internal virtual void ClearSort()
{
this.currentSortDescriptor = null;
this.SortDirection = SortDirection.None;
this.UpdateHeaderControlSortDirection();
}
private void ChangeSortDescriptor(SortDescriptorBase newDescriptor)
{
if (this.Model != null && this.sortDescriptorCache != null)
{
this.Model.SortDescriptors.Remove(this.sortDescriptorCache);
}
this.sortDescriptorCache = newDescriptor;
}
internal virtual void ToggleSort(bool allowMultiple)
{
if (!this.CanSort)
{
this.ClearSort();
return;
}
this.updatingSort = true;
if (!allowMultiple)
{
this.Model.SortDescriptors.Clear();
}
if (this.currentSortDescriptor == null)
{
this.currentSortDescriptor = this.GetSortDescriptor();
if (this.currentSortDescriptor == null)
{
// Do nothing, we have an inheritor that returns null as a SortDescriptor.
return;
}
this.currentSortDescriptor.SortOrder = SortOrder.Ascending;
this.Model.SortDescriptors.Add(this.currentSortDescriptor);
this.SortDirection = SortDirection.Ascending;
}
else if (this.SortDirection == SortDirection.Ascending)
{
this.currentSortDescriptor.SortOrder = SortOrder.Descending;
if (!this.Model.SortDescriptors.Contains(this.currentSortDescriptor))
{
this.Model.SortDescriptors.Add(this.currentSortDescriptor);
}
this.SortDirection = SortDirection.Descending;
}
else
{
this.Model.SortDescriptors.Remove(this.currentSortDescriptor);
this.currentSortDescriptor = null;
this.SortDirection = SortDirection.None;
}
this.updatingSort = false;
this.UpdateHeaderControlSortDirection();
}
internal virtual void OnDescriptorAssociated(DataDescriptor descriptor)
{
if (descriptor is FilterDescriptorBase)
{
this.isFiltered = true;
this.UpdateFilterVisualState(this.isFiltered);
}
else if (descriptor != this.currentSortDescriptor)
{
var sortDescriptor = descriptor as SortDescriptorBase;
if (sortDescriptor != null)
{
this.currentSortDescriptor = sortDescriptor;
this.SortDirection = this.currentSortDescriptor.SortOrder == SortOrder.Ascending ? SortDirection.Ascending : SortDirection.Descending;
}
}
}
