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.ViewModelProvider;
  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
  60 // TODO: offer to undo account remove-on-swipe
  61
  62 public class NewTransactionFragment extends Fragment {
  63     private NewTransactionItemsAdapter listAdapter;
  64     private NewTransactionModel viewModel;
  65     private RecyclerView list;
  66     private FloatingActionButton fab;
  67     private OnNewTransactionFragmentInteractionListener mListener;
  68     private MobileLedgerProfile mProfile;
  69     public NewTransactionFragment() {
  70         // Required empty public constructor
  71         setHasOptionsMenu(true);
  72     }
  73     @Override
  74     public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
  75         super.onCreateOptionsMenu(menu, inflater);
  76         inflater.inflate(R.menu.new_transaction_fragment, menu);
  77         menu.findItem(R.id.action_reset_new_transaction_activity)
  78             .setOnMenuItemClickListener(item -> {
  79                 listAdapter.reset();
  80                 return true;
  81             });
  82     }
  83     @Override
  84     public View onCreateView(LayoutInflater inflater, ViewGroup container,
  85                              Bundle savedInstanceState) {
  86         // Inflate the layout for this fragment
  87         return inflater.inflate(R.layout.fragment_new_transaction, container, false);
  88     }
  89
  90     @Override
  91     public void onActivityCreated(@Nullable Bundle savedInstanceState) {
  92         super.onActivityCreated(savedInstanceState);
  93         FragmentActivity activity = getActivity();
  94         if (activity == null)
  95             throw new RSInvalidStateException(
  96                     "getActivity() returned null within onActivityCreated()");
  97
  98         list = activity.findViewById(R.id.new_transaction_accounts);
  99         viewModel = new ViewModelProvider(activity).get(NewTransactionModel.class);
 100         mProfile = Data.profile.getValue();
 101         listAdapter = new NewTransactionItemsAdapter(viewModel, mProfile);
 102         list.setAdapter(listAdapter);
 103         list.setLayoutManager(new LinearLayoutManager(activity));
 104         Data.profile.observe(getViewLifecycleOwner(), profile -> {
 105             mProfile = profile;
 106             listAdapter.setProfile(profile);
 107         });
 108         listAdapter.notifyDataSetChanged();
 109         new ItemTouchHelper(new ItemTouchHelper.Callback() {
 110             @Override
 111             public int getMovementFlags(@NonNull RecyclerView recyclerView,
 112                                         @NonNull RecyclerView.ViewHolder viewHolder) {
 113                 int flags = makeFlag(ItemTouchHelper.ACTION_STATE_IDLE, ItemTouchHelper.END);
 114                 // the top item is always there (date and description)
 115                 if (viewHolder.getAdapterPosition() > 0) {
 116                     if (viewModel.getAccountCount() > 2) {
 117                         flags |= makeFlag(ItemTouchHelper.ACTION_STATE_SWIPE,
 118                                 ItemTouchHelper.START | ItemTouchHelper.END);
 119                     }
 120                 }
 121
 122                 return flags;
 123             }
 124             @Override
 125             public boolean onMove(@NonNull RecyclerView recyclerView,
 126                                   @NonNull RecyclerView.ViewHolder viewHolder,
 127                                   @NonNull RecyclerView.ViewHolder target) {
 128                 return false;
 129             }
 130             @Override
 131             public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
 132                 if (viewModel.getAccountCount() == 2)
 133                     Snackbar.make(list, R.string.msg_at_least_two_accounts_are_required,
 134                             Snackbar.LENGTH_LONG)
 135                             .setAction("Action", null)
 136                             .show();
 137                 else {
 138                     int pos = viewHolder.getAdapterPosition();
 139                     viewModel.removeItem(pos - 1);
 140                     listAdapter.notifyItemRemoved(pos);
 141                     viewModel.sendCountNotifications(); // needed after items re-arrangement
 142                     viewModel.checkTransactionSubmittable(listAdapter);
 143                 }
 144             }
 145         }).attachToRecyclerView(list);
 146
 147         viewModel.isSubmittable()
 148                  .observe(getViewLifecycleOwner(), isSubmittable -> {
 149                      if (isSubmittable) {
 150                          if (fab != null) {
 151                              fab.show();
 152                              fab.setEnabled(true);
 153                          }
 154                      }
 155                      else {
 156                          if (fab != null) {
 157                              fab.hide();
 158                          }
 159                      }
 160                  });
 161         viewModel.checkTransactionSubmittable(listAdapter);
 162
 163         fab = activity.findViewById(R.id.fab);
 164         fab.setOnClickListener(v -> onFabPressed());
 165
 166         boolean keep = false;
 167
 168         Bundle args = getArguments();
 169         if (args != null) {
 170             String error = args.getString("error");
 171             if (error != null) {
 172                 Logger.debug("new-trans-f", String.format("Got error: %s", error));
 173                 Snackbar.make(list, error, Snackbar.LENGTH_LONG)
 174                         .show();
 175                 keep = true;
 176             }
 177         }
 178
 179         int focused = 0;
 180         if (savedInstanceState != null) {
 181             keep |= savedInstanceState.getBoolean("keep", true);
 182             focused = savedInstanceState.getInt("focused", 0);
 183         }
 184
 185         if (!keep)
 186             viewModel.reset();
 187         else {
 188             viewModel.setFocusedItem(focused);
 189         }
 190     }
 191     @Override
 192     public void onSaveInstanceState(@NonNull Bundle outState) {
 193         super.onSaveInstanceState(outState);
 194         outState.putBoolean("keep", true);
 195         final int focusedItem = viewModel.getFocusedItem();
 196         outState.putInt("focused", focusedItem);
 197     }
 198     private void onFabPressed() {
 199         fab.setEnabled(false);
 200         Misc.hideSoftKeyboard(this);
 201         if (mListener != null) {
 202             Date date = viewModel.getDate();
 203             LedgerTransaction tr =
 204                     new LedgerTransaction(null, date, viewModel.getDescription(), mProfile);
 205
 206             LedgerTransactionAccount emptyAmountAccount = null;
 207             float emptyAmountAccountBalance = 0;
 208             for (int i = 0; i < viewModel.getAccountCount(); i++) {
 209                 LedgerTransactionAccount acc =
 210                         new LedgerTransactionAccount(viewModel.getAccount(i));
 211                 if (acc.getAccountName()
 212                        .trim()
 213                        .isEmpty())
 214                     continue;
 215
 216                 if (acc.isAmountSet()) {
 217                     emptyAmountAccountBalance += acc.getAmount();
 218                 }
 219                 else {
 220                     emptyAmountAccount = acc;
 221                 }
 222
 223                 tr.addAccount(acc);
 224             }
 225
 226             if (emptyAmountAccount != null)
 227                 emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 228
 229             mListener.onTransactionSave(tr);
 230         }
 231     }
 232
 233     @Override
 234     public void onAttach(@NotNull Context context) {
 235         super.onAttach(context);
 236         if (context instanceof OnNewTransactionFragmentInteractionListener) {
 237             mListener = (OnNewTransactionFragmentInteractionListener) context;
 238         }
 239         else {
 240             throw new RuntimeException(
 241                     context.toString() + " must implement OnFragmentInteractionListener");
 242         }
 243     }
 244
 245     @Override
 246     public void onDetach() {
 247         super.onDetach();
 248         mListener = null;
 249     }
 250
 251     /**
 252      * This interface must be implemented by activities that contain this
 253      * fragment to allow an interaction in this fragment to be communicated
 254      * to the activity and potentially other fragments contained in that
 255      * activity.
 256      * <p>
 257      * See the Android Training lesson <a href=
 258      * "http://developer.android.com/training/basics/fragments/communicating.html"
 259      * >Communicating with Other Fragments</a> for more information.
 260      */
 261     public interface OnNewTransactionFragmentInteractionListener {
 262         void onTransactionSave(LedgerTransaction tr);
 263     }
 264 }