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      1 /*
      2  * Copyright (C) 2013 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.datetimepicker.date;
     18 
     19 import android.content.Context;
     20 import android.content.res.Resources;
     21 import android.graphics.drawable.StateListDrawable;
     22 import android.util.Log;
     23 import android.view.View;
     24 import android.view.ViewGroup;
     25 import android.view.accessibility.AccessibilityEvent;
     26 import android.widget.AdapterView;
     27 import android.widget.AdapterView.OnItemClickListener;
     28 import android.widget.ArrayAdapter;
     29 import android.widget.ListView;
     30 import android.widget.TextView;
     31 
     32 import com.android.datetimepicker.R;
     33 import com.android.datetimepicker.Utils;
     34 import com.android.datetimepicker.date.DatePickerDialog.OnDateChangedListener;
     35 
     36 import java.util.ArrayList;
     37 import java.util.List;
     38 
     39 /**
     40  * Displays a selectable list of years.
     41  */
     42 public class YearPickerView extends ListView implements OnItemClickListener, OnDateChangedListener {
     43     private static final String TAG = "YearPickerView";
     44 
     45     private final DatePickerController mController;
     46     private YearAdapter mAdapter;
     47     private int mViewSize;
     48     private int mChildSize;
     49     private TextViewWithCircularIndicator mSelectedView;
     50 
     51     /**
     52      * @param context
     53      */
     54     public YearPickerView(Context context, DatePickerController controller) {
     55         super(context);
     56         mController = controller;
     57         mController.registerOnDateChangedListener(this);
     58         ViewGroup.LayoutParams frame = new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT,
     59                 LayoutParams.WRAP_CONTENT);
     60         setLayoutParams(frame);
     61         Resources res = context.getResources();
     62         mViewSize = res.getDimensionPixelOffset(R.dimen.date_picker_view_animator_height);
     63         mChildSize = res.getDimensionPixelOffset(R.dimen.year_label_height);
     64         setVerticalFadingEdgeEnabled(true);
     65         setFadingEdgeLength(mChildSize / 3);
     66         init(context);
     67         setOnItemClickListener(this);
     68         setSelector(new StateListDrawable());
     69         setDividerHeight(0);
     70         onDateChanged();
     71     }
     72 
     73     private void init(Context context) {
     74         ArrayList<String> years = new ArrayList<String>();
     75         for (int year = mController.getMinYear(); year <= mController.getMaxYear(); year++) {
     76             years.add(String.format("%d", year));
     77         }
     78         mAdapter = new YearAdapter(context, R.layout.year_label_text_view, years);
     79         setAdapter(mAdapter);
     80     }
     81 
     82     @Override
     83     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
     84         mController.tryVibrate();
     85         TextViewWithCircularIndicator clickedView = (TextViewWithCircularIndicator) view;
     86         if (clickedView != null) {
     87             if (clickedView != mSelectedView) {
     88                 if (mSelectedView != null) {
     89                     mSelectedView.drawIndicator(false);
     90                     mSelectedView.requestLayout();
     91                 }
     92                 clickedView.drawIndicator(true);
     93                 clickedView.requestLayout();
     94                 mSelectedView = clickedView;
     95             }
     96             mController.onYearSelected(getYearFromTextView(clickedView));
     97             mAdapter.notifyDataSetChanged();
     98         }
     99     }
    100 
    101     private int getYearFromTextView(TextView view) {
    102         return Integer.valueOf(view.getText().toString());
    103     }
    104 
    105     private class YearAdapter extends ArrayAdapter<String> {
    106 
    107         public YearAdapter(Context context, int resource, List<String> objects) {
    108             super(context, resource, objects);
    109         }
    110 
    111         @Override
    112         public View getView(int position, View convertView, ViewGroup parent) {
    113             TextViewWithCircularIndicator v = (TextViewWithCircularIndicator)
    114                     super.getView(position, convertView, parent);
    115             v.requestLayout();
    116             int year = getYearFromTextView(v);
    117             boolean selected = mController.getSelectedDay().year == year;
    118             v.drawIndicator(selected);
    119             if (selected) {
    120                 mSelectedView = v;
    121             }
    122             return v;
    123         }
    124     }
    125 
    126     public void postSetSelectionCentered(final int position) {
    127         postSetSelectionFromTop(position, mViewSize / 2 - mChildSize / 2);
    128     }
    129 
    130     public void postSetSelectionFromTop(final int position, final int offset) {
    131         post(new Runnable() {
    132 
    133             @Override
    134             public void run() {
    135                 setSelectionFromTop(position, offset);
    136                 requestLayout();
    137             }
    138         });
    139     }
    140 
    141     public int getFirstPositionOffset() {
    142         final View firstChild = getChildAt(0);
    143         if (firstChild == null) {
    144             return 0;
    145         }
    146         return firstChild.getTop();
    147     }
    148 
    149     @Override
    150     public void onDateChanged() {
    151         mAdapter.notifyDataSetChanged();
    152         postSetSelectionCentered(mController.getSelectedDay().year - mController.getMinYear());
    153     }
    154 
    155     @Override
    156     public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
    157         super.onInitializeAccessibilityEvent(event);
    158         if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
    159             event.setFromIndex(0);
    160             event.setToIndex(0);
    161         }
    162     }
    163 }
    164