Xojo Documentation Xojo Documentation

Method

ListBox.AddFolder(text as String)

Supported for all project types and targets.

Appends text in a new row to the end of the list and adds disclosure triangle only if the Hierarchical property is set to True.

Notes

For multi-column ListBoxes, Item is always assigned to column zero. In the case of hierarchical ListBoxes, AddFolder appends Item to the subitems of the expanded row when called in the ExpandRow event.

Sample Code

The following example adds creates a hierarchical ListBox. Note that AddFolder must be called to create the hierarchical relationship.

Dim u As Integer
Dim s1, sub1 As String
Me.ColumnWidths = "150,0"
s1 = "Michigan,Ohio,Minnesota"
sub1 = "Grand Blanc,Bad Axe,Flint,Benton Harbor,"_
+ "Detroit;Cleveland,Columbus,Akron,Pleasantville;St. Paul,Frostbite Falls"
u = CountFields(s1, ",")
For i As Integer = 1 To u
If NthField(sub1, ";", i) <> "" Then
Me.AddFolder("")
Me.Cell(i - 1, 1) = NthField(sub1, ";", i)
End If
Me.Cell(i - 1, 0) = NthField(s1, ",", i)
Next
Me.ColumnCount = 1

See the section “Hierarchical Listboxes” in the Notes section for illustrations of the ListBox in expanded and collapsed states.

Volume Browser Example

The FileBrowser example project displays the file structure of the user's hard disks as a hierarchical ListBox using custom ListBox subclass. The Open event of the custom class builds the hierarchical list using AddFolder in a For loop for all of the mounted volumes.

You can find this in the Examples folder: Examples/Files/FileBrowser