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