Trait gdk4::prelude::ToplevelExtManual
source · pub trait ToplevelExtManual {
// Required method
fn connect_compute_size<F: Fn(&Toplevel, &mut ToplevelSize) + 'static>(
&self,
f: F
) -> SignalHandlerId;
}Expand description
Trait containing manually implemented methods of Toplevel.
Required Methods§
sourcefn connect_compute_size<F: Fn(&Toplevel, &mut ToplevelSize) + 'static>(
&self,
f: F
) -> SignalHandlerId
fn connect_compute_size<F: Fn(&Toplevel, &mut ToplevelSize) + 'static>( &self, f: F ) -> SignalHandlerId
Emitted when the size for the surface needs to be computed, when it is present.
It will normally be emitted during or after ToplevelExt::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.
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 ToplevelSize object. Failing to do so
will result in an arbitrary size being used as a result.