Hi all.
I'm trying to capture mouse events in a DrawingArea ( in Gtk3 ). I'm
adapting code at http://www.perlmonks.org/?node_id=583578 ... but when
I go:
$self->{drawing_area}->set_events(
[ qw/ exposure-mask
leave-notify-mask
button-press-mask
pointer-motion-mask
pointer-motion-hint-mask
/
]
);
... I get a warning:
Gtk-CRITICAL **: gtk_widget_set_events: assertion
'!_gtk_widget_get_realized (widget)' failed
I've tried putting this later on in the code when I guess the widget
*should* be realized, eg at the end of the render_graph() method which
I hook up thus:
$self->{drawing_area}->signal_connect( draw => sub {
$self->render_graph( @_ ) } );
... but it still gives the same error.
Next I try to connect to a signal handler anyway:
$self->{drawing_area}->signal_connect(
'motion_notify_event'
, sub { $self->handle_graph_mouse_move( @_ ) }
);
... but this handler never gets called.
I guess things have changed in Gtk3? I haven't been able to find an
updated demo, even in C. Any hints as to what I'm missing?
Dan
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