Re: DrawingArea in ScrolledWindow

[Alexander Gehlert <alexander gehlert raritan com>]

Hi,

> 2)  How can I get the dimensions of the visible part?  (I tried
> manually adding the Viewport, then calling
> get_window()->get_geometry(), but that gave a value slightly too
> large; that seems to track things unnecessarily and I'm not sure
> exactly how much I need to deduct.)
>   
you could do the following (not sure if it is the best solution ;-) )...

get the H- and VAdjustment of your Scrolledwindow:

   m_pHAdj=get_hadjustment();
   m_pVAdj=get_vadjustment();

connect the changed and value_changed signal

   m_pHAdj->signal_value_changed ().connect( sigc::mem_fun(*this, 
&ScrolledWindow::on_scrollbar_changed) );
   m_pVAdj->signal_value_changed ().connect( sigc::mem_fun(*this, 
&ScrolledWindow::on_scrollbar_changed) );
   m_pHAdj->signal_changed ().connect( sigc::mem_fun(*this, 
&ScrolledWindow::on_scrollbar_changed) );
   m_pVAdj->signal_changed ().connect( sigc::mem_fun(*this, 
&ScrolledWindow::on_scrollbar_changed) );

void ScrolledWindow::on_scrollbar_changed(){
   double value_v, value_h, size_v, size_h;

   value_h=m_pHAdj->get_value();
   value_v=m_pVAdj->get_value();
   size_h =m_pHAdj->get_page_size(); //current dimension
   size_v =m_pVAdj->get_page_size();  //current dimension

}

Regards Alex

--
Alexander Gehlert 
reply to : alexander gehlert raritan com

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