
 246      * activity.
 247      * <p>
 248      * See the Android Training lesson <a href=
 249      * "http://developer.android.com/training/basics/fragments/communicating.html"
 250      * >Communicating with Other Fragments</a> for more information.
 251      */
 252     public interface OnNewTransactionFragmentInteractionListener {
 253         void onTransactionSave(LedgerTransaction tr);
 254     }
 255 }