gtklist.c

gtk是linux一款强大的夸平台的图形化开发工具

  if (gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list))
    {
      gtk_list_end_drag_selection (list);

      if (list->anchor != -1 && list->selection_mode == GTK_SELECTION_EXTENDED)
	gtk_list_end_selection (list);
    }

  gdk_window_hide (widget->window);
}

static gint
gtk_list_motion_notify (GtkWidget      *widget,
			GdkEventMotion *event)
{
  GtkList *list;
  GtkWidget *item = NULL;
  GtkAdjustment *adj;
  GtkContainer *container;
  GList *work;
  gint x;
  gint y;
  gint row = -1;
  gint focus_row = 0;
  gint length = 0;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_LIST (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  list = GTK_LIST (widget);

  if (!list->drag_selection || !list->children)
    return FALSE;

  container = GTK_CONTAINER (widget);

  if (event->is_hint || event->window != widget->window)
    gdk_window_get_pointer (widget->window, &x, &y, NULL);

  adj = gtk_object_get_data_by_id (GTK_OBJECT (list), hadjustment_key_id);

  /* horizontal autoscrolling */
  if (adj && widget->allocation.width > adj->page_size &&
      (x < adj->value || x >= adj->value + adj->page_size))
    {
      if (list->htimer == 0)
	{
	  list->htimer = gtk_timeout_add
	    (SCROLL_TIME, (GtkFunction) gtk_list_horizontal_timeout, widget);
	  
	  if (!((x < adj->value && adj->value <= 0) ||
		(x > adj->value + adj->page_size &&
		 adj->value >= adj->upper - adj->page_size)))
	    {
	      gfloat value;

	      if (x < adj->value)
		value = adj->value + (x - adj->value) / 2 - 1;
	      else
		value = adj->value + 1 + (x - adj->value - adj->page_size) / 2;

	      gtk_adjustment_set_value (adj,
					CLAMP (value, 0.0,
					       adj->upper - adj->page_size));
	    }
	}
      else
	return FALSE;
    }

  
  /* vertical autoscrolling */
  for (work = list->children; work; length++, work = work->next)
    {
      if (row < 0)
	{
	  item = GTK_WIDGET (work->data);
	  if (item->allocation.y > y || 
	      (item->allocation.y <= y &&
	       item->allocation.y + item->allocation.height > y))
	    row = length;
	}

      if (work->data == container->focus_child)
	focus_row = length;
    }
  
  if (row < 0)
    row = length - 1;

  if (list->vtimer != 0)
    return FALSE;

  if (!((y < 0 && focus_row == 0) ||
	(y > widget->allocation.height && focus_row >= length - 1)))
    list->vtimer = gtk_timeout_add (SCROLL_TIME,
				    (GtkFunction) gtk_list_vertical_timeout,
				    list);

  if (row != focus_row)
    gtk_widget_grab_focus (item);

  switch (list->selection_mode)
    {
    case GTK_SELECTION_BROWSE:
      gtk_list_select_child (list, item);
      break;
    case GTK_SELECTION_EXTENDED:
      gtk_list_update_extended_selection (list, row);
      break;
    default:
      break;
    }

  return FALSE;
}

static gint
gtk_list_button_press (GtkWidget      *widget,
		       GdkEventButton *event)
{
  GtkList *list;
  GtkWidget *item;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_LIST (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (event->button != 1)
    return FALSE;

  list = GTK_LIST (widget);
  item = gtk_get_event_widget ((GdkEvent*) event);

  while (item && !GTK_IS_LIST_ITEM (item))
    item = item->parent;

  if (item && (item->parent == widget))
    {
      gint last_focus_row;
      gint focus_row;

      if (event->type == GDK_BUTTON_PRESS)
	{
	  if (gdk_pointer_grab (widget->window, TRUE,
				GDK_POINTER_MOTION_HINT_MASK |
				GDK_BUTTON1_MOTION_MASK |
				GDK_BUTTON_RELEASE_MASK,
				NULL, NULL, event->time))
	    return FALSE;
	  
	  gtk_grab_add (widget);
	  list->drag_selection = TRUE;
	}
      else if (gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list))
	gtk_list_end_drag_selection (list);
	  
      if (!GTK_WIDGET_HAS_FOCUS(item))
	gtk_widget_grab_focus (item);

      if (list->add_mode)
	{
	  list->add_mode = FALSE;
	  gtk_widget_queue_draw (item);
	}
      
      switch (list->selection_mode)
	{
	case GTK_SELECTION_SINGLE:
	case GTK_SELECTION_MULTIPLE:
	  if (event->type != GDK_BUTTON_PRESS)
	    gtk_list_select_child (list, item);
	  else
	    list->undo_focus_child = item;
	  break;
	  
	case GTK_SELECTION_BROWSE:
	  break;

	case GTK_SELECTION_EXTENDED:
	  focus_row = g_list_index (list->children, item);

	  if (list->last_focus_child)
	    last_focus_row = g_list_index (list->children,
					   list->last_focus_child);
	  else
	    {
	      last_focus_row = focus_row;
	      list->last_focus_child = item;
	    }

	  if (event->type != GDK_BUTTON_PRESS)
	    {
	      if (list->anchor >= 0)
		{
		  gtk_list_update_extended_selection (list, focus_row);
		  gtk_list_end_selection (list);
		}
	      gtk_list_select_child (list, item);
	      break;
	    }
	      
	  if (event->state & GDK_CONTROL_MASK)
	    {
	      if (event->state & GDK_SHIFT_MASK)
		{
		  if (list->anchor < 0)
		    {
		      g_list_free (list->undo_selection);
		      g_list_free (list->undo_unselection);
		      list->undo_selection = NULL;
		      list->undo_unselection = NULL;

		      list->anchor = last_focus_row;
		      list->drag_pos = last_focus_row;
		      list->undo_focus_child = list->last_focus_child;
		    }
		  gtk_list_update_extended_selection (list, focus_row);
		}
	      else
		{
		  if (list->anchor < 0)
		    gtk_list_set_anchor (list, TRUE,
					 focus_row, list->last_focus_child);
		  else
		    gtk_list_update_extended_selection (list, focus_row);
		}
	      break;
	    }

	  if (event->state & GDK_SHIFT_MASK)
	    {
	      gtk_list_set_anchor (list, FALSE,
				   last_focus_row, list->last_focus_child);
	      gtk_list_update_extended_selection (list, focus_row);
	      break;
	    }

	  if (list->anchor < 0)
	    gtk_list_set_anchor (list, FALSE, focus_row,
				 list->last_focus_child);
	  else
	    gtk_list_update_extended_selection (list, focus_row);
	  break;
	  
	default:
	  break;
	}
    }

  return FALSE;
}

static gint
gtk_list_button_release (GtkWidget	*widget,
			 GdkEventButton *event)
{
  GtkList *list;
  GtkWidget *item;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_LIST (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  list = GTK_LIST (widget);

  /* we don't handle button 2 and 3 */
  if (event->button != 1)
    return FALSE;

  if (list->drag_selection)
    {
      gtk_list_end_drag_selection (list);

      switch (list->selection_mode)
	{
	case GTK_SELECTION_EXTENDED:
 	  if (!(event->state & GDK_SHIFT_MASK))
	    gtk_list_end_selection (list);
	  break;

	case GTK_SELECTION_SINGLE:
	case GTK_SELECTION_MULTIPLE:

	  item = gtk_get_event_widget ((GdkEvent*) event);
  
	  while (item && !GTK_IS_LIST_ITEM (item))
	    item = item->parent;
	  
	  if (item && item->parent == widget)
	    {
	      if (list->undo_focus_child == item)
		gtk_list_toggle_row (list, item);
	    }
	  list->undo_focus_child = NULL;
	  break;

	default:
	  break;
	}
    }
  
  return FALSE;
}

static void
gtk_list_draw (GtkWidget    *widget,
	       GdkRectangle *area)
{
  GtkList *list;
  GtkWidget *child;
  GdkRectangle child_area;
  GList *children;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LIST (widget));
  g_return_if_fail (area != NULL);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      list = GTK_LIST (widget);

      children = list->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_list_expose (GtkWidget	*widget,
		 GdkEventExpose *event)
{
  GtkList *list;
  GtkWidget *child;
  GdkEventExpose child_event;
  GList *children;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_LIST (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      list = GTK_LIST (widget);

      child_event = *event;

      children = list->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 void 
gtk_list_style_set	(GtkWidget      *widget,
			 GtkStyle       *previous_style)
{
  g_return_if_fail (widget != NULL);

  if (previous_style && GTK_WIDGET_REALIZED (widget))
    gdk_window_set_background (widget->window, &widget->style->base[GTK_WIDGET_STATE (widget)]);
}

/* GtkContainer Methods :
 * gtk_list_add
 * gtk_list_remove
 * gtk_list_forall
 * gtk_list_child_type
 * gtk_list_set_focus_child
 * gtk_list_focus
 */
static void
gtk_list_add (GtkContainer *container,
	      GtkWidget	   *widget)
{
  GList *item_list;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_LIST (container));
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LIST_ITEM (widget));

  item_list = g_list_alloc ();
  item_list->data = widget;
  
  gtk_list_append_items (GTK_LIST (container), item_list);
}

static void
gtk_list_remove (GtkContainer *container,
		 GtkWidget    *widget)
{
  GList *item_list;
  
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_LIST (container));
  g_return_if_fail (widget != NULL);
  g_return_if_fail (container == GTK_CONTAINER (widget->parent));
  
  item_list = g_list_alloc ();
  item_list->data = widget;
  
  gtk_list_remove_items (GTK_LIST (container), item_list);
  
  g_list_free (item_list);
}

static void
gtk_list_forall (GtkContainer  *container,
		 gboolean       include_internals,
		 GtkCallback	callback,
		 gpointer	callback_data)
{
  GtkList *list;
  GtkWidget *child;
  GList *children;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_LIST (container));
  g_return_if_fail (callback != NULL);

  list = GTK_LIST (container);
  children = list->children;

  while (children)
    {
      child = children->data;
      children = children->next;

      (* callback) (child, callback_data);
    }
}

static GtkType
gtk_list_child_type (GtkContainer *container)
{
  return GTK_TYPE_LIST_ITEM;
}

static void
gtk_list_set_focus_child (GtkContainer *container,
			  GtkWidget    *child)
{
  GtkList *list;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_LIST (container));
 
  if (child)
    g_return_if_fail (GTK_IS_WIDGET (child));

  list = GTK_LIST (container);

  if (child != container->focus_child)
    {
      if (container->focus_child)
	{
	  list->last_focus_child = container->focus_child;
	  gtk_widget_unref (container->focus_child);
	}
      container->focus_child = child;
      if (container->focus_child)
        gtk_widget_ref (container->focus_child);
    }

  /* check for v adjustment */
  if (container->focus_child)
    {
      GtkAdjustment *adjustment;

      adjustment = gtk_object_get_data_by_id (GTK_OBJECT (container),
					      vadjustment_key_id);
      if (adjustment)
        gtk_adjustment_clamp_page (adjustment,
                                   container->focus_child->allocation.y,
                                   (container->focus_child->allocation.y +
                                    container->focus_child->allocation.height));
      switch (list->selection_mode)
	{
	case GTK_SELECTION_BROWSE:
	  gtk_list_select_child (list, child);
	  break;
	case GTK_SELECTION_EXTENDED:
	  if (!list->last_focus_child && !list->add_mode)
	    {
	      list->undo_focus_child = list->last_focus_child;
	      gtk_list_unselect_all (list);
	      gtk_list_select_child (list, child);
	    }
	  break;
	default:
	  break;
	}
    }
}

static gint
gtk_list_focus (GtkContainer     *container,
		GtkDirectionType  direction)
{
  gint return_val = FALSE;

  g_return_val_if_fail (container != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_LIST (container), FALSE);

  if (container->focus_child == NULL ||
      !GTK_WIDGET_HAS_FOCUS (container->focus_child))
    {