custom listbox would override the checkbox

General
#1

If I define a listbox and use checkbox in some columen.
I can’t see the checkbox “checked” when I set it checked. because the
CellBackgroundPaint seems override it.

Function CellBackgroundPaint(g As Graphics, row As Integer, column As Integer) Handles CellBackgroundPaint as Boolean

//don’t khow how to avoid it from this?
//just return false when the cell is “checkbox” would not affected.
End Function

#2

so that the result is:

the xojo 's example project “PropertyListExample”, you never could click a checkbox to set it’s state unless you select the row first.

#3

I use this.
but I don’t think is a good Idea:

Function CellBackgroundPaint(g As Graphics, row As Integer, column As Integer) Handles CellBackgroundPaint as Boolean
If row > ListCount-1 Then Return False

Dim type As RowType
type = RowTag(row)

Select Case type
Case RowType.Header
g.ForeColor = &c66CCFF00
g.FillRect(0, 0, g.Width, g.Height)
Return True

Case RowType.Text

Case Rowtype.CheckBox
If column = 1 Then
CellType(row, column) = ListBox.TypeCheckbox
g.ForeColor =&c00000000
g.FillRect(5, 5, 10,10)
return true
End If

End Select
End Function

#4

I’ve just tried the example. Selected row 2, clicked on the checkbox in row 5.

In my app I have a complex window with one listbox having the first column as checkboxes. Even with custom drawing it’s always been possible to select the checkbox without having to select the row first.

Your code in CellBackgroundPaint looks okay.

#5

g.ForeColor =&c00000000
g.FillRect(5, 5, 10,10)

I have to calculate this?

I dont know why your example is ok. but here I am using windows 7,and xojo 2016r4.

default example code is:

	If row > ListCount-1 Then Return False
	
	Dim type As RowType
	type = RowTag(row)
	
	Select Case type
	Case RowType.Header
			g.ForeColor = &c66CCFF00
			g.FillRect(0, 0, g.Width, g.Height)
			Return True
			
	Case RowType.Text
			
	Case Rowtype.CheckBox
			If column = 1 Then
					CellType(row, column) = ListBox.TypeCheckbox 
			End If
			
	End Select

and I select row one,and click row 5,
the check state will auto “disapper” ,seems be covered by “write” color.

#6

[quote=303631:@Beatrix Willius]I’ve just tried the example. Selected row 2, clicked on the checkbox in row 5.

In my app I have a complex window with one listbox having the first column as checkboxes. Even with custom drawing it’s always been possible to select the checkbox without having to select the row first.

Your code in CellBackgroundPaint looks okay.[/quote]

I think I have found the reason.
that is you are ok,because your computer is use the windows default theme (or appereance)

and I just cancel of the windows default effect theme and use pure style

#7