public DataTemplate GetTemplate(IVirtualListViewAdapter adapter, int position)
{
if (position == 0)
{
if (HeaderTemplate != null)
{
return(HeaderTemplate);
}
if (SectionHeaderTemplateSelector != null)
{
return(SectionHeaderTemplateSelector.SelectGroupTemplate(adapter, 0));
}
if (SectionHeaderTemplate != null)
{
return(SectionHeaderTemplate);
}
}
var linear = 0;
if (HeaderTemplate != null)
{
linear++;
}
for (int s = 0; s < adapter.Sections; s++)
{
if (HasSectionHeader)
{
if (position == linear)
{
return(SectionHeaderTemplateSelector?.SelectGroupTemplate(adapter, s)
?? SectionHeaderTemplate);
}
linear++;
}
var itemsInSection = adapter.ItemsForSection(s);
// It's an item in the section, return it for this item
if (position < linear + itemsInSection)
{
var itemIndex = position - linear;
return(ItemTemplateSelector?.SelectItemTemplate(adapter, s, itemIndex) ?? ItemTemplate);
}
linear += itemsInSection;
if (HasSectionFooter)
{
if (position == linear)
{
return(SectionFooterTemplateSelector?.SelectGroupTemplate(adapter, s)
?? SectionFooterTemplate);
}
linear++;
}
}
return(FooterTemplate);
}
public (DataTemplate template, PositionInfo info) GetTemplateAndInfo(IVirtualListViewAdapter adapter, int sectionIndex, int itemIndex)
{
var realSectionIndex = sectionIndex;
if (HasGlobalHeader)
{
if (sectionIndex == 0)
{
return(HeaderTemplate, new PositionInfo
{
Kind = PositionKind.Header
});
}
// Global header takes up a section, real adapter is 1 less
realSectionIndex--;
}
var realNumberOfSections = adapter.Sections;
if (HasGlobalFooter)
{
if (realSectionIndex >= realNumberOfSections)
{
return(FooterTemplate, new PositionInfo
{
Kind = PositionKind.Footer
});
}
}
var realItemsInSection = adapter.ItemsForSection(realSectionIndex);
var realItemIndex = itemIndex;
var itemsAdded = 0;
if (HasSectionHeader)
{
itemsAdded++;
realItemIndex--;
if (itemIndex == 0)
{
return(SectionHeaderTemplateSelector?.SelectGroupTemplate(adapter, realSectionIndex) ?? SectionHeaderTemplate,
new PositionInfo
{
Kind = PositionKind.SectionHeader,
ItemsInSection = realItemsInSection,
SectionIndex = realSectionIndex,
BindingContext = adapter.Section(realSectionIndex),
NumberOfSections = realNumberOfSections
});
}
}
if (HasSectionFooter)
{
itemsAdded++;
if (itemIndex >= realItemsInSection + itemsAdded - 1)
{
return(SectionFooterTemplateSelector?.SelectGroupTemplate(adapter, realSectionIndex) ?? SectionFooterTemplate,
new PositionInfo
{
Kind = PositionKind.SectionFooter,
ItemsInSection = realItemsInSection,
SectionIndex = realSectionIndex,
BindingContext = adapter.Section(realSectionIndex),
NumberOfSections = realNumberOfSections
});
}
}
return(ItemTemplateSelector?.SelectItemTemplate(adapter, realSectionIndex, realItemIndex) ?? ItemTemplate,
new PositionInfo
{
Kind = PositionKind.Item,
ItemsInSection = realItemsInSection,
SectionIndex = realSectionIndex,
ItemIndex = realItemIndex,
BindingContext = adapter.Item(realSectionIndex, realItemIndex),
NumberOfSections = realNumberOfSections,
});
}