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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.documentsui.sorting;
     18 
     19 import android.view.View;
     20 
     21 import com.android.documentsui.R;
     22 import com.android.documentsui.sorting.SortModel.SortDimensionId;
     23 
     24 import javax.annotation.Nullable;
     25 
     26 /**
     27  * View controller for table header that associates header cells in table header and columns.
     28  */
     29 public final class TableHeaderController implements SortController.WidgetController {
     30     private View mTableHeader;
     31 
     32     private final HeaderCell mTitleCell;
     33     private final HeaderCell mSummaryCell;
     34     private final HeaderCell mSizeCell;
     35     private final HeaderCell mDateCell;
     36 
     37     // We assign this here porque each method reference creates a new object
     38     // instance (which is wasteful).
     39     private final View.OnClickListener mOnCellClickListener = this::onCellClicked;
     40     private final SortModel.UpdateListener mModelListener = this::onModelUpdate;
     41 
     42     private final SortModel mModel;
     43 
     44     private TableHeaderController(SortModel sortModel, View tableHeader) {
     45         assert(sortModel != null);
     46         assert(tableHeader != null);
     47 
     48         mModel = sortModel;
     49         mTableHeader = tableHeader;
     50 
     51         mTitleCell = (HeaderCell) tableHeader.findViewById(android.R.id.title);
     52         mSummaryCell = (HeaderCell) tableHeader.findViewById(android.R.id.summary);
     53         mSizeCell = (HeaderCell) tableHeader.findViewById(R.id.size);
     54         mDateCell = (HeaderCell) tableHeader.findViewById(R.id.date);
     55 
     56         onModelUpdate(mModel, SortModel.UPDATE_TYPE_UNSPECIFIED);
     57 
     58         mModel.addListener(mModelListener);
     59     }
     60 
     61     private void onModelUpdate(SortModel model, int updateTypeUnspecified) {
     62         bindCell(mTitleCell, SortModel.SORT_DIMENSION_ID_TITLE);
     63         bindCell(mSummaryCell, SortModel.SORT_DIMENSION_ID_SUMMARY);
     64         bindCell(mSizeCell, SortModel.SORT_DIMENSION_ID_SIZE);
     65         bindCell(mDateCell, SortModel.SORT_DIMENSION_ID_DATE);
     66     }
     67 
     68     @Override
     69     public void setVisibility(int visibility) {
     70         mTableHeader.setVisibility(visibility);
     71     }
     72 
     73     @Override
     74     public void destroy() {
     75         mModel.removeListener(mModelListener);
     76     }
     77 
     78     private void bindCell(HeaderCell cell, @SortDimensionId int id) {
     79         assert(cell != null);
     80         SortDimension dimension = mModel.getDimensionById(id);
     81 
     82         cell.setTag(dimension);
     83 
     84         cell.onBind(dimension);
     85         if (dimension.getVisibility() == View.VISIBLE
     86                 && dimension.getSortCapability() != SortDimension.SORT_CAPABILITY_NONE) {
     87             cell.setOnClickListener(mOnCellClickListener);
     88         } else {
     89             cell.setOnClickListener(null);
     90         }
     91     }
     92 
     93     private void onCellClicked(View v) {
     94         SortDimension dimension = (SortDimension) v.getTag();
     95 
     96         mModel.sortByUser(dimension.getId(), dimension.getNextDirection());
     97     }
     98 
     99     public static @Nullable TableHeaderController create(
    100             SortModel sortModel, @Nullable View tableHeader) {
    101         return (tableHeader == null) ? null : new TableHeaderController(sortModel, tableHeader);
    102     }
    103 }
    104