Updated September 2024; see History
cformat switch: @
For multi-level lists, a column must be defined using this type, and must also contain a digit indicating the hierarchical level of each row (0 through 63 with 0 being the top level.) Note that you would almost always want to also use the H code to hide this column, otherwise you will have a visible column containing the level indicators. Due to some internal complexities in the control, it may not be possible to hide the first column; to avoid this problem, make sure the @ column is not the first one defined.
The compound code @@ may be used in place of just @ to force the left/right arrow keys to always act as expand/contract/navigate keys, even if the XTF_LEFT, XTF_RIGHT, or XTF_EDITABLE flags are present. See XTREE Techniques - Mouse and Keyboard.
Note that in the case of Property Sheets, '@@' indicates level 2, and the left/right arrow expand/contract is automatically enabled if neither XTF_LEFT or XTF_RIGHT is specified.
History
2024 September, A-Shell 7.0.1762: Resolve conflict between the normal list hierarchy '@@' (enabling the use of left/right arrows for expand/contract) and '@@' meaning level 2.
2023 August, A-Shell 1737: Increase maximum number of multi-level trees from nine to 63.
