Re: question on GtkScrolledWindow

[Iago Rubio <iago iagorubio com>]

Hi Gregory,

On Fri, 2008-02-01 at 20:31 +0800, Gregory Hosler wrote:
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> Hi,
> 
> I have 2 questions on GtkScrolledWindow
> 
> The 1st.
> 
> I want the scroll bar to be "looser". As an example. Suppose I have one item, an icon, in
> a horizontally scrollable window. Lets say that the window is 200 pixels across, and the
> icon is 10 pixels, with scroll bar "always on" (GTK_POLICY_ALWAYS).
> 
> The default visual will be like this:
[snip]
> What I want is the ability to move that individual icon from side to side. This means I
> want a smalled scrollbar, so that I can scroll the window "off the screen". Something like
> this:
[snip]
> How might I achieve this ?

I'm not completely sure about your requirements, but I bet you'd better
look the docs about GtkViewport.

You can put into it a broader widget so it can be scrolled "out of the
screen" ... well, it's just scrolled out of the container window ;-)

Check the attachment for an example.

> Secondly, How do I control that scrolling programmaticly. i.e. Lets say that then user has
> clicked on a button and my response to that click is (among other things), to re-center
> the scrolled window (or to center it on a different object).
> 
> Which method(s) might I want to be looking at ?

Take a look on GtkScrolledWindow/GtkViewport adjustment (GtkAdjustment).

You must fiddle with its value. Again, check the attached example.

> I've looked at the GtkScrolledWindow DevHelp page, and, well, perhaps I'm just not used to
> the terms on that page to recognize what I need to look at.
> 
> Many thanks in advance.
> 

Hope this helps.

> - -Greg Hosler
> 
> - ------------------------------------------+
> 
> Please also check the log file at "/dev/null" for additional information.
> 		(from /var/log/Xorg.setup.log)
> 
> | Greg Hosler					ghosler redhat com    |
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-- 
Iago Rubio