public static void OnDescriptorChanged(BindableObject bo, GroupDescriptorBase oldValue, GroupDescriptorBase newValue)
{
(bo as RadListView).PropertyChanged += (o, e) => {
var listview = o as RadListView;
if (e.PropertyName != RadListView.ItemsSourceProperty.PropertyName)
{
return;
}
var list = listview.ItemsSource as IList;
if (list != null && list.Count > 0)
{
var descriptor = GroupDescriptorBehavior.GetDescriptor(listview) as GroupDescriptorBase;
if (descriptor != null && !listview.GroupDescriptors.Contains(descriptor))
{
listview.GroupDescriptors.Add(descriptor);
}
}
else
{
var descriptor = GroupDescriptorBehavior.GetDescriptor(listview) as GroupDescriptorBase;
if (descriptor != null)
{
listview.GroupDescriptors.Remove(descriptor);
}
}
};
}
internal override void PrepareUI()
{
if (this.Owner == null || !this.IsTemplateApplied)
{
return;
}
this.Container.Owner = this.Owner.Owner;
for (int i = 0; i < this.Owner.Owner.GroupDescriptors.Count; i++)
{
GroupDescriptorBase descriptor = this.Owner.Owner.GroupDescriptors[i];
DataGridFlyoutGroupHeader header = new DataGridFlyoutGroupHeader();
this.SetupDragDropProperties(header, i);
header.DataContext = descriptor;
header.CloseButtonClick += this.Owner.HandleGroupFlyoutHeaderClosed;
header.DragSurfaceRequested += this.HandleDragSurfaceRequested;
header.DescriptorContentTap += this.Owner.HandleGroupFlyoutDescriptorContentTap;
header.ParentGrid = this.Owner.Owner;
this.Container.Elements.Add(header);
}
int childCount = this.Container.Elements.Count;
if (childCount > 0)
{
var lastHeader = this.Container.Elements[childCount - 1] as DataGridFlyoutGroupHeader;
lastHeader.BottomGlyphOpacity = 0.0;
}
}
public override bool CanStartReorder(GroupDescriptorBase groupDescriptorBase)
{
if (!this.IsGroupHeaderReorderEnabled)
{
return(false);
}
return(base.CanStartReorder(groupDescriptorBase));
}
private void Grouping(object sender, GridViewGroupingEventArgs e)
{
if (e.Action == GroupingEventAction.Place)
{
var cgd = e.GroupDescriptor as ColumnGroupDescriptor;
if (cgd != null && cgd.Column.UniqueName == "Date")
{
e.Cancel = true;
if (grid.GroupDescriptors.OfType <GroupDescriptorBase>().Where(d => d.DisplayContent == "Year" || d.DisplayContent == "Month").Any())
{
return;
}
AddCustomGroupDescriptors();
}
}
else if (e.Action == GroupingEventAction.Remove)
{
var gd = e.GroupDescriptor as GroupDescriptorBase;
GroupDescriptorBase gdToRemove = null;
if (gd != null)
{
if (gd.DisplayContent == "Year")
{
gdToRemove = grid.GroupDescriptors.OfType <GroupDescriptorBase>().Where(d => d.DisplayContent == "Month").FirstOrDefault();
}
else if (gd.DisplayContent == "Month")
{
gdToRemove = grid.GroupDescriptors.OfType <GroupDescriptorBase>().Where(d => d.DisplayContent == "Year").FirstOrDefault();
}
}
if (gdToRemove != null)
{
grid.GroupDescriptors.Remove(gdToRemove);
}
}
}
public static void SetDescriptor(BindableObject bo, GroupDescriptorBase value)
{
bo.SetValue(GroupDescriptorBehavior.DescriptorProperty, value);
}
public void SetGroupDescriptor(GroupDescriptorBase groupDescriptor)
{
this.DataGrid.GroupDescriptors.Add(groupDescriptor);
}
