gtkmenu.c

gtk是linux一款强大的夸平台的图形化开发工具

  g_return_if_fail (GTK_IS_MENU (menu));
  
  widget = GTK_WIDGET (menu);
  menu_shell = GTK_MENU_SHELL (menu);
  
  menu_shell->parent_menu_shell = parent_menu_shell;
  menu_shell->active = TRUE;
  menu_shell->button = button;

  /* If we are popping up the menu from something other than, a button
   * press then, as a heuristic, we ignore enter events for the menu
   * until we get a MOTION_NOTIFY.  
   */

  current_event = gtk_get_current_event();
  if (current_event)
    {
      if ((current_event->type != GDK_BUTTON_PRESS) &&
	  (current_event->type != GDK_ENTER_NOTIFY))
	menu_shell->ignore_enter = TRUE;
      gdk_event_free (current_event);
    }

  if (menu->torn_off)
    {
      gtk_menu_tearoff_bg_copy (menu);

      /* We force an unrealize here so that we don't trigger redrawing/
       * clearing code - we just want to reveal our backing pixmap.
       */
      gtk_menu_reparent (menu, menu->toplevel, TRUE);
    }
  
  menu->parent_menu_item = parent_menu_item;
  menu->position_func = func;
  menu->position_func_data = data;
  menu_shell->activate_time = activate_time;

  gtk_menu_position (menu);

  /* We need to show the menu _here_ because code expects to be
   * able to tell if the menu is onscreen by looking at the
   * GTK_WIDGET_VISIBLE (menu)
   */
  gtk_widget_show (GTK_WIDGET (menu));
  gtk_widget_show (menu->toplevel);
  
  /* Find the last viewable ancestor, and make an X grab on it
   */
  parent = GTK_WIDGET (menu);
  xgrab_shell = NULL;
  while (parent)
    {
      gboolean viewable = TRUE;
      GtkWidget *tmp = parent;
      
      while (tmp)
	{
	  if (!GTK_WIDGET_MAPPED (tmp))
	    {
	      viewable = FALSE;
	      break;
	    }
	  tmp = tmp->parent;
	}
      
      if (viewable)
	xgrab_shell = parent;
      
      parent = GTK_MENU_SHELL (parent)->parent_menu_shell;
    }
  
  if (xgrab_shell && (!GTK_MENU_SHELL (xgrab_shell)->have_xgrab))
    {
      GdkCursor *cursor = gdk_cursor_new (GDK_ARROW);

      if ((gdk_pointer_grab (xgrab_shell->window, TRUE,
			     GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
			     GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK |
			     GDK_POINTER_MOTION_MASK,
			     NULL, cursor, activate_time) == 0))
	{
	  if (gdk_keyboard_grab (xgrab_shell->window, TRUE,
			      activate_time) == 0)
	    GTK_MENU_SHELL (xgrab_shell)->have_xgrab = TRUE;
	  else
	    {
	      gdk_pointer_ungrab (activate_time);
	    }
	}

      gdk_cursor_destroy (cursor);
    }
  
  gtk_grab_add (GTK_WIDGET (menu));
}

void
gtk_menu_popdown (GtkMenu *menu)
{
  GtkMenuShell *menu_shell;
  
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  
  menu_shell = GTK_MENU_SHELL (menu);
  
  menu_shell->parent_menu_shell = NULL;
  menu_shell->active = FALSE;
  menu_shell->ignore_enter = FALSE;
  
  if (menu_shell->active_menu_item)
    {
      if (menu->old_active_menu_item)
	gtk_widget_unref (menu->old_active_menu_item);
      menu->old_active_menu_item = menu_shell->active_menu_item;
      gtk_widget_ref (menu->old_active_menu_item);
    }

  gtk_menu_shell_deselect (menu_shell);
  
  /* The X Grab, if present, will automatically be removed when we hide
   * the window */
  gtk_widget_hide (menu->toplevel);

  if (menu->torn_off)
    {
      if (GTK_BIN (menu->toplevel)->child) 
	{
	  gtk_menu_reparent (menu, menu->tearoff_window, FALSE);
	} 
      else
	{
	  /* We popped up the menu from the tearoff, so we need to 
	   * release the grab - we aren't actually hiding the menu.
	   */
	  if (menu_shell->have_xgrab)
	    {
	      gdk_pointer_ungrab (GDK_CURRENT_TIME);
	      gdk_keyboard_ungrab (GDK_CURRENT_TIME);
	    }
	}
    }
  else
    gtk_widget_hide (GTK_WIDGET (menu));
        
  menu_shell->have_xgrab = FALSE;
  gtk_grab_remove (GTK_WIDGET (menu));
}

GtkWidget*
gtk_menu_get_active (GtkMenu *menu)
{
  GtkWidget *child;
  GList *children;
  
  g_return_val_if_fail (menu != NULL, NULL);
  g_return_val_if_fail (GTK_IS_MENU (menu), NULL);
  
  if (!menu->old_active_menu_item)
    {
      child = NULL;
      children = GTK_MENU_SHELL (menu)->children;
      
      while (children)
	{
	  child = children->data;
	  children = children->next;
	  
	  if (GTK_BIN (child)->child)
	    break;
	  child = NULL;
	}
      
      menu->old_active_menu_item = child;
      if (menu->old_active_menu_item)
	gtk_widget_ref (menu->old_active_menu_item);
    }
  
  return menu->old_active_menu_item;
}

void
gtk_menu_set_active (GtkMenu *menu,
		     guint    index)
{
  GtkWidget *child;
  GList *tmp_list;
  
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  
  tmp_list = g_list_nth (GTK_MENU_SHELL (menu)->children, index);
  if (tmp_list)
    {
      child = tmp_list->data;
      if (GTK_BIN (child)->child)
	{
	  if (menu->old_active_menu_item)
	    gtk_widget_unref (menu->old_active_menu_item);
	  menu->old_active_menu_item = child;
	  gtk_widget_ref (menu->old_active_menu_item);
	}
    }
}

void
gtk_menu_set_accel_group (GtkMenu	*menu,
			  GtkAccelGroup *accel_group)
{
  g_return_if_fail (GTK_IS_MENU (menu));
  
  if (menu->accel_group != accel_group)
    {
      if (menu->accel_group)
	gtk_accel_group_unref (menu->accel_group);
      menu->accel_group = accel_group;
      if (menu->accel_group)
	gtk_accel_group_ref (menu->accel_group);
    }
}

GtkAccelGroup*
gtk_menu_get_accel_group (GtkMenu *menu)
{
  g_return_val_if_fail (GTK_IS_MENU (menu), NULL);

  return menu->accel_group;
}

GtkAccelGroup*
gtk_menu_ensure_uline_accel_group (GtkMenu *menu)
{
  GtkAccelGroup *accel_group;

  g_return_val_if_fail (GTK_IS_MENU (menu), NULL);

  if (!quark_uline_accel_group)
    quark_uline_accel_group = g_quark_from_static_string ("GtkMenu-uline-accel-group");

  accel_group = gtk_object_get_data_by_id (GTK_OBJECT (menu), quark_uline_accel_group);
  if (!accel_group)
    {
      accel_group = gtk_accel_group_new ();
      gtk_accel_group_attach (accel_group, GTK_OBJECT (menu));
      gtk_object_set_data_by_id_full (GTK_OBJECT (menu),
				      quark_uline_accel_group,
				      accel_group,
				      (GtkDestroyNotify) gtk_accel_group_unref);
    }

  return accel_group;
}

GtkAccelGroup*
gtk_menu_get_uline_accel_group (GtkMenu *menu)
{
  g_return_val_if_fail (GTK_IS_MENU (menu), NULL);

  return gtk_object_get_data_by_id (GTK_OBJECT (menu), quark_uline_accel_group);
}

void
gtk_menu_reposition (GtkMenu *menu)
{
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));

  if (GTK_WIDGET_DRAWABLE (menu) && !menu->torn_off)
    gtk_menu_position (menu);
}


void       
gtk_menu_set_tearoff_state (GtkMenu  *menu,
			    gboolean  torn_off)
{
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));

  if (menu->torn_off != torn_off)
    {
      menu->torn_off = torn_off;
      
      if (menu->torn_off)
	{
	  if (GTK_WIDGET_VISIBLE (menu))
	    gtk_menu_popdown (menu);

	  if (!menu->tearoff_window)
	    {
	      GtkWidget *attach_widget;
	      gchar *title;
	      
	      menu->tearoff_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	      gtk_widget_set_app_paintable (menu->tearoff_window, TRUE);
	      gtk_signal_connect (GTK_OBJECT (menu->tearoff_window),  
				  "event",
				  GTK_SIGNAL_FUNC (gtk_menu_window_event), 
				  GTK_OBJECT (menu));
	      gtk_widget_realize (menu->tearoff_window);
	      
	      title = gtk_object_get_data (GTK_OBJECT (menu), "gtk-menu-title");
	      if (!title)
		{
		  attach_widget = gtk_menu_get_attach_widget (menu);
		  if (GTK_IS_MENU_ITEM (attach_widget))
		    {
		      GtkWidget *child = GTK_BIN (attach_widget)->child;
		      if (GTK_IS_LABEL (child))
			gtk_label_get (GTK_LABEL (child), &title);
		    }
		}

	      if (title)
		gdk_window_set_title (menu->tearoff_window->window, title);

	      gdk_window_set_decorations (menu->tearoff_window->window, 
					  GDK_DECOR_ALL |
					  GDK_DECOR_RESIZEH |
					  GDK_DECOR_MINIMIZE |
					  GDK_DECOR_MAXIMIZE);
	      gtk_window_set_policy (GTK_WINDOW (menu->tearoff_window),
				     FALSE, FALSE, TRUE);
	    }
	  gtk_menu_reparent (menu, menu->tearoff_window, FALSE);

	  gtk_menu_position (menu);
	  
	  gtk_widget_show (GTK_WIDGET (menu));
	  gtk_widget_show (menu->tearoff_window);
	}
      else
	{
	  gtk_widget_hide (menu->tearoff_window);
	  gtk_menu_reparent (menu, menu->toplevel, FALSE);
	}
    }
}

void       
gtk_menu_set_title (GtkMenu     *menu,
		    const gchar *title)
{
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));

  gtk_object_set_data_full (GTK_OBJECT (menu), "gtk-menu-title",
			    g_strdup (title), (GtkDestroyNotify) g_free);
}

void
gtk_menu_reorder_child (GtkMenu   *menu,
                        GtkWidget *child,
                        gint       position)
{
  GtkMenuShell *menu_shell;
  g_return_if_fail (GTK_IS_MENU (menu));
  g_return_if_fail (GTK_IS_MENU_ITEM (child));
  menu_shell = GTK_MENU_SHELL (menu);
  if (g_list_find (menu_shell->children, child))
    {   
      menu_shell->children = g_list_remove (menu_shell->children, child);
      menu_shell->children = g_list_insert (menu_shell->children, child, position);   
      if (GTK_WIDGET_VISIBLE (menu_shell))
        gtk_widget_queue_resize (GTK_WIDGET (menu_shell));
    }   
}

static void
gtk_menu_realize (GtkWidget *widget)
{
  GdkWindowAttr attributes;
  gint attributes_mask;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  
  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
  
  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = widget->allocation.width;
  attributes.height = widget->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= (GDK_EXPOSURE_MASK | GDK_KEY_PRESS_MASK);
  
  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
  gdk_window_set_user_data (widget->window, widget);
  
  widget->style = gtk_style_attach (widget->style, widget->window);
  gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
  gtk_menu_paint(widget);
}

static void
gtk_menu_size_request (GtkWidget      *widget,
		       GtkRequisition *requisition)
{
  GtkMenu *menu;
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GList *children;
  guint max_toggle_size;
  guint max_accel_width;
  GtkRequisition child_requisition;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  g_return_if_fail (requisition != NULL);