app/src/main/java/net/ktnx/mobileledger/ui/transaction_list/TransactionListAdapter.java

   1 /*
   2  * Copyright © 2021 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.transaction_list;
  19
  20 import android.view.LayoutInflater;
  21 import android.view.ViewGroup;
  22
  23 import androidx.annotation.NonNull;
  24 import androidx.recyclerview.widget.AsyncListDiffer;
  25 import androidx.recyclerview.widget.DiffUtil;
  26 import androidx.recyclerview.widget.RecyclerView;
  27
  28 import net.ktnx.mobileledger.databinding.LastUpdateLayoutBinding;
  29 import net.ktnx.mobileledger.databinding.TransactionDelimiterBinding;
  30 import net.ktnx.mobileledger.databinding.TransactionListRowBinding;
  31 import net.ktnx.mobileledger.model.LedgerTransaction;
  32 import net.ktnx.mobileledger.model.TransactionListItem;
  33 import net.ktnx.mobileledger.utils.Logger;
  34 import net.ktnx.mobileledger.utils.Misc;
  35
  36 import java.util.List;
  37 import java.util.Locale;
  38
  39 public class TransactionListAdapter extends RecyclerView.Adapter<TransactionRowHolderBase> {
  40     private final AsyncListDiffer<TransactionListItem> listDiffer;
  41     public TransactionListAdapter() {
  42         super();
  43
  44         setHasStableIds(true);
  45
  46         listDiffer = new AsyncListDiffer<>(this, new DiffUtil.ItemCallback<TransactionListItem>() {
  47             @Override
  48             public boolean areItemsTheSame(@NonNull TransactionListItem oldItem,
  49                                            @NonNull TransactionListItem newItem) {
  50                 if (oldItem.getType() != newItem.getType())
  51                     return false;
  52                 switch (oldItem.getType()) {
  53                     case DELIMITER:
  54                         return (oldItem.getDate()
  55                                        .equals(newItem.getDate()));
  56                     case TRANSACTION:
  57                         return oldItem.getTransaction()
  58                                       .getLedgerId() == newItem.getTransaction()
  59                                                                .getLedgerId();
  60                     case HEADER:
  61                         return true;    // there can be only one header
  62                     default:
  63                         throw new IllegalStateException(
  64                                 String.format(Locale.US, "Unexpected transaction item type %s",
  65                                         oldItem.getType()));
  66                 }
  67             }
  68             @Override
  69             public boolean areContentsTheSame(@NonNull TransactionListItem oldItem,
  70                                               @NonNull TransactionListItem newItem) {
  71                 switch (oldItem.getType()) {
  72                     case DELIMITER:
  73                         return oldItem.isMonthShown() == newItem.isMonthShown();
  74                     case TRANSACTION:
  75                         return oldItem.getTransaction()
  76                                       .equals(newItem.getTransaction()) &&
  77                                Misc.equalStrings(oldItem.getBoldAccountName(),
  78                                        newItem.getBoldAccountName());
  79                     case HEADER:
  80                         // headers don't differ in their contents. they observe the last update
  81                         // date and react to its changes
  82                         return true;
  83                     default:
  84                         throw new IllegalStateException(
  85                                 String.format(Locale.US, "Unexpected transaction item type %s",
  86                                         oldItem.getType()));
  87
  88                 }
  89             }
  90         });
  91     }
  92     @Override
  93     public long getItemId(int position) {
  94         TransactionListItem item = listDiffer.getCurrentList()
  95                                              .get(position);
  96         switch (item.getType()) {
  97             case HEADER:
  98                 return -1;
  99             case TRANSACTION:
 100                 return item.getTransaction()
 101                            .getLedgerId();
 102             case DELIMITER:
 103                 return -item.getDate()
 104                             .toDate()
 105                             .getTime();
 106             default:
 107                 throw new IllegalStateException("Unexpected value: " + item.getType());
 108         }
 109     }
 110     @Override
 111     public int getItemViewType(int position) {
 112         return listDiffer.getCurrentList()
 113                          .get(position)
 114                          .getType()
 115                          .ordinal();
 116     }
 117     public void onBindViewHolder(@NonNull TransactionRowHolderBase holder, int position) {
 118         TransactionListItem item = listDiffer.getCurrentList()
 119                                              .get(position);
 120
 121         // in a race when transaction value is reduced, but the model hasn't been notified yet
 122         // the view will disappear when the notifications reaches the model, so by simply omitting
 123         // the out-of-range get() call nothing bad happens - just a to-be-deleted view remains
 124         // a bit longer
 125         if (item == null)
 126             return;
 127
 128         final TransactionListItem.Type newType = item.getType();
 129
 130         switch (newType) {
 131             case TRANSACTION:
 132                 holder.asTransaction()
 133                       .bind(item, item.getBoldAccountName());
 134
 135                 break;
 136             case DELIMITER:
 137                 holder.asDelimiter()
 138                       .bind(item);
 139                 break;
 140             case HEADER:
 141                 holder.asHeader()
 142                       .bind();
 143
 144                 break;
 145             default:
 146                 throw new IllegalStateException("Unexpected value: " + newType);
 147         }
 148     }
 149     @NonNull
 150     @Override
 151     public TransactionRowHolderBase onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
 152 //        debug("perf", "onCreateViewHolder called");
 153         final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
 154
 155         switch (TransactionListItem.Type.valueOf(viewType)) {
 156             case TRANSACTION:
 157                 return new TransactionRowHolder(
 158                         TransactionListRowBinding.inflate(inflater, parent, false));
 159             case DELIMITER:
 160                 return new TransactionListDelimiterRowHolder(
 161                         TransactionDelimiterBinding.inflate(inflater, parent, false));
 162             case HEADER:
 163                 return new TransactionListLastUpdateRowHolder(
 164                         LastUpdateLayoutBinding.inflate(inflater, parent, false));
 165             default:
 166                 throw new IllegalStateException("Unexpected value: " + viewType);
 167         }
 168     }
 169
 170     @Override
 171     public int getItemCount() {
 172         return listDiffer.getCurrentList()
 173                          .size();
 174     }
 175     public void setTransactions(List<TransactionListItem> newList) {
 176         Logger.debug("transactions",
 177                 String.format(Locale.US, "Got new transaction list (%d items)", newList.size()));
 178         listDiffer.submitList(newList);
 179     }
 180 }