We can add an interface function, to ask if bounds should be cached or sent directly. But before doing this, we should make sure that the win32 intf is doing, what it is told do to.
I have created a new example with a three nested groupboxes, all Align=alClient. (Unable to commit, because now the name server does not even know cvs.freepascal.org).

When you do this and add writeln in TWinControl.DoSendBoundsToInterface; and TWinControl.InvalidateClientRectCache;, you can see at least three bugs:

- The form is not resized after the LCL asked
the win32 interface to do so.
- the groupboxes are not resized after the LCL
asked the second time the win32 interface to do so
- The win32 intf does not tell the LCL, that
the clientrect of the groupboxes have changed

I think, these bugs must be fixed first before optimizing the LCL.

Mattias

Hi,

Currently aligning is done recursively, if you setbounds on a form which has a nested tabcontrol with a nested form with a nested form then the recursion goes down to the last form setting width/height and back up. The problem is that the win32 interface have differences between window/client size and this cannot be compensated if this resizing is done in one step. You can see this bug in the object inspector, differences accumulate causing the scrollbar to be partly visible among other things. It could be done if the form aligned it's controls and those controls call the interface immediately with their new position/size. Then the interface will report the new size back to the lcl which then continues aligning it's controls until all is done.

How about it?

Micha.

I just keep retrying until it works, usually it does within a couple of tries.

Ok, good point. Awaiting the example to appear in CVS...

Micha.