gtk版本號, 2.8.8， 我查了一下前面的gtk版本，相同信號在不同gtk版本中不同id號，可以用g_single_lookup函數，用信號名來查找id號。
以下是gtk默認的信號名列表：
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
show
hide
map
unmap
realize
unrealize
size_request
size_allocate
state_changed
parent_set
hierarchy_changed
style_set
direction_changed
grab_notify
child_notify
mnemonic_activate
grab_focus
focus
event
event_after
button_press_event
button_release_event
scroll_event
motion_notify_event
composited_changed
delete_event
destroy_event
expose_event
key_press_event
key_release_event
enter_notify_event
leave_notify_event
configure_event
focus_in_event
focus_out_event
map_event
unmap_event
property_notify_event
selection_clear_event
selection_request_event
selection_notify_event
selection_received
selection_get
proximity_in_event
proximity_out_event
drag_leave
drag_begin
drag_end
drag_data_delete
drag_motion
drag_drop
drag_data_get
drag_data_received
visibility_notify_event
client_event
no_expose_event
window_state_event
grab_broken_event
popup_menu
show_help
accel_closures_changed
screen_changed
can_activate_accel