how to know if a GTK window is minimized in ruby - ruby

Question

i want to know if the window is minimized or not. i have connected window-state-event signal from GtkWidget to this function
def on_main_window_hide(object, event)
if event.changed_mask & Gdk::WindowState::ICONIFIED
if event.new_window_state & Gdk::WindowState::ICONIFIED
puts("minimize" + $counter.to_s)
$counter+=1
else
puts ("unminimize")
end
end
end
and even after doing minimizing and unminimizing couple of times .. it never prints if the window is unminimized, here is the output
minimize0
minimize1
minimize2
minimize3
minimize4
plus, minimizing gives the window-state-event signal twice, like if minimize0 is initial value then on minimizing it becomes minimize2
how can i detect properly if a window is minimized ?

Answer 1

I think you got confused by the callback name. The window-state-event signal gets emitted for every state event change, so the callback should be called on_main_window_state_event as it will be emitted not only when the window hides. Then you can check the event mask for changes.
Your callback has a redundant if condition. From the API, the changed_mask is a:
mask specifying what flags have changed
And window_new_state is also a mask but contains:
the new window state, a combination of GdkWindowState bits
This means that the second if condition will always evaluate as true if the first one also evaluates as true but the else branch will never happen. If you want your "unminimize" print to occur then you must remove the second if condition and move the print to the else branch of the first if condition. Another option would be to check for the bit mask and really check the status.
Your code should be:
def on_main_window_state_event(object, event)
if event.changed_mask & Gdk::WindowState::ICONIFIED
puts("minimize" + $counter.to_s)
$counter+=1
else
puts ("unminimize")
end
end