internal void HandleGroupFlyoutDescriptorContentTap(object sender, EventArgs e)
{
var descriptor = (sender as FrameworkElement).DataContext as GroupDescriptorBase;
if (descriptor == null)
{
Debug.Assert(false, "Invalid HandleGroupFlyoutHeaderClosed event sender");
return;
}
// raise the FlyoutGroupHeaderTap command
var context = new FlyoutGroupHeaderTapContext()
{
Action = DataGridFlyoutGroupHeaderTapAction.ChangeSortOrder,
Descriptor = descriptor
};
this.Owner.commandService.ExecuteCommand(CommandId.FlyoutGroupHeaderTap, context);
}
internal void HandleGroupFlyoutHeaderClosed(object sender, EventArgs e)
{
var descriptor = (sender as FrameworkElement).DataContext as GroupDescriptorBase;
if (descriptor == null)
{
Debug.Assert(false, "Invalid HandleGroupFlyoutHeaderClosed event sender");
return;
}
if (descriptor is CollectionViewGroupDescriptor)
{
Debug.Assert(false, "CollectionViewGroupDescriptor cannot be removed by the user.");
return;
}
int previousCount = this.Owner.GroupDescriptors.Count;
// raise the FlyoutGroupHeaderTap command and see whether the descriptor count has changed
var context = new FlyoutGroupHeaderTapContext()
{
Action = DataGridFlyoutGroupHeaderTapAction.RemoveDescriptor,
Descriptor = descriptor
};
this.Owner.commandService.ExecuteCommand(CommandId.FlyoutGroupHeaderTap, context);
if (previousCount == this.Owner.GroupDescriptors.Count)
{
// the user has prevented the removal of the associated descriptor, so do nothing
return;
}
if (this.Owner.GroupDescriptors.Count > 0)
{
this.groupFlyoutContent.ClearUI();
this.groupFlyoutContent.PrepareUI();
}
else
{
this.groupFlyout.IsOpen = false;
}
}
