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      1 /*
      2  * Copyright 2018 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 androidx.car.widget;
     18 
     19 import android.content.Context;
     20 import android.view.LayoutInflater;
     21 import android.view.View;
     22 import android.widget.TextView;
     23 
     24 import java.util.Collection;
     25 
     26 import androidx.annotation.NonNull;
     27 import androidx.car.R;
     28 import androidx.gridlayout.widget.GridLayout;
     29 
     30 /**
     31  * This view shows a grid of alphabetic letters that you can tap on to advance a list to the
     32  * beginning of that list.
     33  */
     34 public class AlphaJumpOverlayView extends GridLayout {
     35     private IAlphaJumpAdapter mAdapter;
     36     private PagedListView mPagedListView;
     37     private Collection<IAlphaJumpAdapter.Bucket> mBuckets;
     38 
     39     public AlphaJumpOverlayView(@NonNull Context context) {
     40         super(context);
     41         setBackgroundResource(R.color.car_card);
     42         setColumnCount(context.getResources().getInteger(R.integer.alpha_jump_button_columns));
     43         setUseDefaultMargins(false);
     44     }
     45 
     46     void init(PagedListView plv, IAlphaJumpAdapter adapter) {
     47         mPagedListView = plv;
     48         mAdapter = adapter;
     49         mBuckets = adapter.getAlphaJumpBuckets();
     50 
     51         createButtons();
     52     }
     53 
     54     @Override
     55     protected void onVisibilityChanged(View changedView, int visibility) {
     56         // TODO: change the hamburger button into a back button...
     57         if (visibility == VISIBLE && changedView == this) {
     58             mAdapter.onAlphaJumpEnter();
     59         }
     60     }
     61 
     62     private void createButtons() {
     63         LayoutInflater inflater = LayoutInflater.from(getContext());
     64         removeAllViews();
     65         for (IAlphaJumpAdapter.Bucket bucket : mBuckets) {
     66             View container = inflater.inflate(R.layout.car_alpha_jump_button, this, false);
     67             TextView btn = container.findViewById(R.id.button);
     68             btn.setText(bucket.getLabel());
     69             btn.setOnClickListener(this::onButtonClick);
     70             btn.setTag(bucket);
     71             if (bucket.isEmpty()) {
     72                 btn.setEnabled(false);
     73             }
     74             addView(container);
     75         }
     76     }
     77 
     78     private void onButtonClick(View v) {
     79         setVisibility(View.GONE);
     80         IAlphaJumpAdapter.Bucket bucket = (IAlphaJumpAdapter.Bucket) v.getTag();
     81         if (bucket != null) {
     82             mAdapter.onAlphaJumpLeave(bucket);
     83 
     84             mPagedListView.snapToPosition(bucket.getIndex());
     85         }
     86     }
     87 }
     88