Re: button_press_event from image

[muppet <scott asofyet org>]

On Oct 10, 2006, at 3:59 AM, Ratcliffe, Jeffrey (Peters) wrote:

> > you must pack the Gtk2::Image inside a Gtk2::EventBox, as the image
> > widget does not listen to the button events.
>
> Thanks. It works a treat now.
>
> Why does the Gtk2::Image not inherit the signals from Gtk2::Widget  
> - amongst them button_press_event?

GtkImage, like GtkLabel, is used primarily to display pixels.  Nine  
times out of ten, you just show and image, without needing it to  
respond to events, or wanting its parent to respond to events (e.g.  
when packed into a button).  So, GtkImage does not have a GdkWindow  
of its own (a.k.a. a "NO_WINDOW" widget).  This saves server  
resources and makes the event handling in your app simpler in the  
common case.  Widgets without a GdkWindow cannot receive input  
events.  So, if you want a GtkImage to accept input events, you have  
to pack it into a GtkEventBox, which is essentially a GtkWidget whose  
sole purpose is to have a GdkWindow.


--
Brian: If i recall correctly, this is the physics department.
Chris: That explains all that gravity.
    -- Family Guy, "The Story on Page One"