gtkmain.c

gtk是linux一款强大的夸平台的图形化开发工具

    }

  if (quit_functions)
    {
      GList *reinvoke_list = NULL;
      GtkQuitFunction *quitf;

      while (quit_functions)
	{
	  quitf = quit_functions->data;

	  tmp_list = quit_functions;
	  quit_functions = g_list_remove_link (quit_functions, quit_functions);
	  g_list_free_1 (tmp_list);

	  if ((quitf->main_level && quitf->main_level != gtk_main_loop_level) ||
	      gtk_quit_invoke_function (quitf))
	    {
	      reinvoke_list = g_list_prepend (reinvoke_list, quitf);
	    }
	  else
	    {
	      gtk_quit_destroy (quitf);
	    }
	}
      if (reinvoke_list)
	{
	  GList *work;
	  
	  work = g_list_last (reinvoke_list);
	  if (quit_functions)
	    quit_functions->prev = work;
	  work->next = quit_functions;
	  quit_functions = work;
	}

      gdk_flush ();
    }
	      
  main_loops = g_slist_remove (main_loops, loop);

  g_main_destroy (loop);

  gtk_main_loop_level--;
}

guint
gtk_main_level (void)
{
  return gtk_main_loop_level;
}

void
gtk_main_quit (void)
{
  g_return_if_fail (main_loops != NULL);

  g_main_quit (main_loops->data);
}

gint
gtk_events_pending (void)
{
  gboolean result;
  
  GDK_THREADS_LEAVE ();  
  result = g_main_pending();
  GDK_THREADS_ENTER ();

  return result;
}

gint 
gtk_main_iteration (void)
{
  GDK_THREADS_LEAVE ();
  g_main_iteration (TRUE);
  GDK_THREADS_ENTER ();

  if (main_loops)
    return !g_main_is_running (main_loops->data);
  else
    return TRUE;
}

gint 
gtk_main_iteration_do (gboolean blocking)
{
  GDK_THREADS_LEAVE ();
  g_main_iteration (blocking);
  GDK_THREADS_ENTER ();

  if (main_loops)
    return !g_main_is_running (main_loops->data);
  else
    return TRUE;
}

void 
gtk_main_do_event (GdkEvent *event)
{
  GtkWidget *event_widget;
  GtkWidget *grab_widget;
  GdkEvent *next_event;
  GList *tmp_list;

  /* If there are any events pending then get the next one.
   */
  next_event = gdk_event_peek ();
  
  /* Try to compress enter/leave notify events. These event
   *  pairs occur when the mouse is dragged quickly across
   *  a window with many buttons (or through a menu). Instead
   *  of highlighting and de-highlighting each widget that
   *  is crossed it is better to simply de-highlight the widget
   *  which contained the mouse initially and highlight the
   *  widget which ends up containing the mouse.
   */
  if (next_event)
    if (((event->type == GDK_ENTER_NOTIFY) ||
	 (event->type == GDK_LEAVE_NOTIFY)) &&
	((next_event->type == GDK_ENTER_NOTIFY) ||
	 (next_event->type == GDK_LEAVE_NOTIFY)) &&
	(next_event->type != event->type) &&
	(next_event->any.window == event->any.window))
      {
	/* Throw both the peeked copy and the queued copy away 
	 */
	gdk_event_free (next_event);
	next_event = gdk_event_get ();
	gdk_event_free (next_event);
	
	return;
      }

  if (next_event)
    gdk_event_free (next_event);

  /* Find the widget which got the event. We store the widget
   *  in the user_data field of GdkWindow's.
   *  Ignore the event if we don't have a widget for it, except
   *  for GDK_PROPERTY_NOTIFY events which are handled specialy.
   *  Though this happens rarely, bogus events can occour
   *  for e.g. destroyed GdkWindows. 
   */
  event_widget = gtk_get_event_widget (event);
  if (!event_widget)
    {
      /* To handle selection INCR transactions, we select
       * PropertyNotify events on the requestor window and create
       * a corresponding (fake) GdkWindow so that events get
       * here. There won't be a widget though, so we have to handle
	   * them specially
	   */
      if (event->type == GDK_PROPERTY_NOTIFY)
	gtk_selection_incr_event (event->any.window,
				  &event->property);
      
      return;
    }
  
  /* Push the event onto a stack of current events for
   * gtk_current_event_get().
   */
  current_events = g_list_prepend (current_events, event);
  
  /* If there is a grab in effect...
   */
  if (grabs)
    {
      grab_widget = grabs->data;
      
      /* If the grab widget is an ancestor of the event widget
       *  then we send the event to the original event widget.
       *  This is the key to implementing modality.
       */
      if (GTK_WIDGET_IS_SENSITIVE (event_widget) &&
	  gtk_widget_is_ancestor (event_widget, grab_widget))
	grab_widget = event_widget;
    }
  else
    {
      grab_widget = event_widget;
    }

  /* Not all events get sent to the grabbing widget.
   * The delete, destroy, expose, focus change and resize
   *  events still get sent to the event widget because
   *  1) these events have no meaning for the grabbing widget
   *  and 2) redirecting these events to the grabbing widget
   *  could cause the display to be messed up.
   * 
   * Drag events are also not redirected, since it isn't
   *  clear what the semantics of that would be.
   */
  switch (event->type)
    {
    case GDK_NOTHING:
      break;
      
    case GDK_DELETE:
      gtk_widget_ref (event_widget);
      if (!gtk_widget_event (event_widget, event) &&
	  !GTK_OBJECT_DESTROYED (event_widget))
	gtk_widget_destroy (event_widget);
      gtk_widget_unref (event_widget);
      break;
      
    case GDK_DESTROY:
      /* Unexpected GDK_DESTROY from the outside, ignore for
       * child windows, handle like a GDK_DELETE for toplevels
       */
      if (!event_widget->parent)
	{
	  gtk_widget_ref (event_widget);
	  if (!gtk_widget_event (event_widget, event) &&
	      !GTK_OBJECT_DESTROYED (event_widget))
	    gtk_widget_destroy (event_widget);
	  gtk_widget_unref (event_widget);
	}
      break;
      
    case GDK_PROPERTY_NOTIFY:
    case GDK_EXPOSE:
    case GDK_NO_EXPOSE:
    case GDK_FOCUS_CHANGE:
    case GDK_CONFIGURE:
    case GDK_MAP:
    case GDK_UNMAP:
    case GDK_SELECTION_CLEAR:
    case GDK_SELECTION_REQUEST:
    case GDK_SELECTION_NOTIFY:
    case GDK_CLIENT_EVENT:
    case GDK_VISIBILITY_NOTIFY:
      gtk_widget_event (event_widget, event);
      break;

    case GDK_BUTTON_PRESS:
    case GDK_2BUTTON_PRESS:
    case GDK_3BUTTON_PRESS:
    /* We treat button 4-5 specially, assume we have
     * a MS-style scrollwheel mouse, and try to find
     * a plausible widget to scroll. We also trap
     * button 4-5 double and triple clicks here, since
     * they will be generated if the user scrolls quickly.
     */
      if ((grab_widget == event_widget) &&
	  (event->button.button == 4 || event->button.button == 5))
	{
	  GtkWidget *range = NULL;
	  GtkWidget *scrollwin;
	  
	  if (GTK_IS_RANGE (event_widget))
	    range = event_widget;
	  else
	    {
	      scrollwin = gtk_widget_get_ancestor (event_widget,
						   GTK_TYPE_SCROLLED_WINDOW);
	      if (scrollwin)
		range = GTK_SCROLLED_WINDOW (scrollwin)->vscrollbar;
	    }
	  
	  if (range && GTK_WIDGET_VISIBLE (range))
	    {
	      if (event->type == GDK_BUTTON_PRESS)
		{
		  GtkAdjustment *adj = GTK_RANGE (range)->adjustment;
		  gfloat new_value = adj->value + ((event->button.button == 4) ? 
						   -adj->page_increment / 2: 
						    adj->page_increment / 2);
		  new_value = CLAMP (new_value, adj->lower, adj->upper - adj->page_size);
		  gtk_adjustment_set_value (adj, new_value);
		}
	      break;
	    }
	}
      gtk_propagate_event (grab_widget, event);
      break;

    case GDK_KEY_PRESS:
    case GDK_KEY_RELEASE:
      if (key_snoopers)
	{
	  if (gtk_invoke_key_snoopers (grab_widget, event))
	    break;
	}
      /* else fall through */
    case GDK_MOTION_NOTIFY:
    case GDK_BUTTON_RELEASE:
    case GDK_PROXIMITY_IN:
    case GDK_PROXIMITY_OUT:
      gtk_propagate_event (grab_widget, event);
      break;
      
    case GDK_ENTER_NOTIFY:
      if (GTK_WIDGET_IS_SENSITIVE (grab_widget))
	{
	  gtk_widget_event (grab_widget, event);
	  if (event_widget == grab_widget)
	    GTK_PRIVATE_SET_FLAG (event_widget, GTK_LEAVE_PENDING);
	}
      break;
      
    case GDK_LEAVE_NOTIFY:
      if (GTK_WIDGET_LEAVE_PENDING (event_widget))
	{
	  GTK_PRIVATE_UNSET_FLAG (event_widget, GTK_LEAVE_PENDING);
	  gtk_widget_event (event_widget, event);
	}
      else if (GTK_WIDGET_IS_SENSITIVE (grab_widget))
	gtk_widget_event (grab_widget, event);
      break;
      
    case GDK_DRAG_STATUS:
    case GDK_DROP_FINISHED:
      gtk_drag_source_handle_event (event_widget, event);
      break;
    case GDK_DRAG_ENTER:
    case GDK_DRAG_LEAVE:
    case GDK_DRAG_MOTION:
    case GDK_DROP_START:
      gtk_drag_dest_handle_event (event_widget, event);
      break;
    }
  
  tmp_list = current_events;
  current_events = g_list_remove_link (current_events, tmp_list);
  g_list_free_1 (tmp_list);
}

gint
gtk_true (void)
{
  return TRUE;
}

gint
gtk_false (void)
{
  return FALSE;
}

void
gtk_grab_add (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  
  if (!GTK_WIDGET_HAS_GRAB (widget))
    {
      GTK_WIDGET_SET_FLAGS (widget, GTK_HAS_GRAB);
      
      grabs = g_slist_prepend (grabs, widget);
      gtk_widget_ref (widget);
    }
}

GtkWidget*
gtk_grab_get_current (void)
{
  if (grabs)
    return GTK_WIDGET (grabs->data);
  return NULL;
}

void
gtk_grab_remove (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  
  if (GTK_WIDGET_HAS_GRAB (widget))
    {
      GTK_WIDGET_UNSET_FLAGS (widget, GTK_HAS_GRAB);
      
      grabs = g_slist_remove (grabs, widget);
      gtk_widget_unref (widget);
    }
}

void
gtk_init_add (GtkFunction function,
	      gpointer	  data)
{
  GtkInitFunction *init;
  
  init = g_new (GtkInitFunction, 1);
  init->function = function;
  init->data = data;
  
  init_functions = g_list_prepend (init_functions, init);
}

guint
gtk_key_snooper_install (GtkKeySnoopFunc snooper,
			 gpointer	 func_data)
{
  GtkKeySnooperData *data;
  static guint snooper_id = 1;

  g_return_val_if_fail (snooper != NULL, 0);

  data = g_new (GtkKeySnooperData, 1);
  data->func = snooper;
  data->func_data = func_data;
  data->id = snooper_id++;
  key_snoopers = g_slist_prepend (key_snoopers, data);

  return data->id;
}

void
gtk_key_snooper_remove (guint		 snooper_id)
{
  GtkKeySnooperData *data = NULL;
  GSList *slist;

  slist = key_snoopers;
  while (slist)
    {
      data = slist->data;
      if (data->id == snooper_id)
	break;

      slist = slist->next;
      data = NULL;
    }
  if (data)
    key_snoopers = g_slist_remove (key_snoopers, data);
}

static gint
gtk_invoke_key_snoopers (GtkWidget *grab_widget,
			 GdkEvent  *event)
{
  GSList *slist;
  gint return_val = FALSE;

  slist = key_snoopers;
  while (slist && !return_val)
    {
      GtkKeySnooperData *data;

      data = slist->data;
      slist = slist->next;
      return_val = (*data->func) (grab_widget, (GdkEventKey*) event, data->func_data);
    }

  return return_val;
}

guint
gtk_quit_add_full (guint		main_level,
		   GtkFunction		function,
		   GtkCallbackMarshal	marshal,
		   gpointer		data,
		   GtkDestroyNotify	destroy)
{
  static guint quit_id = 1;
  GtkQuitFunction *quitf;
  
  g_return_val_if_fail ((function != NULL) || (marshal != NULL), 0);

  if (!quit_mem_chunk)
    quit_mem_chunk = g_mem_chunk_new ("quit mem chunk", sizeof (GtkQuitFunction),
				      512, G_ALLOC_AND_FREE);
  
  quitf = g_chunk_new (GtkQuitFunction, quit_mem_chunk);
  
  quitf->id = quit_id++;
  quitf->main_level = main_level;
  quitf->function = function;
  quitf->marshal = marshal;
  quitf->data = data;
  quitf->destroy = destroy;

  quit_functions = g_list_prepend (quit_functions, quitf);
  
  return quitf->id;
}