Listbox

General
1

Hello,
how can i give a Method Listbox1.Rows to add a row from inside my Method?
(without giving the Method the whole Listbox)

2

I do not understand. The LR says:

Allows you to iterate through all the rows in a ListBox.
3

[quote=472770:@Emile Schwarz]I do not understand. The LR says:

Allows you to iterate through all the rows in a ListBox.

yes, but why i can’t use a list somewhere in a oop language.
its by design?

4

[quote=472783:@Markus Rauch]yes, but why i can’t use a list somewhere in a oop language.
its by design?[/quote]
You can use it anywhere it’s in scope. There’s some information about scope here https://documentation.xojo.com/getting_started/object-oriented_programming/oop_design_concepts.html#Encapsulation but scope was one of the things I found easier to learn by playing with it.

I’m not sure entirely understand what problem you’re running into though. Maybe an example project to show?

5

You can’t manipulate the listbox data directly, you have to use AddRow, AddRowAt, RemoveRowAt etc. the Rows function is returning a copy of the data. Manipulating it has no effect on the ListBox.

6

I think so too but i not expect this in a oop language.

i would expect this

Var items(2) As String
items(0) = "Row A"
items(1) = "Row B"
items(2) = "Row C"

listbox1.Rows = items
7

Where in the LR did you learned that ?

8

You could always add that functionality to a subclass…
Create a subclass of listbox and add a method:

Public Sub rows(assigns rows() as string) self.initialvalue = join(rows,chr(13)) End Sub

Listbox doesn’t provide that behavior by default but you can always submit a feature request via Feedback

9

[quote=472793:@Markus Rauch]I think so too but i not expect this in a oop language.

i would expect this

[code]
Var items(2) As String
items(0) = “Row A”
items(1) = “Row B”
items(2) = “Row C”

listbox1.Rows = items
[/code][/quote]
Ah! That could be quite useful though. The way Listbox currently works you can set a single row at once in that manner, but I’m not aware of it being able to do multiple rows like that. I suppose you could write an extends method to do so, but it would be a reasonable feature request in my book. Edit: this is exactly what Jim said!

10

[quote=472795:@jim mckay]You could always add that functionality to a subclass…
Create a subclass of listbox and add a method:
Listbox doesn’t provide that behavior by default but you can always submit a feature request via Feedback[/quote]
thats true. thank you.

i think i should use subclass more often.

11

You should! Subclassing is great. Knowing when to is also just as valuable. In this situation I think an extends might be of more general use. It would enable the functionality on any Listbox and wouldn’t require you change any control superclasses.

This might work, but I wrote it in the post editor so you should review it!

[code]Global Sub AddRows(extends oLB as Listbox, paramarray arsRows() as String)
for ti as Integer = 0 to arsRows.Ubound
oLB.AddRow(arsRows(ti))

next ti
End Sub[/code]