Re: Motion events in a DrawingArea

[Jeremy Volkening <jdv base2bio com>]

On Wed, Aug 16, 2017 at 10:12:04PM +1000, Daniel Kasak wrote:
> 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

Also, when I have used complex DrawingAreas in past projects, it was 
convenient to create a separate subclass. Here is the preamble from a 
Gtk2 DrawingArea-based widget I wrote:

# --begin code--

package Gtk2::MassCanvas;

use warnings;
use strict;
use 5.012;

use Glib qw/TRUE FALSE/;
use Gtk2;
use Cairo;
use Gtk2::Pango;

use Glib::Object::Subclass
   Gtk2::DrawingArea::,
       signals => {
               expose_event         => \&expose,
               configure_event      => \&resize,
               motion_notify_event  => \&on_motion,
               button_press_event   => \&on_click,
               button_release_event => \&on_release,
               key_press_event      => \&_on_key_press,
               scroll_event         => \&on_scroll,
       };

# --end code--


This makes setting up signal handling a piece of cake. I don't know this 
still works in Gtk3, however,

Jeremy



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