private void PrepareGroupRow(GridRowModel decorator, DataGridGroupHeader groupHeader)
{
if (groupHeader != null)
{
groupHeader.Owner = this.owner;
var context = new GroupHeaderContext()
{
Level = decorator.ItemInfo.Level,
Descriptor = this.owner.GroupDescriptors[decorator.ItemInfo.Level],
Group = decorator.ItemInfo.Item as IDataGroup,
IsExpanded = !decorator.ItemInfo.IsCollapsed,
Grid = this.owner
};
groupHeader.DataContext = context;
groupHeader.IsExpanded = context.IsExpanded;
this.UpdateGroupHeaderStyleAndTemplate(groupHeader, context);
groupHeader.IndentWidth = this.owner.IndentWidth * decorator.ItemInfo.Level;
if (groupHeader.IsFrozen)
{
// We assume that no more that 20 GroupDescriptions will be added.
// If needed this number can be increased.
Canvas.SetZIndex(groupHeader, MaxGroupCount - decorator.ItemInfo.Level);
}
}
}
private void UpdateGroupHeaderStyleAndTemplate(DataGridGroupHeader groupHeader, GroupHeaderContext context)
{
var style = this.owner.GroupHeaderStyle;
if (style == null)
{
if (this.owner.GroupHeaderStyleSelector != null)
{
style = this.owner.GroupHeaderStyleSelector.SelectStyle(context, groupHeader);
}
}
if (style != null)
{
groupHeader.Style = style;
}
else
{
groupHeader.ClearValue(DataGridGroupHeader.StyleProperty);
}
var dataTemplate = this.owner.GroupHeaderTemplate;
if (dataTemplate == null)
{
if (this.owner.GroupHeaderTemplateSelector != null)
{
dataTemplate = this.owner.GroupHeaderTemplateSelector.SelectTemplate(context, groupHeader);
}
}
if (dataTemplate != null)
{
groupHeader.ContentTemplate = dataTemplate;
}
else
{
groupHeader.ClearValue(DataGridGroupHeader.ContentTemplateProperty);
}
}
