Method getNearestCommonAncestor

dw/widget.cc:1629–1657

* \brief Get the widget with the highest level, which is a direct ancestor of * widget1 and widget2. */

 *    widget1 and widget2.
 */
Widget *Widget::getNearestCommonAncestor (Widget *otherWidget)
{
   Widget *widget1 = this, *widget2 = otherWidget;
   int level1 = widget1->getLevel (), level2 = widget2->getLevel();

   /* Get both widgets onto the same level.*/
   while (level1 > level2) {
      widget1 = widget1->parent;
      level1--;
   }

   while (level2 > level1) {
      widget2 = widget2->parent;
      level2--;
   }

   /* Search upwards. */
   while (widget1 != widget2) {
      if (widget1->parent == NULL) {
         MSG_WARN("widgets in different trees\n");
         return NULL;
      }

      widget1 = widget1->parent;
      widget2 = widget2->parent;
   }

   return widget1;
}

void Widget::scrollTo (HPosition hpos, VPosition vpos,
               int x, int y, int width, int height)