Struct MeasureHandles 

pub struct MeasureHandles<'a> {
    pub window: (&'a mut (dyn Any + 'static), &'a mut (dyn Any + 'static)),
    pub app: &'a mut (dyn Any + 'static),
}

The handles a facade supplies for the duration of one layout pass.

The engine forwards these from LayoutEngine::compute_layout to the measure callbacks the facade registered, and never reads them itself. The facade erases its window as the two halves its callback reassembles rather than as a single handle, because a window that borrows per-frame state is not 'static, which erasing through Any would require.

Fields

window: (&'a mut (dyn Any + 'static), &'a mut (dyn Any + 'static))

The two halves of the facade’s window.

app: &'a mut (dyn Any + 'static)

The facade’s application handle.