Emitted when the size for the surface needs to be computed, when it is present.
This signal will normally be emitted during or after a call to
gdk_toplevel_present(), depending on the configuration
received by the windowing system. It may also be emitted at any
other point in time, in response to the windowing system
spontaneously changing the configuration of the toplevel surface.
It is the responsibility of the toplevel user to handle this signal
and compute the desired size of the toplevel, given the information
passed via the
GdkToplevelSize object. Failing to do so
will result in an arbitrary size being used as a result.
|Default handler: |
The default handler is called after the handlers added via
The data is owned by the caller of the function.