/// <summary>
/// Removes all items from the collection.
/// </summary>
/// <remarks>
/// This implementation raises the CollectionChanged event.
/// </remarks>
protected override void ClearItems()
{
EnsureValidThread();
base.ClearItems();
_owner.UpdateMonths();
}
/// <summary>
/// Adds all the dates in the specified range, which includes the first
/// and last dates, to the collection.
/// </summary>
/// <param name="start">The first date to add to the collection.</param>
/// <param name="end">The last date to add to the collection.</param>
public void AddRange(DateTime start, DateTime end)
{
DateTime?rangeStart;
// increment parameter specifies if the Days were selected in
// Descending order or Ascending order based on this value, we add
// the days in the range either in Ascending order or in Descending
// order
int increment = (DateTime.Compare(end, start) >= 0) ? 1 : -1;
_addedItems.Clear();
rangeStart = start;
_isRangeAdded = true;
if (_owner.IsMouseSelection)
{
// In Mouse Selection we allow the user to be able to add
// multiple ranges in one action in MultipleRange Mode. In
// SingleRange Mode, we only add the first selected range.
while (rangeStart.HasValue && DateTime.Compare(end, rangeStart.Value) != -increment)
{
if (CalendarEx.IsValidDateSelection(_owner, rangeStart))
{
Add(rangeStart.Value);
}
else
{
if (_owner.SelectionMode == CalendarExSelectionMode.SingleRange)
{
_owner.HoverEnd = rangeStart.Value.AddDays(-increment);
break;
}
}
rangeStart = DateTimeHelper.AddDays(rangeStart.Value, increment);
}
}
else
{
// If CalendarSelectionMode.SingleRange and a user
// programmatically tries to add multiple ranges, we will throw
// away the old range and replace it with the new one. In order
// to provide the removed items without an additional event, we
// are calling ClearInternal
if (_owner.SelectionMode == CalendarExSelectionMode.SingleRange && Count > 0)
{
foreach (DateTime item in this)
{
_owner.RemovedItems.Add(item);
}
ClearInternal();
}
while (rangeStart.HasValue && DateTime.Compare(end, rangeStart.Value) != -increment)
{
Add(rangeStart.Value);
rangeStart = DateTimeHelper.AddDays(rangeStart.Value, increment);
}
}
_owner.OnSelectedDatesCollectionChanged(new SelectionChangedEventArgs(_owner.RemovedItems, _addedItems));
_owner.RemovedItems.Clear();
_owner.UpdateMonths();
_isRangeAdded = false;
}
