private void UpdateHeaderProperty(
GridViewColumnHeader header, // the header need to update
DependencyProperty targetDP, // the target DP on header
DependencyProperty columnDP, // the DP on Column as 1st source, can be Null
DependencyProperty gvDP // the DP on GridView as 2nd source
)
{
if (gvDP == ColumnHeaderContainerStyleProperty
&& header.Role == GridViewColumnHeaderRole.Padding)
{
// Because padding header has no chance to be instantiated by a sub-classed GridViewColumnHeader,
// we ignore GridView.ColumnHeaderContainerStyle silently if its TargetType is not GridViewColumnHeader (or parent)
// I.e. for padding header, only accept the GridViewColumnHeader as TargetType
Style style = ColumnHeaderContainerStyle;
if (style != null && !style.TargetType.IsAssignableFrom(typeof(GridViewColumnHeader)))
{
// use default style for padding header in this case
header.Style = null;
return;
}
}
GridViewColumn column = header.Column;
object value = null;
if (column != null /* not the padding one */
&& columnDP != null /* Column doesn't has ContextMenu property*/)
{
value = column.GetValue(columnDP);
}
if (value == null)
{
value = this.GetValue(gvDP);
}
header.UpdateProperty(targetDP, value);
}
