Resize columns DesktopListbox

General
1

I used an “old” method to resize the columns in a ListBox. I tried to convert this existing method to Xojo Version 2023 release 1.1.

// Change Column Widths

Var p As New Picture(10,10)
Var g As graphics = p.Graphics

Var CellWidth as Integer
Var ColumnSize as Integer

g.FontName = Me.FontName
g.FontSize = Me.FontSize

for Column As Integer = 0 to Me.ColumnCount-1
  ColumnSize = g.TextWidth(Me.HeaderAt(Column))
  
  for Row As Integer = 0 to Me.LastRowIndex
    CellWidth = g.TextWidth(Me.CellTextAt(Row, Column))
    if CellWidth > ColumnSize then 
      ColumnSize = CellWidth
    End If
  next Row
  
  Me.ColumnAttributesAt(Column).WidthActual = ColumnSize + 20
next Column

No errors found… But no resizing… What is wrong with this code?

2

This is the syntax:
ColumnAttributesAt(column As Integer, Assigns value As DesktopListBoxColumn)

does not looks the same (to me), but I may be wrong.

3

The documentation here for desktoplistbox: DesktopListBoxColumn — Xojo documentation
shows this example:

Me.ColumnAttributesAt(0).WidthActual = 80
Me.ColumnAttributesAt(1).WidthActual = 80
Me.ColumnAttributesAt(2).WidthActual = 45
4

When you say “but no resizing”, what happens if you change:

Me.ColumnAttributesAt(Column).WidthActual = ColumnSize + 20

to (for example)

Me.ColumnAttributesAt(Column).WidthActual = ColumnSize + 100

do the columns change size or not?
Can you check the value of ColumnSize before that line of code? You can put a break maybe ColumnSize = 0?

Can you provide a sample project?

5

The examples are probably far below ColumnAttributesAt… because there are none there: ColumnAttributesAt

Bad online documentation.

Sorry for the error.

6

Sorry folks… My code is just perfect. The header of the DesktopListbox was not yet initialized before the method was started. This piece of code works well to resize a DesktopListbox based on het headers and data in the columns.

Thank you all!

7

The documentation is really bad… It takes a long time to find the correct methods, properties…

8

I usually use https://docs.xojo.com but now that site is going away soon :frowning:

9

I do not found it so usefull: too near API2. Code taken from there does not compile in Xojo 2015…
And when you have a MacBook Pro i5 / code with MacBook Pro m1…