1/*
2 * Copyright (C) 2014 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 android.widget;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.util.AttributeSet;
22import android.view.View;
23import android.view.ViewGroup;
24import android.view.accessibility.AccessibilityEvent;
25
26import java.util.Calendar;
27
28import com.android.internal.R;
29
30/**
31 * Displays a selectable list of years.
32 */
33class YearPickerView extends ListView implements AdapterView.OnItemClickListener,
34        OnDateChangedListener {
35    private final Calendar mMinDate = Calendar.getInstance();
36    private final Calendar mMaxDate = Calendar.getInstance();
37
38    private final YearAdapter mAdapter;
39    private final int mViewSize;
40    private final int mChildSize;
41
42    private DatePickerController mController;
43
44    private int mSelectedPosition = -1;
45    private int mYearSelectedCircleColor;
46
47    public YearPickerView(Context context) {
48        this(context, null);
49    }
50
51    public YearPickerView(Context context, AttributeSet attrs) {
52        this(context, attrs, R.attr.listViewStyle);
53    }
54
55    public YearPickerView(Context context, AttributeSet attrs, int defStyleAttr) {
56        this(context, attrs, defStyleAttr, 0);
57    }
58
59    public YearPickerView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
60        super(context, attrs, defStyleAttr, defStyleRes);
61
62        final LayoutParams frame = new LayoutParams(
63                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
64        setLayoutParams(frame);
65
66        final Resources res = context.getResources();
67        mViewSize = res.getDimensionPixelOffset(R.dimen.datepicker_view_animator_height);
68        mChildSize = res.getDimensionPixelOffset(R.dimen.datepicker_year_label_height);
69
70        setVerticalFadingEdgeEnabled(true);
71        setFadingEdgeLength(mChildSize / 3);
72
73        final int paddingTop = res.getDimensionPixelSize(
74                R.dimen.datepicker_year_picker_padding_top);
75        setPadding(0, paddingTop, 0, 0);
76
77        setOnItemClickListener(this);
78        setDividerHeight(0);
79
80        mAdapter = new YearAdapter(getContext(), R.layout.year_label_text_view);
81        setAdapter(mAdapter);
82    }
83
84    public void setRange(Calendar min, Calendar max) {
85        mMinDate.setTimeInMillis(min.getTimeInMillis());
86        mMaxDate.setTimeInMillis(max.getTimeInMillis());
87
88        updateAdapterData();
89    }
90
91    public void init(DatePickerController controller) {
92        mController = controller;
93        mController.registerOnDateChangedListener(this);
94
95        updateAdapterData();
96
97        onDateChanged();
98    }
99
100    public void setYearSelectedCircleColor(int color) {
101        if (color != mYearSelectedCircleColor) {
102            mYearSelectedCircleColor = color;
103        }
104        requestLayout();
105    }
106
107    public int getYearSelectedCircleColor()  {
108        return mYearSelectedCircleColor;
109    }
110
111    private void updateAdapterData() {
112        mAdapter.clear();
113
114        final int maxYear = mMaxDate.get(Calendar.YEAR);
115        for (int year = mMinDate.get(Calendar.YEAR); year <= maxYear; year++) {
116            mAdapter.add(year);
117        }
118    }
119
120    @Override
121    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
122        mController.tryVibrate();
123        if (position != mSelectedPosition) {
124            mSelectedPosition = position;
125            mAdapter.notifyDataSetChanged();
126        }
127        mController.onYearSelected(mAdapter.getItem(position));
128    }
129
130    void setItemTextAppearance(int resId) {
131        mAdapter.setItemTextAppearance(resId);
132    }
133
134    private class YearAdapter extends ArrayAdapter<Integer> {
135        int mItemTextAppearanceResId;
136
137        public YearAdapter(Context context, int resource) {
138            super(context, resource);
139        }
140
141        @Override
142        public View getView(int position, View convertView, ViewGroup parent) {
143            TextViewWithCircularIndicator v = (TextViewWithCircularIndicator)
144                    super.getView(position, convertView, parent);
145            v.setTextAppearance(getContext(), mItemTextAppearanceResId);
146            v.requestLayout();
147            int year = getItem(position);
148            boolean selected = mController.getSelectedDay().get(Calendar.YEAR) == year;
149            v.setDrawIndicator(selected);
150            if (selected) {
151                v.setCircleColor(mYearSelectedCircleColor);
152            }
153            return v;
154        }
155
156        public void setItemTextAppearance(int resId) {
157            mItemTextAppearanceResId = resId;
158        }
159    }
160
161    public void postSetSelectionCentered(final int position) {
162        postSetSelectionFromTop(position, mViewSize / 2 - mChildSize / 2);
163    }
164
165    public void postSetSelectionFromTop(final int position, final int offset) {
166        post(new Runnable() {
167
168            @Override
169            public void run() {
170                setSelectionFromTop(position, offset);
171                requestLayout();
172            }
173        });
174    }
175
176    public int getFirstPositionOffset() {
177        final View firstChild = getChildAt(0);
178        if (firstChild == null) {
179            return 0;
180        }
181        return firstChild.getTop();
182    }
183
184    @Override
185    public void onDateChanged() {
186        updateAdapterData();
187        mAdapter.notifyDataSetChanged();
188        postSetSelectionCentered(
189                mController.getSelectedDay().get(Calendar.YEAR) - mMinDate.get(Calendar.YEAR));
190    }
191
192    @Override
193    public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
194        super.onInitializeAccessibilityEvent(event);
195
196        if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
197            event.setFromIndex(0);
198            event.setToIndex(0);
199        }
200    }
201}