gtkmenu.c

gtk是linux一款强大的夸平台的图形化开发工具

  menu = GTK_MENU (widget);
  menu_shell = GTK_MENU_SHELL (widget);
  
  requisition->width = 0;
  requisition->height = 0;
  
  max_toggle_size = 0;
  max_accel_width = 0;
  
  children = menu_shell->children;
  while (children)
    {
      child = children->data;
      children = children->next;
      
      if (GTK_WIDGET_VISIBLE (child))
	{
	  GTK_MENU_ITEM (child)->show_submenu_indicator = TRUE;
	  gtk_widget_size_request (child, &child_requisition);
	  
	  requisition->width = MAX (requisition->width, child_requisition.width);
	  requisition->height += child_requisition.height;
	  
	  max_toggle_size = MAX (max_toggle_size, MENU_ITEM_CLASS (child)->toggle_size);
	  max_accel_width = MAX (max_accel_width, GTK_MENU_ITEM (child)->accelerator_width);
	}
    }
  
  requisition->width += max_toggle_size + max_accel_width;
  requisition->width += (GTK_CONTAINER (menu)->border_width +
			 widget->style->klass->xthickness) * 2;
  requisition->height += (GTK_CONTAINER (menu)->border_width +
			  widget->style->klass->ythickness) * 2;
  
  children = menu_shell->children;
  while (children)
    {
      child = children->data;
      children = children->next;
      
      GTK_MENU_ITEM (child)->toggle_size = max_toggle_size;
    }
}

static void
gtk_menu_size_allocate (GtkWidget     *widget,
			GtkAllocation *allocation)
{
  GtkMenu *menu;
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GtkAllocation child_allocation;
  GList *children;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  g_return_if_fail (allocation != NULL);
  
  menu = GTK_MENU (widget);
  menu_shell = GTK_MENU_SHELL (widget);
  
  widget->allocation = *allocation;
  if (GTK_WIDGET_REALIZED (widget))
    gdk_window_move_resize (widget->window,
			    allocation->x, allocation->y,
			    allocation->width, allocation->height);


  if (menu_shell->children)
    {
      child_allocation.x = (GTK_CONTAINER (menu)->border_width +
			    widget->style->klass->xthickness);
      child_allocation.y = (GTK_CONTAINER (menu)->border_width +
			    widget->style->klass->ythickness);
      child_allocation.width = MAX (1, (gint)allocation->width - child_allocation.x * 2);
      
      children = menu_shell->children;
      while (children)
	{
	  child = children->data;
	  children = children->next;
	  
	  if (GTK_WIDGET_VISIBLE (child))
	    {
	      GtkRequisition child_requisition;
	      gtk_widget_get_child_requisition (child, &child_requisition);
	      
	      child_allocation.height = child_requisition.height;
	      
	      gtk_widget_size_allocate (child, &child_allocation);
	      gtk_widget_queue_draw (child);
	      
	      child_allocation.y += child_allocation.height;
	    }
	}
    }
}

static void
gtk_menu_paint (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  
  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gtk_paint_box (widget->style,
		     widget->window,
		     GTK_STATE_NORMAL,
		     GTK_SHADOW_OUT,
		     NULL, widget, "menu",
		     0, 0, -1, -1);
    }
}

static void
gtk_menu_draw (GtkWidget    *widget,
	       GdkRectangle *area)
{
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GdkRectangle child_area;
  GList *children;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  g_return_if_fail (area != NULL);
  
  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gtk_menu_paint (widget);
      
      menu_shell = GTK_MENU_SHELL (widget);
      
      children = menu_shell->children;
      while (children)
	{
	  child = children->data;
	  children = children->next;
	  
	  if (gtk_widget_intersect (child, area, &child_area))
	    gtk_widget_draw (child, &child_area);
	}
    }
}

static gint
gtk_menu_expose (GtkWidget	*widget,
		 GdkEventExpose *event)
{
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GdkEventExpose child_event;
  GList *children;
  GtkMenu *menu;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  menu_shell = GTK_MENU_SHELL (widget);
  menu = GTK_MENU (widget);
  
  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gtk_menu_paint (widget);
      
      child_event = *event;
      
      children = menu_shell->children;
      while (children)
	{
	  child = children->data;
	  children = children->next;
	  
	  if (GTK_WIDGET_NO_WINDOW (child) &&
	      gtk_widget_intersect (child, &event->area, &child_event.area))
	    gtk_widget_event (child, (GdkEvent*) &child_event);
	}
    }
  
  return FALSE;
}

static gint
gtk_menu_key_press (GtkWidget	*widget,
		    GdkEventKey *event)
{
  GtkMenuShell *menu_shell;
  gboolean delete = FALSE;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
      
  menu_shell = GTK_MENU_SHELL (widget);

  if (GTK_WIDGET_CLASS (parent_class)->key_press_event (widget, event))
    return TRUE;

  switch (event->keyval)
    {
    case GDK_Delete:
    case GDK_KP_Delete:
    case GDK_BackSpace:
      delete = TRUE;
      break;
    default:
      break;
    }

  /* Modify the accelerators */
  if (menu_shell->active_menu_item &&
      GTK_BIN (menu_shell->active_menu_item)->child &&
      GTK_MENU_ITEM (menu_shell->active_menu_item)->submenu == NULL &&
      !gtk_widget_accelerators_locked (menu_shell->active_menu_item) &&
      (delete ||
       (gtk_accelerator_valid (event->keyval, event->state) &&
	(event->state ||
	 !gtk_menu_get_uline_accel_group (GTK_MENU (menu_shell)) ||
	 (event->keyval >= GDK_F1 && event->keyval <= GDK_F35)))))
    {
      GtkMenuItem *menu_item;
      GtkAccelGroup *accel_group;
      
      menu_item = GTK_MENU_ITEM (menu_shell->active_menu_item);
      
      if (!GTK_MENU (widget)->accel_group)
	accel_group = gtk_accel_group_get_default ();
      else
	accel_group = GTK_MENU (widget)->accel_group;
      
      gtk_widget_remove_accelerators (GTK_WIDGET (menu_item),
				      gtk_signal_name (menu_item->accelerator_signal),
				      TRUE);
      
      if (!delete &&
	  0 == gtk_widget_accelerator_signal (GTK_WIDGET (menu_item),
					      accel_group,
					      event->keyval,
					      event->state))
	{
	  GSList *slist;
	  
	  slist = gtk_accel_group_entries_from_object (GTK_OBJECT (menu_item));
	  while (slist)
	    {
	      GtkAccelEntry *ac_entry;
	      
	      ac_entry = slist->data;
	      
	      if (ac_entry->signal_id == menu_item->accelerator_signal)
		break;
	      
	      slist = slist->next;
	    }
	  
	  if (!slist)
	    gtk_widget_add_accelerator (GTK_WIDGET (menu_item),
					gtk_signal_name (menu_item->accelerator_signal),
					accel_group,
					event->keyval,
					event->state,
					GTK_ACCEL_VISIBLE);
	}
    }
  
  return TRUE;
}

static gint 
gtk_menu_motion_notify  (GtkWidget	   *widget,
			 GdkEventMotion    *event)
{
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU (widget), FALSE);
  
  if (GTK_MENU_SHELL (widget)->ignore_enter)
    GTK_MENU_SHELL (widget)->ignore_enter = FALSE;
  else 
    {
      gint width, height;

      gdk_window_get_size (event->window, &width, &height);
      if (event->x >= 0 && event->x < width &&
	  event->y >= 0 && event->y < height)
	{
	  GdkEvent send_event;
	  
	  send_event.crossing.type = GDK_ENTER_NOTIFY;
	  send_event.crossing.window = event->window;
	  send_event.crossing.time = event->time;
	  send_event.crossing.send_event = TRUE;
	  
	  gtk_widget_event (widget, &send_event);
	}
    }

  return FALSE;
}

static void
gtk_menu_deactivate (GtkMenuShell *menu_shell)
{
  GtkWidget *parent;
  
  g_return_if_fail (menu_shell != NULL);
  g_return_if_fail (GTK_IS_MENU (menu_shell));
  
  parent = menu_shell->parent_menu_shell;
  
  menu_shell->activate_time = 0;
  gtk_menu_popdown (GTK_MENU (menu_shell));
  
  if (parent)
    gtk_menu_shell_deactivate (GTK_MENU_SHELL (parent));
}


static void
gtk_menu_position (GtkMenu *menu)
{
  GtkWidget *widget;
  GtkRequisition requisition;
  gint x, y;
 
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));

  widget = GTK_WIDGET (menu);

  gdk_window_get_pointer (NULL, &x, &y, NULL);

  /* We need the requisition to figure out the right place to
   * popup the menu. In fact, we always need to ask here, since
   * if one a size_request was queued while we weren't popped up,
   * the requisition won't have been recomputed yet.
   */
  gtk_widget_size_request (widget, &requisition);
      
  if (menu->position_func)
    (* menu->position_func) (menu, &x, &y, menu->position_func_data);
  else
    {
      gint screen_width;
      gint screen_height;
      
      screen_width = gdk_screen_width ();
      screen_height = gdk_screen_height ();
	  
      x = CLAMP (x - 2, 0, MAX (0, screen_width - requisition.width));
      y = CLAMP (y - 2, 0, MAX (0, screen_height - requisition.height));
    }

  /* FIXME: The MAX() here is because gtk_widget_set_uposition
   * is broken. Once we provide an alternate interface that
   * allows negative values, then we can remove them.
   */
  gtk_widget_set_uposition (GTK_MENU_SHELL (menu)->active ?
			        menu->toplevel : menu->tearoff_window, 
			    MAX (x, 0), MAX (y, 0));
}

/* Reparent the menu, taking care of the refcounting
 */
static void 
gtk_menu_reparent (GtkMenu      *menu, 
		   GtkWidget    *new_parent, 
		   gboolean      unrealize)
{
  GtkObject *object = GTK_OBJECT (menu);
  GtkWidget *widget = GTK_WIDGET (menu);
  gboolean was_floating = GTK_OBJECT_FLOATING (object);

  gtk_object_ref (object);
  gtk_object_sink (object);

  if (unrealize)
    {
      gtk_object_ref (object);
      gtk_container_remove (GTK_CONTAINER (widget->parent), widget);
      gtk_container_add (GTK_CONTAINER (new_parent), widget);
      gtk_object_unref (object);
    }
  else
    gtk_widget_reparent (GTK_WIDGET (menu), new_parent);
  gtk_widget_set_usize (new_parent, -1, -1);
  
  if (was_floating)
    GTK_OBJECT_SET_FLAGS (object, GTK_FLOATING);
  else
    gtk_object_unref (object);
}

static void
gtk_menu_show_all (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));

  /* Show children, but not self. */
  gtk_container_foreach (GTK_CONTAINER (widget), (GtkCallback) gtk_widget_show_all, NULL);
}


static void
gtk_menu_hide_all (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));

  /* Hide children, but not self. */
  gtk_container_foreach (GTK_CONTAINER (widget), (GtkCallback) gtk_widget_hide_all, NULL);
}