Re: [gtk-list] Widget offset

[Havoc Pennington <rhp zirx pair com>]

On Wed, 2 Jun 1999, Joshua Richardson wrote:
> The event box fills all the area that the scrolled window allocates to it.
> So, I seem to have two options:
> 
> 1) Find out the offset of the actual displayed image relative to the event
> box, and then subtract this from the event coordinates.

As a wild guess, the GtkImage is also filling the event box, but the
actual displayed image is centered in the GtkImage. So it would be hard to
do this. But I haven't looked at the source.

But if the event box is doing the centering, just look at GtkImage's
allocation.x and allocation.y.

> 2) Keep the event box from filling the viewport.
> 

I think you could do this by placing it in a GtkAlignment. GtkTable or
GtkFixed might also be made to work.

> For option 1, I tried printing out the allocation.x, allocation.y fields
> of all widgets up the parent tree, beginning with the image, but they are
> all zero.  The GTK_MISC(my_image)->xpad/ypad fields are also zero.
> 

You want to look after the widgets are realized and mapped. You might try
connecting to the "map" signal and checking the allocation then. 

You could also connect to configure_event on the toplevel window, perhaps.

I'm not sure which of the several suggestions here will work best -
hopefully these are some ideas though.

Havoc