I have just upgraded from 11.2.6 to 12.2.2.
It appears that a TcxListbox with Scrollwidth set to non-zero (in this case 1014) does not repaint correctly when the user scrolls horizontally.
Attachment ListBoxBad.jpg shows how it looks after dragging the scroll bar all the way to the right, then returning it all the way back to the left.
It should look like attachment ListBoxGood.jpg
This behaviour is independent of the lokk and feel settings.
This is the definition from the DFM:
object lbObjects: TcxListBox
Left = 41
Top = 242
Width = 347
Height = 194
ItemHeight = 16
MultiSelect = True
ParentFont = False
ScrollWidth = 1014
Style.StyleController = dmBase.MasterEditStyle
TabOrder = 9
end
Here is the definition of the style controller (although as I said above, changing the style does not seem to affect the problem).:
object MasterEditStyle: TcxEditStyleController
Style.BorderColor = clWindowFrame
Style.BorderStyle = ebsFlat
Style.Color = clWhite
Style.Font.Charset = DEFAULT_CHARSET
Style.Font.Color = clWindowText
Style.Font.Height = -13
Style.Font.Name = 'Tahoma'
Style.Font.Style = []
Style.LookAndFeel.Kind = lfUltraFlat
Style.LookAndFeel.NativeStyle = False
Style.TransparentBorder = False
Style.IsFontAssigned = True
StyleDisabled.LookAndFeel.Kind = lfUltraFlat
StyleDisabled.LookAndFeel.NativeStyle = False
StyleFocused.LookAndFeel.Kind = lfUltraFlat
StyleFocused.LookAndFeel.NativeStyle = False
StyleHot.LookAndFeel.Kind = lfUltraFlat
StyleHot.LookAndFeel.NativeStyle = False
Left = 144
Top = 16
PixelsPerInch = 120
end
Here is first attachment
Here is second attachment
I was not able to reproduce this behavior. Attached is an example that works as expected on my side. Please modify it to illustrate the problem and attach it to your next message. We will examine it and do our best to find a solution. I am looking forward to hearing from you.
Hi Mikhail.
You are right, your example works fine. So I tried some experiments, and it turns out that the problem occurs when you set
the DoubleBuffered property to true. Add this line to the FormCreate method to make the problem occur.
cxListBox1.DoubleBuffered := true;
I'm afraid I still was not able to reproduce this behavior. Attached is my modified example that works as expected on my side. Would you please provide us with a video and modified my sample to demonstrate the issue?
Hi Mikhail, I have added a zip file containing an AVI with a video capturing the symptoms.
I also included a file which is a madExcdpt bug report. The stack trace in the bug report is not interesting, but
the report captures information about my environment (for example DLLs used, hardware config etc) that
might help you isolate the problem.
I also included all of the relevant source files, and the compiled exe that shows the symptoms.
If you need anything else, please don't hesitate to contact me.
Thanks,
John