+ if (_y_position <= y && y < (_y_position + height)) {
+
+ /* work out the layer index if appropriate */
+ layer_t l = 0;
+ if (layer_display () == Stacked && view ()) {
+ /* compute layer */
+ l = layer_t ((_y_position + height - y) / (view()->child_height ()));
+ /* clamp to max layers to be on the safe side; sometimes the above calculation
+ returns a too-high value */
+ if (l >= view()->layers ()) {
+ l = view()->layers() - 1;
+ }
+ }
+
+ return std::make_pair (this, l);