> Gawd, tracing what happens when you resize a form is MIND NUMBING stuff.
>
> Anyhow, the chain of events near as I can tell:
>
> you resize the form
> windows sends WM_SIZE to the form, form enters WMSize
> during handling of WM_SIZE the align code resizes the form
> WMSize called recursively to handle new aligned size
> various processing
> WMSize exits...
> ...back to (eventually) WMSize
> WMSize exits again
> controls get repositioned based on new size
This bit must be wrong - the status bar gets placed when the form is
resized but BEFORE the forms alignment is taken into affect. The
status bar is not positioned after the form is positioned and sized.
> Now I could be completely wrong, but it looks like the re-entrance to WMSize
> is causing at least part of the problem. There are various flags and
> counters to prevent controls getting repositioned before the size/align
> sequence is completed, but I think there's a locking problem where some
> internal rect is not updated correctly before repositioning the controls.
>
> This is a bug, and frankly it's not one I'd like to tackle with my limited
> knowledge of VCL internals. There's too much going on behind the scenes in
> response to WM_SIZE for me to make sense of in less than a couple of days of
> study. Just finding the sequence above took almost an hour, and that was
> after I coerced BCB into letting me call some 'private' member functions :>
>
> Call me crazy, but shouldn't the size limitations (again, alignment and
> constraints) be applied in response to WM_SIZING? That way you only get a
> WM_SIZE message with a valid window size that has already had the size
> limits imposed. No more changing size half way through handling WM_SIZE,
> which should eliminate this bug.
>
> But then WM_SIZING didn't appear until NT4, so I guess it wouldn't work on
> NT3.51... anyone still writing for that? <G>
I am going to work this one out later - when I have a break - cos it is pissing
me off. And you are correct - it will take a while.
Chrissy.
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