What's the easiest way to allow only vertical window resizing?

StackOverflow https://stackoverflow.com/questions/23642610

  •  22-07-2023
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Question

I'm coding an MFC application that needs to allow vertical window resizing and prevent horizontal resizing. What's the simplest way to do this?

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Solution

You want to catch WM_SIZING and WM_GETMINMAXINFO to force the proper width, (WM_NCHITTEST to filter out any responses leading to the user trying to change the width (Might not be needed...)).

If there were no multi-monitor setups, WM_GETMINMAXINFO alone would suffice.

Also take a look at GetSystemMenu(), for possibly tailoring your system menu.

BTW: This answer is not MFC-specific.

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