DayPickerView.java
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package com.fourmob.datetimepicker.date;
import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.os.Handler;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.AbsListView;
import android.widget.ListView;
public class DayPickerView extends ListView implements AbsListView.OnScrollListener, DatePickerDialog.OnDateChangedListener {
protected static final int GOTO_SCROLL_DURATION = 250;
protected static final int SCROLL_CHANGE_DELAY = 40;
public static int LIST_TOP_OFFSET = -1;
protected Context mContext;
protected Handler mHandler = new Handler();
protected SimpleMonthAdapter mAdapter;
private final DatePickerController mController;
protected int mCurrentMonthDisplayed;
protected int mCurrentScrollState = 0;
private boolean mPerformingScroll;
protected long mPreviousScrollPosition;
protected int mPreviousScrollState = 0;
protected ScrollStateRunnable mScrollStateChangedRunnable = new ScrollStateRunnable();
protected SimpleMonthAdapter.CalendarDay mSelectedDay = new SimpleMonthAdapter.CalendarDay();
protected SimpleMonthAdapter.CalendarDay mTempDay = new SimpleMonthAdapter.CalendarDay();
protected int mNumWeeks = 6;
protected boolean mShowWeekNumber = false;
protected int mDaysPerWeek = 7;
protected float mFriction = 1.0F;
public DayPickerView(Context context, DatePickerController datePickerController) {
super(context);
mController = datePickerController;
mController.registerOnDateChangedListener(this);
setLayoutParams(new AbsListView.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
setDrawSelectorOnTop(false);
init(context);
onDateChanged();
}
public int getMostVisiblePosition() {
final int firstPosition = getFirstVisiblePosition();
final int height = getHeight();
int maxDisplayedHeight = 0;
int mostVisibleIndex = 0;
int i=0;
int bottom = 0;
while (bottom < height) {
View child = getChildAt(i);
if (child == null) {
break;
}
bottom = child.getBottom();
int displayedHeight = Math.min(bottom, height) - Math.max(0, child.getTop());
if (displayedHeight > maxDisplayedHeight) {
mostVisibleIndex = i;
maxDisplayedHeight = displayedHeight;
}
i++;
}
return firstPosition + mostVisibleIndex;
}
public boolean goTo(SimpleMonthAdapter.CalendarDay day, boolean animate, boolean setSelected, boolean forceScroll) {
// Set the selected day
if (setSelected) {
mSelectedDay.set(day);
}
mTempDay.set(day);
final int position = (day.year - mController.getMinYear())
* SimpleMonthAdapter.MONTHS_IN_YEAR + day.month;
View child;
int i = 0;
int top = 0;
// Find a child that's completely in the view
do {
child = getChildAt(i++);
if (child == null) {
break;
}
top = child.getTop();
} while (top < 0);
// Compute the first and last position visible
int selectedPosition;
if (child != null) {
selectedPosition = getPositionForView(child);
} else {
selectedPosition = 0;
}
if (setSelected) {
mAdapter.setSelectedDay(mSelectedDay);
}
// Check if the selected day is now outside of our visible range
// and if so scroll to the month that contains it
if (position != selectedPosition || forceScroll) {
setMonthDisplayed(mTempDay);
mPreviousScrollState = OnScrollListener.SCROLL_STATE_FLING;
if (animate && Build.VERSION.SDK_INT >= 11) {
smoothScrollToPositionFromTop(position, LIST_TOP_OFFSET, GOTO_SCROLL_DURATION);
return true;
} else {
postSetSelection(position);
}
} else if (setSelected) {
setMonthDisplayed(mSelectedDay);
}
return false;
}
public void init(Context paramContext) {
mContext = paramContext;
setUpListView();
setUpAdapter();
setAdapter(mAdapter);
}
protected void layoutChildren() {
super.layoutChildren();
if (mPerformingScroll) {
mPerformingScroll = false;
}
}
public void onChange() {
setUpAdapter();
setAdapter(mAdapter);
}
public void onDateChanged() {
goTo(mController.getSelectedDay(), false, true, true);
}
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
SimpleMonthView child = (SimpleMonthView) view.getChildAt(0);
if (child == null) {
return;
}
// Figure out where we are
long currScroll = view.getFirstVisiblePosition() * child.getHeight() - child.getBottom();
mPreviousScrollPosition = currScroll;
mPreviousScrollState = mCurrentScrollState;
}
public void onScrollStateChanged(AbsListView absListView, int scroll) {
mScrollStateChangedRunnable.doScrollStateChange(absListView, scroll);
}
public void postSetSelection(final int position) {
clearFocus();
post(new Runnable() {
public void run() {
DayPickerView.this.setSelection(position);
}
});
onScrollStateChanged(this, 0);
}
protected void setMonthDisplayed(SimpleMonthAdapter.CalendarDay calendarDay) {
this.mCurrentMonthDisplayed = calendarDay.month;
invalidateViews();
}
protected void setUpAdapter() {
if (mAdapter == null) {
mAdapter = new SimpleMonthAdapter(getContext(), mController);
}
mAdapter.setSelectedDay(this.mSelectedDay);
mAdapter.notifyDataSetChanged();
}
protected void setUpListView() {
setCacheColorHint(0);
setDivider(null);
setItemsCanFocus(true);
setFastScrollEnabled(false);
setVerticalScrollBarEnabled(false);
setOnScrollListener(this);
setFadingEdgeLength(0);
setFrictionIfSupported(ViewConfiguration.getScrollFriction() * mFriction);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
void setFrictionIfSupported(float friction) {
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
setFriction(friction);
}
}
protected class ScrollStateRunnable implements Runnable {
private int mNewState;
/**
* Sets up the runnable with a short delay in case the scroll state
* immediately changes again.
*
* @param view The list view that changed state
* @param scrollState The new state it changed to
*/
public void doScrollStateChange(AbsListView view, int scrollState) {
mHandler.removeCallbacks(this);
mNewState = scrollState;
mHandler.postDelayed(this, SCROLL_CHANGE_DELAY);
}
@Override
public void run() {
mCurrentScrollState = mNewState;
// Fix the position after a scroll or a fling ends
if (mNewState == OnScrollListener.SCROLL_STATE_IDLE
&& mPreviousScrollState != OnScrollListener.SCROLL_STATE_IDLE
&& mPreviousScrollState != OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
mPreviousScrollState = mNewState;
int i = 0;
View child = getChildAt(i);
while (child != null && child.getBottom() <= 0) {
child = getChildAt(++i);
}
if (child == null) {
// The view is no longer visible, just return
return;
}
int firstPosition = getFirstVisiblePosition();
int lastPosition = getLastVisiblePosition();
boolean scroll = firstPosition != 0 && lastPosition != getCount() - 1;
final int top = child.getTop();
final int bottom = child.getBottom();
final int midpoint = getHeight() / 2;
if (scroll && top < LIST_TOP_OFFSET) {
if (bottom > midpoint) {
smoothScrollBy(top, GOTO_SCROLL_DURATION);
} else {
smoothScrollBy(bottom, GOTO_SCROLL_DURATION);
}
}
} else {
mPreviousScrollState = mNewState;
}
}
}
}