/// <inheritdoc />
/// <summary>
/// Requests information about a column.
/// By calling this repeatedly the shell can detect how many columns there are.
/// </summary>
/// <param name="index">The column's zero-based index. It is an arbitrary value that is used to enumerate columns (DWORD dwIndex).</param>
/// <param name="columnInfo">Information about the column (psci).</param>
int IColumnProvider.GetColumnInfo(int index, ref ShellColumnInfo columnInfo)
{
Debug.WriteLine("[{0}] ColumnProviderBase.IColumnProvider.GetColumnInfo, index={1}", Id, index);
if (!initialized)
{
throw new COMException("Initialize was not called");
}
if (hideDesktopColumns || index >= columnInfos.Count)
{
return(HResults.False); // tell the shell there are no more columns.
}
columnInfo = columnInfos[index];
return(HResults.Ok);
}
protected void RegisterColumn(Guid formatId, int propertyId, string title, uint defaultWidthInCharacters,
ListViewAlignment format = ListViewAlignment.Left, ShellColumnState state = ShellColumnState.TypeString)
{
var columnId = new ShellColumnId {
FormatId = formatId, PropertyId = propertyId
};
// Note: description field is not used by the shell.
var columnInfo = new ShellColumnInfo
{
ColumnId = columnId,
Title = title,
DefaultWidthInCharacters = defaultWidthInCharacters,
Format = format,
State = state | ShellColumnState.Extended | ShellColumnState.SecondaryUI,
variantType = 0
};
// Note: VT_LPSTR/VT_BSTR works ok. Other types seems to have issues with sorting.
// TODO = VT_BSTR
columnInfos.Add(columnInfo);
}
protected void RegisterColumn(Guid formatId, int propertyId, string title, uint defaultWidthInCharacters,
ListViewAlignment format = ListViewAlignment.Left, ShellColumnState state = ShellColumnState.TypeString)
{
Contract.Requires(title != null);
Contract.Requires(title.Length < ShellColumnInfo.MaxTitleLength);
var columnId = new ShellColumnId {
FormatId = formatId, PropertyId = propertyId
};
// Note: description field is not used by the shell.
var columnInfo = new ShellColumnInfo();
columnInfo.ColumnId = columnId;
columnInfo.Title = title;
columnInfo.DefaultWidthInCharacters = defaultWidthInCharacters;
columnInfo.Format = format;
columnInfo.State = state | ShellColumnState.Extended | ShellColumnState.SecondaryUI;
// Note: VT_LPSTR/VT_BSTR works ok. Other types seems to have issues with sorting.
columnInfo.variantType = 0; // TODO = VT_BSTR
columnInfos.Add(columnInfo);
}