/// <summary>
/// SelectedDateProperty property changed handler.
/// </summary>
/// <param name="d">DatePicker that changed its SelectedDate.</param>
/// <param name="e">DependencyPropertyChangedEventArgs.</param>
private static void OnSelectedDateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DatePicker dp = d as DatePicker;
Debug.Assert(dp != null);
Collection <DateTime> addedItems = new Collection <DateTime>();
Collection <DateTime> removedItems = new Collection <DateTime>();
DateTime?addedDate;
DateTime?removedDate;
dp.CoerceValue(DisplayDateStartProperty);
dp.CoerceValue(DisplayDateEndProperty);
dp.CoerceValue(DisplayDateProperty);
addedDate = (DateTime?)e.NewValue;
removedDate = (DateTime?)e.OldValue;
if (dp.SelectedDate.HasValue)
{
DateTime day = dp.SelectedDate.Value;
dp.SetTextInternal(dp.DateTimeToString(day));
// When DatePickerDisplayDateFlag is TRUE, the SelectedDate change is coming from the Calendar UI itself,
// so, we shouldn't change the DisplayDate since it will automatically be changed by the Calendar
if ((day.Month != dp.DisplayDate.Month || day.Year != dp.DisplayDate.Year) && !dp._calendar.DatePickerDisplayDateFlag)
{
dp.SetCurrentValueInternal(DisplayDateProperty, day);
}
dp._calendar.DatePickerDisplayDateFlag = false;
}
else
{
dp.SetWaterMarkText();
}
if (addedDate.HasValue)
{
addedItems.Add(addedDate.Value);
}
if (removedDate.HasValue)
{
removedItems.Add(removedDate.Value);
}
dp.OnSelectedDateChanged(new CalendarSelectionChangedEventArgs(DatePicker.SelectedDateChangedEvent, removedItems, addedItems));
DatePickerAutomationPeer peer = UIElementAutomationPeer.FromElement(dp) as DatePickerAutomationPeer;
// Raise the propetyChangeEvent for Value if Automation Peer exist
if (peer != null)
{
string addedDateString = addedDate.HasValue ? dp.DateTimeToString(addedDate.Value) : "";
string removedDateString = removedDate.HasValue ? dp.DateTimeToString(removedDate.Value) : "";
peer.RaiseValuePropertyChangedEvent(removedDateString, addedDateString);
}
}