ListBox().WidthActual errors

Hello guys,

it seems that there are some problems with ListBox().WidthActual,

If you create a window then drop a listbox and then add in the open event of the listbox the size and the headers and the size of each cell, even if you set values that in total are bigger than the listbox size it seems that the horizontal bar is never fired and you cannot scroll on horizontal.

If you put the sizes in the IDE under the ColumnWidths it works.

Is that a bug or i just understood wrong the usage of this property .

Thanks.

I have never had this issue occur, please post some code that duplicates the problem for you

I can confirm that:

[code]// Open event of a listbox
Me.ColumnCount = 4
Me.HasHeading = True
Me.ScrollBarHorizontal = True

// This works:
Me.ColumnWidths = “30%,30%,30%,30%”

// This works:
Me.Column(0).WidthExpression = “30%”
Me.Column(1).WidthExpression = “30%”
Me.Column(2).WidthExpression = “30%”
Me.Column(3).WidthExpression = “30%”

// This does NOT work:
Dim columnWidth As Integer = 1.2 * Me.Width / Me.ColumnCount
Me.Column(0).WidthActual = columnWidth
Me.Column(1).WidthActual = columnWidth
Me.Column(2).WidthActual = columnWidth
Me.Column(3).WidthActual = columnWidth[/code]
The latter sets the columns to the correct width but the horizontal scrollbar does not appear.

Here is what i have in the open event :

[code] me.columnCount = 22

me.defaultRowHeight = 18

me.heading(0) = “Type”
me.heading(1) = “Et”
me.heading(2) = “Q. 01”
me.heading(3) = “Q. 02”
me.heading(4) = “Q. 03”
me.heading(5) = “Q. 04”
me.heading(6) = “Q. 05”
me.heading(7) = “Q. 06”
me.heading(8) = “Q. 07”
me.heading(9) = “Q. 08”
me.heading(10) = “Q. 09”
me.heading(11) = “Q. 10”
me.Heading(12) = “Qt. 11”
me.Heading(13) = “Q. 12”
me.Heading(14) = “Q. 13”
me.Heading(15) = “Q. 14”
me.Heading(16) = “Q. 15”
me.Heading(17) = “Q. 16”
me.Heading(18) = “Q. 17”
me.Heading(19) = “Q. 18”
me.Heading(20) = “Q. 19”
me.Heading(21) = “Q. 20”

me.columnAlignmentOffset(0) = 15

me.column(0).WidthActual = 200
me.column(1).WidthActual = 220
me.column(2).WidthActual = 70
me.column(3).WidthActual = 70
me.column(4).WidthActual = 70
me.column(5).WidthActual = 70
me.column(6).WidthActual = 70
me.column(7).WidthActual = 70
me.column(8).WidthActual = 70
me.column(9).WidthActual = 70
me.column(10).WidthActual = 70
me.column(11).WidthActual = 70
me.Column(12).WidthActual = 70
me.Column(13).WidthActual = 70
me.Column(14).WidthActual = 70
me.Column(15).WidthActual = 70
me.Column(16).WidthActual = 70
me.Column(17).WidthActual = 70
me.Column(18).WidthActual = 70
me.Column(19).WidthActual = 70
me.Column(20).WidthActual = 70
me.Column(21).WidthActual = 70[/code]

So another funny part is that if i put the Column widths like this 200, 230, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70 even if all the sizes are there still don`t see horizontal scroll bar.

I`ll debug more to see what happens here .

Ok so it seems that if on ColumnCount in the IDE you put a different number than the actual columns in the code it creates this issues.

so i did a test , i put 1 in ColumnCount in the IDE and i put me.columnCount = 22 so the open event does not override the IDE settings, if on the other hand i put the correct number in the IDE i have the needed functionality on the Horizontal scroll bar but again only when i have the sizes set in the Column Widths .

So it seems that the open event does not override the control default settings.

I can confirm that by putting this in the open event it works properly me.ColumnWidths = "200, 230, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70, 70"

So i guess the issue is only with the me.column(0).WidthActual part.

No, not at all. Read the documentation and you will see what you have to do to get the horizontal scrollbar (set a fixed value to all columns; these values can be different, but have to be fixed: 10, 200, 155…).

Unless I misunderstand the question.

Note: it takes me time to understand that.

This method doesn’t work for me. It sets the column widths correctly, but while the horizontal scrollbar responds to trackpad swipes left/right, it doesn’t respond to mouse clicks or drags.

What happens if you add a hidden column and use WidthExpression 0%

Actually, I have one hide (zero-width column) for every 3 regular columns. On occasion, those are opened up wider to reveal their content, but they’re frequently hidden - and the horizontal scrolling isn’t affected by their width (given that they’re always a fixed width).

I only ask because above Eli said that using WidthExpression made horizontal scroll work, where WidthActual did not. I thought maybe it might trick the ListBox into scrolling properly.

Did anyone file a bug report yet?

I got it.

Modifying WidthActual does not change ColumnWidths. Apparently, the scrollbar appears based on the values in ColumnWidths, the sum of WidthActual.

I believe it should be possible to put all the values of ColumnWidths in an array, and create a method so changing an element of that array would then change ColumnWidths automatically.

Something like this in ListBox1.Open :

[code] Dim ColumnsWidth() as string
for i as integer = 1 to me.ColumnCount
ColumnsWidth.Append(str(me.Column(i).WidthActual))
next

me.ColumnWidths = join(ColumnsWidth,",")
[/code]

The scrollbar appears right away.

Then in a module :

[code]Sub myColumnWidth(Extends LB as Listbox, Column as Integer, Assigns Width as Integer)
Dim ColumnsWidth() as string = split(LB.ColumnWidths,",")

ColumnsWidth(Column) = Str(Width)

LB.ColumnWidths = join(ColumnsWidth,",")

End Sub[/code]

To change a column width, do :

Listbox1.myColumnWidth(0) = 200