gtklist.c

gtk是linux一款强大的夸平台的图形化开发工具

  if (item->state == GTK_STATE_NORMAL)
    {
      list->anchor_state = GTK_STATE_SELECTED;
      gtk_widget_set_state (item, GTK_STATE_SELECTED);
    }
  else
    {
      list->anchor_state = GTK_STATE_NORMAL;
      gtk_widget_set_state (item, GTK_STATE_NORMAL);
    }
}

static void
gtk_list_update_extended_selection (GtkList *list,
				    gint     row)
{
  gint i;
  GList *work;
  gint s1 = -1;
  gint s2 = -1;
  gint e1 = -1;
  gint e2 = -1;
  gint length;

  if (row < 0)
    row = 0;

  length = g_list_length (list->children);
  if (row >= length)
    row = length - 1;

  if (list->selection_mode != GTK_SELECTION_EXTENDED || !list->anchor < 0)
    return;

  /* extending downwards */
  if (row > list->drag_pos && list->anchor <= list->drag_pos)
    {
      s2 = list->drag_pos + 1;
      e2 = row;
    }
  /* extending upwards */
  else if (row < list->drag_pos && list->anchor >= list->drag_pos)
    {
      s2 = row;
      e2 = list->drag_pos - 1;
    }
  else if (row < list->drag_pos && list->anchor < list->drag_pos)
    {
      e1 = list->drag_pos;
      /* row and drag_pos on different sides of anchor :
	 take back the selection between anchor and drag_pos,
         select between anchor and row */
      if (row < list->anchor)
	{
	  s1 = list->anchor + 1;
	  s2 = row;
	  e2 = list->anchor - 1;
	}
      /* take back the selection between anchor and drag_pos */
      else
	s1 = row + 1;
    }
  else if (row > list->drag_pos && list->anchor > list->drag_pos)
    {
      s1 = list->drag_pos;
      /* row and drag_pos on different sides of anchor :
	 take back the selection between anchor and drag_pos,
         select between anchor and row */
      if (row > list->anchor)
	{
	  e1 = list->anchor - 1;
	  s2 = list->anchor + 1;
	  e2 = row;
	}
      /* take back the selection between anchor and drag_pos */
      else
	e1 = row - 1;
    }

  list->drag_pos = row;

  /* restore the elements between s1 and e1 */
  if (s1 >= 0)
    {
      for (i = s1, work = g_list_nth (list->children, i); i <= e1;
	   i++, work = work->next)
	{
	  if (g_list_find (list->selection, work->data))
            gtk_widget_set_state (GTK_WIDGET (work->data), GTK_STATE_SELECTED);
          else
            gtk_widget_set_state (GTK_WIDGET (work->data), GTK_STATE_NORMAL);
	}
    }

  /* extend the selection between s2 and e2 */
  if (s2 >= 0)
    {
      for (i = s2, work = g_list_nth (list->children, i); i <= e2;
	   i++, work = work->next)
	if (GTK_WIDGET (work->data)->state != list->anchor_state)
	  gtk_widget_set_state (GTK_WIDGET (work->data), list->anchor_state);
    }
}

static void
gtk_list_reset_extended_selection (GtkList *list)
{ 
  g_return_if_fail (list != 0);
  g_return_if_fail (GTK_IS_LIST (list));

  g_list_free (list->undo_selection);
  g_list_free (list->undo_unselection);
  list->undo_selection = NULL;
  list->undo_unselection = NULL;

  list->anchor = -1;
  list->drag_pos = -1;
  list->undo_focus_child = GTK_CONTAINER (list)->focus_child;
}

/* Public GtkList Scroll Methods :
 *
 * gtk_list_scroll_horizontal
 * gtk_list_scroll_vertical
 */
void
gtk_list_scroll_horizontal (GtkList       *list,
			    GtkScrollType  scroll_type,
			    gfloat         position)
{
  GtkAdjustment *adj;

  g_return_if_fail (list != 0);
  g_return_if_fail (GTK_IS_LIST (list));

  if (gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list))
    return;

  if (!(adj =
	gtk_object_get_data_by_id (GTK_OBJECT (list), hadjustment_key_id)))
    return;

  switch (scroll_type)
    {
    case GTK_SCROLL_STEP_BACKWARD:
      adj->value = CLAMP (adj->value - adj->step_increment, adj->lower,
			  adj->upper - adj->page_size);
      break;
    case GTK_SCROLL_STEP_FORWARD:
      adj->value = CLAMP (adj->value + adj->step_increment, adj->lower,
			  adj->upper - adj->page_size);
      break;
    case GTK_SCROLL_PAGE_BACKWARD:
      adj->value = CLAMP (adj->value - adj->page_increment, adj->lower,
			  adj->upper - adj->page_size);
      break;
    case GTK_SCROLL_PAGE_FORWARD:
      adj->value = CLAMP (adj->value + adj->page_increment, adj->lower,
			  adj->upper - adj->page_size);
      break;
    case GTK_SCROLL_JUMP:
      adj->value = CLAMP (adj->lower + (adj->upper - adj->lower) * position,
			  adj->lower, adj->upper - adj->page_size);
      break;
    default:
      break;
    }
  gtk_adjustment_value_changed (adj);
}

void
gtk_list_scroll_vertical (GtkList       *list,
			  GtkScrollType  scroll_type,
			  gfloat         position)
{
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  if (gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list))
    return;

  if (list->selection_mode == GTK_SELECTION_EXTENDED)
    {
      GtkContainer *container;

      if (list->anchor >= 0)
	return;

      container = GTK_CONTAINER (list);
      list->undo_focus_child = container->focus_child;
      gtk_list_move_focus_child (list, scroll_type, position);
      if (container->focus_child != list->undo_focus_child && !list->add_mode)
	{
	  gtk_list_unselect_all (list);
	  gtk_list_select_child (list, container->focus_child);
	}
    }
  else
    gtk_list_move_focus_child (list, scroll_type, position);
}


/* Private GtkList Scroll/Focus Functions :
 *
 * gtk_list_move_focus_child
 * gtk_list_horizontal_timeout
 * gtk_list_vertical_timeout
 */
static void
gtk_list_move_focus_child (GtkList       *list,
			   GtkScrollType  scroll_type,
			   gfloat         position)
{
  GtkContainer *container;
  GList *work;
  GtkWidget *item;
  GtkAdjustment *adj;
  gint new_value;

  g_return_if_fail (list != 0);
  g_return_if_fail (GTK_IS_LIST (list));

  container = GTK_CONTAINER (list);

  if (container->focus_child)
    work = g_list_find (list->children, container->focus_child);
  else
    work = list->children;

  if (!work)
    return;

  switch (scroll_type)
    {
    case GTK_SCROLL_STEP_BACKWARD:
      work = work->prev;
      if (work)
	gtk_widget_grab_focus (GTK_WIDGET (work->data));
      break;
    case GTK_SCROLL_STEP_FORWARD:
      work = work->next;
      if (work)
	gtk_widget_grab_focus (GTK_WIDGET (work->data));
      break;
    case GTK_SCROLL_PAGE_BACKWARD:
      if (!work->prev)
	return;

      item = work->data;
      adj = gtk_object_get_data_by_id (GTK_OBJECT (list), vadjustment_key_id);

      if (adj)
	{
	  gboolean correct = FALSE;

	  new_value = adj->value;

	  if (item->allocation.y <= adj->value)
	    {
	      new_value = MAX (item->allocation.y + item->allocation.height
			       - adj->page_size, adj->lower);
	      correct = TRUE;
	    }

	  if (item->allocation.y > new_value)
	    for (; work; work = work->prev)
	      {
		item = GTK_WIDGET (work->data);
		if (item->allocation.y <= new_value &&
		    item->allocation.y + item->allocation.height > new_value)
		  break;
	      }
	  else
	    for (; work; work = work->next)
	      {
		item = GTK_WIDGET (work->data);
		if (item->allocation.y <= new_value &&
		    item->allocation.y + item->allocation.height > new_value)
		  break;
	      }

	  if (correct && work && work->next && item->allocation.y < new_value)
	    item = work->next->data;
	}
      else
	item = list->children->data;
	  
      gtk_widget_grab_focus (item);
      break;
    case GTK_SCROLL_PAGE_FORWARD:
      if (!work->next)
	return;

      item = work->data;
      adj = gtk_object_get_data_by_id (GTK_OBJECT (list), vadjustment_key_id);

      if (adj)
	{
	  gboolean correct = FALSE;

	  new_value = adj->value;

	  if (item->allocation.y + item->allocation.height >=
	      adj->value + adj->page_size)
	    {
	      new_value = item->allocation.y;
	      correct = TRUE;
	    }

	  new_value = MIN (new_value + adj->page_size, adj->upper);

	  if (item->allocation.y > new_value)
	    for (; work; work = work->prev)
	      {
		item = GTK_WIDGET (work->data);
		if (item->allocation.y <= new_value &&
		    item->allocation.y + item->allocation.height > new_value)
		  break;
	      }
	  else
	    for (; work; work = work->next)
	      {
		item = GTK_WIDGET (work->data);
		if (item->allocation.y <= new_value &&
		    item->allocation.y + item->allocation.height > new_value)
		  break;
	      }

	  if (correct && work && work->prev &&
	      item->allocation.y + item->allocation.height - 1 > new_value)
	    item = work->prev->data;
	}
      else
	item = g_list_last (work)->data;
	  
      gtk_widget_grab_focus (item);
      break;
    case GTK_SCROLL_JUMP:
      new_value = GTK_WIDGET(list)->allocation.height * CLAMP (position, 0, 1);

      for (item = NULL, work = list->children; work; work =work->next)
	{
	  item = GTK_WIDGET (work->data);
	  if (item->allocation.y <= new_value &&
	      item->allocation.y + item->allocation.height > new_value)
	    break;
	}

      gtk_widget_grab_focus (item);
      break;
    default:
      break;
    }
}

static gint
gtk_list_horizontal_timeout (GtkWidget *list)
{
  GdkEventMotion event = { 0 };

  GDK_THREADS_ENTER ();

  GTK_LIST (list)->htimer = 0;

  event.type = GDK_MOTION_NOTIFY;
  event.send_event = TRUE;

  gtk_list_motion_notify (list, &event);

  GDK_THREADS_LEAVE ();

  return FALSE;
}

static gint
gtk_list_vertical_timeout (GtkWidget *list)
{
  GdkEventMotion event = { 0 };

  GDK_THREADS_ENTER ();

  GTK_LIST (list)->vtimer = 0;

  event.type = GDK_MOTION_NOTIFY;
  event.send_event = TRUE;

  gtk_list_motion_notify (list, &event);

  GDK_THREADS_LEAVE ();

  return FALSE;
}


/* Private GtkListItem Signal Functions :
 *
 * gtk_list_signal_toggle_focus_row
 * gtk_list_signal_select_all
 * gtk_list_signal_unselect_all
 * gtk_list_signal_undo_selection
 * gtk_list_signal_start_selection
 * gtk_list_signal_end_selection
 * gtk_list_signal_extend_selection
 * gtk_list_signal_scroll_horizontal
 * gtk_list_signal_scroll_vertical
 * gtk_list_signal_toggle_add_mode
 * gtk_list_signal_item_select
 * gtk_list_signal_item_deselect
 * gtk_list_signal_item_toggle
 */
static void
gtk_list_signal_toggle_focus_row (GtkListItem *list_item,
				  GtkList     *list)
{
  g_return_if_fail (list_item != 0);
  g_return_if_fail (GTK_IS_LIST_ITEM (list_item));
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  gtk_list_toggle_focus_row (list);
}

static void
gtk_list_signal_select_all (GtkListItem *list_item,
			    GtkList     *list)
{
  g_return_if_fail (list_item != 0);
  g_return_if_fail (GTK_IS_LIST_ITEM (list_item));
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  gtk_list_select_all (list);
}

static void
gtk_list_signal_unselect_all (GtkListItem *list_item,
			      GtkList     *list)
{
  g_return_if_fail (list_item != 0);
  g_return_if_fail (GTK_IS_LIST_ITEM (list_item));
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  gtk_list_unselect_all (list);
}

static void
gtk_list_signal_undo_selection (GtkListItem *list_item,
				GtkList     *list)
{
  g_return_if_fail (list_item != 0);
  g_return_if_fail (GTK_IS_LIST_ITEM (list_item));
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  gtk_list_undo_selection (list);
}

static void
gtk_list_signal_start_selection (GtkListItem *list_item,
				 GtkList     *list)
{
  g_return_if_fail (list_item != 0);
  g_return_if_fail (GTK_IS_LIST_ITEM (list_item));
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  gtk_list_start_selection (list);
}

static void
gtk_list_signal_end_selection (GtkListItem *list_item,
			       GtkList     *list)
{
  g_return_if_fail (list_item != 0);
  g_return_if_fail (GTK_IS_LIST_ITEM (list_item));
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  gtk_list_end_selection (list);
}

static void
gtk_list_signal_extend_selection (GtkListItem   *list_item,
				  GtkScrollType  scroll_type,
				  gfloat         position,
				  gboolean       auto_start_selection,
				  GtkList       *list)
{
  g_return_if_fail (list_item != 0);
  g_return_if_fail (GTK_IS_LIST_ITEM (list_item));
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  gtk_list_extend_selection (list, scroll_type, position,
			     auto_start_selection);
}

static void
gtk_list_signal_scroll_horizontal (GtkListItem   *list_item,
				   GtkScrollType  scroll_type,
				   gfloat         position,
				   GtkList       *list)
{
  g_return_if_fail (list_item != 0);
  g_return_if_fail (GTK_IS_LIST_ITEM (list_item));
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  gtk_list_scroll_horizontal (list, scroll_type, position);
}

static void
gtk_list_signal_scroll_vertical (GtkListItem   *list_item,
				 GtkScrollType  scroll_type,
				 gfloat         position,
				 GtkList       *list)
{
  g_return_if_fail (list_item != 0);
  g_return_if_fail (GTK_IS_LIST_ITEM (list_item));
  g_return_if_fail (list != NULL);