YearPickerView.java revision 71492ab60892087f3e989b876b82f5c0249b3b14 
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.widget.AdapterView;
25import android.widget.AdapterView.OnItemClickListener;
26import android.widget.ArrayAdapter;
27import android.widget.ListView;
28import android.widget.TextView;
29
30import com.android.datetimepicker.R;
31import com.android.datetimepicker.date.DatePickerDialog.OnDateChangedListener;
32
33import java.util.ArrayList;
34import java.util.List;
35
36/**
37 * Displays a selectable list of years.
38 */
39public class YearPickerView extends ListView implements OnItemClickListener, OnDateChangedListener {
40
41    private final DatePickerController mController;
42    private YearAdapter mAdapter;
43    private int mViewSize;
44    private int mChildSize;
45    private TextViewWithCircularIndicator mSelectedView;
46
47    /**
48     * @param context
49     */
50    public YearPickerView(Context context, DatePickerController controller) {
51        super(context);
52        mController = controller;
53        mController.registerOnDateChangedListener(this);
54        ViewGroup.LayoutParams frame = new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT,
55                LayoutParams.WRAP_CONTENT);
56        setLayoutParams(frame);
57        Resources res = context.getResources();
58        mViewSize = res.getDimensionPixelOffset(R.dimen.date_picker_view_animator_height);
59        mChildSize = res.getDimensionPixelOffset(R.dimen.year_label_height);
60        setVerticalFadingEdgeEnabled(true);
61        setFadingEdgeLength(mChildSize / 3);
62        init(context);
63        setOnItemClickListener(this);
64        setSelector(new StateListDrawable());
65        setDividerHeight(0);
66        onDateChanged();
67    }
68
69    private void init(Context context) {
70        ArrayList<String> years = new ArrayList<String>();
71        for (int year = mController.getMinYear(); year <= mController.getMaxYear(); year++) {
72            years.add(String.format("%d", year));
73        }
74        mAdapter = new YearAdapter(context, R.layout.year_label_text_view, years);
75        setAdapter(mAdapter);
76    }
77
78    @Override
79    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
80        mController.tryVibrate();
81        TextViewWithCircularIndicator clickedView = (TextViewWithCircularIndicator) view;
82        if (clickedView != null) {
83            if (clickedView != mSelectedView) {
84                if (mSelectedView != null) {
85                    mSelectedView.drawIndicator(false);
86                    mSelectedView.requestLayout();
87                }
88                clickedView.drawIndicator(true);
89                clickedView.requestLayout();
90                mSelectedView = clickedView;
91            }
92            mController.onYearSelected(getYearFromTextView(clickedView));
93            mAdapter.notifyDataSetChanged();
94        }
95    }
96
97    private int getYearFromTextView(TextView view) {
98        return Integer.valueOf(view.getText().toString());
99    }
100
101    private class YearAdapter extends ArrayAdapter<String> {
102
103        public YearAdapter(Context context, int resource, List<String> objects) {
104            super(context, resource, objects);
105        }
106
107        @Override
108        public View getView(int position, View convertView, ViewGroup parent) {
109            TextViewWithCircularIndicator v = (TextViewWithCircularIndicator)
110                    super.getView(position, convertView, parent);
111            v.requestLayout();
112            int year = getYearFromTextView(v);
113            boolean selected = mController.getSelectedDay().year == year;
114            v.drawIndicator(selected);
115            if (selected) {
116                mSelectedView = v;
117            }
118            return v;
119        }
120    }
121
122    public void postSetSelectionCentered(final int position) {
123        postSetSelectionFromTop(position, mViewSize / 2 - mChildSize / 2);
124    }
125
126    public void postSetSelectionFromTop(final int position, final int offset) {
127        post(new Runnable() {
128
129            @Override
130            public void run() {
131                setSelectionFromTop(position, offset);
132                requestLayout();
133            }
134        });
135    }
136
137    public int getFirstPositionOffset() {
138        final View firstChild = getChildAt(0);
139        if (firstChild == null) {
140            return 0;
141        }
142        return firstChild.getTop();
143    }
144
145    @Override
146    public void onDateChanged() {
147        mAdapter.notifyDataSetChanged();
148        postSetSelectionCentered(mController.getSelectedDay().year - mController.getMinYear());
149    }
150}
151