Re: How to get the window deiconify event?

[Kjell Ahlstedt <kjell ahlstedt bredband net>]

2012-12-23 10:02, Jiergir Ogoerg skrev:
> Hi,
> There are methods for iconify()ing (minimizing) and deiconify()ing a 
> window, but there are no obvious signals to get these events.
> I found here[1] how to get the iconify event, but how do I get the 
> deiconify event?
>
> I need 4 events (window hide/show/iconified/deiconified events), to 
> make my app smart enough to not bother repainting if it's not visible.
>
> Hide/show detects when the window goes to/from the system tray or when 
> it initially appears.
>
> Iconify/deiconify (on Ubuntu) happen when the app goes to/from the 
> left vertical bar by clicking the minimize window button and 
> respectively by clicking its icon in the left vertical bar.
>
>
> [1]
> http://cubicarch.wordpress.com/2012/06/11/hide-minimized-window-cgtkmm/
I think Gtk::Widget::signal_hide(), Gtk::Widget::signal_show() and 
Gtk::Widget::signal_window_state_event() is all you need. A handler of 
signal_window_state_event() takes a GdkEventWindowState* argument, and 
that structure contains 'changed_mask' and 'new_window_state' which show 
what has changed, and how it has changed. I haven't used this signal 
myself, but the documentation says it's emitted both when the window is 
iconified and when it's deiconified. See the documentation of 
Gtk::Window::iconify() and Gtk::Window::deiconify() at
http://developer.gnome.org/gtkmm/stable/classGtk_1_1Window.html

The test
  if (event->new_window_state==GDK_WINDOW_STATE_ICONIFIED)
in the page you link to, seems unsafe. new_window_state contains bit 
flags, and I suppose more than one flag can be set.
If you want to test one of the flags, this is better:
  if (event->new_window_state & GDK_WINDOW_STATE_ICONIFIED)

Possibly you need only signal_window_state_event(). 
GdkEventWindowState::new_window_state can also contain the flag 
GDK_WINDOW_STATE_WITHDRAWN, which means "the window is not shown." 
Probably that means it's hidden.

Kjell