Re: "changed" signal

[muppet <scott asofyet org>]

On Mar 5, 2005, at 9:39 AM, Ari Jolma wrote:

> muppet wrote:
>
> > Indeed, because "changed" is one of Gtk2::Adjustment's signals, not a 
> >  Gtk2::Scale's.
> >
> > Also, the "changed" signal means that the properties of the 
> > adjustment  have changed -- e.g. the max value, the min
>
>
> yes, actually I'm trying to catch the "resize-window" event, i.e., 
> when the user resizes the window, the scrollbar is also resized and 
> its page_size changes...

mea culpa, i misunderstood you.

i think the reason you weren't seeing a "changed" signal when the 
widget resized is that the max and min were not changing.  for the 
increments, i'm not sure.

by the way, the configure-event is sent from X when the window is 
resized or moved.  for a general gtk widget, the way to hook into this 
is the size-allocate signal, which is emitted when the size 
calculations are performed and the widget is given a new allocation 
(actual size).

> anyway, I think I'm going back to inherit my custom widget from 
> ScrolledWindow (which I got working) and not reinvent that from 
> scratch just to insert Rulers nicely..

ah, you didn't want an hscale, you wanted an hscrollbar.

i've implemented scrolled widgets in C; there's a deficiency in the 
bindings that makes it impossible to implement natively scrolled 
widgets in perl --- you can't set the set-scroll-adjustments-signal 
variable in the class.  it should still be possible, however, to 
implement a scrolling container (which i've also done only in C) in 
perl.


> In my custom widget I have an image, which I make on the fly. I also 
> can't seem to make the widget support flexible resizing of the window, 
> this also works in ScrolledWindow.

"flexible resizing"?

do you mean scaling the image to whatever size the window is?  hook 
into the size-allocate signal and use Gtk2::Gdk::Pixbuf::scale_simple 
and Gtk2::Gtk::Image::set_from_pixbuf to show the image at the size of 
the window.

do you mean shrink the widget below the size of the image?  in 
size-allocate, set the size request to be something small, e.g. 0,0.

--
If I lived in Teletubby Land, the homicide rate would be four.
  -- elysse