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 com.android.internal.R;
20
21import android.app.Service;
22import android.content.Context;
23import android.content.res.Configuration;
24import android.content.res.TypedArray;
25import android.database.DataSetObserver;
26import android.graphics.Canvas;
27import android.graphics.Paint;
28import android.graphics.Rect;
29import android.graphics.drawable.Drawable;
30import android.icu.util.Calendar;
31import android.text.format.DateUtils;
32import android.util.AttributeSet;
33import android.util.DisplayMetrics;
34import android.util.TypedValue;
35import android.view.GestureDetector;
36import android.view.LayoutInflater;
37import android.view.MotionEvent;
38import android.view.View;
39import android.view.ViewGroup;
40
41import java.util.Locale;
42
43import libcore.icu.LocaleData;
44
45/**
46 * A delegate implementing the legacy CalendarView
47 */
48class CalendarViewLegacyDelegate extends CalendarView.AbstractCalendarViewDelegate {
49    /**
50     * Default value whether to show week number.
51     */
52    private static final boolean DEFAULT_SHOW_WEEK_NUMBER = true;
53
54    /**
55     * The number of milliseconds in a day.e
56     */
57    private static final long MILLIS_IN_DAY = 86400000L;
58
59    /**
60     * The number of day in a week.
61     */
62    private static final int DAYS_PER_WEEK = 7;
63
64    /**
65     * The number of milliseconds in a week.
66     */
67    private static final long MILLIS_IN_WEEK = DAYS_PER_WEEK * MILLIS_IN_DAY;
68
69    /**
70     * Affects when the month selection will change while scrolling upe
71     */
72    private static final int SCROLL_HYST_WEEKS = 2;
73
74    /**
75     * How long the GoTo fling animation should last.
76     */
77    private static final int GOTO_SCROLL_DURATION = 1000;
78
79    /**
80     * The duration of the adjustment upon a user scroll in milliseconds.
81     */
82    private static final int ADJUSTMENT_SCROLL_DURATION = 500;
83
84    /**
85     * How long to wait after receiving an onScrollStateChanged notification
86     * before acting on it.
87     */
88    private static final int SCROLL_CHANGE_DELAY = 40;
89
90    private static final int DEFAULT_SHOWN_WEEK_COUNT = 6;
91
92    private static final int DEFAULT_DATE_TEXT_SIZE = 14;
93
94    private static final int UNSCALED_SELECTED_DATE_VERTICAL_BAR_WIDTH = 6;
95
96    private static final int UNSCALED_WEEK_MIN_VISIBLE_HEIGHT = 12;
97
98    private static final int UNSCALED_LIST_SCROLL_TOP_OFFSET = 2;
99
100    private static final int UNSCALED_BOTTOM_BUFFER = 20;
101
102    private static final int UNSCALED_WEEK_SEPARATOR_LINE_WIDTH = 1;
103
104    private static final int DEFAULT_WEEK_DAY_TEXT_APPEARANCE_RES_ID = -1;
105
106    private final int mWeekSeperatorLineWidth;
107
108    private int mDateTextSize;
109
110    private Drawable mSelectedDateVerticalBar;
111
112    private final int mSelectedDateVerticalBarWidth;
113
114    private int mSelectedWeekBackgroundColor;
115
116    private int mFocusedMonthDateColor;
117
118    private int mUnfocusedMonthDateColor;
119
120    private int mWeekSeparatorLineColor;
121
122    private int mWeekNumberColor;
123
124    private int mWeekDayTextAppearanceResId;
125
126    private int mDateTextAppearanceResId;
127
128    /**
129     * The top offset of the weeks list.
130     */
131    private int mListScrollTopOffset = 2;
132
133    /**
134     * The visible height of a week view.
135     */
136    private int mWeekMinVisibleHeight = 12;
137
138    /**
139     * The visible height of a week view.
140     */
141    private int mBottomBuffer = 20;
142
143    /**
144     * The number of shown weeks.
145     */
146    private int mShownWeekCount;
147
148    /**
149     * Flag whether to show the week number.
150     */
151    private boolean mShowWeekNumber;
152
153    /**
154     * The number of day per week to be shown.
155     */
156    private int mDaysPerWeek = 7;
157
158    /**
159     * The friction of the week list while flinging.
160     */
161    private float mFriction = .05f;
162
163    /**
164     * Scale for adjusting velocity of the week list while flinging.
165     */
166    private float mVelocityScale = 0.333f;
167
168    /**
169     * The adapter for the weeks list.
170     */
171    private WeeksAdapter mAdapter;
172
173    /**
174     * The weeks list.
175     */
176    private ListView mListView;
177
178    /**
179     * The name of the month to display.
180     */
181    private TextView mMonthName;
182
183    /**
184     * The header with week day names.
185     */
186    private ViewGroup mDayNamesHeader;
187
188    /**
189     * Cached abbreviations for day of week names.
190     */
191    private String[] mDayNamesShort;
192
193    /**
194     * Cached full-length day of week names.
195     */
196    private String[] mDayNamesLong;
197
198    /**
199     * The first day of the week.
200     */
201    private int mFirstDayOfWeek;
202
203    /**
204     * Which month should be displayed/highlighted [0-11].
205     */
206    private int mCurrentMonthDisplayed = -1;
207
208    /**
209     * Used for tracking during a scroll.
210     */
211    private long mPreviousScrollPosition;
212
213    /**
214     * Used for tracking which direction the view is scrolling.
215     */
216    private boolean mIsScrollingUp = false;
217
218    /**
219     * The previous scroll state of the weeks ListView.
220     */
221    private int mPreviousScrollState = AbsListView.OnScrollListener.SCROLL_STATE_IDLE;
222
223    /**
224     * The current scroll state of the weeks ListView.
225     */
226    private int mCurrentScrollState = AbsListView.OnScrollListener.SCROLL_STATE_IDLE;
227
228    /**
229     * Listener for changes in the selected day.
230     */
231    private CalendarView.OnDateChangeListener mOnDateChangeListener;
232
233    /**
234     * Command for adjusting the position after a scroll/fling.
235     */
236    private ScrollStateRunnable mScrollStateChangedRunnable = new ScrollStateRunnable();
237
238    /**
239     * Temporary instance to avoid multiple instantiations.
240     */
241    private Calendar mTempDate;
242
243    /**
244     * The first day of the focused month.
245     */
246    private Calendar mFirstDayOfMonth;
247
248    /**
249     * The start date of the range supported by this picker.
250     */
251    private Calendar mMinDate;
252
253    /**
254     * The end date of the range supported by this picker.
255     */
256    private Calendar mMaxDate;
257
258    CalendarViewLegacyDelegate(CalendarView delegator, Context context, AttributeSet attrs,
259            int defStyleAttr, int defStyleRes) {
260        super(delegator, context);
261
262        final TypedArray a = context.obtainStyledAttributes(attrs,
263                R.styleable.CalendarView, defStyleAttr, defStyleRes);
264        mShowWeekNumber = a.getBoolean(R.styleable.CalendarView_showWeekNumber,
265                DEFAULT_SHOW_WEEK_NUMBER);
266        mFirstDayOfWeek = a.getInt(R.styleable.CalendarView_firstDayOfWeek,
267                LocaleData.get(Locale.getDefault()).firstDayOfWeek);
268        final String minDate = a.getString(R.styleable.CalendarView_minDate);
269        if (!CalendarView.parseDate(minDate, mMinDate)) {
270            CalendarView.parseDate(DEFAULT_MIN_DATE, mMinDate);
271        }
272        final String maxDate = a.getString(R.styleable.CalendarView_maxDate);
273        if (!CalendarView.parseDate(maxDate, mMaxDate)) {
274            CalendarView.parseDate(DEFAULT_MAX_DATE, mMaxDate);
275        }
276        if (mMaxDate.before(mMinDate)) {
277            throw new IllegalArgumentException("Max date cannot be before min date.");
278        }
279        mShownWeekCount = a.getInt(R.styleable.CalendarView_shownWeekCount,
280                DEFAULT_SHOWN_WEEK_COUNT);
281        mSelectedWeekBackgroundColor = a.getColor(
282                R.styleable.CalendarView_selectedWeekBackgroundColor, 0);
283        mFocusedMonthDateColor = a.getColor(
284                R.styleable.CalendarView_focusedMonthDateColor, 0);
285        mUnfocusedMonthDateColor = a.getColor(
286                R.styleable.CalendarView_unfocusedMonthDateColor, 0);
287        mWeekSeparatorLineColor = a.getColor(
288                R.styleable.CalendarView_weekSeparatorLineColor, 0);
289        mWeekNumberColor = a.getColor(R.styleable.CalendarView_weekNumberColor, 0);
290        mSelectedDateVerticalBar = a.getDrawable(
291                R.styleable.CalendarView_selectedDateVerticalBar);
292
293        mDateTextAppearanceResId = a.getResourceId(
294                R.styleable.CalendarView_dateTextAppearance, R.style.TextAppearance_Small);
295        updateDateTextSize();
296
297        mWeekDayTextAppearanceResId = a.getResourceId(
298                R.styleable.CalendarView_weekDayTextAppearance,
299                DEFAULT_WEEK_DAY_TEXT_APPEARANCE_RES_ID);
300        a.recycle();
301
302        DisplayMetrics displayMetrics = mDelegator.getResources().getDisplayMetrics();
303        mWeekMinVisibleHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
304                UNSCALED_WEEK_MIN_VISIBLE_HEIGHT, displayMetrics);
305        mListScrollTopOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
306                UNSCALED_LIST_SCROLL_TOP_OFFSET, displayMetrics);
307        mBottomBuffer = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
308                UNSCALED_BOTTOM_BUFFER, displayMetrics);
309        mSelectedDateVerticalBarWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
310                UNSCALED_SELECTED_DATE_VERTICAL_BAR_WIDTH, displayMetrics);
311        mWeekSeperatorLineWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
312                UNSCALED_WEEK_SEPARATOR_LINE_WIDTH, displayMetrics);
313
314        LayoutInflater layoutInflater = (LayoutInflater) mContext
315                .getSystemService(Service.LAYOUT_INFLATER_SERVICE);
316        View content = layoutInflater.inflate(R.layout.calendar_view, null, false);
317        mDelegator.addView(content);
318
319        mListView = (ListView) mDelegator.findViewById(R.id.list);
320        mDayNamesHeader = (ViewGroup) content.findViewById(R.id.day_names);
321        mMonthName = (TextView) content.findViewById(R.id.month_name);
322
323        setUpHeader();
324        setUpListView();
325        setUpAdapter();
326
327        // go to today or whichever is close to today min or max date
328        mTempDate.setTimeInMillis(System.currentTimeMillis());
329        if (mTempDate.before(mMinDate)) {
330            goTo(mMinDate, false, true, true);
331        } else if (mMaxDate.before(mTempDate)) {
332            goTo(mMaxDate, false, true, true);
333        } else {
334            goTo(mTempDate, false, true, true);
335        }
336
337        mDelegator.invalidate();
338    }
339
340    @Override
341    public void setShownWeekCount(int count) {
342        if (mShownWeekCount != count) {
343            mShownWeekCount = count;
344            mDelegator.invalidate();
345        }
346    }
347
348    @Override
349    public int getShownWeekCount() {
350        return mShownWeekCount;
351    }
352
353    @Override
354    public void setSelectedWeekBackgroundColor(int color) {
355        if (mSelectedWeekBackgroundColor != color) {
356            mSelectedWeekBackgroundColor = color;
357            final int childCount = mListView.getChildCount();
358            for (int i = 0; i < childCount; i++) {
359                WeekView weekView = (WeekView) mListView.getChildAt(i);
360                if (weekView.mHasSelectedDay) {
361                    weekView.invalidate();
362                }
363            }
364        }
365    }
366
367    @Override
368    public int getSelectedWeekBackgroundColor() {
369        return mSelectedWeekBackgroundColor;
370    }
371
372    @Override
373    public void setFocusedMonthDateColor(int color) {
374        if (mFocusedMonthDateColor != color) {
375            mFocusedMonthDateColor = color;
376            final int childCount = mListView.getChildCount();
377            for (int i = 0; i < childCount; i++) {
378                WeekView weekView = (WeekView) mListView.getChildAt(i);
379                if (weekView.mHasFocusedDay) {
380                    weekView.invalidate();
381                }
382            }
383        }
384    }
385
386    @Override
387    public int getFocusedMonthDateColor() {
388        return mFocusedMonthDateColor;
389    }
390
391    @Override
392    public void setUnfocusedMonthDateColor(int color) {
393        if (mUnfocusedMonthDateColor != color) {
394            mUnfocusedMonthDateColor = color;
395            final int childCount = mListView.getChildCount();
396            for (int i = 0; i < childCount; i++) {
397                WeekView weekView = (WeekView) mListView.getChildAt(i);
398                if (weekView.mHasUnfocusedDay) {
399                    weekView.invalidate();
400                }
401            }
402        }
403    }
404
405    @Override
406    public int getUnfocusedMonthDateColor() {
407        return mUnfocusedMonthDateColor;
408    }
409
410    @Override
411    public void setWeekNumberColor(int color) {
412        if (mWeekNumberColor != color) {
413            mWeekNumberColor = color;
414            if (mShowWeekNumber) {
415                invalidateAllWeekViews();
416            }
417        }
418    }
419
420    @Override
421    public int getWeekNumberColor() {
422        return mWeekNumberColor;
423    }
424
425    @Override
426    public void setWeekSeparatorLineColor(int color) {
427        if (mWeekSeparatorLineColor != color) {
428            mWeekSeparatorLineColor = color;
429            invalidateAllWeekViews();
430        }
431    }
432
433    @Override
434    public int getWeekSeparatorLineColor() {
435        return mWeekSeparatorLineColor;
436    }
437
438    @Override
439    public void setSelectedDateVerticalBar(int resourceId) {
440        Drawable drawable = mDelegator.getContext().getDrawable(resourceId);
441        setSelectedDateVerticalBar(drawable);
442    }
443
444    @Override
445    public void setSelectedDateVerticalBar(Drawable drawable) {
446        if (mSelectedDateVerticalBar != drawable) {
447            mSelectedDateVerticalBar = drawable;
448            final int childCount = mListView.getChildCount();
449            for (int i = 0; i < childCount; i++) {
450                WeekView weekView = (WeekView) mListView.getChildAt(i);
451                if (weekView.mHasSelectedDay) {
452                    weekView.invalidate();
453                }
454            }
455        }
456    }
457
458    @Override
459    public Drawable getSelectedDateVerticalBar() {
460        return mSelectedDateVerticalBar;
461    }
462
463    @Override
464    public void setWeekDayTextAppearance(int resourceId) {
465        if (mWeekDayTextAppearanceResId != resourceId) {
466            mWeekDayTextAppearanceResId = resourceId;
467            setUpHeader();
468        }
469    }
470
471    @Override
472    public int getWeekDayTextAppearance() {
473        return mWeekDayTextAppearanceResId;
474    }
475
476    @Override
477    public void setDateTextAppearance(int resourceId) {
478        if (mDateTextAppearanceResId != resourceId) {
479            mDateTextAppearanceResId = resourceId;
480            updateDateTextSize();
481            invalidateAllWeekViews();
482        }
483    }
484
485    @Override
486    public int getDateTextAppearance() {
487        return mDateTextAppearanceResId;
488    }
489
490    @Override
491    public void setMinDate(long minDate) {
492        mTempDate.setTimeInMillis(minDate);
493        if (isSameDate(mTempDate, mMinDate)) {
494            return;
495        }
496        mMinDate.setTimeInMillis(minDate);
497        // make sure the current date is not earlier than
498        // the new min date since the latter is used for
499        // calculating the indices in the adapter thus
500        // avoiding out of bounds error
501        Calendar date = mAdapter.mSelectedDate;
502        if (date.before(mMinDate)) {
503            mAdapter.setSelectedDay(mMinDate);
504        }
505        // reinitialize the adapter since its range depends on min date
506        mAdapter.init();
507        if (date.before(mMinDate)) {
508            setDate(mTempDate.getTimeInMillis());
509        } else {
510            // we go to the current date to force the ListView to query its
511            // adapter for the shown views since we have changed the adapter
512            // range and the base from which the later calculates item indices
513            // note that calling setDate will not work since the date is the same
514            goTo(date, false, true, false);
515        }
516    }
517
518    @Override
519    public long getMinDate() {
520        return mMinDate.getTimeInMillis();
521    }
522
523    @Override
524    public void setMaxDate(long maxDate) {
525        mTempDate.setTimeInMillis(maxDate);
526        if (isSameDate(mTempDate, mMaxDate)) {
527            return;
528        }
529        mMaxDate.setTimeInMillis(maxDate);
530        // reinitialize the adapter since its range depends on max date
531        mAdapter.init();
532        Calendar date = mAdapter.mSelectedDate;
533        if (date.after(mMaxDate)) {
534            setDate(mMaxDate.getTimeInMillis());
535        } else {
536            // we go to the current date to force the ListView to query its
537            // adapter for the shown views since we have changed the adapter
538            // range and the base from which the later calculates item indices
539            // note that calling setDate will not work since the date is the same
540            goTo(date, false, true, false);
541        }
542    }
543
544    @Override
545    public long getMaxDate() {
546        return mMaxDate.getTimeInMillis();
547    }
548
549    @Override
550    public void setShowWeekNumber(boolean showWeekNumber) {
551        if (mShowWeekNumber == showWeekNumber) {
552            return;
553        }
554        mShowWeekNumber = showWeekNumber;
555        mAdapter.notifyDataSetChanged();
556        setUpHeader();
557    }
558
559    @Override
560    public boolean getShowWeekNumber() {
561        return mShowWeekNumber;
562    }
563
564    @Override
565    public void setFirstDayOfWeek(int firstDayOfWeek) {
566        if (mFirstDayOfWeek == firstDayOfWeek) {
567            return;
568        }
569        mFirstDayOfWeek = firstDayOfWeek;
570        mAdapter.init();
571        mAdapter.notifyDataSetChanged();
572        setUpHeader();
573    }
574
575    @Override
576    public int getFirstDayOfWeek() {
577        return mFirstDayOfWeek;
578    }
579
580    @Override
581    public void setDate(long date) {
582        setDate(date, false, false);
583    }
584
585    @Override
586    public void setDate(long date, boolean animate, boolean center) {
587        mTempDate.setTimeInMillis(date);
588        if (isSameDate(mTempDate, mAdapter.mSelectedDate)) {
589            return;
590        }
591        goTo(mTempDate, animate, true, center);
592    }
593
594    @Override
595    public long getDate() {
596        return mAdapter.mSelectedDate.getTimeInMillis();
597    }
598
599    @Override
600    public void setOnDateChangeListener(CalendarView.OnDateChangeListener listener) {
601        mOnDateChangeListener = listener;
602    }
603
604    @Override
605    public void onConfigurationChanged(Configuration newConfig) {
606        setCurrentLocale(newConfig.locale);
607    }
608
609    /**
610     * Sets the current locale.
611     *
612     * @param locale The current locale.
613     */
614    @Override
615    protected void setCurrentLocale(Locale locale) {
616        super.setCurrentLocale(locale);
617
618        mTempDate = getCalendarForLocale(mTempDate, locale);
619        mFirstDayOfMonth = getCalendarForLocale(mFirstDayOfMonth, locale);
620        mMinDate = getCalendarForLocale(mMinDate, locale);
621        mMaxDate = getCalendarForLocale(mMaxDate, locale);
622    }
623    private void updateDateTextSize() {
624        TypedArray dateTextAppearance = mDelegator.getContext().obtainStyledAttributes(
625                mDateTextAppearanceResId, R.styleable.TextAppearance);
626        mDateTextSize = dateTextAppearance.getDimensionPixelSize(
627                R.styleable.TextAppearance_textSize, DEFAULT_DATE_TEXT_SIZE);
628        dateTextAppearance.recycle();
629    }
630
631    /**
632     * Invalidates all week views.
633     */
634    private void invalidateAllWeekViews() {
635        final int childCount = mListView.getChildCount();
636        for (int i = 0; i < childCount; i++) {
637            View view = mListView.getChildAt(i);
638            view.invalidate();
639        }
640    }
641
642    /**
643     * Gets a calendar for locale bootstrapped with the value of a given calendar.
644     *
645     * @param oldCalendar The old calendar.
646     * @param locale The locale.
647     */
648    private static Calendar getCalendarForLocale(Calendar oldCalendar, Locale locale) {
649        if (oldCalendar == null) {
650            return Calendar.getInstance(locale);
651        } else {
652            final long currentTimeMillis = oldCalendar.getTimeInMillis();
653            Calendar newCalendar = Calendar.getInstance(locale);
654            newCalendar.setTimeInMillis(currentTimeMillis);
655            return newCalendar;
656        }
657    }
658
659    /**
660     * @return True if the <code>firstDate</code> is the same as the <code>
661     * secondDate</code>.
662     */
663    private static boolean isSameDate(Calendar firstDate, Calendar secondDate) {
664        return (firstDate.get(Calendar.DAY_OF_YEAR) == secondDate.get(Calendar.DAY_OF_YEAR)
665                && firstDate.get(Calendar.YEAR) == secondDate.get(Calendar.YEAR));
666    }
667
668    /**
669     * Creates a new adapter if necessary and sets up its parameters.
670     */
671    private void setUpAdapter() {
672        if (mAdapter == null) {
673            mAdapter = new WeeksAdapter(mContext);
674            mAdapter.registerDataSetObserver(new DataSetObserver() {
675                @Override
676                public void onChanged() {
677                    if (mOnDateChangeListener != null) {
678                        Calendar selectedDay = mAdapter.getSelectedDay();
679                        mOnDateChangeListener.onSelectedDayChange(mDelegator,
680                                selectedDay.get(Calendar.YEAR),
681                                selectedDay.get(Calendar.MONTH),
682                                selectedDay.get(Calendar.DAY_OF_MONTH));
683                    }
684                }
685            });
686            mListView.setAdapter(mAdapter);
687        }
688
689        // refresh the view with the new parameters
690        mAdapter.notifyDataSetChanged();
691    }
692
693    /**
694     * Sets up the strings to be used by the header.
695     */
696    private void setUpHeader() {
697        mDayNamesShort = new String[mDaysPerWeek];
698        mDayNamesLong = new String[mDaysPerWeek];
699        for (int i = mFirstDayOfWeek, count = mFirstDayOfWeek + mDaysPerWeek; i < count; i++) {
700            int calendarDay = (i > Calendar.SATURDAY) ? i - Calendar.SATURDAY : i;
701            mDayNamesShort[i - mFirstDayOfWeek] = DateUtils.getDayOfWeekString(calendarDay,
702                    DateUtils.LENGTH_SHORTEST);
703            mDayNamesLong[i - mFirstDayOfWeek] = DateUtils.getDayOfWeekString(calendarDay,
704                    DateUtils.LENGTH_LONG);
705        }
706
707        TextView label = (TextView) mDayNamesHeader.getChildAt(0);
708        if (mShowWeekNumber) {
709            label.setVisibility(View.VISIBLE);
710        } else {
711            label.setVisibility(View.GONE);
712        }
713        for (int i = 1, count = mDayNamesHeader.getChildCount(); i < count; i++) {
714            label = (TextView) mDayNamesHeader.getChildAt(i);
715            if (mWeekDayTextAppearanceResId > -1) {
716                label.setTextAppearance(mWeekDayTextAppearanceResId);
717            }
718            if (i < mDaysPerWeek + 1) {
719                label.setText(mDayNamesShort[i - 1]);
720                label.setContentDescription(mDayNamesLong[i - 1]);
721                label.setVisibility(View.VISIBLE);
722            } else {
723                label.setVisibility(View.GONE);
724            }
725        }
726        mDayNamesHeader.invalidate();
727    }
728
729    /**
730     * Sets all the required fields for the list view.
731     */
732    private void setUpListView() {
733        // Configure the listview
734        mListView.setDivider(null);
735        mListView.setItemsCanFocus(true);
736        mListView.setVerticalScrollBarEnabled(false);
737        mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
738            public void onScrollStateChanged(AbsListView view, int scrollState) {
739                CalendarViewLegacyDelegate.this.onScrollStateChanged(view, scrollState);
740            }
741
742            public void onScroll(
743                    AbsListView view, int firstVisibleItem, int visibleItemCount,
744                    int totalItemCount) {
745                CalendarViewLegacyDelegate.this.onScroll(view, firstVisibleItem,
746                        visibleItemCount, totalItemCount);
747            }
748        });
749        // Make the scrolling behavior nicer
750        mListView.setFriction(mFriction);
751        mListView.setVelocityScale(mVelocityScale);
752    }
753
754    /**
755     * This moves to the specified time in the view. If the time is not already
756     * in range it will move the list so that the first of the month containing
757     * the time is at the top of the view. If the new time is already in view
758     * the list will not be scrolled unless forceScroll is true. This time may
759     * optionally be highlighted as selected as well.
760     *
761     * @param date The time to move to.
762     * @param animate Whether to scroll to the given time or just redraw at the
763     *            new location.
764     * @param setSelected Whether to set the given time as selected.
765     * @param forceScroll Whether to recenter even if the time is already
766     *            visible.
767     *
768     * @throws IllegalArgumentException of the provided date is before the
769     *        range start of after the range end.
770     */
771    private void goTo(Calendar date, boolean animate, boolean setSelected,
772            boolean forceScroll) {
773        if (date.before(mMinDate) || date.after(mMaxDate)) {
774            throw new IllegalArgumentException("Time not between " + mMinDate.getTime()
775                    + " and " + mMaxDate.getTime());
776        }
777        // Find the first and last entirely visible weeks
778        int firstFullyVisiblePosition = mListView.getFirstVisiblePosition();
779        View firstChild = mListView.getChildAt(0);
780        if (firstChild != null && firstChild.getTop() < 0) {
781            firstFullyVisiblePosition++;
782        }
783        int lastFullyVisiblePosition = firstFullyVisiblePosition + mShownWeekCount - 1;
784        if (firstChild != null && firstChild.getTop() > mBottomBuffer) {
785            lastFullyVisiblePosition--;
786        }
787        if (setSelected) {
788            mAdapter.setSelectedDay(date);
789        }
790        // Get the week we're going to
791        int position = getWeeksSinceMinDate(date);
792
793        // Check if the selected day is now outside of our visible range
794        // and if so scroll to the month that contains it
795        if (position < firstFullyVisiblePosition || position > lastFullyVisiblePosition
796                || forceScroll) {
797            mFirstDayOfMonth.setTimeInMillis(date.getTimeInMillis());
798            mFirstDayOfMonth.set(Calendar.DAY_OF_MONTH, 1);
799
800            setMonthDisplayed(mFirstDayOfMonth);
801
802            // the earliest time we can scroll to is the min date
803            if (mFirstDayOfMonth.before(mMinDate)) {
804                position = 0;
805            } else {
806                position = getWeeksSinceMinDate(mFirstDayOfMonth);
807            }
808
809            mPreviousScrollState = AbsListView.OnScrollListener.SCROLL_STATE_FLING;
810            if (animate) {
811                mListView.smoothScrollToPositionFromTop(position, mListScrollTopOffset,
812                        GOTO_SCROLL_DURATION);
813            } else {
814                mListView.setSelectionFromTop(position, mListScrollTopOffset);
815                // Perform any after scroll operations that are needed
816                onScrollStateChanged(mListView, AbsListView.OnScrollListener.SCROLL_STATE_IDLE);
817            }
818        } else if (setSelected) {
819            // Otherwise just set the selection
820            setMonthDisplayed(date);
821        }
822    }
823
824    /**
825     * Called when a <code>view</code> transitions to a new <code>scrollState
826     * </code>.
827     */
828    private void onScrollStateChanged(AbsListView view, int scrollState) {
829        mScrollStateChangedRunnable.doScrollStateChange(view, scrollState);
830    }
831
832    /**
833     * Updates the title and selected month if the <code>view</code> has moved to a new
834     * month.
835     */
836    private void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
837                          int totalItemCount) {
838        WeekView child = (WeekView) view.getChildAt(0);
839        if (child == null) {
840            return;
841        }
842
843        // Figure out where we are
844        long currScroll =
845                view.getFirstVisiblePosition() * child.getHeight() - child.getBottom();
846
847        // If we have moved since our last call update the direction
848        if (currScroll < mPreviousScrollPosition) {
849            mIsScrollingUp = true;
850        } else if (currScroll > mPreviousScrollPosition) {
851            mIsScrollingUp = false;
852        } else {
853            return;
854        }
855
856        // Use some hysteresis for checking which month to highlight. This
857        // causes the month to transition when two full weeks of a month are
858        // visible when scrolling up, and when the first day in a month reaches
859        // the top of the screen when scrolling down.
860        int offset = child.getBottom() < mWeekMinVisibleHeight ? 1 : 0;
861        if (mIsScrollingUp) {
862            child = (WeekView) view.getChildAt(SCROLL_HYST_WEEKS + offset);
863        } else if (offset != 0) {
864            child = (WeekView) view.getChildAt(offset);
865        }
866
867        if (child != null) {
868            // Find out which month we're moving into
869            int month;
870            if (mIsScrollingUp) {
871                month = child.getMonthOfFirstWeekDay();
872            } else {
873                month = child.getMonthOfLastWeekDay();
874            }
875
876            // And how it relates to our current highlighted month
877            int monthDiff;
878            if (mCurrentMonthDisplayed == 11 && month == 0) {
879                monthDiff = 1;
880            } else if (mCurrentMonthDisplayed == 0 && month == 11) {
881                monthDiff = -1;
882            } else {
883                monthDiff = month - mCurrentMonthDisplayed;
884            }
885
886            // Only switch months if we're scrolling away from the currently
887            // selected month
888            if ((!mIsScrollingUp && monthDiff > 0) || (mIsScrollingUp && monthDiff < 0)) {
889                Calendar firstDay = child.getFirstDay();
890                if (mIsScrollingUp) {
891                    firstDay.add(Calendar.DAY_OF_MONTH, -DAYS_PER_WEEK);
892                } else {
893                    firstDay.add(Calendar.DAY_OF_MONTH, DAYS_PER_WEEK);
894                }
895                setMonthDisplayed(firstDay);
896            }
897        }
898        mPreviousScrollPosition = currScroll;
899        mPreviousScrollState = mCurrentScrollState;
900    }
901
902    /**
903     * Sets the month displayed at the top of this view based on time. Override
904     * to add custom events when the title is changed.
905     *
906     * @param calendar A day in the new focus month.
907     */
908    private void setMonthDisplayed(Calendar calendar) {
909        mCurrentMonthDisplayed = calendar.get(Calendar.MONTH);
910        mAdapter.setFocusMonth(mCurrentMonthDisplayed);
911        final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_NO_MONTH_DAY
912                | DateUtils.FORMAT_SHOW_YEAR;
913        final long millis = calendar.getTimeInMillis();
914        String newMonthName = DateUtils.formatDateRange(mContext, millis, millis, flags);
915        mMonthName.setText(newMonthName);
916        mMonthName.invalidate();
917    }
918
919    /**
920     * @return Returns the number of weeks between the current <code>date</code>
921     *         and the <code>mMinDate</code>.
922     */
923    private int getWeeksSinceMinDate(Calendar date) {
924        if (date.before(mMinDate)) {
925            throw new IllegalArgumentException("fromDate: " + mMinDate.getTime()
926                    + " does not precede toDate: " + date.getTime());
927        }
928        long endTimeMillis = date.getTimeInMillis()
929                + date.getTimeZone().getOffset(date.getTimeInMillis());
930        long startTimeMillis = mMinDate.getTimeInMillis()
931                + mMinDate.getTimeZone().getOffset(mMinDate.getTimeInMillis());
932        long dayOffsetMillis = (mMinDate.get(Calendar.DAY_OF_WEEK) - mFirstDayOfWeek)
933                * MILLIS_IN_DAY;
934        return (int) ((endTimeMillis - startTimeMillis + dayOffsetMillis) / MILLIS_IN_WEEK);
935    }
936
937    /**
938     * Command responsible for acting upon scroll state changes.
939     */
940    private class ScrollStateRunnable implements Runnable {
941        private AbsListView mView;
942
943        private int mNewState;
944
945        /**
946         * Sets up the runnable with a short delay in case the scroll state
947         * immediately changes again.
948         *
949         * @param view The list view that changed state
950         * @param scrollState The new state it changed to
951         */
952        public void doScrollStateChange(AbsListView view, int scrollState) {
953            mView = view;
954            mNewState = scrollState;
955            mDelegator.removeCallbacks(this);
956            mDelegator.postDelayed(this, SCROLL_CHANGE_DELAY);
957        }
958
959        public void run() {
960            mCurrentScrollState = mNewState;
961            // Fix the position after a scroll or a fling ends
962            if (mNewState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE
963                    && mPreviousScrollState != AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
964                View child = mView.getChildAt(0);
965                if (child == null) {
966                    // The view is no longer visible, just return
967                    return;
968                }
969                int dist = child.getBottom() - mListScrollTopOffset;
970                if (dist > mListScrollTopOffset) {
971                    if (mIsScrollingUp) {
972                        mView.smoothScrollBy(dist - child.getHeight(),
973                                ADJUSTMENT_SCROLL_DURATION);
974                    } else {
975                        mView.smoothScrollBy(dist, ADJUSTMENT_SCROLL_DURATION);
976                    }
977                }
978            }
979            mPreviousScrollState = mNewState;
980        }
981    }
982
983    /**
984     * <p>
985     * This is a specialized adapter for creating a list of weeks with
986     * selectable days. It can be configured to display the week number, start
987     * the week on a given day, show a reduced number of days, or display an
988     * arbitrary number of weeks at a time.
989     * </p>
990     */
991    private class WeeksAdapter extends BaseAdapter implements View.OnTouchListener {
992
993        private int mSelectedWeek;
994
995        private GestureDetector mGestureDetector;
996
997        private int mFocusedMonth;
998
999        private final Calendar mSelectedDate = Calendar.getInstance();
1000
1001        private int mTotalWeekCount;
1002
1003        public WeeksAdapter(Context context) {
1004            mContext = context;
1005            mGestureDetector = new GestureDetector(mContext, new WeeksAdapter.CalendarGestureListener());
1006            init();
1007        }
1008
1009        /**
1010         * Set up the gesture detector and selected time
1011         */
1012        private void init() {
1013            mSelectedWeek = getWeeksSinceMinDate(mSelectedDate);
1014            mTotalWeekCount = getWeeksSinceMinDate(mMaxDate);
1015            if (mMinDate.get(Calendar.DAY_OF_WEEK) != mFirstDayOfWeek
1016                    || mMaxDate.get(Calendar.DAY_OF_WEEK) != mFirstDayOfWeek) {
1017                mTotalWeekCount++;
1018            }
1019            notifyDataSetChanged();
1020        }
1021
1022        /**
1023         * Updates the selected day and related parameters.
1024         *
1025         * @param selectedDay The time to highlight
1026         */
1027        public void setSelectedDay(Calendar selectedDay) {
1028            if (selectedDay.get(Calendar.DAY_OF_YEAR) == mSelectedDate.get(Calendar.DAY_OF_YEAR)
1029                    && selectedDay.get(Calendar.YEAR) == mSelectedDate.get(Calendar.YEAR)) {
1030                return;
1031            }
1032            mSelectedDate.setTimeInMillis(selectedDay.getTimeInMillis());
1033            mSelectedWeek = getWeeksSinceMinDate(mSelectedDate);
1034            mFocusedMonth = mSelectedDate.get(Calendar.MONTH);
1035            notifyDataSetChanged();
1036        }
1037
1038        /**
1039         * @return The selected day of month.
1040         */
1041        public Calendar getSelectedDay() {
1042            return mSelectedDate;
1043        }
1044
1045        @Override
1046        public int getCount() {
1047            return mTotalWeekCount;
1048        }
1049
1050        @Override
1051        public Object getItem(int position) {
1052            return null;
1053        }
1054
1055        @Override
1056        public long getItemId(int position) {
1057            return position;
1058        }
1059
1060        @Override
1061        public View getView(int position, View convertView, ViewGroup parent) {
1062            WeekView weekView = null;
1063            if (convertView != null) {
1064                weekView = (WeekView) convertView;
1065            } else {
1066                weekView = new WeekView(mContext);
1067                AbsListView.LayoutParams params =
1068                        new AbsListView.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT,
1069                                FrameLayout.LayoutParams.WRAP_CONTENT);
1070                weekView.setLayoutParams(params);
1071                weekView.setClickable(true);
1072                weekView.setOnTouchListener(this);
1073            }
1074
1075            int selectedWeekDay = (mSelectedWeek == position) ? mSelectedDate.get(
1076                    Calendar.DAY_OF_WEEK) : -1;
1077            weekView.init(position, selectedWeekDay, mFocusedMonth);
1078
1079            return weekView;
1080        }
1081
1082        /**
1083         * Changes which month is in focus and updates the view.
1084         *
1085         * @param month The month to show as in focus [0-11]
1086         */
1087        public void setFocusMonth(int month) {
1088            if (mFocusedMonth == month) {
1089                return;
1090            }
1091            mFocusedMonth = month;
1092            notifyDataSetChanged();
1093        }
1094
1095        @Override
1096        public boolean onTouch(View v, MotionEvent event) {
1097            if (mListView.isEnabled() && mGestureDetector.onTouchEvent(event)) {
1098                WeekView weekView = (WeekView) v;
1099                // if we cannot find a day for the given location we are done
1100                if (!weekView.getDayFromLocation(event.getX(), mTempDate)) {
1101                    return true;
1102                }
1103                // it is possible that the touched day is outside the valid range
1104                // we draw whole weeks but range end can fall not on the week end
1105                if (mTempDate.before(mMinDate) || mTempDate.after(mMaxDate)) {
1106                    return true;
1107                }
1108                onDateTapped(mTempDate);
1109                return true;
1110            }
1111            return false;
1112        }
1113
1114        /**
1115         * Maintains the same hour/min/sec but moves the day to the tapped day.
1116         *
1117         * @param day The day that was tapped
1118         */
1119        private void onDateTapped(Calendar day) {
1120            setSelectedDay(day);
1121            setMonthDisplayed(day);
1122        }
1123
1124        /**
1125         * This is here so we can identify single tap events and set the
1126         * selected day correctly
1127         */
1128        class CalendarGestureListener extends GestureDetector.SimpleOnGestureListener {
1129            @Override
1130            public boolean onSingleTapUp(MotionEvent e) {
1131                return true;
1132            }
1133        }
1134    }
1135
1136    /**
1137     * <p>
1138     * This is a dynamic view for drawing a single week. It can be configured to
1139     * display the week number, start the week on a given day, or show a reduced
1140     * number of days. It is intended for use as a single view within a
1141     * ListView. See {@link WeeksAdapter} for usage.
1142     * </p>
1143     */
1144    private class WeekView extends View {
1145
1146        private final Rect mTempRect = new Rect();
1147
1148        private final Paint mDrawPaint = new Paint();
1149
1150        private final Paint mMonthNumDrawPaint = new Paint();
1151
1152        // Cache the number strings so we don't have to recompute them each time
1153        private String[] mDayNumbers;
1154
1155        // Quick lookup for checking which days are in the focus month
1156        private boolean[] mFocusDay;
1157
1158        // Whether this view has a focused day.
1159        private boolean mHasFocusedDay;
1160
1161        // Whether this view has only focused days.
1162        private boolean mHasUnfocusedDay;
1163
1164        // The first day displayed by this item
1165        private Calendar mFirstDay;
1166
1167        // The month of the first day in this week
1168        private int mMonthOfFirstWeekDay = -1;
1169
1170        // The month of the last day in this week
1171        private int mLastWeekDayMonth = -1;
1172
1173        // The position of this week, equivalent to weeks since the week of Jan
1174        // 1st, 1900
1175        private int mWeek = -1;
1176
1177        // Quick reference to the width of this view, matches parent
1178        private int mWidth;
1179
1180        // The height this view should draw at in pixels, set by height param
1181        private int mHeight;
1182
1183        // If this view contains the selected day
1184        private boolean mHasSelectedDay = false;
1185
1186        // Which day is selected [0-6] or -1 if no day is selected
1187        private int mSelectedDay = -1;
1188
1189        // The number of days + a spot for week number if it is displayed
1190        private int mNumCells;
1191
1192        // The left edge of the selected day
1193        private int mSelectedLeft = -1;
1194
1195        // The right edge of the selected day
1196        private int mSelectedRight = -1;
1197
1198        public WeekView(Context context) {
1199            super(context);
1200
1201            // Sets up any standard paints that will be used
1202            initilaizePaints();
1203        }
1204
1205        /**
1206         * Initializes this week view.
1207         *
1208         * @param weekNumber The number of the week this view represents. The
1209         *            week number is a zero based index of the weeks since
1210         *            {@link android.widget.CalendarView#getMinDate()}.
1211         * @param selectedWeekDay The selected day of the week from 0 to 6, -1 if no
1212         *            selected day.
1213         * @param focusedMonth The month that is currently in focus i.e.
1214         *            highlighted.
1215         */
1216        public void init(int weekNumber, int selectedWeekDay, int focusedMonth) {
1217            mSelectedDay = selectedWeekDay;
1218            mHasSelectedDay = mSelectedDay != -1;
1219            mNumCells = mShowWeekNumber ? mDaysPerWeek + 1 : mDaysPerWeek;
1220            mWeek = weekNumber;
1221            mTempDate.setTimeInMillis(mMinDate.getTimeInMillis());
1222
1223            mTempDate.add(Calendar.WEEK_OF_YEAR, mWeek);
1224            mTempDate.setFirstDayOfWeek(mFirstDayOfWeek);
1225
1226            // Allocate space for caching the day numbers and focus values
1227            mDayNumbers = new String[mNumCells];
1228            mFocusDay = new boolean[mNumCells];
1229
1230            // If we're showing the week number calculate it based on Monday
1231            int i = 0;
1232            if (mShowWeekNumber) {
1233                mDayNumbers[0] = String.format(Locale.getDefault(), "%d",
1234                        mTempDate.get(Calendar.WEEK_OF_YEAR));
1235                i++;
1236            }
1237
1238            // Now adjust our starting day based on the start day of the week
1239            int diff = mFirstDayOfWeek - mTempDate.get(Calendar.DAY_OF_WEEK);
1240            mTempDate.add(Calendar.DAY_OF_MONTH, diff);
1241
1242            mFirstDay = (Calendar) mTempDate.clone();
1243            mMonthOfFirstWeekDay = mTempDate.get(Calendar.MONTH);
1244
1245            mHasUnfocusedDay = true;
1246            for (; i < mNumCells; i++) {
1247                final boolean isFocusedDay = (mTempDate.get(Calendar.MONTH) == focusedMonth);
1248                mFocusDay[i] = isFocusedDay;
1249                mHasFocusedDay |= isFocusedDay;
1250                mHasUnfocusedDay &= !isFocusedDay;
1251                // do not draw dates outside the valid range to avoid user confusion
1252                if (mTempDate.before(mMinDate) || mTempDate.after(mMaxDate)) {
1253                    mDayNumbers[i] = "";
1254                } else {
1255                    mDayNumbers[i] = String.format(Locale.getDefault(), "%d",
1256                            mTempDate.get(Calendar.DAY_OF_MONTH));
1257                }
1258                mTempDate.add(Calendar.DAY_OF_MONTH, 1);
1259            }
1260            // We do one extra add at the end of the loop, if that pushed us to
1261            // new month undo it
1262            if (mTempDate.get(Calendar.DAY_OF_MONTH) == 1) {
1263                mTempDate.add(Calendar.DAY_OF_MONTH, -1);
1264            }
1265            mLastWeekDayMonth = mTempDate.get(Calendar.MONTH);
1266
1267            updateSelectionPositions();
1268        }
1269
1270        /**
1271         * Initialize the paint instances.
1272         */
1273        private void initilaizePaints() {
1274            mDrawPaint.setFakeBoldText(false);
1275            mDrawPaint.setAntiAlias(true);
1276            mDrawPaint.setStyle(Paint.Style.FILL);
1277
1278            mMonthNumDrawPaint.setFakeBoldText(true);
1279            mMonthNumDrawPaint.setAntiAlias(true);
1280            mMonthNumDrawPaint.setStyle(Paint.Style.FILL);
1281            mMonthNumDrawPaint.setTextAlign(Paint.Align.CENTER);
1282            mMonthNumDrawPaint.setTextSize(mDateTextSize);
1283        }
1284
1285        /**
1286         * Returns the month of the first day in this week.
1287         *
1288         * @return The month the first day of this view is in.
1289         */
1290        public int getMonthOfFirstWeekDay() {
1291            return mMonthOfFirstWeekDay;
1292        }
1293
1294        /**
1295         * Returns the month of the last day in this week
1296         *
1297         * @return The month the last day of this view is in
1298         */
1299        public int getMonthOfLastWeekDay() {
1300            return mLastWeekDayMonth;
1301        }
1302
1303        /**
1304         * Returns the first day in this view.
1305         *
1306         * @return The first day in the view.
1307         */
1308        public Calendar getFirstDay() {
1309            return mFirstDay;
1310        }
1311
1312        /**
1313         * Calculates the day that the given x position is in, accounting for
1314         * week number.
1315         *
1316         * @param x The x position of the touch event.
1317         * @return True if a day was found for the given location.
1318         */
1319        public boolean getDayFromLocation(float x, Calendar outCalendar) {
1320            final boolean isLayoutRtl = isLayoutRtl();
1321
1322            int start;
1323            int end;
1324
1325            if (isLayoutRtl) {
1326                start = 0;
1327                end = mShowWeekNumber ? mWidth - mWidth / mNumCells : mWidth;
1328            } else {
1329                start = mShowWeekNumber ? mWidth / mNumCells : 0;
1330                end = mWidth;
1331            }
1332
1333            if (x < start || x > end) {
1334                outCalendar.clear();
1335                return false;
1336            }
1337
1338            // Selection is (x - start) / (pixels/day) which is (x - start) * day / pixels
1339            int dayPosition = (int) ((x - start) * mDaysPerWeek / (end - start));
1340
1341            if (isLayoutRtl) {
1342                dayPosition = mDaysPerWeek - 1 - dayPosition;
1343            }
1344
1345            outCalendar.setTimeInMillis(mFirstDay.getTimeInMillis());
1346            outCalendar.add(Calendar.DAY_OF_MONTH, dayPosition);
1347
1348            return true;
1349        }
1350
1351        @Override
1352        protected void onDraw(Canvas canvas) {
1353            drawBackground(canvas);
1354            drawWeekNumbersAndDates(canvas);
1355            drawWeekSeparators(canvas);
1356            drawSelectedDateVerticalBars(canvas);
1357        }
1358
1359        /**
1360         * This draws the selection highlight if a day is selected in this week.
1361         *
1362         * @param canvas The canvas to draw on
1363         */
1364        private void drawBackground(Canvas canvas) {
1365            if (!mHasSelectedDay) {
1366                return;
1367            }
1368            mDrawPaint.setColor(mSelectedWeekBackgroundColor);
1369
1370            mTempRect.top = mWeekSeperatorLineWidth;
1371            mTempRect.bottom = mHeight;
1372
1373            final boolean isLayoutRtl = isLayoutRtl();
1374
1375            if (isLayoutRtl) {
1376                mTempRect.left = 0;
1377                mTempRect.right = mSelectedLeft - 2;
1378            } else {
1379                mTempRect.left = mShowWeekNumber ? mWidth / mNumCells : 0;
1380                mTempRect.right = mSelectedLeft - 2;
1381            }
1382            canvas.drawRect(mTempRect, mDrawPaint);
1383
1384            if (isLayoutRtl) {
1385                mTempRect.left = mSelectedRight + 3;
1386                mTempRect.right = mShowWeekNumber ? mWidth - mWidth / mNumCells : mWidth;
1387            } else {
1388                mTempRect.left = mSelectedRight + 3;
1389                mTempRect.right = mWidth;
1390            }
1391            canvas.drawRect(mTempRect, mDrawPaint);
1392        }
1393
1394        /**
1395         * Draws the week and month day numbers for this week.
1396         *
1397         * @param canvas The canvas to draw on
1398         */
1399        private void drawWeekNumbersAndDates(Canvas canvas) {
1400            final float textHeight = mDrawPaint.getTextSize();
1401            final int y = (int) ((mHeight + textHeight) / 2) - mWeekSeperatorLineWidth;
1402            final int nDays = mNumCells;
1403            final int divisor = 2 * nDays;
1404
1405            mDrawPaint.setTextAlign(Paint.Align.CENTER);
1406            mDrawPaint.setTextSize(mDateTextSize);
1407
1408            int i = 0;
1409
1410            if (isLayoutRtl()) {
1411                for (; i < nDays - 1; i++) {
1412                    mMonthNumDrawPaint.setColor(mFocusDay[i] ? mFocusedMonthDateColor
1413                            : mUnfocusedMonthDateColor);
1414                    int x = (2 * i + 1) * mWidth / divisor;
1415                    canvas.drawText(mDayNumbers[nDays - 1 - i], x, y, mMonthNumDrawPaint);
1416                }
1417                if (mShowWeekNumber) {
1418                    mDrawPaint.setColor(mWeekNumberColor);
1419                    int x = mWidth - mWidth / divisor;
1420                    canvas.drawText(mDayNumbers[0], x, y, mDrawPaint);
1421                }
1422            } else {
1423                if (mShowWeekNumber) {
1424                    mDrawPaint.setColor(mWeekNumberColor);
1425                    int x = mWidth / divisor;
1426                    canvas.drawText(mDayNumbers[0], x, y, mDrawPaint);
1427                    i++;
1428                }
1429                for (; i < nDays; i++) {
1430                    mMonthNumDrawPaint.setColor(mFocusDay[i] ? mFocusedMonthDateColor
1431                            : mUnfocusedMonthDateColor);
1432                    int x = (2 * i + 1) * mWidth / divisor;
1433                    canvas.drawText(mDayNumbers[i], x, y, mMonthNumDrawPaint);
1434                }
1435            }
1436        }
1437
1438        /**
1439         * Draws a horizontal line for separating the weeks.
1440         *
1441         * @param canvas The canvas to draw on.
1442         */
1443        private void drawWeekSeparators(Canvas canvas) {
1444            // If it is the topmost fully visible child do not draw separator line
1445            int firstFullyVisiblePosition = mListView.getFirstVisiblePosition();
1446            if (mListView.getChildAt(0).getTop() < 0) {
1447                firstFullyVisiblePosition++;
1448            }
1449            if (firstFullyVisiblePosition == mWeek) {
1450                return;
1451            }
1452            mDrawPaint.setColor(mWeekSeparatorLineColor);
1453            mDrawPaint.setStrokeWidth(mWeekSeperatorLineWidth);
1454            float startX;
1455            float stopX;
1456            if (isLayoutRtl()) {
1457                startX = 0;
1458                stopX = mShowWeekNumber ? mWidth - mWidth / mNumCells : mWidth;
1459            } else {
1460                startX = mShowWeekNumber ? mWidth / mNumCells : 0;
1461                stopX = mWidth;
1462            }
1463            canvas.drawLine(startX, 0, stopX, 0, mDrawPaint);
1464        }
1465
1466        /**
1467         * Draws the selected date bars if this week has a selected day.
1468         *
1469         * @param canvas The canvas to draw on
1470         */
1471        private void drawSelectedDateVerticalBars(Canvas canvas) {
1472            if (!mHasSelectedDay) {
1473                return;
1474            }
1475            mSelectedDateVerticalBar.setBounds(
1476                    mSelectedLeft - mSelectedDateVerticalBarWidth / 2,
1477                    mWeekSeperatorLineWidth,
1478                    mSelectedLeft + mSelectedDateVerticalBarWidth / 2,
1479                    mHeight);
1480            mSelectedDateVerticalBar.draw(canvas);
1481            mSelectedDateVerticalBar.setBounds(
1482                    mSelectedRight - mSelectedDateVerticalBarWidth / 2,
1483                    mWeekSeperatorLineWidth,
1484                    mSelectedRight + mSelectedDateVerticalBarWidth / 2,
1485                    mHeight);
1486            mSelectedDateVerticalBar.draw(canvas);
1487        }
1488
1489        @Override
1490        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
1491            mWidth = w;
1492            updateSelectionPositions();
1493        }
1494
1495        /**
1496         * This calculates the positions for the selected day lines.
1497         */
1498        private void updateSelectionPositions() {
1499            if (mHasSelectedDay) {
1500                final boolean isLayoutRtl = isLayoutRtl();
1501                int selectedPosition = mSelectedDay - mFirstDayOfWeek;
1502                if (selectedPosition < 0) {
1503                    selectedPosition += 7;
1504                }
1505                if (mShowWeekNumber && !isLayoutRtl) {
1506                    selectedPosition++;
1507                }
1508                if (isLayoutRtl) {
1509                    mSelectedLeft = (mDaysPerWeek - 1 - selectedPosition) * mWidth / mNumCells;
1510
1511                } else {
1512                    mSelectedLeft = selectedPosition * mWidth / mNumCells;
1513                }
1514                mSelectedRight = mSelectedLeft + mWidth / mNumCells;
1515            }
1516        }
1517
1518        @Override
1519        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
1520            mHeight = (mListView.getHeight() - mListView.getPaddingTop() - mListView
1521                    .getPaddingBottom()) / mShownWeekCount;
1522            setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec), mHeight);
1523        }
1524    }
1525
1526}
1527