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
17package com.android.datetimepicker.date;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.graphics.drawable.StateListDrawable;
22import android.util.Log;
23import android.view.View;
24import android.view.ViewGroup;
25import android.view.accessibility.AccessibilityEvent;
26import android.widget.AdapterView;
27import android.widget.AdapterView.OnItemClickListener;
28import android.widget.ArrayAdapter;
29import android.widget.ListView;
30import android.widget.TextView;
31
32import com.android.datetimepicker.R;
33import com.android.datetimepicker.Utils;
34import com.android.datetimepicker.date.DatePickerDialog.OnDateChangedListener;
35
36import java.util.ArrayList;
37import java.util.List;
38
39/**
40 * Displays a selectable list of years.
41 */
42public 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