content: /*
   * Copyright (C) 2013 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.datetimepicker.date;
  
  import android.content.Context;
  import android.content.res.Resources;
  import android.graphics.drawable.StateListDrawable;
  import android.view.View;
  import android.view.ViewGroup;
  import android.view.accessibility.AccessibilityEvent;
  import android.widget.AdapterView;
  import android.widget.AdapterView.OnItemClickListener;
  import android.widget.ArrayAdapter;
  import android.widget.ListView;
  import android.widget.TextView;
  
  import com.android.datetimepicker.R;
  import com.android.datetimepicker.date.DatePickerDialog.OnDateChangedListener;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Displays a selectable list of years.
   */
  class YearPickerView extends ListView implements OnItemClickListener, OnDateChangedListener {
      private static final String TAG = "YearPickerView";
  
      private final DatePickerController mController;
      private YearAdapter mAdapter;
      private int mViewSize;
      private int mChildSize;
      private TextViewWithCircularIndicator mSelectedView;
  
      /**
       * @param context
       */
      public YearPickerView(Context context, DatePickerController controller) {
          super(context);
          mController = controller;
          mController.registerOnDateChangedListener(this);
          ViewGroup.LayoutParams frame = new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT,
                  LayoutParams.WRAP_CONTENT);
          setLayoutParams(frame);
          Resources res = context.getResources();
          mViewSize = res.getDimensionPixelOffset(R.dimen.date_picker_view_animator_height);
          mChildSize = res.getDimensionPixelOffset(R.dimen.year_label_height);
          setVerticalFadingEdgeEnabled(true);
          setFadingEdgeLength(mChildSize / 3);
          init(context);
          setOnItemClickListener(this);
          setSelector(new StateListDrawable());
          setDividerHeight(0);
          onDateChanged();
      }
  
      private void init(Context context) {
          ArrayList<String> years = new ArrayList<String>();
          for (int year = mController.getMinYear(); year <= mController.getMaxYear(); year++) {
              years.add(String.format("%d", year));
          }
          mAdapter = new YearAdapter(context, R.layout.year_label_text_view, years);
          setAdapter(mAdapter);
      }
  
      @Override
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
          mController.tryVibrate();
          TextViewWithCircularIndicator clickedView = (TextViewWithCircularIndicator) view;
          if (clickedView != null) {
              if (clickedView != mSelectedView) {
                  if (mSelectedView != null) {
                      mSelectedView.drawIndicator(false);
                      mSelectedView.requestLayout();
                  }
                  clickedView.drawIndicator(true);
                  clickedView.requestLayout();
                  mSelectedView = clickedView;
              }
              mController.onYearSelected(getYearFromTextView(clickedView));
              mAdapter.notifyDataSetChanged();
          }
      }
  
      private static int getYearFromTextView(TextView view) {
          return Integer.parseInt(view.getText().toString());
      }
  
      private class YearAdapter extends ArrayAdapter<String> {
  
          public YearAdapter(Context context, int resource, List<String> objects) {
              super(context, resource, objects);
          }
  
          @Override
          public View getView(int position, View convertView, ViewGroup parent) {
              TextViewWithCircularIndicator v = (TextViewWithCircularIndicator)
                      super.getView(position, convertView, parent);
              v.requestLayout();
              int year = getYearFromTextView(v);
              boolean selected = mController.getSelectedDay().year == year;
              v.drawIndicator(selected);
              if (selected) {
                  mSelectedView = v;
              }
              return v;
          }
      }
  
      public void postSetSelectionCentered(final int position) {
          postSetSelectionFromTop(position, mViewSize / 2 - mChildSize / 2);
      }
  
      public void postSetSelectionFromTop(final int position, final int offset) {
          post(new Runnable() {
  
              @Override
              public void run() {
                  setSelectionFromTop(position, offset);
                  requestLayout();
              }
          });
      }
  
      public int getFirstPositionOffset() {
          final View firstChild = getChildAt(0);
          if (firstChild == null) {
              return 0;
          }
          return firstChild.getTop();
      }
  
      @Override
      public void onDateChanged() {
          mAdapter.notifyDataSetChanged();
          postSetSelectionCentered(mController.getSelectedDay().year - mController.getMinYear());
      }
  
      @Override
      public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
          super.onInitializeAccessibilityEvent(event);
          if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
              event.setFromIndex(0);
              event.setToIndex(0);
          }
      }
  }
  