GTK detecting window resize from the user

Question

In GTK (or pygtk or gtkmm...)

How can I detect that an application window has been manually resized by the user, as is typically done by dragging the window's edge?

I need to find a way to differentiate manual resizes from resizes that originate from gtk, such as changes in window content.

Answer 1

Have you tried connecting to the GDK_CONFIGURE event?

Check out this example under the "Moving window" section. The example shows a callback doing something when the window is moved, but the configure event is a catch-all for moving, resizing and stack order events.

Answer 2

I managed to pull this off by watching for size_allocate and size_request signals on the GtkWindow. If size_request ever got smaller, I called resize(1,1). If size_allocate was ever bigger than expected, I turned the system off.

One thing I made sure to handle was size_request returning big, then small, and having size_allocate be big and then small. I don't know if this is possible, but I fixed it by making sure to only decrease the expected values for size_allocate when I got a smaller size_allocate, not when I got a smaller size_request.

Make sure that your size_request handler comes after the base class' handler so that you get the right values. I did this by overriding the method and then calling the base class method first.

I've tried this in both 1 and 2 dimensions and it seems to work either way.