YearPickerView.java revision 4e5168fae43e783a35c5bc731e500196005268fb 
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.ColorStateList;
21import android.content.res.Resources;
22import android.util.AttributeSet;
23import android.util.StateSet;
24import android.view.View;
25import android.view.ViewGroup;
26import android.view.accessibility.AccessibilityEvent;
27
28import java.util.Calendar;
29
30import com.android.internal.R;
31
32/**
33 * Displays a selectable list of years.
34 */
35class YearPickerView extends ListView implements AdapterView.OnItemClickListener,
36        OnDateChangedListener {
37    private final Calendar mMinDate = Calendar.getInstance();
38    private final Calendar mMaxDate = Calendar.getInstance();
39
40    private final YearAdapter mAdapter;
41    private final int mViewSize;
42    private final int mChildSize;
43
44    private DatePickerController mController;
45
46    private int mSelectedPosition = -1;
47    private int mYearActivatedColor;
48
49    public YearPickerView(Context context) {
50        this(context, null);
51    }
52
53    public YearPickerView(Context context, AttributeSet attrs) {
54        this(context, attrs, R.attr.listViewStyle);
55    }
56
57    public YearPickerView(Context context, AttributeSet attrs, int defStyleAttr) {
58        this(context, attrs, defStyleAttr, 0);
59    }
60
61    public YearPickerView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
62        super(context, attrs, defStyleAttr, defStyleRes);
63
64        final LayoutParams frame = new LayoutParams(
65                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
66        setLayoutParams(frame);
67
68        final Resources res = context.getResources();
69        mViewSize = res.getDimensionPixelOffset(R.dimen.datepicker_view_animator_height);
70        mChildSize = res.getDimensionPixelOffset(R.dimen.datepicker_year_label_height);
71
72        setVerticalFadingEdgeEnabled(true);
73        setFadingEdgeLength(mChildSize / 3);
74
75        final int paddingTop = res.getDimensionPixelSize(
76                R.dimen.datepicker_year_picker_padding_top);
77        setPadding(0, paddingTop, 0, 0);
78
79        setOnItemClickListener(this);
80        setDividerHeight(0);
81
82        mAdapter = new YearAdapter(getContext(), R.layout.year_label_text_view);
83        setAdapter(mAdapter);
84    }
85
86    public void setRange(Calendar min, Calendar max) {
87        mMinDate.setTimeInMillis(min.getTimeInMillis());
88        mMaxDate.setTimeInMillis(max.getTimeInMillis());
89
90        updateAdapterData();
91    }
92
93    public void init(DatePickerController controller) {
94        mController = controller;
95        mController.registerOnDateChangedListener(this);
96
97        updateAdapterData();
98
99        onDateChanged();
100    }
101
102    public void setYearBackgroundColor(ColorStateList yearBackgroundColor) {
103        mYearActivatedColor = yearBackgroundColor.getColorForState(
104                StateSet.get(StateSet.VIEW_STATE_ENABLED | StateSet.VIEW_STATE_ACTIVATED), 0);
105        invalidate();
106    }
107
108    public void setYearTextAppearance(int resId) {
109        mAdapter.setItemTextAppearance(resId);
110    }
111
112    private void updateAdapterData() {
113        mAdapter.clear();
114
115        final int maxYear = mMaxDate.get(Calendar.YEAR);
116        for (int year = mMinDate.get(Calendar.YEAR); year <= maxYear; year++) {
117            mAdapter.add(year);
118        }
119    }
120
121    @Override
122    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
123        mController.tryVibrate();
124        if (position != mSelectedPosition) {
125            mSelectedPosition = position;
126            mAdapter.notifyDataSetChanged();
127        }
128        mController.onYearSelected(mAdapter.getItem(position));
129    }
130
131    private class YearAdapter extends ArrayAdapter<Integer> {
132        private int mItemTextAppearanceResId;
133
134        public YearAdapter(Context context, int resource) {
135            super(context, resource);
136        }
137
138        @Override
139        public View getView(int position, View convertView, ViewGroup parent) {
140            final TextViewWithCircularIndicator v = (TextViewWithCircularIndicator)
141                    super.getView(position, convertView, parent);
142            v.setTextAppearance(v.getContext(), mItemTextAppearanceResId);
143            v.setCircleColor(mYearActivatedColor);
144
145            final int year = getItem(position);
146            final boolean selected = mController.getSelectedDay().get(Calendar.YEAR) == year;
147            v.setActivated(selected);
148
149            return v;
150        }
151
152        public void setItemTextAppearance(int resId) {
153            mItemTextAppearanceResId = resId;
154        }
155    }
156
157    public void postSetSelectionCentered(final int position) {
158        postSetSelectionFromTop(position, mViewSize / 2 - mChildSize / 2);
159    }
160
161    public void postSetSelectionFromTop(final int position, final int offset) {
162        post(new Runnable() {
163
164            @Override
165            public void run() {
166                setSelectionFromTop(position, offset);
167                requestLayout();
168            }
169        });
170    }
171
172    public int getFirstPositionOffset() {
173        final View firstChild = getChildAt(0);
174        if (firstChild == null) {
175            return 0;
176        }
177        return firstChild.getTop();
178    }
179
180    @Override
181    public void onDateChanged() {
182        updateAdapterData();
183        mAdapter.notifyDataSetChanged();
184        postSetSelectionCentered(
185                mController.getSelectedDay().get(Calendar.YEAR) - mMinDate.get(Calendar.YEAR));
186    }
187
188    /** @hide */
189    @Override
190    public void onInitializeAccessibilityEventInternal(AccessibilityEvent event) {
191        super.onInitializeAccessibilityEventInternal(event);
192
193        if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
194            event.setFromIndex(0);
195            event.setToIndex(0);
196        }
197    }
198}