Checkbox and text overlap problem

[flylink888]

Specify a column of data as Checkbox and text, and there is overlap when loading the data. When the mouse passes, it will display normal.
This situation is no problem in the 6.X version.

[joachimmarder]

We did not have any similar reports for V7 in the past 2 years.

When reporting a bug, please respect our guidelines for reporting bugs as written on project homepage: Please provide a sample project that allows us to replicate the bug, or provide in detail how one needs to modify one of the included sample project so that the bug occurs.

[flylink888]

Thank you for your reply, I added relevant examples, please see the attachment!
VSTDemo.zip

[joachimmarder]

You must not access the members of PVirtualNode directly unless you know what you do, see also #832. Chnage the line

Node.CheckType := ctCheckBox;

to

Sender.CheckType[Node] := ctCheckBox;

and it works

[flylink888]

Thank you!

[flylink888]

@joachimmarder
I follow the method you said:
Sender.CheckType[Node] := ctCheckBox;
In Demo's code:
for i := 1 to 1000 do .......
When it loads 1000 pieces of data or more, drag the scroll bar with the mouse and observe that the check box on the right and the text still overlap momentarily.
The same situation, I tested with 6.X version, no problem.

[joachimmarder]

When it loads 1000 pieces of data or more, drag the scroll bar with the mouse and observe that the check box on the right and the text still overlap momentarily.

Sorry, but I don't see this. But the OnGetText is a bad place to set the check type, as it occurs during painting. This would better fit in Button1Click() or the OnBeforeGetCheckState event.

[flylink888]

@joachimmarder
I tested to set the check type in Button1Click() . It works very well!
I used the second method, but I couldn't find the OnBeforeGetCheckState event.
Please forgive me for being serious, ha ha!