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Adjusting window sizes in X11

Started by incertia Feb 15, 2017 at 7:50 PM 3 replies 2.9k views

Original Post

Feb 15, 2017 at 7:50 PM

Under Windows platforms, we have access to AdjustWindowRectEx to make sure that the client area has the desired size. Due to the diversity of window managers available on Linux systems, is there a way to have X11 ask the current window manager what the correct properties should be to get the desired client area, or should we wait for the first expose event to determine the correct settings?

On a related note, is there a way to impose window size restrictions in X11? Or is it up to the window manager to honor the WM_NORMAL_HINTS property?

frob

Feb 15, 2017 at 8:31 PM

is there a way to have X11 ask the current window manager what the correct properties should be to get the desired client area

XCreateWindow() and XResizeWindow() and related functions use width and height values for the client area. They already are the internal window sizes. Any frames from the window manager are in addition to the values specified as width and height.

incertia

Feb 15, 2017 at 8:41 PM

Hmm, so if a window manager desides to grow a border internally, that should be a bug? My current issue is with XMonad, where I have configured it to give floating windows a border width of two pixels, and the client area shrinks to make room for the border.

frob

Feb 15, 2017 at 9:01 PM

Check the manual for your system. Not sure what you're using, but it appears the many online manuals mention it the same: Specify the width and height, which are the created window's inside dimensions and do not include the created window's borders.

incertia

Feb 15, 2017 at 9:14 PM

Okay so it looks like a window manager issue. Launching X without a window manager creates the borders on the outside.

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